DTMF MOBILE CONTROL ROBOT

1. DTMF CONTROLLED ROBOT
WITHOUT MICROCONTROLLER
Synopsis for
Bachelor In Electronics and Communication Engineering
VALIA KOONAMBAIKULATHAMMA COLLEGE OF
ENGINEERING & TECHNOLOGY ,CHAVARCODE,PARIPALLY
(P.0) THIRUVANATHAPURAM

2. UNDER THE SUPERVISION OF
SABITHA MISS & ARYA MISS
(ASSISTANT PROFESSORS)
NAME OF SCHOLARS
Jayasankar.S (Roll no 10)
Kiran Kumar.U (Roll no 13)
Aswathy Azhakesh (Roll no 37)
Archana.S (Roll no 04)
S6,2013-2017

3. 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.

4. 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.

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

6. PIN DIAGRAM SPECIFICATION

7. Block diagram

8. • Circuit diagram of DTMF controlled robot without using microcontroller

9. 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.

10.  A DTMF telephone keypad

12. 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 .

13. 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.

14. Prototype

15. Advantages
• This robot can be virtually controlled
anywhere from the world
• Easy to set up
• No microcontroller and no tough coding

16. 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.

17. 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.

18. Thank you !!