I could use some input on this subject. A while ago I used infared led's hooked up to a 555 to flash at a certain speed, I can't remember what speed it was but I then had some special little divice that when it saw an infared flashing at one specific givin speed it would either close a switch completing the circuit, I can't quite remember how I wired it but any way I'd like to do the same with a radio. What I want it to do is turn on and led first than move on to turning on ovens, unlocking cars etc... I have a good idea how to do it, just take a transmiter and pulse it at a certain speed with a 555 but how do I get my reciever to only regonize that certain speed, a filter, a tone detector? I could really use some input or websites to look at.
- posted
16 years ago