D IGITAL O BJECT C OUNTER Prepared & presented By Jyoti Bhaskar VII sem. EEE,VIET.

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Presentation transcript:

D IGITAL O BJECT C OUNTER Prepared & presented By Jyoti Bhaskar VII sem. EEE,VIET

A GENDA Introduction Circuit Diagram Circuit Working Components

INTRODUCTION  The statisticians use special formulae to calculate the approximate number of people coming to and going out of a place in a given time. But none of these formulae can give 100% accurate and precise results. It is impossible to manually count the same. But now using modern object counter circuit, it is possible to count the same with 100% accuracy.

ABOUT CIRCUIT  The circuit has one sensor fitted (at the waist-level) on the entry door. It consists of a light beam propagated on the LDR circuit. So long as the LDR is lighted, its resistance is LOW and the circuit remains silent.  But when the light beam is cut by an entering person, the resistance of the LDR increases and a single clock pulse is fed to the input of the circuit to advance the count by 1–digit

CIRCUIT DIAGRAM

COMPONENTS USED IN DC  555 configured in monostable mode (automatic dark sensor using 555)  555 configured in astable mode.  decade counter  BCD to seven segment display  Seven segment display- Common anode.  Resistors  Capacitors  Light Dependent Resistor (LDR)  Light Emitting Diode (LED)

555 TIMER IC

 The 555 has three operating modes 1.) MONOSTABLE MODE 2.) ASTABLE MODE (Free running mode) 3.) BISTABLE MODE:

7490 IC

7447IC

LDR

SEVEN SEGMENT DISPLAY There are two types of LED 7-segment displays:- 1.) Common cathode(CC) 2.) Common anode(CA)

LIGHT-EMITTING DIODE (LED)

RESISTOR CAPACITOR PRINTED CIRCUIT BOARD

THANK YOU