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Gerbers, BOM, and Schematics for Open UpCell [1S]
Pointless Button Hardware Version 2
ESP32 WROVER development board with environmental sensors, tiny OLED display, 18650 battery and SD card slot
ESP32 WROVER board with 18650 battery and environmental sensors
(鉄): A E-ink Display that displays custom information, driven by a Raspberry Pi and powered by two 18650 rechargable batteries.