android control obstacle avoiding robot

1. Welcome to our presentation
on
Touch
Android
App
Micro
Controller Moto
r
Obstacle avoiding Robot
Date: 28th May, 2015

2. PREPARED BY :
1. MD. JOBAER ID: 120200203
2. MD. MURSHIDUZZAMAN ID:
120200183
3. SAJIB SARKER ID: 120200181
Supervised by:
ASM SHAMSUL AREFIN .
ASSISTANT PROFESSOR.
NUB.
Project name
Android phone controlled Obstacle avoiding robot.

3. An over view of the project
 Introduction.
 Objective.
 Project summary.
 Basic block diagram of the project.
 Circuit module.
 Working procedure.
 Future extensions.
 Discussion.
 Conclusion.

4. Introduction
Robotics
Robotics is the branch of mechanical engineering, electrical
engineering and computer science that deals with the design,
construction, operation, and application of robots, as well as
computer systems for their control, sensory feedback, and
information processing.
It may be human controlled or automatic.

5. Objective
Control a robot by using smart phone & microcontroller to
avoid the obstacle.

6. Project summary
 The modules include Atmega8 microcontroller part,
L293D motor driver part and HC-05 Bluetooth module.
 This project has been designed & constructed using power,
capacitor, resistor, PCB, LED , micro-controller IC, crystal,
voltage regulator IC, DC motor, motor driver IC, Bluetooth
module and android phone.
 Basically it is designed to move as per the command given
by the microcontroller.
 To move in all the direction like forward reverse right and
left,
the motor driver is also controlled by the microcontroller.

7. Development of Android app
Android is an open source operating system based on the
Linux kernel, and designed primarily for touch screen mobile
devices such as smart phones and tablets.

8. Forward
Left
backward
RightStop
Android Application view

9. CIRCUIT COMPONENTS
SL/N Name of components
01 ATmega8 microcontroller
02 L293D (Motor Driver IC)
03 Crystal
04 Voltage regulator 7805 IC
05 Hit sink
06 Battery
07 HC-05 Bluetooth module

10. CIRCUIT COMPONENTS
08 LED
09 Resistor
10 Switch
11 Capacitor
12 2 DC Motor
13 2 wheel
14 PCB board
15 Insulating board
16 Connecting Wire
17 Steering wheel

11. Bluetooth
Power
supply
Atmega8
micro
controller
L293D IC
Motor
Motor
Android
phone
with apps
Voltage
regulator
Basic block diagram of the
project

12. Outer look of the project

13. Circuit module

14. PCB layout

15. Circuit construction
 Power source is from battery.
 We designed the project with12V. But we supplied only 9.6 V.
However, it works properly.
 It is a combination of 8 battery. Each battery is 1.2 V.
 It has two terminals. Positive and negative terminals which
are connected to positive and negative terminal of PCB.
 Then we see a capacitor. It is the filter capacitor. It is
eliminate the ripple . Ripple is very harmful for system. Although
battery is pure DC.
 Other capacitors are also used to eliminate the ripple.

16.  Microcontroller is needed a minimum of 5 volt. Otherwise
it does not work properly.
 For this case we used a 7805 voltage regulator IC
which holds 5v.
 Pin 8 of L293D IC is connected with the source.
 For motor rotation it requires a minimum of 7.5 volt,
otherwise motor will not rotate.
 Pin 16 is connected to the output of 7805 IC for biasing.
 We used a Bluetooth. For Bluetooth 5v is needed. It is
connected with 5v positive and ground.
 TX , RX pins of microcontroller and Bluetooth are
connected. It is used to communicate with the
Circuit construction continued…

17.  At First we on the power switch and circuit gets power which is
indicated by LED.
 Then we have to connect Bluetooth module with the Android
phone.
 At Smartphone app, Bluetooth device is searched. If found
with name "HC-05" device, the connection is made with a pass
code “1234”. It must be paired.
 According to program:
 when we press forward button it goes ahead.
 If we press stop it stops.
 If we press Backward it goes to backward.
 If we press left it goes to left. it means it moves to left, and
vice versa.
Working procedure

18. FUTURE EXTENSIONS
Obstacle avoidance
Install Ultra sonic sensor.
Vision
Use camera to transmit frames back to android
application for display to user.
Bluetooth too low-bandwidth, switch to Wi-Fi.
18

19. Software
Proteus 8.
Code vision AVR.

20. ADVANTAGES
 Portable And Easy To Use.
 Easy to control.
 Simple In Construction.
 Easy To Maintain And Repair.
 Efficient And Low Cost Design.
 Low Power Consumption.
 The programming of the microcontroller is easy.

21. DISADVANTAGES
 It is time consuming project.
 It is use for short distance only.
 Rapidly power reduced.
 Bluetooth too low-bandwidth.

22.  We tried to control the robot by the smart phone, and
avoid the obstacle. that is why we designed an android
app. Which communicates with microcontroller via
Bluetooth module.
 In this project, We have gained the concept of embedded
C, designing app, Java environment. Which is important
for future development.
 We kept some additional parts such as buzzer, resistor,
LED, and rail connector/ bus bars in PCB. They are
Discussion

23. Conclusion
 It is feasible to implement Bluetooth communication
between Smartphone and microcontroller.
Microcontroller chip is not highly costly.
The development of apps for android in android SDK is easy
and free of cost.

24. QUESTIONS?