Re: RF modules with encoding?

Spehro Pefhany <speffSNIP@xxxxxxxxxxxxxxxxxxxxxxx> wrote in
news:qp0a83pssr3vgs1q12leq41rikha04ka85@xxxxxxx:

Hi, all:-

I'm looking for a small, and low power, pair of RF modules (send and
receive, only one-way communication) that could be used to send a
couple of messages (specifically, "ON" and "OFF" commands) with
encoding so that stray RF won't cause it to malfunction (the
consquences are expensive, and possibly even dangerous). Maybe
something in the ISM band. If the transmitter works off a key fob with
a button cell, all the better. It would be nice if there was no local
oscillator or other leakage of signals from the receiver. There will
probably be a number of receivers and a single transmitter. Range is
not an issue (a few dozen meters is fine).

It doesn't have to be really secure against deliberate attempts to
spoof the code, just against accidental actuation.

Any suggestions?


Best regards,
Spehro Pefhany

I have heard of some (like Holtek perhaps), although they do no more
than gate the carrier on and off based on the logic you feed them, and
present a signal at the receiver based on the status of that logic
signal entering the trasnmitter. Error correction and that would be don
by the logic you supply on either side. That said, you could use simple
remote control transmitter chips or a micro in the trasnmitter, and a
micro to decode, if no direct decoder IC is available..

.