I recently bought a cheap clock + thermometer from a store. It looks quite nice, but only works ~12h on 3xAA battery and the thermometer is wildly innacurate. Good excuse to replace the internals with something made myself!
Hardware:
- Rasberry Pico W
- DS3231 RTC (clock)
- AM2320 Temperature & Humidity sensor
- CN3065 BNC + Li-on 18650 battery
- Shell + LED matrix from "Blokker Stella" clock
Software:
- Microptyon
- NTP for time