GREATER NOIDA INSTIOTUTE OF TECHNOLOGY

CONTROLLING HOME APPLIANCES USING TV

REMOTE Submitted by:

Arpit SinghAnuj Tiwari

Ambar GuptaEC-A

TABEL OF CONTENTS:

INTRODUCTION BLOCK DIAGRAM CIRCUIT DIAGRAM CIRCUIT DESCRIPTION REQUIREMENTS APPLICATIONS ADVANTAGES

INTRODUCTION

The aim of this project is to design a circuit such that one can control home or industrial appliances using the help of remote.

Home Appliance Control System accessed by TV remote to allow a home members to control, monitor and coordinate home appliances.

This circuit can be operated upto a distance of 5-10 metres depending upon the remote which we use.

BLOCK DIAGRAM

CIRCUIT DIAGRAM

REQUIREMENTS Step-down transformer Voltage regulator Ics Capacitors(electrolytic(1000uf,220uf) and ceramic(.01uf)) Resistors (330ohm, 10k,1k) Diodes, LEDs , seven segment display Connecting wires, Reset Pin Crystal oscillator(11.09mhz, 12 mhz) Tv remote, IR receiver( IRX1 TSOP1738), IR decoder Microcontroller (AT89C2051) Relay Driver IC( ULN 2803) 6 Relays, Sockets Software used BASCOM IDE UNIVERSAL PROGRAMMER Appliances

POWER SUPPLY CIRCUIT

IR TRANSMITTER

The IR transmitter used in the circuit is a TV remote.

Remote that follows RC5 Protocol is being used in this circuit.

As per this, IR signals from the remote are modulated by a carrier frequency of 36 kHz.

IR RECEIVER

The IR receiver in the circuit is TSOP 1736. These are capable of receiving pulsed IR rays of 36 kHz only and can receive no other frequencies.

It receives the signals from the transmitter and retrieves the original modulating signal from the 36 kHz carrier

IR DECODER The microcontroller AT89C2051 is used as the IR

decoder in the circuit. It is flashed with a program that decodes the RC5

Protocol. It is designed to control the inputs and outputs. The

demodulated output from the receiver will be sensed and decoded using this microcontroller.

Thus it helps to determine which device is being operated by the user.

RC-5 PROTOCOL The RC-5 protocol was developed by Philips in the

late 1980s as a semi-proprietary consumer IR (infrared) remote control communication protocol for consumer electronics.

The advantage of the RC-5 protocol is that (when properly followed) any CD handset (for example) may be used to control any brand of CD player using the RC-5 protocol.

RELAY DRIVER IC IC ULN2803 consists of octal high voltage, high current

Darlington transistor arrays. The eight NPN Darlington connected transistors in this family of arrays are ideally suited for interfacing between low logic level digital circuitry (such as TTL, CMOS or PMOS/NMOS) and the higher current/voltage requirements of lamps, relays etc.

The main features ofULN2803 are: Eight Darlington’s with Common Emitter. Open–collector outputs. Output Current to 500 mA. Output Voltage to 50 V.

RELAYS A relay is an electrically operated switch. It allows

one circuit to switch a second circuit which is completely separated from the first.

For example a low voltage battery circuit can use a relay to switch a 230V AC mains circuit.

There is no electrical connection inside the relay between the two circuits, the link is magnetic and mechanical.

ADVANTAGES Portable and easy to use. Simple in construction. Easy to maintain and repair. Efficient and low cost design. Low power consumption.

APPLICATIONS This system can be used in industrial applications This system reduces human efforts and makes life a bit

easy without compromising on the efficiency of appliances.

Using this system one can also save time.

FUTURE MODIFICATIONS The circuit can be modified to control all functions

of a particular device like the TV remote controlling all processes of a television.

Also the program can be altered to control the ON/OFF processes of more than SIX appliances.

.

CONCLUSION Hereby we come to an end of or project “remote

controlling of home appliances”. This project gives us an idea of RC5 Protocol and the microcontroller AT89C2051.

This project can be used anywhere either at home or offices.

This is also cost efficient. Thus by this attempt of ours the ON/OFF processes of many devices was successfully carried out by just using a TV remote.