30-07-2015, 10:47 AM
APPLICATIONS OF DIGITAL OBJECT COUNTER USING LDR & IC 555 MONOSTABLE MULTIVIBRATOR
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digital object counter using ldr digital ic 555
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APPLICATIONS OF DIGITAL OBJECT COUNTER USING LDR & IC 555 MONOSTABLE MULTIVIBRATOR
30-03-2017, 12:32 PM
The entire circuit of the electronic meter is divided into three main sections: - input, display and conductor or section of the decoder. The input circuit consists of LDR which follows by the construction of the circuit of the negative square wave generator around the timer IC (NE555). A light bulb is used here as a light source focused on LDR. The property of LDR is that whenever light focused on the LDR base is obstructed, it gives the trigger and square wave is generated and given as input signal to the counter circuit. So the objects to be counted are arranged in a row to move one by one between the light source and the LDR.
![[Image: circuit-diagram-of-ldr-operator.jpg]](https://electronicsproject.org/wp-content/uploads/2012/12/circuit-diagram-of-ldr-operator.jpg)
IC2 shows any number between 0-9 according to the input square wave given to the pin 14. After each negative pulse, a transport pulse is produced by the decoder IC and given to another (ie from IC2 to IC3, IC3 to IC4, IC4 to IC5). IC5 and IC6 is a 7 segment BCD lock decoder controller. The reset switch SW1 is used to reset the electronics counter to 0000 states.
![[Image: circuit-diagram-of-electronics-counter-d...ounter.jpg]](https://electronicsproject.org/wp-content/uploads/2012/12/circuit-diagram-of-electronics-counter-decade-counter.jpg)
LIST OF PARTS:-
Resistors (all ¼ watts, ± 5% carbon)
R1 = 1 KΩ
R2 = 100 KΩ
R 3 = R 3 =
VR1 = 100 KΩ preselection
Condensers
C1 = 4.7 μF
C2 = 1000 μF / 10 V
C3, C4 = 0.1 μF
Semiconductors
IC1 = NE555 (timer IC)
IC2 - IC5 = 7490 (decade and binary counter)
IC6 - IC9 = 7447 (7 segment BCD decoder)
IC10 = μA 7805 (voltage regulator)
D1 - D4 = Display FND 507
Diverse
Mic1 = Microphone
B1 = Bulb
LDR
IC2 shows any number between 0-9 according to the input square wave given to the pin 14. After each negative pulse, a transport pulse is produced by the decoder IC and given to another (ie from IC2 to IC3, IC3 to IC4, IC4 to IC5). IC5 and IC6 is a 7 segment BCD lock decoder controller. The reset switch SW1 is used to reset the electronics counter to 0000 states.
LIST OF PARTS:-
Resistors (all ¼ watts, ± 5% carbon)
R1 = 1 KΩ
R2 = 100 KΩ
R 3 = R 3 =
VR1 = 100 KΩ preselection
Condensers
C1 = 4.7 μF
C2 = 1000 μF / 10 V
C3, C4 = 0.1 μF
Semiconductors
IC1 = NE555 (timer IC)
IC2 - IC5 = 7490 (decade and binary counter)
IC6 - IC9 = 7447 (7 segment BCD decoder)
IC10 = μA 7805 (voltage regulator)
D1 - D4 = Display FND 507
Diverse
Mic1 = Microphone
B1 = Bulb
LDR
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