DTMF CONTROLLED ROBOTWITHOUT MICROCONTROLLER

Synopsis for Bachelor In Electronics and Communication Engineering

VALIA KOONAMBAIKULATHAMMA COLLEGE OF ENGINEERING & TECHNOLOGY ,CHAVARCODE,PARIPALLY

(P.0) THIRUVANATHAPURAM

UNDER THE SUPERVISION OF SABITHA MISS & ARYA MISS (ASSISTANT PROFESSORS)

NAME OF SCHOLARSJayasankar.S (Roll no 10)

Kiran Kumar.U (Roll no 13)Aswathy Azhakesh (Roll no 37)

Archana.S (Roll no 04)S6,2013-2017

INTRODUCTION

In this project ,we present the controlling of a robot using DTMF technique.

The robot is controlled by a mobile phone that calls the other mobile phone attached to the robot.

The above system can be used for military purpose as bomb detector, spy robot and also for surveillance.

There are various wireless modes like Bluetooth , Wi-Fi, etc..but these wireless controls has limitations in its control distance.

To overcome this limitation , mobile controlled robot is designed to add long distant wireless controllability to your robot.

This robot can be developed without microcontroller and hence it is very easy for the beginners to build it.

It provides the advantage of robust control, working range as large as the coverage area of the service provider.

All robots share the feature of a mechanical, movables structure under some form of control.

Important components Robot chassis Motors Breadboard IC L293D IC MT8870 Crystal Oscillator Resistors Capacitors Headphone jack Wires Batteries

PIN DIAGRAM SPECIFICATION

Block diagram

• Circuit diagram of DTMF controlled robot without using microcontroller

How it works? In mobile controlled robot ,we use two mobile

phones.This robot is controlled by a mobile phone that

makes a call to another mobile phone attached to the robot.

When the user calls the mobile which is mounted on the robot the call is received by auto –answer mode.

In the course of a call, if any button is pressed, a tone corresponding to the button pressed is heard at the other end of the call.

A DTMF telephone keypad

This tone is called “ Dual Tone Multi Frequency ( DTMF)” tone.

The robot receives this DTMF tone with the help of headphone attached to the robot.

The received tone is processed by the DTMF Decoder IC ,and then transmits the signal to the motor driver IC to operate the motors.

The motor driver L293D can control 2 motors bi-directionally and has 4 inputs.

The 4 outputs from the decoder IC is fed into the 4 inputs of the motor driver directly .

Now , call will be in progress between first and second mobile phones.

Take the keypad in the first mobile phone and press the numbers.

If ‘1’ is pressed ,one motor will rotate in a direction . If ‘2’ is pressed ,that motor will rotate in opposite

direction. If ’3’ is pressed motor will stop rotation .Press ‘4’ and ‘8’ for rotating the other motor.Now press ‘5’ so that the robot starts moving

forward.While pressing ‘0’ robot moves backward.

Prototype

Advantages

• This robot can be virtually controlled anywhere from the world

• Easy to set up• No microcontroller and no tough coding

Disadvantages• Requires a camera to maneuver your house or

office when you are far away from the robot• Call charges will be deducted according to the

service provider plans when you control the robot.

Applications• Can be used in military for disposing land

mines.• Best suited for search and rescue operations.• Addition of wireless camera helps to access this

robot from any part of the world to monitor your house or office.

Thank you !!