OT-- need plans for a wireless switch

From: Bryan Blackburn <oldcomp_at_cox.net>
Date: Thu Jul 17 16:54:00 2003

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_at_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
Received on Thu Jul 17 2003 - 16:54:00 BST