[arm-allstar] Repeater fan control...

[Robert Conklin]

Suggest looking up "W1209 Thermostat control", or just "W1209" on eBay. I
have been using the W1209's with fantastic success for years on many mobile
radio applications for node/repeater/link radio use. They're very
inexpensive, easy to use and have tons of bundled case options. Try also
searching eBay for "W1209 with case". I typically pay less that $4 apiece
with a case. If you need one, I suggest buying two or three, because they
are so cheap and because DOA's, though rare, do happen.

--
Robert Conklin
*N4WGY <http://qrz.com/db/N4WGY>*


On Tue, Feb 26, 2019 at 7:51 PM "Hostgate via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Methinks it’d be simpler to use a mechanical thermostat to control the
> fan. Simple = better
>
> > On Feb 26, 2019, at 11:26 AM, Doug Crompton via ARM-allstar <
> arm-allstar at hamvoip.org> wrote:
> >
> > Vendel,
> >
> >   I leave all my fans run 24/7 but there are many ways to do it.  The
> > problem comes in if you just want it to run when PTT is asserted or for
> > some time after that.  A simple emperature switch is probably the easiest
> > way. Here is a controller -
> >
> >
> https://www.amazon.com/Generic-Temperature-Control-Thermostat-Thermometer/dp/B00Q6WQJ2O
> >
> > To have control using the Pi you could use a GPIO bit on the USB FOB.
> This
> > would turn on the fan during PTT and off with no PTT. If you needed a
> > longer delay after PTT then you could time it in a script but then how do
> > you know you are really controlling the temperature accurately. There are
> > lots of examples out there but I really don't think this is the best way
> to
> > do it.
> >
> > The reason the standalone temperature sensor would be better is that it
> > would maintain a specific temperature that you set based on where the
> > sensor is placed. Thus if the ambient changed it would still work well.
> If
> > you control from the Pi based on PTT even with some delay at PTT drop it
> > does not take into account the ambient temperature. If you added an input
> > for the actual temperature you mine as well buy one of these cheap
> > controllers! This is also complete independent of the Pi so it would work
> > with anything that needed to be maintained at a certain temperature.
> >
> >
> > *73 Doug*
> >
> > *WA3DSP*
> >
> > *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
> >
> > On Tue, Feb 26, 2019 at 2:11 PM "Vendel via ARM-allstar" <
> > arm-allstar at hamvoip.org> wrote:
> >
> >> I’m sure this has been covered before so please don’t rip my head off.
> 😉
> >> What is the best way to turn my repeater cooling fan (small 12 volt
> fan) on
> >> and off using my Pi node/ controller. Thanks, Vendel/ K2DSI.
> >>
> >> Sent from Mail for Windows 10
> >>
> >>
> >>
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