docker-rpi-fan

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Raspberry Pi variable speed cooling fan controller

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# Raspberry Pi variable speed cooling fan controller
![Docker Build](https://github.com/pilotak/docker-rpi-fan/workflows/docker%20build/badge.svg) ![Docker Pulls](https://img.shields.io/docker/pulls/pilotak/rpi-fan) ![Docker Size](https://img.shields.io/docker/image-size/pilotak/rpi-fan?color=orange)

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/](http://www.sensorsiot.org/variable-speed-cooling-fan-for-raspberry-pi-using-pwm-video138/)

## Docker-compose
```yaml
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 |

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