Door Sensor With Counter

This circuit consists of ldr which senses the light fron led fixed at the opposite side of the door.The seven segment display displays the no of interuptions in the led to ldr path. EQUIPMENTS REQUIRED 1. IC LM324N (1 pc)2. IC 7404 (1 pc)3. 10 Kohm potentiometer (1 pc)4. IC CD4026/33 (2 pc)5. 7...
By: DChaurangi

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