Kegerator

Replacement Control Board for the Keg Master Series 3 (Model: BC168)

I acquired a Keg Master Series 3 kegerator a while ago. While it's a nice fridge, it was not without it's issues.

1. If power was cut, it would revert back to a default temperature (0.4°C degrees if I remember correctly), and displaying fahrenheit (why!). Beyond the obvious issue of it forgetting the set temperature, this was more an issue because:
2. It was running cold. Any lower than 0.4°C and the kegerator is dangerously close to below freezing. I've managed to freeze a keg and numerous bottles.

So, the obvious thing to do was to make a new controller!

This controller has a ESP32, as well as a 128x32 i²c LCD.

I've replaced the thermistor with a Dallas ds18b20 temperature sensor (in parasitic mode so I can reuse the two-wires), and added a line for a heater relay so the board can be reused for a fermenter.

The front buttons are wired up as well. The esphome firmware I use switches out the "unit" button with a on/off button.

Example esphome configuration

esphome:
  name: kegerator
  
esp32:
  board: esp32-s2-saola-1

i2c:
  sda: GPIO16
  scl: GPIO15

font:
  - file: "gfonts://Roboto"
    id: font_large
    size: 18
  - file: "gfonts://Roboto"
    id: font_small
    size: 8

display:
  - platform: ssd1306_i2c
    model: "SSD1306 128x32"
    lambda: |-
      float current_temperature = id(kegerator_pid).current_temperature;
      float target_temperature = id(kegerator_pid).target_temperature;