Raspberry pi 4 GPIO controlled cooling fan – python script

Published: 03 August 2020
on channel: talofer99

8,816

While working on the raspberry live video with tkinter I printed a case for the camera
• Raspberry pi Video stream image manipulati...
The case files can be found here
https://www.thingiverse.com/thing:274...
Full details
• Raspberry pi config built in GPIO controll...

I had to adjust it a bit, but it turned out great.
Now the more important thing I wanted to do was to add a fan to the rpi 4 that tend to run hot.
but I did not want it to run all the time, so I did 2 things.
I create a PCB that move the control of the fan to a GPIO using a NPN transistor as a switch.
And I wrote a little python script that takes the core temperature using this command : vcgencmd measure_temp. Once I get the temperature, I check if it’s over the threshold, if so I turn on the fan. If not turn it off. Pretty simple.
I added the script to the rc.local file and it works on boot now.

I had a great time also creating the box and mount using fusion360.

Hope you will find it useful.

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