Final Report

A
MINOR PROJECT
DTMF CONTROLLED ROBOT
Submitted by:-
AKSHI JAIN-9912102286
VINAMRA JHA-9912102295
SANIL JAIN-9912102301
Under the Guidance of
MR. PUSHPENDRA SINGH
Jaypee Institute Of Information
Technology, Noida

ACKNOWLEDGEMENT
I would like to place on record my deep sense of gratitude to faculty,
Jaypee Institute of Information Technology, Noida for their generous
guidance, help and useful suggestions.
I express my sincere gratitude to Prof. Pushpendra Singh, Dept. of
Electronics & Communication Engineering, Jaypee institute of
information technology, Noida , for his stimulating guidance, continuous
encouragement and supervision throughout the course of present work.
I also wish to extend my thanks to Prof. Deeksha Chandola & Prof.
Abhishek Khanna and our seniors for their insightful comments and
constructive suggestions to improve the quality of this project work.

TABLE OF CONTENTS
1:Components used
2: Arduino
3. Chassis & Wheels
4. Motors
5. ICs
6. Circuit Diagram
7. Dtmf controlled robot
8. How robot works
9. Flowchart
10. Code
11. Refrences

Components Used:
• 1 Arduino board
• DTMF chip
• 4 DC motors
• 4 Wheels
• 1 platform for robot
• Connecting wires
• Bread Board
• 1 Motor Driver
• 2 GSM Mobile Phones

What is Arduino?
• Arduino is a tool for making computers that can sense and control more of
the physical world than your desktop computer.
• Arduino is an open-source electronics prototyping platform based on
flexible, easy-to-use hardware and software.
• An Arduino board consists of an 8 bit Atmel AVR microcontroller with
complementary components to facilitate programming and incorporation
into other circuits.

The chassis needs to hold four motors, circuit and the power supply. It is made
using a wooden plank. The robustness and flexibility of the robot depends on
the chassis. We have used hardboard for chassis.
 The wheels are a crucial part of the robot as they must be very precise in
their size for the straight motion of the robot. So, we have used 4 wheels
for main locomotion.

MOTORS:
Motors are being used for the locomotion..
 While choosing a motor for locomotion, one must keep a few things in
mind. We need to look for motors with low voltages and higher current
ratings. This holds true for unipolar as well as bipolar motors.

Ics :-
L293D is a dual H-bridge motor driver integrated circuit (IC). Motor drivers act as
current amplifiers since they take a low-current control signal and provide a
higher-current signal. This higher current signal is used to drive the motors.

CIRCUIT DIAGRAM
DTMF Controlled ROBOT
DTMF is a signaling system for identifying the keys or better say the number
dialed on a DTMF keypad. The early telephone systems used pulse dialing or loop
disconnect signaling. This was replaced by multi frequency (MF) dialing. DTMF is a
multi frequency tone dialing system used by the push button keypads in
telephone and mobile sets to convey the number or key dialed by the caller.
DTMF has enabled the long distance signaling of dialed numbers in voice
frequency range over telephone lines.

DTMF Mobile ROBO is a machine that can be controlled with a mobile. In this
project, the robot is controlled by a mobile phone that makes a call to the mobile
phone attached to the robot. 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.
This tone is called "Dual Tone Multiple-Frequency" (DTMF) tone. The robot
perceives this DTMF tone with the help of the phone stacked on the robot. The
received tone is processed by the Arduino with the help of DTMF decoder. The
Arduino then transmits the signal to the servo motors & our robot starts moving.
HOW BOT IS WORKING?
In this project the robot, is controlled by a mobile phone that makes call to the
mobile phone attached to the robot. In the course of the call, if any button is
pressed control corresponding to the button pressed is heard at the other end of
the call. This tone is called dual tone multi frequency tone (DTMF), robot receives
this DTMF tone with the help of phone stacked in the robot
The received tone is processed by Arduino with the help of DTMF decoder
MT8870. The decoder decodes the DTMF tone in to its equivalent binary digit and
this binary number is send to the Arduino, the Arduino is preprogrammed to take
a decision for any given input and outputs its decision to motor drivers in order to
drive the motors for forward or backward motion or a turn.
The mobile that makes a call to the mobile phone stacked in the robot acts as a
remote. So this simple robotic project does not require the construction of
receiver and transmitter units.
The version of DTMF used for telephone dialing is known as touch tone .
DTMF assigns a specific frequency (consisting of two separate tones) to each key s

that it can easily be identified by the electronic circuit. The signal generated by
the DTMF encoder is the direct al-gebric submission, in real time of the
amplitudes of two sine(cosine) waves of different frequencies, i.e. ,pressing 5 will
send a tone made by adding 1336hz and 770hz to the other end of the mobile.

CODE
int a,b,c,d,e;
Servo left; Servo right;
void setup()
{
pinMode(8,INPUT);
pinMode(9,INPUT);
pinMode(10,INPUT);
pinMode(11,INPUT);
pinMode(7,OUTPUT);
pinMode(6,OUTPUT);
pinMode(5,OUTPUT);
pinMode(4,OUTPUT);
// Serial.begin(9600);
}
void loop()
{
d=digitalRead(8);
c=digitalRead(9);
b=digitalRead(10);

a=digitalRead(11);
e=(1*d)+(10*c)+(100*b)+(1000*a);
//Serial.println(e);
switch(e){
case 10://BOT FORWARD when 2 is pressed
digitalWrite(7,HIGH);
digitalWrite(6,LOW);
break;
case 100://BOT LEFT when 4 is pressed
digitalWrite(4,LOW); break;
case 110://BOT RIGHT when 6 if pressed
digitalWrite(4,HIGH); break;

case 1000://BOT BACKWARD when 8 if pressed
digitalWrite(4,HIGH); break;
case 101://BOT STOP when 5 is pressed
digitalWrite(4,LOW); break;
}
delay(1000);
}

REFERENCE
1. HTTPS://WWW.GOOGLE.CO.IN/SEARCH
2. www.ti.com/lit/ds/symlink
3. HTTP://EN.WIKIPEDIA.ORG/WIKI

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