Arduino fan controller

Features

Control fan speeds by using the following modes:
- Auto: Use temperature->speed curves for each fan
- Low: All fans sets to their lowest value on the curve (that is not 0)
- High: All fans to their highest value on the curve (that is not 100)
- Full: All fans to 100%
SSD1306 Display:
- Fan speed control mode
- Sensor temperature
- Fan speeds percent (with RPM if tachometer is available)
Buzzer:
- When there is no display: beep to transmit control mode and temperature
- Beep when temperature is critical
Warning led: Blink when in low speed mode (as temperature may rise)
Button:
- Short button press
  - Send control mode, temperatures and fan speeds to serial output
  - Beep first temperature (mix of morse and roman numbers)
    - .: 1, ..: 2, ...: 3, .-: 4, -: 5, -.: 6, -..: 7, -...: 8, .--: 9, --: 0
- Long button press: Switch fan control modes
  - Auto (beep .-, morse code for A)
  - Low (beep .-.., morse code for L)
  - High (beep ...., morse code for H)
  - Full (beep ..-., morse code for F)

Install dependencies
- On GNU/Linux platforms, execute ./arduino-install-libs.sh
- On Windows platform, using the Arduino Library manager, install the following libraries:
  - ssd1306 by Alexey Dynda
Edit config.cpp to configure the different settings:
- Pinout
- Sensor list: pin
- Fan list: pin, speed curve, associated sensor
- SSD1306 display connection
- ...

Perfboard design & photos in board/