Home Appliance Control using RF Remote

Abstract

The project is designed to operate electrical loads using a RF remote. The remote

transmits coded infrared data which is then received by a sensor interfaced to the control unit.

The system operates electrical loads depending on the data transmitted from the RF remote.

Operating conventional wall switches is difficult for elderly or physically handicapped people.

This proposed system solves the problem by integrating house hold appliances to a control unit

that can be operated by a RF remote coded data sent from the RF remote is received by an RF

receiver interfaced to the microcontroller of 8051 family. The program on the microcontroller

refers to the code to generate respective output based on the input data to operate a set of relays

through a relay driver IC. The loads are interfaced to the control unit through the relays. The

system can be used in existing domestic area for either operating the loads through conventional

switches or with the RF remote .The project can be used by using radio frequency technology

where the operational range shall be independent of line of sight distance as often encountered

with RF type of remote control.

BLOCK DIAGRAM

RF Driver Unit

Control devices

Relay UnitRF

ReceiverMicro

Controller

Key PadRF

Transmitter

Circuit Diagram

Receiver

Software

ORCAD 9.1- Circuit Design

Ride 7 - Compiler

Transmitter

Program

* Processor: AT89C52

* Compiler: Keil for 8051

*/

#include <reg51.h>

#include <stdio.h>

#define OFF 0

#define ON 1

#define RData P1

sbit Fan=P2^0;

sbit Light=P2^1;

void Delay(unsigned int D)

{

while(--D);

}

void main(void)

{

// Write your code here

Delay(100);

Fan=OFF;

Light=OFF;

RData=0xFF;

while (1)

{

switch(RData)

{

case 0xFE:

Fan= ON;

Delay(100);

break;

case 0xFD:

Fan=OFF;

Delay(100);

break;

case 0xFB:

Light=ON;

Delay(100);

break;

case 0xF7:

Light=OFF;

Delay(100);

break;

default:

Delay(100);

break;

}

}

}