[arm-allstar] Repeater fan control...

[Hostgate]

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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