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TinyPICO
I'm trying to power a LoRa ESP32 board (SX1276) for a letterbox sensor. The board is in deep sleep until triggered by a pin change (door sensor), sends LoRa message, then returns
ESP32 Deep Sleep Tutorial - Hackster.io
ESP32 DevKit V1 +Battery Case by bkgoodman | Download free STL model | Printables.com