[App_rpt-users] GPIO fan control

Andrew Errington a.errington at lancaster.ac.uk
Fri Jan 27 01:41:32 EST 2012


On Fri, January 27, 2012 12:43, K&R Yoksh wrote:
> I forgot to mention that I've also had good luck assigning multiple
> Parallel
> port pins to PTT in usbradio.conf or simpleusb.conf, such as:
>
> pp3 = ptt pp4 = ptt
>
> Again, I'd rather not cycle a relay with every PTT. I'd much prefer the
> fan run for 2 minutes or so after the last PTT, then shut off. That would
> save a lot of wear and tear on the fan and relay.

How about a 555 timer IC hooked up to PTT in one-shot mode with a 2 minute
timer?

Very old skool, but might do the job.

73,

Andrew
ZL3AME




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