ESP32 using Arduino IDE works pretty good already and is improving rapidly. The Arduino port does not have Bluetooth yet but the WiFi and all kinds of other stuff works like OLED, and BME280 that I used for this.

This is a little guy I am working on for my guitars to track and regulate the temperature and humidity plus send alarms if the values exceed a set range. I like the OLED and the BME280 has the extra pressure value for an approximate altitude.

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