Raspberry PI 4 with Waveshare PWM controlled Fan HAT

Game-Force · January 20, 2021 at 8:28 PM

I have been using LibreElec on my Raspberry PI for quite some time watching Netflix etc.

I live in a very hot area and used FANs running from the GPIO. I bought new fans about every 2 to 3 months and came across the Waveshare PWM controlled Fan HAT which switches off from time to time, saving the fan.

My problem is this. I can get it to work on all other OSs except LibreElec.

The coding on their website does not work either.

Can you help me please?

Thank you

Fan HAT - Waveshare Wiki

Skripo · February 21, 2021 at 6:21 PM

Did they not give you a script to install?

Game-Force · February 23, 2021 at 2:20 PM

The script is only for Raspberry OS. This I only discovered afterwards

Zohan · January 4, 2022 at 5:27 AM

Hi guys

I'm in the same boat running Armor lite heatsink w pwm fan! I stumbled on info about overlays, there is 1 called gpio-fan. This is the info from the read me file

Name: gpio-fan

Info: Configure a GPIO pin to control a cooling fan.

Load: dtoverlay=gpio-fan,<param>=<val>

Params: gpiopin GPIO used to control the fan (default 12)

temp Temperature at which the fan switches on, in millicelcius (default 55000)

so i put

Code

dtoverlay=gpio-fan,<13>=<60000>

into config.txt (pwm wire plugged into gpio#13 and 60 for temp)

after booting i ran

Code

vcdbg log msg

in putty to find out if it loaded. unfortunately this is what it spit out

006716.968: brfs: File read: /mfs/sd/overlays/gpio-fan.dtbo

006743.302: dterror: can't find symbol '_hot'

006743.320: Failed to resolve overlay 'gpio-fan'

Am I supposed to alter the actual overlay file?

I'm sure I'm on the right track but have no idea what I'm doing! It looks like I'm on the right track but doing something wrong.

Any help would be greatly appreciated and hopefully this will be a simple solution for others!