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Arduino Door Open Alarm with Keypad – Security System! 🚪🔥 #Arduino
Simple but effective Arduino door security system! 🚪 - Magnetic reed switch on door (opens when door opens) - Active buzzer screams loudly if triggered - 4x4 or 3x4 keypad to enter password and disarm alarm - External battery pack for power Perfect beginner project for home security, room alarm, or learning keypads + interrupts. Wrong code ...
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