DS18B20 Controlled Freezer Project

This project transforms a standard freezer into a digitally temperature-controlled unit using a DS18B20 temperature sensor. It allows the user to switch between "Refrigerator" and "Freezer" modes using a physical switch. The current mode and temperature are displayed on an I2C LCD. This system is developed using MicroPython on a Raspberry Pi Pico. By controlling the temperature through a relay, which turns the freezer on and off, this project can also revive freezers or refrigerators with malfunctioning thermostats.

Hardware Requirements

• Raspberry Pi Pico
• DS18B20 Temperature Sensor
• LCD Display
• I2C Interface
• Relay Module
• Physical Switch, Wires, Power Supply, ...

Setup and Installation

1. Hardware Assembly:

   • Connect the DS18B20 temperature sensor, I2C LCD, relay, and switch to the Raspberry Pi Pico according to the provided schematics. If you choose different GPIO-Pins, adjust the code respectively. Default GPIO-Usage:
   • Ensure the built-in thermostat of the freezer is set to its highest setting.

2. Software Setup:

   • Flash your Raspberry Pi Pico with the latest version of MicroPython.
   • Clone this repository to your local machine.
   • Transfer the main script and the other .py files to your Raspberry Pi Pico.

3. Configuration:

   • Adjust the temperature thresholds in the script as per your requirements for both 'Refrigerator' and 'Freezer' modes.
   • Change the displayed names of the modes depending on your preferred language (Kuehlschrank == Refrigerator; Gefrierschrank = Freezer)