ESP32 NodeMCU WROOM-32 Dev Board 30-Pin WiFi Bluetooth Dual Core Arduino ESPHome

ESP32 NodeMCU (30-Pin) I²C Device ----------------------------------- 3V3 ───────────► VCC GND ───────────► GND GPIO21 ───────────► SDA GPIO22 ───────────► SCL Notes: • ESP32 uses 3.3 V logic • Always share GND between modules.

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