Temperature driven PWM fan controller for raspberry pi over GPIO, designed with retropie in mind
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FanGPIO.c
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README.md

FanGPIO

A small script to turn your fan on and off via GPIO and PWM

How does it work?

FanGPIO starts when your pi boots up and runs in the background to adjust the pi's fan speed to your needs

  • At 40°C the Fan turns on spinning at 25%RPM
  • At 50°C the Fan goes up to 50%RPM
  • At 60°C the Fan goes up to 75%RPM
  • At 70°C the Fan fan is set to full 100%RPM
  • The Fan wont turn back off until it cools down to 38°C (this keeps it from turning on and off if your at that 40°C threshold)

Will this hurt my RetroPie performance?

FanGPIO is a super small script written in C to avoid any additional stress on your pi. I have not completed thorough tests yet however so far the max CPU usage I have noticed is 0.9% across one of the 4 CPU threads.

Instructions:

Do not use this directly connected to a fan, you will likely blow your gpio pin! (read below)

How to install the script:

To install this simple script on your raspberry pi copy and paste the following

git clone https://github.com/soulgriever/FanGPIO
cd FanGPIO
sudo sh install.sh

Reboot your pi and the script is installed, yup its that simple!

How to wire up the Pi:

I recommend using either a Logic Level Power Mosfet such as the one Here, or using a transistor such as a TIP31C.

  • Identify the base, collector, and emitter pins of your transistor/power mosfet.
  • Attach the Base Pin on the transistor to Pin 12 or GPIO18.
  • Attach the Collector to your common ground (Any ground pin on your GPIO or an external power supply).
  • Attach the Emitter to the negative terminal on your fan.
  • Finally attach the positive terminal of your fan to the 5v pin of your pi or external power supply