Automatic Doorbell System With Object Detection

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This is one of the very interesting and much useful circuits in our real life named "Automatic Doorbell Ringing System". If we install this automatic doorbell using object detection circuit, the circuit will automatically sense the presence of the person and it rings the doorbell.

This circuit operates using a pair of ultrasonic transmitter and receiver modules which are used to detect the person and then if the person is detected, the door bell is automatically turned ON when the person is in-front of the door.

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