Design and Construction of a Digital Bidirectional Visitor Counter (DBVC)

This study presents the Design and Construction of a Digital Bidirectional Visitor Counter (DBVC). The DBVC is a reliable circuit that takes over the task of counting number of persons/visitors in the room very accurately. Depends on the number of visitors, when the number of visitors reach the maximum required, the number will show on display board to indicate that the Hall is full. When somebody enters the Hall then the counter is incremented by one (+1) and when any one leaves the room then the counter is decremented by one (-1). The total number of persons inside the Hall is also displayed on the (P10 Display board). The microcontroller is used for detecting an entry or exit action and computing the figures (addition and subtraction) to acquire accurate results. It receives the signals from the sensors, and this signal is operated under the control of embedded programming code which is stored in ROM of the microcontroller. The microcontroller continuously monitors the Ultrasonic Receivers. When any object pass through the Ultrasonic Receiver’s then the Ultrasonic Rays falling on the receivers are obstructed. The obstruction occurs under two circumstances, either you obstruct sensor 1 (i.e. outside the building) before sensor 2 (i.e. which is inside the building) this shows that you are entering the building or you do it the other way round, which is obstructing sensor 2 before sensor 1 to indicates an exit movement. This obstruction is sensed by the Microcontroller, computed and displayed by a P10 Displayed board.