Fan doesn't stop at all!

[rossirm]

Hi, there, I have bad luck with my FanShim cause it doesn't stop though the off-threshold and keeps spinning all the time. Have you any ideas how I can solve this issue?
Note: I am new to programming in Python!

[Gadgetoid]

Might be worth disabling the service and seeing if you can control the fan directly with Python:

sudo systemctl stop pimoroni-fanshim.service

Then run Python:

sudo python

And type:

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO.output(18, 0) # Should turn fan off
GPIO.output(18, 1) # Should turn fan on

Alternatively you can save the latter into a test.py, comment out the "on" portion and run it.

[rossirm]

There is no effect of this solution but can I ask you where do you know the pin number of the fan which is pin 12 (BCM18)? Can you give me some link, if you have seen it somewhere, please!?

[Gadgetoid]

You can find pin assignments documented on my website here - https://pinout.xyz/pinout/fan_shim

This not working suggests you might have an intermittent/poor connection between your Fan SHIM and Pi. It might be worth double-checking it's mounted securely since the friction-fit header isn't perfect.

The best way to try this is by running something like:

import signal
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO.output(18, 0)
signal.pause()

And then adjusting the Fan SHIM gently until the GPIO connection is made and the fan stops.

• Also note that if you run the code in my above resposne verbatim it will very quickly turn the fan off/on and you will see no effect.

[rossirm]

Thank you so much!
My problem is solved after I attached on top of GPIO a T-Cobbler Breakout Kit for Raspberry Pi and realized that the real problem in my case comes from lack of good contact between Fanshim and RPi 4.
It works properly now! :)