Raspberry Pi variable speed cooling fan controller

Docker container that keeps the CPU temperature at desired level with PWM enabled fan based on http://www.sensorsiot.org/variable-speed-cooling-fan-for-raspberry-pi-using-pwm-video138/

Docker-compose

version: "3.7"
services:
  fan:
    container_name: fan
    restart: always
    image: pilotak/rpi-fan
    environment:
      - DESIRED_TEMP=45
      - FAN_PIN=12
      - FAN_PWM_MIN=25
      - FAN_PWM_MAX=100
      - FAN_PWM_FREQ=25
      - P_TEMP=15
      - I_TEMP=0.4
    devices:
      - /dev/gpiomem

Environmental variables

Bellow are all available variables

Variable	Description	Default value	Units
DESIRED_TEMP	Temperature it tries to keep it at	40	°C
FAN_PIN	PWM pin where is mosfet driver or load-switch connected to	13
FAN_PWM_MIN	Minimal duty cycle to turn the fan on	20	%
FAN_PWM_MAX	Maximal duty cycle of fan	100	%
FAN_PWM_FREQ	Broker address	17	Hz
P_TEMP	Proportional constant	18.0
I_TEMP	Integral constant	0.3
READ_INTERVAL	How often read the temperature	2	seconds