This document describes the design and functioning of a multi-directional metal detection robot (MDR). The MDR uses wireless communication to detect metals in multiple directions. It has four wheels for movement in any direction and a metal detector coil to identify metals based on the phase shift of the induced magnetic field. The MDR is remotely controlled using a PC and transmits detection results and movement status via wireless communication. It has potential applications in risky environments like mines to detect metals.

1. Presented by
Venkata Bhavana. P
12C51A0458
Sahithi. V
12C51A0477
SAI SPURTHI INSTITUTE OF TECHNOLOGY

2. Contents
 Introduction
 Existing state
 Construction
 Working
 Metal detection
 Applications and future
scope
 Conclusion

3.  Robotics will play a vital role in our daily
applications.
 Robot may be either guided or
autonomous.
 The mechanical Structures are interfaced
to electronics circuit to drive the robot.
 In general robot is controlled by using
flash magic software.

4.  Now a days, we use metal detecting robots
which will twist total structure to change its
direction
 This may be give unfruitful result for low
space and uneven surface conditions

5.  In order to overcome the above
disabilities, using sophisticated
technology a multi directional metal
detection robot(MDR) was constructed

6. Block diagram
Transmission section includes a personal
computer which contains a code and ZigBee
which is a transceiver and acts as a wireless
communication channel of range 100mts.
pc ZigBee ZigBee mc
MD
LED
Motor
Buzzer
TRANSMITTER RECIEVER

7.  A metal detector, LED, motor L293D,
buzzer are interfaced with receiver
The micro controller will enable the motor
driving circuit to traverse the MDR
accordingly
 Receiver section consists of another ZigBee
which sends data to micro controller
(89S52)
Fig.4 Top view of the MDR

8. Fig . 1 Simulation Circuit diagramof the Receiver

9. Communication
 MDR was constructed in a square shape
using noncorrosive material
 It was guided remotely using wireless
communication
 Between MDR control unit and control room,
low power short range communication is
established

10. Hyper terminal
 Hyper terminal is a program that records the
messages passed to and from PC to the
receiving circuit
 Commands can be sent to MDR directly via
hyper terminal
 Hyper terminal is configured with baud rate
of 9600

11. Fig. 9 Messages at hyper terminal
The state of execution will be resend to
hyper terminal as a command ‘X’ for
successful execution and ‘E’ for an error

12. Wheels arrangement
 Five number of 100 rpm DC motors are
used, out of which 4 are used to control the
movement of 4 multi directional wheels
 One DC motor is located at the center point
to transmit the signals

13. Gear assembly of MDR
 To fix the motion and direction of MDR ,
heavy duty plastic gear assembly is used
Fig.2 Gear assembly of MDR (Bottom View)

14. METAL DETECTOR
 Round shaped concentric coil is used for
MDR
 EMI principle is adapted by applying AC to
coil which induces EMF
 The magnetic field of coil is used to detect
the metal objects
 Due to this current is influenced on the metal
resulting generation of opposite current
Fig.5 Concentric coil metal detector view
Fig.3 MDR Structural front view
1
2

15.  A transmitter acts as a source ahead for
which operating frequency depends upon
current flow
 This current flow causes change in
magnetic field
 When it is sensed by the metal, it will
induce current itself and produces magnetic
field opposite polarity
 The current flow in the receiver coil gets
amplified and processed
 The resulting signal at the receiver coil is
having phase shift with the transmitter coil

16.  Large phase shift occurs for metals like
gold, copper, silver etc.
 Kind of metal identified is based upon
phase shift
 Small phase shift occurs for less conductive
and thinner objects

17. Signal transmission
 An IR transmitter is equipped to shaft of
motor and 8 IR receivers are positioned
surroundingly
 IR transmitter emits radiations continuously
which will received by receiver
 The amount of IR signal hitting the receiver
will be measured in terms of its output
voltage of receiver

18.  The angle of MDR motion is determine based
on control points
 The traverse directions are determined by
considering the transmitter located at the
center position of robots
Fig .7 An approach to find the angle for diagonal
traverse of the robot.

20.  This model is best suited for finding the
conductive metals like gold, nickel, silver etc.
at risky locations
 The intensity of emitted EM rays can detect the
conductive material limited to closer objects
 MDR may use in seismology to find the metal
content in the available minerals
 In future the developed is powered with
knowledge based system so that classification
of metals can be accurately determined

21.  Thus by using MDR, we can detect the type
of metal with multi directional movement
using remote control
 The developed working model needs to be
powered with collision avoid mechanism in
order to safe guard it from other obstacles in
opposite direction