[arm-allstar] Repeater fan control...

[Luc Drolet VE2LUQ]

Hello everyone,

I have several rasbperry Pi and I use the DOUG script and I made my adjustment to 45 C
and the fan run about 2 seconds to cool the CPU

a fan has a limited duration of about 30,000 hours, or I know it's a lot
but in this way it runs only 2 seconds over a period of about 3 minutes
I use the 5 Volts Rasbperry with a small relay that is activated by the pin
GPIO.23 Pi Physical pin 33

and I am very often on the supermon web page and the CPU temperature is still constant at 45 C

see attached file for electrical diagrams

73's
Luc
VE2LUQ

> Le 28 févr. 2019 à 10:12, Ron Gilson via ARM-allstar <arm-allstar at hamvoip.org> a écrit :
> 
> Thanks for the link.  While my AllStar fans run 24/7/365, I recently bought
> a freezer.  To my surprise there was no alarm if the unit failed.  Cheap
> and easy way to solve this problem.
> WA2WWK  Ron
> 
> On Tue, Feb 26, 2019 at 8:51 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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