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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hantto: Not hard at all using some off the shelf components. Have a look at the HT12E and HT12D. The 'E' is an encoder for RF transmitters, encodes binary and an address. 'D' is a decoder and takes a signal from a Receiver and decodes that if the address matches what is set on the pins. The output is binary and can easily interfaced into a circuit.
The RF transmitter/receiver could be the following units:
**broken link removed**
I built a circuit using these and very few other components, the range using a 1/4 wave aerial is up to 50M indoors and 250M outdoors LOS.
So the answer is, it's as difficult as you can make it.
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