I’ll inspect the schematic, connectivity, and component values, then create a detailed project walkthrough covering power, sensing, ESP32 behavior, indicators, programming, and expected operating sequence.

I reviewed the current schematic and confirmed the detailed explanation is already documented in WiFi Door and Window Sensor — Project Explanation.

In short: a single AA battery passes through PMOS reverse-polarity protection and a TPS613221A boost converter to produce 3.3 V. The ESP32-C3 monitors a magnet-operated reed switch, wakes when the door/window changes state, reports the event over WiFi or BLE, briefly uses the RGB LED for status, then returns to deep sleep. The project file includes the complete power path, GPIO mapping, reed-filter circuit, programming process, PCB implementation, firmware sequence, trade-offs, and current design risks.