Sometime ago i had an idea in my mind about a DIY wireless link between, say, two MCUs. But the point is that i never tested it. I just wanted to know what you thought about it and if you think it could work (you are the electronic gurus after all :) )
It should work like this.
-Receiver has the antenna attached to the base of a darlington, and the signal received goes to the MCU (if not enough maybe i could make a bigger darlington, maybe three NPNs)
-Sender has an antenna attached to a high output pin of an MCU (or connected via a transistor to increase current). This signal is pulsed at 38kHz (just an example)
Now, the receiver would need some software way to decode the signal which is "encoded" at 38kHz. What i thought about is counting the pulses received to determine the frequency (to see if it is acceptable or not) and then try to decode the signal by counting how much the input stays HIGH or LOW.
Problem is: i guess with this setup you would need a common ground. And that's a big problem :)
What do you think about it?