A

Mini project Report

On

Wireless Robot with DTMF

Submitted in partial fulfillment of the requirement for the award of the degree of

BACHELOR OF TECHNOLOGY

In

ELECTRONICS & COMMUNICATION ENGINEERING

Submitted by

Jawed Akhter. 117B1A0455

Under the guidance of

Asst.Prof. Ms.Alavelu

Certificate

This is to certify that this dissertation work entitled “Wireless Robot with DTMF” is a Bonafide work carried out by Jawed Akhter (117B1A0455) in partial fulfillment of the requirements for the award of the degree of Bachelor of Technology in ELECTRONICS AND COMMUNICATION ENGINEERING, from “Sagar Institute of Technology”, during the period 2014 under the guidance and supervision.

Asst.Professor Ms.Alavelu Mr. K.Srishylam

Internal Guide (M.Tech,MISTE,AMIE,AMIETE)

Head of the Department

.

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DECLARATION

We hereby declare that the project “Wireless Robot With DTMF” submitted in the partial

fulfilment of that requirements for the award of the degree of bachelor of technology in

electronics and communication engineering from SAGAR INSTITUTE OF ENGINEERING

AND TECHNOLOGY, CHEVELLA, affiliated to JNTU, Hyderabad is an authentic work and

has not been submitted to any other university/institute for award of degree.

Jawed Akhter. 117B1A0455

Department of E.C.E

Sagar Institute of Technology.

Date:

Place: Signature

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ACKNOWLEDGEMENT

With great pleasure we want to take this opportunity to express our heartfelt gratitude to all the people who helped in making this mini project work a grand success.

We are grateful to Mr. K.Srishylam (M.Tech,MISTE,AMIE,AMIETE) . Professor & Head of Electronics and Communication Engineering department, SITECH. And Ms Alavelu, Project Assistant, for their valuable suggestions and guidance during the execution of this project and also for giving us moral support throughout the period of our study in SITECH.

We are also highly indebted to our Principal Dr.P.V.K Murthy , for giving us the permission to carry out this mini project.

We would like to thank the teaching and non-teaching staff of ECE Department for sharing their knowledge with us.

Last but not the least we express our sincere thanks to Dr.W.R.Reddy and all the founders of Sagar Institute of Technology for their continuous care towards our achievements.

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Abstract

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 microcontroller with the help of DTMF decoder. The microcontroller then transmits the signal to the motor driver ICs to operate the motors & our robot starts moving.

Conventionally, Wireless-controlled robots use RF circuits, which have the drawbacks of limited working range, limited frequency range and the limited control. Use of a mobile phone for robotic control can overcome these limitations.

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 tome (DTMF) robot receives this DTMF tone with the help of phone stacked in the robot. The received tone is processed by the atmega16 microcontroller 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 microcontroller, the microcontroller is preprogrammed to take a decision for any give 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. DTMF signaling is used for telephone signaling over the line in the voice frequency band to the call switching center. The version of DTMF used for telephone dialing is known as touch tone.

Key words: DTMF

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INDEX

CONTENTS PAGE NO

Certificates ii

Declaration iii

Acknowledgements iv

Abstract v

Index vi

List of figures

List of tables

List of abbreviations

Chapter 1: Introduction -----------------------------------------------------------------------------------

1.1 Introduction 1.2 Aim of the project 1.3 Block Diagram.

a. Transmitter Section b. Receiver Section

1.4 Circuit Dig. 1.5 Component List1.6 Conclusion

Chapter 2: Micro Controller-8051 ------------------------------------------------------------------------

2.1 Introduction2.2 Important features and applications2.3 External Links2.4 Brief Description of Micro Controller-80512.5 Pin Diagram 2.6 Pin Diagram description2.7 Block Diagram2.8 Special functions register2.9 AT89S52 Types of Memory

2.10 Conclusion

Chapter 3: Power Supply

3.1 Introduction