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Automatic control of fan and light

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As a part of my class project ,i wish to do an automatic control of light and fan.It means when no one in the room ,all bulbs and fans will be off..



i wish to do it with 4 pir sensors [placed on 4 diffrent places in a room] and pic16f84....

when all the sensor output is low,the main relay shuld open and cut the current......

when any one of the sensor output is high [means someone in room] ,curresponding fan should on...

when 2 sensor output is high ,both the fan should on .......and so on....

I don't know to program my pic16f84...so plz help me to program my pic...if you know the source code plz post it......
 
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