DavideM84 / Raspberry-PwmFanControl

Phyton script that monitors the temperature and adjusts the speed of the cooling fan

Raspberry - PwmFanControl

Phyton script that monitors the temperature and adjusts the speed of the cooling fan.
For Raspberry and 5V FAN.

Davide Mencarelli - [e-mail]
First release: 18/01/2021

Notes

Script for Raspberry Pi
Required modules: RPi, gpiozero (pip install gpiozero)
The phyton file is fan_by_pwm.py
Script for Phyton 3.7+
Configuration file: fancontrol.cfg
Optional: copy fancontrol.sh in /etc/init.d/ for starting at boot

Configuration

LOG_LEVEL

Logging messages which are less severe than level will be ignored (/fancontrol.log)
CRITICAL      50
ERROR         40
WARNING    30
INFO            20
DEBUG         10

PWM_FREQ

GPIO PWM Frequency

GPIO_PIN

The GPIO PIN connect to the base of the transistor

INTERVAL

Each x seconds check the CPU Temperature

ON_THRESOLD

Above this temperature the FAN start.
When it drops below this value it switches off.

Temps and Speed

This two array indicate temperature interval and fan speed to set.

Example:
Temps: [ 45, 55, 9999 ]
Speeds: [ 50, 75, 100 ]

ON_THRESOLD < T < 45 => SPEED 50%
45 < T < 55                      => SPEED 75%
55 < T < 9999                  => SPEED 100%

Eletronic

+5V to the FAN
GPIO_PIN to the base of 2N222 transistor
GND to the collector of 2N222 transistor
Emitter of 2N222 transistor to GND of the FAN