Fabrication of Automatic Guided Vehicle

AXIS COLLEGE OF ENGINEERING & TECHNOLOGY
Murikkingal P.O, Thrissur
(Affiliated to University of Calicut)
DEPARTMENT OF MECHANICAL ENGINEERING
MINI PROJECT REPORT
FABRICATION OF AUTOMATIC
GUIDED VEHICLE
AJITH ARAVIND
JESBIN JOHNSON
VINOD.K.J
VISHNU.T.SAJEEVAN

AXIS COLLEGE OF ENGINEERING & TECHNOLOGY
P.O.MURIKKINGAL, THRISSUR
DEPARTMENT OF MECHANICAL ENGINEERING
CERTIFICATE
This is to certify that this Project Report Titled
FABRICATION OF AUTOMATIC GUIDED VEHICLE
was carried out by the sixth semester students of Mechanical engineering in
partial fulfilment of the requirement for the award of Bachelor in Technology in
mechanical engineering Under University of Calicut during the year 2012-2013,of
Axis College of Engineering & Technology, Thrissur
AJITH ARAVIND, JESBIN JOHNSON, VINOD.K.J,
VISHNU.T.SAJEEVAN
are members of the batch
Project Guide
Joffin Jose P S.Krishnanunni
Project Coordinator H.O.D Mechanical Engg
Place: Thrissur
Date:

Fabrication of Automatic Guided Vehicle
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Department of Mechanical Engineering ACET
ACKNOWLEDGEMENT
We express our deep sense of gratitude and indebtedness to Asst Prof. S.Krishnanunni, Head,
Department of Mechanical Engineering for his valuable advice, constant encouragement and
constructive criticism during the course of the project and also during the preparation of this
manuscript, We place on record the valuable suggestions and numerous constructive
comments rendered by Asst Prof. Joffin Jose.P, Lecturer, Department of Mechanical
Engineering and for being our internal guide in the design and implementation of our project.
We are highly indebted to the staff members of Mechanical Department, especially
Asst.Professors Clint.K.S, Krishnakiran.T.T, Jineesh.V.V, Sankar Raj, Renjith for their
wholehearted support and co-operation.
We also express our sincere thanks to all the classmates for their support and co-
operation in completing the project work.
Above all, we should express our supreme gratitude to almighty God.

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ABSTRACT
The Automatic Guided Vehicle refers a type of system that can be used in production as well
as in other industries etc. This system includes a battery operated remote sensing locomotive
(carrier) on which a small lift is provided, specific path over which it moves, sensors for
sensing the the obstructions on the path of the carrier. Also sensors for sensing exact
positions from where load wants to carry and to where.
The remote sensing carrier moves using the electric power from the battery. It moves
with a low and constant speed on the prescribed path. The path has a specific color. The
bottom of the carrier have sensor which is always coupled with the path. From the remote
station we send only information for moving the carrier, not for steering it. The steering is
done by the path. The front side of carrier vehicle contains sensors for sensing the
obstructions on the path.
As it reaches the collecting station, its top floor lift to a small distance and lift the
stand which contains the parts wants to assemble, supply. And the carrier moves through the
path and reaches the supply station. The sensor provided on the carrier detected the station
and unload the stand contains assembly parts at that station. And move to collecting stations
again. Continues working cycles for making this project a reality.

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TABLE OF CONTENT
CHAPTER TITLE PAGE
CHAPTER I: INTRODUCTION
1.1 Automatic Guided Vehicle 1
1.2 Background 3
1.3 Problem Statement 3
1.4 Project and It’s Scope 5
1.5 Market Survey 6
CHAPTER II: LITERATURE REVIEW 7
2.1 AGV Built Worldwide Used 10
2.2 Mobile Post Distribution System (MOPS) 11
2.3 The Parkshuttle AGVs of Amsterdam’s Schiphol Airport 12
2.4 Line Following Robot 13
2.5 The Kerwin’s Line Following Robot 13
CHAPTER III: COMPONENTS SELECTION AND DESCRIPTION 14
3.1 Design Objectives 14
3.2 Design Considerations 15
3.3 Components of AGV 17
3.4 Mechanical Part 19
3.4.1 Chassis 19
3.4.2 Steering System 20
3.4.3 Lifting Mechanism 22
3.5 Electrical Components 24
3.5.1 DC Motor 24
3.5.2 Battery 25
3.6 Electronics Components 26
3.6.1 Microcontroller 26
3.6.2 Motor Driver 29

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3.6.3 Regulators 33
3.6.3.1 7805 Regulator 33
3.6.3.2 LM317 Regulator 34
3.6.4 IR Sensor 35
3.6.5 Magnetic Sensor 38
3.6.6 Display Unit 40
3.7 Software Components 42
3.8 Program Source Code 43
CHAPTER IV: DEVELOPED PROTOTYPE 50
4.1 Structure 50
4.2 Sensors Positions 52
4.3 Flow Chart 54
4.4 Block Diagram 55
4.5 Circuit Diagram 56
4.6 Theoretical and Logical Calculations 58
4.7 Billing 61
CHAPTER V: CONCLUSION 62
REFERENCES 64

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LIST OF TABLES
Table Number Title Page
2.1 Line Following Methods 13
3.1 Technical Data for Chassis 19
3.2 Steering Specifications 21
3.3 Motor Specifications 24
3.4 Battery Specifications 25
3.5 Specifications of ATmega 328 27
3.6 Important Connections 27
3.7 Technical Specifications of L293D 32
3.8 Maximum Rating of 7805 33
3.9 Technical Specifications of 7805 34
3.10 Technical Specifications of LM 317 34
3.11 Technical Specifications of IR Pair 37
3.12 Technical Specifications of Magnetic Sensors 39
3.13 Technical Specifications of Display Unit 40
3.14 Pin Configuration 40
4.1 Billing Table 61
LIST OF FIGURES
Figure Number Title Page
2.1 The Mobile Post System 11
2.2 The Parkshuttle AGV’s of Amsterdam 12
2.3 The Kerwin’s Line Following Robot 13
3.1 Chassis of AGV 19
3.2 Differential Steering 20
3.3 Small Radius Turning 21
3.4 Lifting Using Threaded Shaft 22
3.5 Structure of Lift 23
3.6 DC Motor with Gearbox 24
3.7 Battery 25
3.8 ATmega 328 Microcontroller 28

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Figure Number Title Page
3.9 Motor Driver (L293D) 29
3.10 L293D Connected with Two Motors 30
3.11 L293D Connected with One Motor 30
3.12 Circuit Connection of Driving Motor 31
3.13 Connection of Lifting Motor 31
3.14 PWM 32
3.15 7805 Regulator 33
3.16 LM 317 Circuit 34
3.17 IR for Path Detection 35
3.18 IR Pair Circuit 36
3.19 Magnetic Sensor 39
3.20 Application Circuit of Display Unit 41
4.1 Front View of AGV 50
4.2 Top View of AGV 51
4.3 IR Sensor Positions of AGV 52
4.4 Magnetic Sensor Positions 53
4.5 Flow Chart 54
4.6 Block Diagram 55
4.7 Circuit Diagram 56
4.8 Fully Developed Prototype 57

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CHAPTER I
INTRODUCTION
1.1 AUTOMATED GUIDED VEHICLE
An automated guided vehicle or automatic guided vehicle (AGV) is a mobile robot that
follows markers or wires in the floor, or uses vision or lasers. They are most often used in
industrial applications to move materials around a manufacturing facility or a warehouse
Automated guided vehicles increase efficiency and reduce costs by helping to
automate a manufacturing facility or warehouse. The AGV can tow objects behind them in
trailers to which they can autonomously attach. The trailers can be used to move raw
materials or finished product. The AGV can also store objects on a bed. The objects can be
placed on a set of conveyor and then pushed off by reversing them. Some AGVs use forklifts
to lift objects for storage. AGVs are employed in nearly every industry, including, pulp,
paper, metals, newspaper, and general manufacturing. Transporting materials such as food,
linen or medicine in hospitals is also done.
An AGV can also be called a laser guided vehicle (LGV) or self-guided vehicle
(SGV). Lower cost versions of AGVs are often called Automated Guided Carts (AGCs) and
are usually guided by specific lines magnetic tape. AGCs are available in a variety of models
and can be used to move products on an assembly line, transport goods throughout a plant or
warehouse, and deliver loads to and from stretch wrappers and roller conveyors.AGV
applications are seemingly endless as capacities can range from just a few kgs to hundreds of
tons. The Aim of the project is to design and fabricate such a AGV
There are many definitions of AGVs, different according to points of view.
Wikipedia, the free encyclopedia, defines AGVs as:
“A robot that been used highly in industrial applications to move materials from point to
point”

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The American Society of Safety Engineers (ASSE) defined AGVs as:
a. Machines without drivers that can move along pre-programmed routes, or use sensory and
navigation devices to find their own way around.
b. Vehicles that are equipped with automatic guidance systems and are capable of following
prescribed paths. Or Driverless vehicles that are programmed to follow guide path

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1.2 BACKGROUND
The creations of Automated Guided Vehicle (AGV) have been around since the 1950’s and
the technology was first developed by Barret Electronics from Grand Rapids, Michigan. It
was then developed by the Europeans in the 1970’s and nowadays AGVs can be found in any
countries. One of the first AGVs was a towing vehicle that pulled a series of trailers between
two points, and today’s there are many task given to AGVs and they also have their own
name and potentials.
Considering the full potentials and advantages of the Automated Guided Vehicle
(AGV) in our livings, it is valuable to do this project, as it also will be the first step towards
the creation of more intelligent technology or system. The simplest AGV model may use just
a sensor to provide its navigation and can be the complex one with more sensors and advance
systems to do the task. They can work or do the task everywhere needed but the safety for the
AGV as well as the people and environment surround it must be provided.
The AGVs is just the same as mobile robot, which can moves from one place to another
to do their task, but mostly the mobile robot is used for difficult task with dangerous
environment such as bomb defusing. Furthermore, the mobile robot can be categorized into
wheeled, tracked, or legged robot. Although the AGVs may not be glamorous of robots, but
their work, which usually menial, are often be essential to the smooth running of factories,
offices, hospitals, and even houses. They can work without any complaint around many
workplaces all over the world.
1.3 PROBLEM STATEMENT
There are many reasons which yield to the creation of Automated Guided Vehicle (AGV)
around the world. Mostly the reason is to overcome the logistic problems that often occurred
in the workplaces and to make improvement to the facilities provided in the workplaces.
Usually the AGVs are implemented in factories, hospitals, offices, houses, and even can be
found anywhere outdoors without the people surround realized it.

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In the industries or factories, the AGVs can ease the physical strain on human workers
by performing tiring tasks, such as lifting and carrying heavy materials, more efficiently with
no signs of fatigue creeping in. They can carry far more than human workers, and their
movements can be tracked electronically at all times. Their movements can be timed to feed
or collect products or materials from the work cells in the factories.
Besides that, in the hospitals thousands of staff spends a portion of their day moving
medical supplies, bedding, medicines and other equipment around large hospitals. By using
the AGVs, the strain on the workers can be ease as well as the hospital’s system would be
more smart and systematic without any bad complaint from the patients and people. AGVs
also capable of both cutting cost and releasing more staff hours to tend and care for patients.
Therefore it is very significant that the valuable knowledge on AGV construction is
studied and be further implemented from the result of this project. It is due to its advantages
to our own living and technology.
We have pleasure in introducing our project AGV, which is equipped by
microcontroller, motor driving mechanism, lift mechanism and battery. The power stored in
the battery is used to drive the DC motor that causes the movement as well as lifting power to
AGV. Battery assembled on the AGV is easily replaceable and detachable, used for
recharging the battery, while the AGV is under roof.

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1.4 PROJECT AND ITS SCOPE
The objective and scope of this project is to create an AGV model that can follow a trail of
line on a flat surface horizontally. This AGV model is using microcontroller to control all
navigation and lifting functions during its operation. In other words, the microcontroller acts
just like the brain for the model that controls all operation of the system.
The model is a three-wheeled mobile robot that has the ability to follow line on floor.
There are three wheels including two driving wheels controlled by two motors and a free
wheel in front that is able to rotate 360°. With three wheels, both driving wheels are always
in contact with the surface, because of the robot’s steering relies on both its driven wheels
being in contact with the surface at all times.
This project consists of four main stages, which are theoretical design, mechanical
fabrication, electronic hardware design and as well as algorithm design in assembly language.
The matter to be considered is how the robot can follow the trail of line continuously. It is
also important to choose the most suitable microcontroller, actuators, and sensors to achieve
the project objectives.
.

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1.5 MARKET SURVEY
A market survey is an important requirement for initiating any successful business. The
objective of a market survey is to collect information on various aspects of the business. This
survey is a tool through which we can minimize risk. After the market survey, the results
must be analyzed in order to finalize a business plan.
We are implementing automatic guided vehicle, which replaces the normal
transporting methods. So that we wants to consider all the sections related to this works such
as problems arising while installing. So we conducted a market survey by personnel interview
techniques was used with the measure emphasis on personal interview method. Interviews
were conducted through the structure questionnaire, Also we go through people who work in
large industries such as production plant, supply station etc.
The following questions are mainly taken for questionnaire:
Area of applications? i.e. inside/outside/both
Types surface of flooring?
Weights of loads max?
Distance to transportation?
From the data which we got from the market survey we are well know about the
things what the market needed, and what modifications should be taken to the system. And
we analysis the data and make objectives want to goal.

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CHAPTER II
LITERATURE REVIEW
Automatic Guided Vehicles (AGVs) have played a vital role in moving material and product
for more than 50 years. The first AGV system was built and introduced in 1953. It was a
modified towing tractor that was used to pull a trailer and follow an overhead wire in a
grocery warehouse. By the late 1950's and early 1960's, towing AGVs were in operation in
many types of factories and warehouses.
The first big development for the AGV industry was the introduction of a unit load
vehicle in the mid 1970s. This unit load AGVs gained widespread acceptance in the material
handling marketplace because of their ability to serve several functions; a work platform, a
transportation device and a link in the control and information system for the factory.
Since then, AGVs have evolved into complex material handling transport vehicles
ranging from mail handling AGVs to highly automated automatic trailer loading AGVs using
laser and natural target navigation technologies. In fact the improvement of AGVs over the
last decade is deeply indebted to development of Scheduling, Algorithm and Steering
methods. The problem of scheduling of AGVs and the other supporting equipments has been
extensively studied by Basnet and Mize and Rachamadugu and Stecke currently providing
the most up-to-date and comprehensive reviews in this area.
Han and McGinnis have developed a real time algorithm in which material handling
transporters are considered. Schriber and Stecke have shown how the additional consideration
of the material handling system and limited buffers degrades the system performance.
Sabuncuoglu and Hommertzheim have highlighted the importance of material handling and
they compared several AGV dispatching rules. They have also shown how the buffer capacity
can affect the performance of the system. Flexibility, which is a distinguishing feature of
FMSs, has received an extensive amount of attention. Routing flexibility (i.e., alternative
machines and processing routes) has been considered by Wilhelm and Shin, Chen and Chung,
and Khoshnevis and Chen . These studies have indicated that dynamic routing (i.e., a path
determined dynamically during schedule generation) performs better than a preplanned
routing.

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Rachamadugu et al. Have proposed a quantitative measure of sequence flexibility and
have shown that perfect sequence Flexibility improves system performance. Similar
observations have been made by Lin and Solberg. In most work to date, tools, pallets/fixtures
and their availability are not modeled adequately. A static allocation of tools is usually
assumed in these studies.
However, some researchers have considered a limited tool magazine capacity and the
changing of tools from central tool storage. One purpose of this thesis is to develop an
algorithm that can be used to investigate the research issues discussed above. This algorithm
should not only consider the major elements of FMSs but also generate high quality
schedules in a reasonable amount of time. In this thesis, the basic structure and characteristics
of such an algorithm is described.
Kim et al. Proposed a deadlock detection and prevention algorithms for AGVs. It was
assumed that vehicles reserve grid blocks in advance to prevent collisions and deadlocks
among AGVs. A graphic representation method, called the "reservation graph," was proposed
to express a reservation schedule in such a form that the possibility of a deadlock can be
easily detected. A method to detect possible deadlocks by using the reservation graph was
suggested.
Maxwell and Muckstadt first introduced the problem of AGV flow system design.
While their main concern is vehicle routing, they also address material flow path and station
location design issues. The flow network they used, known as conventional configuration, is
composed of unidirectional arcs. Gaskin and Tanchoco developed the first integer
programming model for material flow path design. Given a fixed network of aisles and fixed
pickup and delivery stations, the model assigns direction to arcs to minimize the total trip
distances of loaded vehicles. Goetz and Egbelu developed an alternative model, where the
station locations no longer are fixed but restricted to the nodes on the boundary of the cells.
Sun and Tchernev provide a comprehensive review on the models developed for conventional
configuration.
Afentakis states the advantages of the loop layout as simplicity and efficiency,
lowinitial and expansion costs, and product and processing flexibility. Loop layout has been
studied by many researchers including Bartholdi and Platzman , Sharp and Liu ,Kouvelis and

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Kim , Egbelu , Banerjee and Zhou , and Chang and Egbelu. Bozer and Srinivasan initiate the
concept of tandem configuration as a set of no overlapping, bidirectional loops, each with a
single vehicle.
Another problem in steering issues is to schedule several AGVs in a non-conflicting
manner which is a complicated real-time problem, especially when the AGV system is bi-
directional. In fact, many conflicting situations may arise such as head-on and catching-up
conflicts when the AGVs or the guide-paths are bidirectional and if no efficient control policy
is used to prevent them. Several conflict-free routing strategies have been proposed and can
be classified into two categories:
 Predictive methods: Aim to find an optimal path for AGVs. The conflicts are
predicted off-line, and an AGV’s route is planned to avoid collisions and deadlocks.
 Reactive methods: the AGVs are not planned and the decisions are taken in a real-
time manner according to the system state.
These methods are based on a zone division of the guide-path and consider them as
non sharable resources. Predictive methods give good performance, but are not very robust
since they do not take into account real time problems. However, reactive methods are very
robust but the resulting performances can be poor because the decisions are taken by
considering a very short-term time horizon. In this report due to specification of the whole
plan (presence of only one AGV) a kind of predictive method is proposed.
In early 1990s Fuzzy logic came through to control and manipulate whole of the
material flow in manufacturing floors. The main indication of employing this system on
AGVs was the ability of controlling multiple AGV in a same time without collision.However,
only simulation results are presented. Senoo et al used experimental results of a three
wheeled mobile robot to discuss the stability of a fuzzy controller. It is also stated that fuzzy
control was implemented in order to achieve reduction of steer energy, while maintaining
better steer angle when compared with PI control.
Fuzzy logic has found useful applications in control among other areas. One useful
characteristic of a fuzzy controller is its applicability to systems with model uncertainty
and/or unknown models. Another useful characteristic of a fuzzy logic controller is that it
provides a framework for the incorporation of domain knowledge in terms of heuristic rules.

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Wuwei et al. They presented the new navigation method for AGV with fuzzy neural network
controller when in the presence of obstacles. Their AGV can avoid the dynamic and static
obstacle and reach the target safely and reliably.
Wu et al. used fuzzy logic control and artificial potential field (APF) for AGV
navigation. The APF method is used to calculate the repulsive force between the vehicle and
the closest obstacle and the attractive force generated by the goal. A fuzzy logic controller is
used to modify the direction of the AGV in a way to avoid the obstacle. Lin and Wang
proposed a fuzzy logic controller for collision avoidance for AGV.
They combined fuzzy logic with crisp reasoning to guide an AGV to get out of trap
since memories of path and crisp sequence flows are handled by non-fuzzy processing. Their
designed AGV was able to avoid collision with unknown obstacle. Alves and Junior used a
step motor to turn the direction of the ultra-sonic sensors, so that each sensor can substitute
two or more sensors in mobile robot navigation. Perhaps Sugeno has done one of the
pioneering researches in mobile robot navigation using fuzzy logic control. The fuzzy control
rules, which he defines for the controller, were derived by modeling an expert driving action.
He made a computer model of a car in microcomputer to find fuzzy rules. The speed of the
designed car was constant; then, the control input to the car is only the angle of the steering
angle
Mehdi Yahyaei has design a AGV using fuzzy logic system and a rotational ultra
sonic sensor to steer the AGV to avoid collisions and obstacles. He also employed a
programmable logic control (PLC) as the processor which makes the AGV to be ultimately fit
to the industrial environments.
2.1 AUTOMATED GUIDED VEHICLE BUILT WORLDWIDE
Some of the Automated Guided Vehicles (AGVs) that are well known are discussed
in brief.

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2.2 MOBILE POST DISTRIBUTION SYSTEM (MOPS)
MoPS or Mobile Post Distribution System (Tschichold, Vestli, Schweitzer, 1999) is a
research AGV developed at the Institute of Robotics in Zurich, Switzerland. It is used to
transport mail around the Swiss Federal Institute of Technology in Zurich. MoPS is powered
up by rechargeable batteries which give it a 4-hour active life, weighs around 90kg and can
carry up to 50 kg of postal payload. It is also capable of hot-swapping its own batteries pack,
thus ensuring 24h availability.
The MOPS provide services of picking up boxes with incoming mail at the ground
floor of the five floor building, which is sorted by human first, delivering them to the
secretaries' offices, subsequently bringing back the outgoing mail to the ground floor station.
It is also capable of switching floors by sending an infrared signal to the building’s lifts. As
the building is open to the public, protection against theft of the mail is provided by
motorized blinds over the pigeon-hole mail points, which can be opened by the robot and by
authorized staff.
Fig 2.1 The Mobile Post System MOPS

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2.3 PARKSHUTTLE AGVS OF AMSTERDAM’S SCHIPHOL AIRPORT
Fig 2.2 The ParkShuttle AGVs of Amsterdam’s Schiphol Airport.
The ParkShuttle (FROG Navigation Systems) is an automatic navigating vehicle which
provides transportation for passengers. It is a people mover system. There is no driver
onboard, instead a computer and an electronic navigation system do the driving. This
ParkShuttle has a safety system of sensitive and intelligent sensors. The sensors scan the area
in front of the vehicle and will decelerate or stop the vehicle when an unknown obstacle is
detected.
An additional safety feature is provided by the bumper system that brings the vehicle
to an immediate halt when it is impressed. In addition, the vehicle has emergency stop
buttons (both inside and outside) that can be operated by the passengers. The speed is limited
to 40 km/h obtain a good ride quality. 8 The ParkShuttle vehicle runs on four rubber tires.
Traction is provided by an electric motor powered by a rechargeable battery. Up to 100 km
can be covered on one battery-load. It has a capacity of 10 passengers, 6 seated and 4
standees. It is easy to get into and out of the vehicle (wheelchair accessible) and provides
good all-round visibility. Inside the vehicle is a console on which the passengers can indicate
their destination.
Each vehicle is also fitted with an information display that announces the stop at which the
vehicle has arrived. The maximum load is 800 kg. The maximum vehicle weight is monitored
by means of weight sensor.

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2.4 LINE FOLLOWING ROBOT
Line following robot is generally a wheeled mobile robot. The method of line following
varied depending on the number of sensors available and the type of line to be followed.
There are four methods identified including edge following, line search, line trap, and cross-
over. These four methods are different in number of sensors that used and also the results that
will be obtained are different. With only one light sensor, the robot will have to know where
the line is, or spends time searching to find it. Whereas with two light sensors, the robot is
possible to remember which direction the line went. With more sensors, the result that will be
obtained would be more excellent and the robot will be more intelligent.
Table 2.1 Line Following Method
Method Characteristics
Edge following Stay on the edge of the line
Line search Stay on the line
Line trap Keep the line between the sensors
Cross over Move back and forth over the line
2.5 KERWIN’S LINE FOLLOWING ROBOT
Fig 2.3 The Kerwin’s line following robot using three matched IR transmit/receive pairs
The Kerwin’s line following robot (ranchbots) is a design with Futaba S-148 servo
motors mounted to the bottom of the plexiglass. It has three wheels with the front wheel is the
omni-directional wheel. The sensor system consists of an array of three matched IR
transmit/receive pairs mounted on a circuit board that can be raised or lowered to fine tune
the sensitivity. It uses the Atmel microcontroller as the controller part. The microcontroller
takes input from sensor array and drives the servo motors in response.

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CHAPTER III
COMPONENTS SELECTION & DESCRIPTION
3.1 DESIGN OBJECTIVES
In nowadays AGV has a greater influence in the production field. Why we prefer this system
is mainly because of its accuracy to transport goods, avoiding accidents at industrial zone,
decreasing production overall cost etc.
In our project the important factor is that, we give an additional functions to AGV, i.e.
we provide a lifting mechanism to take loads from station to station. The lift will actuate at
those particular stations using sensors. Also we provide a sensor which detects the objects in
the paths to avoid collision with those objects, by stopping the vehicle and moves after the
when object leaves the path.

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3.2 DESIGN CONSIDERATIONS
In design problems many decision variables arise. The impact of decisions on mutual
interactions and performance might be difficult to predict. It might be hard to decide on one
thing without considering other decision variables. At least the following tactical and
operational issues have to be addressed in designing an AGV system
• Flow path layout
• Traffic management: prediction and avoidance of collisions and deadlocks
• Number and location of pick-up and delivery points
• Vehicle requirements
• Vehicle routing
• Vehicle scheduling
• Battery management
A flow path layout compromises the fixed guided paths on which vehicles can travel
to the various pick-up and delivery points of loads. Traffic management is required to avoid
collisions and deadlock situations in which two or more vehicles are blocked completely. To
ensure that loads are transported in time, sufficient vehicles should be available and the right
vehicle should be dispatched to the right load.
This layout is usually represented by a directed network in which aisles intersections
and pickup and delivery locations can be considered as nodes. The arcs represent the guide
path the AGVs can travel on. Directed arcs indicate the direction of travel of vehicles in the
system. The layout of this flow path directly influences the performance of the system. In our
project we just mark two stations only. One loading and one unloading station. The carrier
moves in the loop which connects these two stations.
In controlling and designing AGV systems the problem of prevention of AGV
collisions and deadlocks should be addressed. By attaching sensors on AGVs, physical
collisions can be avoided. An AGV should have the ability to avoid obstacles and the ability
to return to its original path without any collisions. We had fabricated only one AGV. So the
traffic management has only less important in our case. But while using more than one carrier
we should take care about them.

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To determine an optimal AGV’s system, capable of meeting all requirements, many
factors have to be taken into account. Several of these factors are:
• Number of units to be transported
• Points in time at which units can be or need to be transported
• Capacity of the vehicle
• Speed of the vehicle
• Costs of the system
• Layout of the system and guide path
• Traffic congestion
• Vehicle dispatching strategies
• Number and location of pick-up and delivery points
If AGVs use batteries, frequent battery changing might be required. McHaney (1995)
presents an overview of AGV battery technology. The time required for replacing or charging
batteries can impact the number of vehicles required. Simulation results from McHaney
(1995) indicate a significant increase in the number of AGVs required while incorporating
battery management issues in the simulation study compared to neglecting these issues in the
studies. Furthermore, the time required for charging batteries impacts throughput, congestion
and costs.

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3.3 COMPONENTS OF AGV
1. MECHANICAL PARTS
The Mechanical components includes,
1. Chassis
2. Steering system
3. Lift mechanism
Chassis
Act as a frame for attaching other components
Carry the load of other components and the payload.
Act as sacrificial component to prevent damage of expensive payload in case of
accidents
Steering System
Steering system is for steering the AGV. The two individual motors are directly attached with
the wheel for steering
Lifting Mechanism
Lifting mechanism is one of the main part of AGV, the lifting surface moves upward and
downward at specified stations. And carry the load during load transfer.

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2. ELECTRICAL COMPONENTS
Electrical components include the motor and the power supply unit for the motor, sensoring
unit
3. ELECTRONIC COMPONENTS
Electronic components provide sensing, logical decision and control of the vehicle. It
includes microcontroller, which is the brain of the vehicle for the decision logic, the motor
driver as both sensing and control of motor, regulator ICs, LCD Display unit, sensors for
sensing the path, position of loading and unloading stations, detect object in the path etc.
4. SOFTWARE COMPONENTS
Computer is used for making and implementing program for the microcontroller, using
embedded computer programming language. For this project we use Arduino Uno
microcontroller board based on the ATmega328 .The Arduino Uno can be programmed with
the Arduino software.

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3.4 MECHANICAL PART
3.4.1 CHASSIS
The chassis is fabricated from Acrylic sheet. This is done for ease of fabrication, and to
reduce the overall weight. It was designed in Catia; part of fabrication was outsourced due to
unavailability of precision cutting tools. The chassis was designed to take a static load of 3kg.
The Top part of chassis has lots of drilled holes which serves as holes for bolting
other parts and reduce the weight of the chassis. The Holes are arranged in a zigzag linear
arrangement so that the decrease in strength of chassis is not considerable.
The flange which holds the motor was designed using Aluminium and is bolted to the
chassis. So that the driving motors can easily accommodate below the chassis. The chassis
incorporates hole for attaching front globe wheel, and also for attaching the lift structure
Fig 3.1 Chassis of AGV
Table 3.1 Technical Data of Chassis
Features Data
Length 300mm
Breadth 160mm
Height 62mm
Material Colored Acrylic sheet, Aluminum
Maximum load
Mounting Holes 14×3mm ø Holes for general mounts
2×8mm ø Holes for motor
1×10mm ø Hole for switch

20
3.4.2 STEERING SYSTEM
The steering system used in the model is of differential type. A differential wheeled vehicle is
a vehicle whose movement is based on two separately driven wheels placed on either side of
the body. It can thus change its direction by varying the relative rate of rotation of its wheels
and hence does not require an additional steering motion. It allows the turning center to be on
the vehicle body thus the ability to rotate on the point
Fig3.2 Differential Steering
If both wheels rotate at the same speed and in the same direction, the robot will move
in a straight line.

21
Fig 3.3 Small radius turning
If one of the wheels is stopped, while the other continues to rotate, the robot will pivot
around a point centred approximately at the mid-point of the stopped wheel.
Table 3.2 Steering Specifications
Feature Data
Wheel Base 180mm
Wheel Diameter 70mm
Track Distance 170mm
Material Rubber and plastic
Turning radius 190mm

22
3.4.3 LIFTING MECHANISM
The lift is the main component of this AGV. The lift takes and gives loads at specific stations.
The vehicle under stands the stations using sensors. Lift is attached in the front portion of the
chassis. The power for lift is transmitted from a motor using a threaded shaft.
The lift consists of mainly two plates. One is centrally drilled and tapped. Second
plate is attached with the lower one, using bolts, at a distance. The shaft of the motor drilled
axially and made internal threads using tap. Both the plates moves in between two guide
ways. The threaded shaft is passed through the centrally tapped hole of lower plate.
During the rotation of shaft the lower plate moves up or down. And the upper plate
moves according to it. The time for the rotation is limited for few seconds. It can be adjusted
by making changes in the microcontroller program. A magnet is attached above the upper
plate, which helps to hold the items to be lift, which have magnetic behavior.
Fig 3.4 Lifting using threaded shaft

23
4
3
1
2
In order to reduce the overall cost and weight of the AGV, we used acrylic sheets for
the manufacturing of lifting surfaces, Aluminum C channels for the guide ways in between
the plates moves are used for the fabrication.
Fig 3.5 Structure of lift
1. Guide ways
2. Threaded shaft
3. Lower plate
4. Upper plate

24
3.5 ELECTRICAL COMPONENTS
3.5.1 DC MOTOR
100 RPM DC Motor with Gearbox generally used for robotic application are used for the
driving mechanism, steering mechanism and lifting mechanism. We can adjust it to desired
RPM using gear box. Very easy to use. It is excellent for line tracking robotic application.
Fig 3.6 DC Motor with Gear box
Table 3.3 Motor Specifications
Feature Data
Supply voltage 12V DC
Speed 100 RPM with gear box
Shaft Diameter 6mm
Weight 125gm
Torque 12Kgcm
No-load current 60mA(Max)
Load current 250ma(Max)

25
3.5.2 BATTERY
The power required for the entire working process is given by a Rechargeable valve regulated
Lead-Acid battery. The power from the battery is split it into two and one part is given to
microcontroller, display unit, driving unit and other part is given to lifting motor.
Fig 3.7 Battery
Table 3.4 Battery Specification
Features Data
Speed 100rpm
Voltage 12V DC
Torque 12Kg-cm
No load current 60mA
Load current 250mA

26
3.6 ELECTRONICS COMPONENTS
3.6.1 MICROCONTROLLER
A microcontroller (µC, uC or MCU) is a small computer on a single integrated circuit
containing a processor core, memory, and programmable input/output peripherals.
Microcontrollers are designed for embedded applications, in contrast to the microprocessors
used in personal computers or other general purpose applications.
We use ATmega 328 in our AGV.The Atmel®AVR® ATmega 328 is a low-power
CMOS 8-bit microcontroller based on the AVR RISC architecture. By executing powerful
instructions in a single clock cycle, the ATmega8 achieves throughputs approaching 1MIPS
per MHz, allowing the system designed to optimize power consumption versus processing
speed.
The reasons for using ATmega 328 are:
Low cost
Easy to program
High-performance, Low-power
Fully Static Operation
High Endurance Non-volatile Memory segments
Power-on Reset and Programmable Brown-out Detection
Internal Calibrated RC Oscillator
External and Internal Interrupt Sources
High stress value
Five Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, and
Standby
I/O and Packages
23 Programmable I/O Lines
28-lead PDIP, 32-lead TQFP, and 32-pad QFN/MLF
Operating Voltages
2.7V - 5.5v to 4.5V - 5.5V

27
The Microcontroller is programmed with the required program to accept the data from
the sensing unit, interpret it, and give responses to the driving and lifting mechanism in very
small time interval.
Table 3.5 Specification of ATmega 328
Type: 28Pin DIP Package
Flash 32K Bytes
I/O pins 23 Pins
Minimum/Maximum Voltage: 1.8/5.5V
Maximum current: 20mA
Number of PORTS 4
No of channels 6
Bus width 10Bit
Oscillation Speed 20Mhz
PWM 6
Table 3.6 Important Connections
PIN Name Pin No
Vcc 7
GND 8,22
XTAL1 9
XTAL2 10
RXD/PD0 2
PB4 16
PB5 19
PB6 9
PB7 10
Reset 1
Rxd 2
Txd 3
AVCC 20
AREF 21

28
Fig 3.8 ATmega 328 microcontroller

29
3.6.2 MOTOR DRIVER
It is an electronic circuit which enables a voltage to be applied across a load in either
direction. It allows a circuit full control over a standard electric DC motor. That is, with an H-
bridge, a microcontroller, logic chip, or remote control can electronically command the motor
to go forward, reverse, brake, and coast.
A "double pole double throw" relay can generally achieve the same electrical
functionality as an H-bridge, but an H-bridge would be preferable where a smaller physical
size is needed, high speed switching, low driving voltage, or where the wearing out of
mechanical parts is undesirable. The term "H-bridge" is derived from the typical graphical
representation of such a circuit, which is built with four switches, either solid-state (e.g.,
L293/ L298) or mechanical (e.g., relays).
In our AGV we use the driver IC L293d. There are two driver ICs are provided in the
design, because three motor are in the AGV. One driver circuit is connected to the two
motors of driving mechanism. And second one is used for the motor which is incorporated
with the lift.
Fig 3.9 Motor Driver (L293D)

30
The following figure shows the connection of the driving mechanism.
Fig 3.10 L293D connected with two motors
To simplify use as two bridges each pair of channels is equipped with an enable input.
A separate supply input is provided for the logic, allowing operation at a lower voltage.
This device is suitable for use in switching applications at frequencies up to 5 kHz.
In the lifting section one motor is utilized. So the one side of the driver circuit is not
connected.
Fig 3.11 L293D connected with one motor

31
In the both end of a motor voltage is always 5v. So there no potential difference between the
two terminals of the motor. Therefore there is no current flow between terminals, and motor
will not work. During the operation at one terminal the voltage becomes zero volts. And thus
the current flows through the motor and it works. We can rotate the motor in two directions.
In the driving mechanism, in our design one direction of rotation of motor is needed.
Because the AGV doesn’t wants to moves in reverse. But the connection is made in such a
way that both two motors rotate in opposite direction. i.e., the motor which rotates the right
wheel in clockwise direction and that of left wheel rotates in counter clockwise direction.
But the lifting motor wants to rotate in the both directions. For the clock wise rotation
lift move up and for counter clockwise it moves down. The movement of the lift surface
depends on the internal thread of the lower plate also.
Fig 3.12 Circuit connection of driving motor
Fig 3.13 Connection of lifting motor for clock wise and counter clock wise rotation

32
To control motor speed we can use pulse width modulation (PWM), applied to the enable
pins of L293d driver. PWM is the scheme in which the duty cycle of a square wave output
from the microcontroller is varied to provide a varying average DC output.
Fig 3.14 PWM
Table 3.7 Technical Specification of L293D
Symbol Parameter Data
Vs Supply Voltage 36V
Vss Logic Supply Voltage 36V
Vi Input Voltage 7V
Ven Enable Voltage 7V
Io Peak Output Current 1.2A
Ptot Total Power Dissipation at Tpins=90ᵒc 4W
Tstg,Tj Storage and Junction Temperature -40 to 150
ᵒc

33
3.6.3 REGULATORS
Mainly two types of voltage regulators are used in the design. One is variable and the next is
not. The non variable belongs to 78 series. And variable is LM series. The main supply is
12V. But we need only 5V. It is made possible using these regulators
3.6.3.1 7805 Regulator
It is the one of the important electronic part. The motor, driving IC, microcontroller etc need
only 5V for their operations. Before the supply is given to these circuits it is given to the
7805 voltage regulator. It reduces the voltage from 12V to 5V.
Fig 3.15 7805 REGULATOR
The main features of these regulators are:
Internal Thermal Overload Protection.
Internal Short Circuit Current Limiting.
Output Current up to 1.5A.
Satisfies IEC-65 Specification.
Table 3.8 Maximum Ratings of 7805
Characteristic Symbol Rating
Input Voltage Vin 35V
Operating Junction
Temperature
Tj -40 to 150 ᵒc
Storage Temperature Tstg -55 to 150 ᵒc
Max. junction Temperature Tj(max) 150 ᵒc

34
Table 3.9 Technical Specifications of 7805
ELECTRICAL CHARACTERISTICS (VIN=10V, IOUT=500mA, 0ᵒc≤ Tj≤ 125ᵒc)
Characteristic Data
Output Voltage 4.8 to 5.2 V
Input Regulation 100 mV
Output Noise Voltage 50 microVrms
Ripple Rejection Ratio 78dB
Drop Out Voltage 2.0V
3.6.3.2 LM317 VARIABLE REGULATOR
There are five variable regulators are used in our design. Its used for reduce the
voltage to the motor and to sensors. It will helps to reduce the speed of rotation of the
motor and thus we can adjust the speed of the vehicle.
Fig 3.16 LM317 circuit
Table 3.10 Technical Specificationsof LM 317
Parameter Data
Line Regulation 0.01 %/V
Load Regulation 0.1%/V
Thermal Regulation 0.04%/W
Current Limit 2.2A
Ripple Rejection Ratio 65dB
Long term stability 0.3%
RMS Output Noise 0.003%

35
3.6.4 INFRARED SENSORS
IR Sensor is one of the important parts. Path detection and obstrucle detection is done with
the help of IR Sensors. There are five IR Sensors are in our AGV. Out of them four are used
for the path detection and rest of one is used for obstrucle detection.
IR sensor have a transmitter and a receiver port.
The strength of signal reached at the receiver port after the reflection of light is used
to detect the path. Path is marked in the black background by white lines. Sensor detect the
white line by the strength of IR wave. The reflected wave from white line has high strength
than that of from black. TSOP1730 are used in the design.
Fig 3.17 IR for Path Detection

36
The IR pair circuits are shown in the figure give below:
Fig 3.18 IR pair Circuit

37
The main features of this IR pair are:
Photo detector and preamplifier in one package
Internal filter for PCM frequency
Improved shielding against electrical field disturbance
TTL and CMOS compatibility
Output active low
Low power consumption
High immunity against ambient light
Continuous data transmission possible (up to 2400 bps)
Suitable burst length 10 cycles/burst
Table 3.11 Technical Specifications of IR pair
Characteristics Data
Supply Voltage -0.3 to 6.0V
Output Voltage -0.3 to 6.0V
Junction Temperature 100 ᵒc
Operating Temperature -2.5 to 85ᵒc
Power Consumption 50mW
Irradiance 30W/m²
Directivity ±45º

38
3.6.5 MAGNETIC SENSOR
Magnetic sensors or magnetic switches are electronic switches that close under the magnetic
field. In this AGV there are two magnetic sensors. XEN-1210 is the sensor used in this
design.
The XEN-1210is a CMOS linear magnetic field sensor with a very low offset. It uses
Xensor's patented high performance spinning-current Hall-plate technology, a precision
amplifier and a sigma delta AD converter, and offers full digital control and communication
through a SPI serial bus. The device does not need calibration and in contrast to low-offset
AMR sensors does not use a set/reset method. It has no hysteresis and is indestructible by
high magnetic fields. It does not need any external components and is truly a one-chip
solution.
These sensors are used for the purpose of position detection. It is used for detect the
loading and unloading station. The sensor is attached with the vehicle at two different
positions. Magnets are placed in such a way that one sensor close when the vehicle comes to
the loading station. And when that switch close lift operates and moves up. After loading the
vehicle moves along the path. When it reach the unloading station the next sensor close and
lift operates to move down.
The main features of this sensor are
Single axis magnetic measurement
One chip solution
15nT resolution
Wide magnetic field range (±63mT)
No magnetic hysteresis
Low voltage operation (2.5V to 3.3V)
Single supply
-40°C to 125°C Temperature Range

39
Fig 3.19 Magnetic sensor
It’s a glass capsule, inside the tube there are two reed blades, which is connected to the
voltage terminal. Reed blades are placed over lapped, but not connected. There is a contact
gap between the blades. And the tube is filled with inert gas.
Table 3.12 Technical Specifications of Magnetic sensors
Specifications Data
VDD 3.3V
Field Range ±63mT
Resolution(24 bits) 7.5nT/LSB
Hysteresis 10nT
Noise 55nT/Hz^½
Temperature range -40 to 125 ºC

40
3.6.6 DISPLAY UNIT
It’s just to display the inputs and outputs of the system. It mainly displays the inputs of path
sensing IR sensors and working of the vehicle. Inputs are displayed using numbers.
JHD162A SERIES is the display unit used in the AGV.
Characteristics:
Char. Dots 5 x 8
Display content 16 CHAR x 2ROW
Driving mode 1/16d
Available types:
TN STN (yellow green)
Reflective with El or Led Backlight
EL/100VAC 400HZ
LED/4.2VDC
Table 3.13 Technical Specifications of Display unit
Parameter Data
Supply Voltage 5.0V
Input High Voltage 2.2V
Output High Voltage 2.4V
Operating Voltage 1.5mA
Table 3.14 Pin Configurations
Pin Connection
1 Vss
2 Vcc
3 VEE
4 RS
5 R/W
6 E
7 DB0
8 DB1
9 DB2
10 DB3
11 DB4
12 DB5
13 DB6
14 DB7
15 LED+
16 LED-

41
Fig 3.20 Application Circuit of display unit

42
3.7 SOFTWARE COMPONENTS
We use ATmega328 microcontroller in this AGV. The microcontroller is the brain of the
vehicle. So the programming of the microcontroller has great imporantance in the working.
Arduino software is used to program the microcontroller. Program is burned using special
microcontroller board. For this ATmega328 microcontroller Arduino Uno board is used.
The Arduino Uno is a microcontroller board based on the ATmega328 . It has 14
digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a
16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset
button. It contains everything needed to support the microcontroller; simply connect it to a
computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
Arduino is an open-source electronics prototyping platform based on flexible, easy-to-
use hardware and software. It's intended for artists, designers, hobbyists, and anyone
interested in creating interactive objects or environments.
The program is written in the Arduino software using special commands. The main
feature of this software is that we can run the program before burning in to the
microcontroller. And we can check the function. It will helps to make changes in the
program, in easy way.
The program is written in such a way that when the vehicle is in on condition, the four
line detecting sensors works and detect the line. If the middle sensors close, the two driving
motor rotates. If left sensors close right motor works, if right sensors close left motor works.
If the object detector sensor closes, all the two motors stops whatever may be the line
detecting conditions.
When the right magnetic switch closes the third motor rotates in clockwise, when left
switch closes it rotates in anti clockwise direction. All the input signals for the line detection
and position detection are shown in the LCD display. Also the working status is shown in the
display

43
3.8 PROGRAM SOURCE CODE
#include <LiquidCrystal.h>
int a = 0;
int b = 0;
int c = 0;
int d = 0;
int e = 0;
int f = 0;
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);
void setup()
{
Serial.begin(9600);
pinMode(A0, INPUT);
pinMode(A1, INPUT);
pinMode(A2, INPUT);
pinMode(A3, INPUT);
pinMode(A4, INPUT);
pinMode(A5, INPUT);
pinMode(7, OUTPUT);
pinMode(6, OUTPUT);
pinMode(5, OUTPUT);

44
pinMode(4, OUTPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
lcd.begin(16, 2);
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("L F Robot");
delay(1000);
}
void loop()
{
a = digitalRead(A5);
b = digitalRead(A4);
c = digitalRead(A3);
d = digitalRead(A2);
e = digitalRead(A1);
f = digitalRead(A0);
lcd.print("A:");
lcd.print(a);
lcd.print("B:");

45
lcd.print(b);
lcd.print("C:");
lcd.print(c);
lcd.print("D:");
lcd.print(d);
delay(100);
if((a==LOW && b==HIGH && c==HIGH && d==LOW) || (a==HIGH && b==LOW &&
c==LOW && d==HIGH))
{
lcd.clear();
lcd.print("Forward");
Serial.print("Forwardt");
digitalWrite(3, HIGH);
digitalWrite(6, LOW );
delay(200);

46
}
else if((a==LOW && b==LOW && c==HIGH && d== LOW ) || (a==HIGH &&
b==HIGH && c==LOW && d== HIGH ))
{
lcd.clear();
lcd.print("Left");
Serial.print("Leftt");
delay(200);
}
else if((a==LOW && b== HIGH && c==LOW && d==LOW) ||(a==HIGH && b==LOW
&& c==HIGH && d==HIGH))
{
lcd.clear();
lcd.print("Rihgt");
Serial.print("Rihgtt");

47
delay(200);
}
else if((a==HIGH && b==HIGH && c==HIGH && d==HIGH )|| (a==LOW && b==LOW
&& c==LOW && d==LOW) )
{
lcd.clear();
lcd.print("Stop");
Serial.print("Stopt");
delay(200);
}

48
if(f==HIGH)
{
while(1)
{
lcd.clear();
lcd.print("arm up");
digitalWrite(3, LOW);
delay(18000);
delay(200);
break;
}}
if(e==HIGH)

49
{
while(1)
{
lcd.clear();
lcd.print("arm down");
digitalWrite(2, LOW);
delay(18000);
delay(200);
break;
}}
delay(100);
}

50
CHAPTER IV
DEVELOPED PROTOTYPE
4.1 STRUCTURE
The vehicle is designed in such a way that, have stability during loading and working. The
lifting parts are provided in the front position. It comes above the front globe tyre. The
electronic and electrical parts are situated the rest of surface. Motor for driving are provided
in the rear region. Hence during dynamic loading the vehicle will be stable.
The structure of the vehicle is shown in the figure,
Fig 4.1 Front view of AGV

51
Fig 4.2 Top view of AGV

52
4.2 SENSORS POSITIONS
The positions of sensors are important factor to detect the position. The sensors for detecting
the path are situated after the front wheel. But the obstruction detection sensor is placed
below the chassis, and in front of the front tyre. There are four IR sensors used to detect the
path. They are along a line parallel to the breadth. And side sensors are placed at an equal
distances from middle sensors.
The width of the white line is little more than the distance between two sensors. All
the four sensors were give different movements during different combination. The
combination means closing of IR sensors. According to it the working of the driving motors
change. Initially the AGV is placed above the line, in such a way that the two middle sensor
comes above the white line.
During the straight path the middle sensors close, the two motors run in forward
direction with equal speed. Thus the vehicle moves in the straight line. When two of the left
side close left motor stops and right works. Then the AGV takes a left turn depending upon
the curvature. And when two right side sensors close,right side motor stops and the left
works. Thus the AGV takes a right turn.
Fig 4.3 IR Sensors positions of AGV

53
The design of path is very important for an AGV. The magnetic sensors are placed below the
driving motors. Two magnets are used to detect the loading and unloading station. There is a
particular distance between those sensors and the lift. The loading stand should be placed
about at that distance from the magnet. Lifting up sensor is placed below the right motor. So
one of the magnet is placed in the right side of the path. Lifting stand is placed about a
distance from that magnet. The magnets are placed in such a way that any one of its poles
comes to top. Only then the magnetic switch works.
Fig 4.4 Magnetic sensors positions

54
4.3 FLOW CHART
Fig 4.5 Flow chart
DetectNot Detect
OnOff

55
4.4 BLOCK DIAGRAM
Fig 4.6 Block Diagram
Block diagram is a diagram of a system, in which the principal parts or functions are
represented by blocks connected by lines that show the relationships of the blocks. They are
heavily used in the engineering world in hardware design, electronic design, software design,
and process flow diagrams. In this diagram direction of all arrows are either from or to the
microcontroller.
MICRO-
CONTROLLER
LCD
MOTOR 1
POWER SUPPLY
MOTOR
DRIVER
MOTOR 2
MAGNETC REED
SENSOR
LINE DETECTOR
SENSOR
MOTOR
DRIVER
MOTOR 3
OBJECT DETECTOR
SENSOR

56
4.5 CIRCUIT DIAGRAM
Fig 4.7 Circuit Diagram

57
The fully fabricated prototype of Automatic Guided Vehicle has possessed the intelligences
such as following a particular line, loading and unloading at particular stations and collision
avoidance etc.
Fig 4.8 Fully Developed Prototype

58
4.6 THEORETICAL AND LOGICAL CALCULATIONS
Torque of DC motor used, T = 12Kg-cm
= 1.1772 N-m
Speed of motor, N = 100 RPM
Angular Velocity, ω = 2ΠN/60
= (2*Π*100)/60
= 10.47 rad/sec
Physically Power is the rate of doing work. For linear motion, power is the product of force
multiplied by the distance per unit time. In the case rotational motion, the analogous
calculation for power is the product of Torque multiplied by the rotational distance per unit
time
Rotational Power, P = T * ω
= 1.1772*10.42
=12.33 W
No. of motors available for driving mechanism = 2 motors
So total power available for driving = 2* 12.33
= 24.66 W
There is only one motor is used for the lifting purposes,
So maximum power available at lifting mechanism = 12.33 W

59
We have relation, v = r*ω
Where, v= Linear velocity
R= Radius
ω= Angular velocity
Diameter of shaft, d= 0.6cm
Radius of shaft, r= 0.3cm
=0.3*10^ (-2)
∴ Linear velocity, v = (0.3*10^ (-2)) * 10.47
= 0.03141 m/s
= 3.14 cm/s
Weight of carrier = 1.495 Kg
Width of line marking= 4.3cm
For Lifting section,
Shaft Torque, Tsh = output/2ΠN
= 1.1772/ (2Π*100)
= 1.8735* 10^ (-3) N-m
Force * Distance = Torque
Distance to be lifted, l= 5mm
Force * (5*10^ (-3)) = 1.8735*10^ (-3)
Force, F = 3.75 N

60
Force, F= Load * g
Acceleration due to gravity, g= 9.81m/
Load = 3.75/9.81
= 0.383 Kg
≈400 gms

61
4.7 BILLING
NO ITEM NO. ITEM COST/ITEM TOTAL
COST,(R.S)
1 DC Motor 3 200 600
2 Micro Controller 1 350 350
3 Driver IC 2 100 200
4 LCD Display 1 350 350
5 IR Sensors 5 175 875
6 Magnetic Switch 2 80 160
7 Acrylic Sheet 1 160 160
8 Aluminum channel 1 30 30
9 Battery 1 400 400
10 Fasteners 25 25
11 Magnets 3 25 75
12 Sticking Glues 2 30 60
13 Electronic Components 250
14 Arduino board 1 1350 1350
Total 4885
Table 4.1 Billing Table

62
CHAPTER V
CONCLUSION
The AGV is a productivity increasing feature in a factory. During the manufacturing of this
AGV we had found many of intelligence that can be given to it. We provide the basic
functions like line following and collision avoiding. And the main function, transportation of
goods from station to station. The followings are the main features of the prototype which we
fabricated.
1. Speed of delivery
2. Adjustment of vehicle speed
3. Flexibility of path
4. Adaptive to changes in factory layouts
5. Avoid collision with other objects
6. Reduction in labour cost
7. Reduction in running cost compared to conveyer systems
8. Ability to add sensors to detect the payload conditions
9. Ability to adjust the lifting time
10. Continues cycle of working
11. Conditions for line following can be change easily
Automatic Guided Vehicle can be used in a wide variety of applications to transport
many different types of material including pallets, rolls, racks, carts, and containers. AGVs
excel in applications with the following characteristics:
 Repetitive movement of material over a distance
 Regular delivery of stable loads
 Medium throughput/volume
 When on time delivery is critical and late deliveries are causing inefficiencies
 Operation with at least two shifts
 Archive Systems
 Cross Docking
 Distribution
 High Density Storage

63
 High Speed Sortation
 Material Flow and Transport
 Production and Manufacturing Delivery Systems
 Production and Manufacturing Support Systems
 Warehouse Management and Control
 Work-In-Process Buffers
The fabricated models have following advantages while comparing with the existing
models of this kind. The analyzing of advantages helps to motivate the fabrication of
AGV in the manufacturing industries. The important advantages of the prototype are
given below
 Reduce manpower
 Increase productivity
 Eliminate unwanted fork trucks
 Reduce product damages
 Maintain better control of material management
 Traffic control is not needed in this system because of single carrier
 Suitable to transfer frames
Each of the machines has their own merits and demerits. During the production we
had faced many problems. Much of them were solved during the assembling. But still
some of them stand here, which can’t have to remove. The followings are the
limitations of the prototype fabricated:
 Installation cost is very high.
 AGVs are fragile and should be handled with care.
 Regular care, inspection and maintenance needed
 Should be recharged periodically
 AGV will stop delivery when it is forced off the path.
 Battery should be recharged during intervals.
 Sun light affect the movement.

64
REFERENCES
www.elsevier.com/locate/ejor/Survey of research in the design and control
of automated guided vehicle systems
www.jbtcorporation.com/en/Solutions/Automatic-Guided-Vehicles
http://www.arduino.cc/
www.atmel.com/devices/atmega328
www.sunroms.com
Automation, Production Systems, And Computer Integrated Manufacturing, By Groover,
Mikell.P, ISBN 8120334183

Fabrication of Automatic Guided Vehicle

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