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Remote controller uses NEC protocol

Today almost anything has remote control ability, If few years ago mostly we could control TV, stereo, so today it is normal to turn on lights, close blinds, adjust heater and many other things using remote. But there will always be something what requires direct control. But if you like to improve things your way, why not making you life easier with another remote. Gaurav has build a remote control relay board some time ago. But it seems that it needed a remote controller itself. So he started another project where he paired this board with DIY remote. Remote controller works with NEC encoded commands. This standard is described pretty well in project page. The schematic is really simple – PIC12F615 microcontroller which drives IR LED through transistor key. Five push buttons are connected directly to microcontroller with internal pull-up resistors enabled (just one need external resistor). Remote controller is powered with 3V cell coin battery and seems to be last long enough because microcontroller most of time spends in sleep mode. Continue reading