Multi directional conductive metal detection robot

Presented by

Venkata Bhavana. P12C51A0458

Sahithi. V12C51A0477

SAI SPURTHI INSTITUTE OF TECHNOLOGY

Contents Introduction Existing state Construction Working Metal detection Applications and

future scope Conclusion

INTRODUCTION 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.

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

EXISTING STATE

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

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.

CONSTRUCTION

pc ZigBee ZigBee mc

MDLEDMotorBuzzer

TRANSMITTER RECIEVER

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

Fig . 1 Simulation Circuit diagram of the Receiver

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

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

Messages at hyper terminal

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

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

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)

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

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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

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

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

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

Angle finding method

Fig .7 An approach to find the angle for diagonal

traverse of the robot.

Multi directional movement of MDR

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

Applications and Future scope

Conclusion

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

QUERIES???