Seems like an awful lot of work when you can just use a thermal relay bolted or thermal epoxied to the heat sink of whatever you are trying to cool. When it gets warm it turns on and when it cools down it turns back off. I use Digitkey part # 317-1094-ND on all of my repeaters. -----Original Message----- From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of Tim Sawyer Sent: Thursday, January 26, 2012 12:20 AM To: K&R Yoksh Cc: app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] GPIO fan control 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 events=events [events] 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 -- Tim :wq 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
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
fan wear out by cycling on each PTT. I tried using the 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 WA5JXY
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