g Project

CELL PHONE BASED DTMF CONTROLLED GARAGE DOOR OPENING SYSTEM.

Prepared By:ImtinunglaEsther KathAntaripa Bhuyan

OUTLINES : Introduction. Overview. Design. Flow chart of the project Components Used

DTMF.MicrocontrollerDC Motor (PM Motor) Power Supply

Circuit Description Working Future scope. Bibliography.

OUTLINES :Introduction. Overview. Design. Flow chart of the project. Components Used. Future work. Bibliography

INTRODUCTION

Objective of this project is to unlock a garage door by a mobile phone.

Based on the concept of DTMF (dual tone multi - frequency).

Further this project can be incorporated with an EEPROM i.e., a non-volatile memory.

OUTLINES : Introduction.Overview. Design. Flow chart of the project. Components Used Future work. Bibliography.

OVERVIEW:

The system consists of DTMF decoder, Microcontroller,DC motor (PM motor),Cell phone to achieve our goal.

OUTLINES :

Introduction. Overview.Design. Flow chart of the project. Components Used. Future work. Bibliography.

Design :

OUTLINES : Introduction. Overview. Design.Flow chart of the project. Working Future work. Bibliography.

OUTLINES :

Introduction. Overview. Design. Flow chart of the project. COMPONENTS USED. Future work. Bibliography.

DTMF : DTMF is a common communication term for touch tone

phones.

16 button keypad.

DTMF DECODER: This DTMF decoder

circuit identifies the dial tone from the telephone line and decodes the key pressed on the remote telephone.

MICROCONTROLLER : 8K Bytes of In-System Programmable (ISP) Flash

Memory 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Full Duplex UART Serial Channel

SCHEMATIC PIN OUT

POWER SUPPLY UNITTransformerRectifierVoltage

Regulator

TRANSFORMERThe 230V AC supply is first

stepped down to 12V AC using a step down transformer

RECTIFIER The rectifier converts the AC to DC

Fig: Bridge Rectifier

VOLTAGE REGULATOR(78050) The AC ripples is filtered

out by using a capacitor and given to the input pin of voltage regulator 7805.

At output pin of this regulator we get a constant 5V DC which is used for MC and other ICs in this project.

RESISTORS AND CAPACITOR 330r 10K 330K 100K 22K

470uF 10uF 33pF 0.1uF .47uF 22pF

RESISTOR CAPACITOR

LED For indication of the dialed numbers.

DC MOTOR IC (L293D) 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.

DC MOTOR

Initiates the opening and closing of the door.

SOFTWARE REQUIREMENT:

Keil C compilers-Compiles HLL Language(like c ,java),creates hex file.

ECE Flash Magic- for dumping the program into the microcontroller

Circuit Description

& Working.

CIRCUIT DIAGRAM

WORKING The DTMF Decoder(MT8870) with a 3.5 MHz Crystal

compares the input tones and converts in into binary form that is acceptable by the microcontroller.

This BCD data is passed through HEX CMOS inverters (74LSO4) the output of which are duly pulled up and connected to port-1 pin no 1 to 4 as buffer between the DTMF IC and the MC.

Thus the microcontroller gets the 4 bit binary data and while i.e. executed by the program develops corresponding output at pin 26, 27&28 of part 2 for the motor driver IC L293D to rotate as desired for opening or closing the door motor.

An SPDT limit switch is used the common point of which is connected such that while the motor shaft reaches one extreme end the limit switch provides a logic zero that are connected INT0 & INT1 i.e. pin 12& 13 of microcontroller, to stop the motor so that locked rotor condition is avoided.

OPENING CLOSING

SPECIALTY OF THE PROJECTCan be controlled from any part of

the world.Time saving. Easy to use

Future work• The system can be improve our system

• first by using a sensor to check the status of the door before applying the user’s order• then by making the system send a message to the user to confirm the success of the process,

BIBLIOGRAPHYTEXT BOOKS REFERED: 1. “The 8051 Microcontroller and Embedded

systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi , Pearson Education.

2. ATMEL 89S52 Data Sheets.

WEBSITES www.atmel.com www.beyondlogic.org www.wikipedia.org www.howstuffworks.com www.alldatasheets.com