Re: one channel radio frequency help

robot guy wrote:
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.

Look at garage door openers, they use coder (usually set with bank of swithes) in transmitter AND receiver. When those two codes match an action is performed. But you have to have different music for every item that you want to respond to your orders.

Something to do.

HTH

Stanislaw
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