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The final part: battery backup, OTA updates, watchdog, health monitoring, and full Home Assistant / MQTT integration – turning your weekend project into a 24/7 reliable security system.
Upgrade from Part 1: automatic porch light when dark + motion, real doorbell when door opens, and photos saved to microSD when WiFi drops.
A clean, single-board ESP32-CAM motion-triggered camera that instantly sends a photo to your Telegram when someone is at the door. No extra Arduino, no Gmail, no outdated hacks.
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