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PyFoehn

Description

A 2-pin fan for a Raspberry Pi can be put on the ground and the 5V pin to let it run constantly.

The PyFoehn service allows to use PWM with a 2-pin fan instead of a 4-pin smart fan.

The service needs a small circut containing a resistor, transistor and a capacitator which fit on a 1x2cm breadboard.

I may upload the layout for the circuit when someone opens an respective issue, though...

...all in all this solution is outdated and I'd advise to just invest a few bucks more and buy a 4-pin fan and use smaRSt-fan / (github: link) without needing any extra breadboard or pcb circuit.

Installation

Copy the script folder to the Raspberry

In my case it was a retropie-system, so I copied the
foehn.py-file, the config-folder and the src-folder
via SFTP to the folder "/home/pi/RetroPie/retropiemenu/PyFoehn"

How to install the service

Adjust the file pyfoehn.service to your needs

  • "WorkingDirectory" needs to be the path to the where you copied the script and additional folders
  • Modify the "WantedBy" according to your needs
    e.g. if you only want to start the service in a graphical login use "graphical.target"
  • Otherwise have fun with the docs

Modify the config.json in the config-folder:

  • Set general->foreground to false
  • Set general->logconsole to false
  • Set general->logfile to false
    This will ensure that /tmp/PyFoehn.log won't grow indefinitely, because it is only meant for debugging the service

Install the service-file:

  • Copy pyfoehn.service to /etc/systemd/system
  • cd /etc/systemd/system
  • sudo systemctl enable pyfoehn.service
  • If the service won't start consult the file /var/log/daemon.log

The service will be started on every boot.

If you want to stop it execute "sudo systemctl stop pyfoehn.service"