Bi-directional Visitor Counter

Many times we need to monitor the person/people visiting some place like Shopping mall / temple. To provide solution for this we are going to implement a project called “bidirectional Visitor Counter”. This project has a “Visitor counter”. Main concept behind this project is to measure and display the number of persons entering in any room like seminar hall, conference room. This project can be used to count and display the number of visitors entering inside any conference room or seminar hall. This works in a two way. That means counter will be incremented if person enters the room and will be decremented if a person leaves the room.
When the number of person is equal to zero then the lights or fan inside the room are turned off using a relay. The counter used is bidirectional, this means that count will increase when person enters inside room and count will decrease when any person leaves the room.
So whenever count is greater than or equal to 1 then the relay is turned on and respectively the light / fan are turned on. This project is useful because many times we come outside the room and forgot to turn off the fan, thus we waste the electricity and power wastage.