rust-raspi-simple-fan

This is a simple application for your raspberry-pi.

I made it because I didn't have a PWM fan and it was a nice little project to:

• learn how to use a transistor as a switch
• fiddle around with the Pi's GPIO pins
• go a little deeper in rust programming

Three cli arguments are supported right now:

• -t u8 for target temperature in °C, default: 55, eg. -t 50 sets the target CPU temperature to 50°C
• -p u8 for pin as their BCM number, default: 14, eg. -p 15 sets the used GPIO pin to BCM number 15
• -i u64 for interval in milliseconds, default: 3000, eg. -i 1000 sets the check interval to 1000 milliseconds or 1 second

Further information

• at the target cpu temperature the configured GPIO pin gets set to high
• there is a hysteresis temperature of 5°C. At target temperature minus hysteresis temperature the configured GPIO pin gets set to low
• Example: configured temperature is 55°C. The fan will start when CPU reaches 55°C and try to cool it to 55-5 = 50°C until it stops. This should help with the fan stoppen and starting right up again.

Build target

The .cargo/config file includes settings to set the build target to armv7-unknown-linux-musleabihf. In order to compile you need to install the needed tools.