2 DIGIT OBJECT COUNTER

Presented to:

Prof. Muhammad Rameez

Presented by:

“The FJ group”Wajeeha Ally(0090)Afira Rashid (0093)Rabia Nisar(0086)

Ayesha Zafar(0092)

2 Digit Object/Product counter

Object counters or product counters are important applications used in industries, shopping malls, etc. They count objects or products automatically and so reduce human efforts. In this tutorial we are going to design a simple object counter circuit without using any microcontroller.

Components1. LM358 IC - 12. 555 timer IC -13. Voltage Regulator 7805 -14. 150 Ohm - 25. CD4033 -26. 10K resistor -27. 100K resistor -18. 10K POT -19. 220uF capacitor -110. IR sensors-111. Bread board-112. 9 Volt Battery -113. Battery Connector-114. LED -2

CIRCUIT DIAGRAM

EXPLAINATION In this circuit we have used a comparator

(IC LM358) and IR transmitter and receiver pair for detecting an object.

And then we have used a 555 timer IC to generate a pulse for triggering the seven segment decoder (CD4033) and two common cathode seven segment display units are connected with 7 segment decoder IC.

EXPLAINATION 555 timer IC is configured in mono-

stable mode for generating pulse. A LM7805 Voltage regulator is used

for providing constant 5 volt power supply for the circuit.

And a 9 volt battery used for powering the whole circuit.

WORKING

In this circuit we detects object by using IR sensor and comparator and then we applied output of comparator to mono-stable multi-

vibrator. This mono-stable multi-vibrator generates a pulse of fix time period which can

be set by using given formula. T=1.1RC

WORKING

WORKING

In this circuit we have selected R1 is 10K and C1After getting a pulse from 555 timer we applied

this to clock pin of 7 segment decoder (U4) and then carry out signal (pin 5) to clock pin of

another 7segment decoder (U3). After getting pulse from 555 timer 7 segment counter changes

number value of segment display.

WORKING

when number counting reaches at 10 in U4 decoder then it sends carry out signal

or pulse to seconds 7segment decoder (U3) and then second display changes his number value. And this process repeats

again. This object counter circuit can count 00-99.

CIRCUIT