The main idea
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ESP32 device with touch screen, supported by MicroPythonOS
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Two SHTC3 Temperature and Humidity Sensor: One indoor, one outdoor
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A special MicroPythonOS app to display information about indoor and outdoor conditions and provides advice on ventilation.
Hardware from soldered.com:
I collect all information here: jedie/DIY-MUC-Projects: Some maker projects around MUC, ESP32, microPython hardware projects - Codeberg.org