12-07-2012, 11:04 AM
Digital Object Counter
Digital Object Counter.ppt (Size: 3.96 MB / Downloads: 211)
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