gsm controlled robot using micro controller

05/01/2023 GSM CONTROLLED ROBOTIC VEHICLE 1

GSM CONTROLLED ROBOTIC VEHICLE

GROUP 1: MOHAMMED NIHAL (14) SABAH MURSAL (22) KARTHIKA (10) SUDHEESH (37)

Guided By:Shekeela M.AAssistant ProfessorAE&I


CONTENTS Objectives Introduction Block diagram Description Circuit diagram Circuit description Components description Flow chart Work done Result and output References


OBJECTIVES

• The objective of our project is to design a

remote controlled robot (using cell phone as a

remote).

• The movement of the robot is done by sending

different commands from our cell phone.


INTRODUCTION

Wireless controlled robots use RF circuits , which have the drawbacks of limited working range , limited frequency range and limited control.

Use of a mobile phone for robotic control can overcome these limitations.

The control of robot involves three distinct phases: reception, processing and action.


Cont….

Generally, the receptors are sensed by IC HT9107B mounted on the robot.

Processing is done by the on-board microcontroller Atmega 16.

Task(movement to forward,backward etc.) is performed using motors or with some other actuators.

……………………


BLOCK DIAGRAM

POWER SUPPLY


BLOCK DIAGRAM DESCRIPTION

Cell phone act as a DTMF generator with tone depending upon the key pressed.

DTMF Decoder [IC HT9107B] decodes the received tone and gives binary equivalent of it to the microcontroller [ATmega16].


Cont…• The ATmega16 controller is programmed such

that appropriate output is given to Motor Driver IC L293D .

• IC L293D will drive the two DC Motors connected to it.

• So, ultimately the two motors rotate according to the key pressed on the keypad of the cell.


CIRCUIT DIAGRAM

05/01/2023 10

COMPONENTS REQUIRED: IC1 – HT9107B DTMF decoder

IC2 – ATmega16 IC3 - L293D motor driver

D1 - 1N4007 rectif ier diode R1 -330-kilo-ohm R2-10-kilo-ohm

R3 - 100-kilo-ohm R4-R8 - 10-kilo-ohm

C1,C2 – 100nF C3, C4– 1nF

XTAL1 - 3.57MHz crystal XTAL2 - 12MHz crystal

M1, M2 - 6V, 50-rpm geared DC motor

GSM CONTROLLED ROBOTIC VEHICLE


COMPONENTS DESCRIPTION

DTMF Decoder• HT9170 is the series of Dual Tone Multi

Frequency (DTMF) receivers.• HT9170 IC detects and decodes the 16 DTMF

tones into 4 bit output.• If tones are not detected, the four output bits

remain low.


Cont… ATmega16• The atmega16 is a 8-bit microcontroller, has 64 KB

Flash microcontroller with 1 KB RAM.• it provides the following features: 1. 64 KB of on-chip Flash program memory with ISP

(In-System Programming) and IAP (In-Application Programming) .

2. Four 8-bit I/O ports with three high-current Port 1 pins (16 mA each)

3. Three 16-bit timers/counters


Cont…

• Motor Driver IC L293D• L293D is a typical Motor driver or Motor

driver IC which allows DC motor to drive on either direction.

• L293D is a 16-pin IC which can control a set of two DC motors simultaneously in any direction.

• The L293D can drive small and quite big motors as well.


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 in the robot.


The received tone is processed by the ATmega 16 microcontroller with the help of DTMF decoder MT8870.

The decoder decodes the DTMF tone into it’s equivalent binary digit and this binary number is sent to the microcontroller.


The Atmega 16 microcontroller is programmed to take a decision to motor drivers in order to drive the motors for forward or backward motions 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.


Dual-Tone Multi-Frequency [DTMF]

DTMF Generator and Receiver• Here we use mobile phones as DTMF generator

and receiver.• One of the phone is used as a DTMF generator

which acts as a remote to control the vehicle. • The other phone acts as a receiver which receives

the DTMF tone and hand over it to the DTMF decoder IC.


Frequencies Corresponding to the Keys in a Telephone Keypad


• In the dial pad, the corresponding frequencies are associated with each key.

• Whenever a key is pressed two frequencies are generated.

• The resultant tone is the combination of the two frequencies generated.

• The frequency varies from key to key corresponding to the row and column in which the key is present.


• Each column and row has a frequency associated to it.

• For example, pressing the !1! key will result in a sound composed of both a 697 and a 1209 hertz (Hz) tone.

• These tones are then decoded by the switching center to determine which key was pressed.


DTMF Keypad Frequencies

Hz 1336 Hz 1477 Hz 1633Hz697 Hz 1 2 3 A

770Hz 41209 5 6 B

852 Hz 7 8 9 C

941 Hz * 0 # D


FLOW CHART


WORK DONE

• Design the required program.• Design the desired circuit to a bread board.• Downloaded the required software.• Converted program code to hex code


RESULTS AND OUTPUT

Successfully connected the circuit and verified the desired output


REFERENCE

o http://www.instructables.com/o http://www.alldatasheet.com/datasheet-pdf/pdf/

78532/ATMEL/ATMEGA16.html

http://www.instructables.com/


THANK YOU

gsm controlled robot using micro controller

Engineering