I second the motion! Use an IR link! Use of a frequency selective IR
Tx/Rx system will prevent unwanted keying of your transmitter, and if it
is anything like the ones I have built, the reflected signal will be
enough to make it work (no need to be line of sight).
Using RF to create a link is asking for trouble, not to mention a lot
more work. Check FCC regs, this is considered remote transmitter
control. If you choose to go RF, use a coded transmitter similar to a
remote entry key, not a PL based one, since even that is susceptible to
interference. Holtek makes a few Tx/Rx chips with digital coding. You
can buy the chips at
digikey.com. (But don't use them! Go IR!)
-Bryan
Tothwolf wrote:
On Mon, 14 Jul 2003 nerdware(a)ctgonline.org wrote:
My next thought is to use the aircraft button, but
with a tiny
transmitter/battery mounted on the wheel, with a receiver mounted under
the steering column with a keying relay. Hit the button, the relay
turns on, let up, the relay releases.
Perhaps a near-IR LED with a 555 and a 9V battery would work for the
"transmitter"? Somewhere I have some plans filed away for something
similar. Depending on the output of the LED, and sensitivity of the IR
transistor used by the detector circuit, you might not be able to key
while making a turn, but then how often would you need to do that?
-Toth