Temperature Sensing

This project started as a small side task to build a temperature sensor to monitor a freezer at a food pantry. It is still focused on that, but has become a critical part of my own self-learning journey. Here is a sample of one of the sensors, showing the boot up POST screen:

In summary, the temperature sensors are based on:

• a compact and simple 3D printed box (case and lid), with STL files provided

• a Raspberry Pico W to do all the computing

• a small TFT screen for local readout

• common DS18x20 temperature sensors

• an array of screws and components, with a full parts listed provided

• custom-built MicroPython with temperature sensor code frozen in place, with complete firmware provided

• full documentation, including a separate assembly instruction manual provided

• polished provisioning step leveraging the Pico’s Wi-Fi access point

• flexible code that utilizes abstract screen, config, and controller base classes

• fully tested source code, targeting 100% coverage

• leverages GitHub to store the data, build the dashboard, run checks, and alert for out of range temperatures or unresponsive units

Contents:

• Building Your Own
  • Required Tools
  • Parts List
  • First Steps
  • Wiring Details
  • Flashing the Pico
  • Installing the Factory Reset Switch
  • Temperature Sensor(s)
  • Installing the Pico
  • Installing the Sensor Breakout Board
  • Final Wiring
  • Manually Copying Firmware Files
  • Provisioning the Runtime Configuration
  • RGB Check
  • Final Steps
  • Normal Operation
  • Screen Details
  • FAQ
• Pinout Diagram
  • Pico
  • TFT Display
  • Temperature Sensor Breakout Board
• Developer Topics
  • Adding a New Sensor
  • Forking the Project
  • Building the Custom Firmware
  • Code Documentation