[App_rpt-users] GPIO fan control

Tim Sawyer tim.sawyer at me.com
Thu Jan 26 00:19:40 EST 2012

It should be possible to set a bit on the parallel port which follows PTT with the events management system. 

see http://ohnosec.org/drupal/node/176

I've not tried this but something like this might work:

In rpt.conf
cop 62, PP03 = c|e|${RPT_TXKEYED}

A USB node would be needed with a PP03 = out0 in the chan config:
In simpleusb.conf or usbradio.conf
PP03 = out0


On Jan 25, 2012, at 8:20 PM, K&R Yoksh wrote:

> 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 afterwards..
> 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 point,
> the fan is just running 24 x 7.
> Maybe someone can come up with such a script? My bash is pretty crude.
> 73
> Kyle
> K0KN
> --- 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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