temp_humidity_micropython_lvgl

Full Tutorial in this GITHUB REPO

Project Description

In this project, I'll explain how I built a temperature and humidity display using MicroPython and LVGL.

Building the Firmware:
I checked out lvgl-micropython from lvgl-micropython and built the binary file for the ESP32-S2 Mini with the ILI9341 display. I'm not sharing the exact make command because the code is still under development and there are ongoing changes.

Wiring the ESP32-S2 Mini to the ILI9341 and DHT11:
Proper connections were made between the ESP32-S2 Mini and the ILI9341 display, as well as the DHT11 sensor. You can refer to the main.py for the pin definitions.

Using Squareline Studio:
I downloaded Squareline Studio. Although it's not recommended by the lvgl_micropython developers due to compatibility issues with the generated code, I used it and customized the code to fit the lvgl_micropython bindings from kdschlosser.

Additional Features:

• German Time: The German_time class handles synchronization with an NTP server, including summer and winter time adjustments, though I'm not yet 100% satisfied with the solution.
• MQTT: The project includes MQTT functionality. If you use Home Assistant, you can send the temperature and humidity measurements via MQTT to your MySQL database.
• WiFi Connection: The code attempts to connect to your defined SSID and password. If unsuccessful, it opens an access point.
• Error Exceptions: I've implemented "try/except" blocks in several places to handle errors, timeouts, or OS errors, and log error messages in the MicroPython REPL.
• Automatic Y-Axis Range Adjustments: The Y-axis range in both diagrams adjusts automatically.
• Automatic X-Axis Range: The X-axis range in both diagrams updates automatically (one step per hour).

https://github.com/fabse-hack/temp_humidity_micropython_lvgl