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person counter
To make an object counter we can use a simple dark detector circuit and a normal calculator.
This is very attention-grabbing idea of using calculator for counter. Using calculator is cheaper and less complicated then the circuit of counter. The components used in this circuit are easily available and can be assembled even by beginners.
First press 1
Then Press +
Then keep on pressing =
parts
VR1 = 10 KΩ
T1 = BC548
D1 =1N4001
LDR
Calculator
relay = 9V
LED
220 ohm