193 Comparison of 10 ESP32 Battery powered Boards without display (incl. deep-sleep) - YouTube
uPesy ESP32 Wroom Low Power DevKit Board
ESP32 Deep Sleep Tutorial - Hackster.io
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