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Raspberry Pi variable speed cooling fan controller

Docker Build Docker Pulls Docker Size

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