[App_rpt-users] GPIO fan control

K&R Yoksh yokshs at gmail.com
Wed Jan 25 23:20:47 EST 2012

Hello all,

I considered doing this on my nodes, but didn't want to have a relay or fan 
wear out by cycling on each PTT. I tried using the
connpgm and discpgm in rpt.conf to enable the fan during connections, and 
disable afterwards, but it was not very effective.

I'd really like to find a fan control script like what I used on EchoIRLP... 
Something that activates by PTT, and keeps the fan going for X seconds 

I have multiple GPIO lines available on my parallel port, and still have the 
fan control hardware that I built for my EchoIRLP station here. At this 
the fan is just running 24 x 7.

Maybe someone can come up with such a script? My bash is pretty crude.



--- Original Message ---

>> Has anyone used the GPIO lines on a URI to active a 12 volt DC fan when
> the PTT is active?
>> I have a friend that who wants to implement this on his All-star node to
> keep his transmitter cool.
>> I guess that we would need to use a relay with the GPIO line to protect
> the URI?
>> Any thoughts or suggestions?
>> Marshall - ke6pcv
> Marshall,
> I had the same idea and I contacted David Kramer at DMK Engineering 
> (makers
> of the URI).
> He responded with this link on how to do exactly what you want;
> http://www.dmkeng.com/images/GPIO_Relay.pdf
> I tried it and it works great....
> 73,
> Neil

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