This document describes a bi-directional visitor counter circuit that uses infrared (IR) sensors to count the number of people entering and exiting a room. The circuit uses two sets of IR sensors with an IR LED and photo transistor at each end to detect movement. When a person passes through the sensor, it interrupts the IR light and the microcontroller detects the signal change and increases or decreases the count. The system displays the in and out counts on an LCD and can help monitor visitor numbers in places like auditoriums, halls, and museums without human intervention at a low cost.
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