Abstract: In today’s world, there is a continuous need for automated appliances. With the increase in the living standards, there is an immediate need for developing circuits that would change the complexity of life to simplicity. This Project title “Bidirectional Visitor Counter with Automatic Room Light Controller and Arduino as the master controller” is designed and presented in order to count the visitors of an auditorium, hall, offices, malls, sports venue, etc. The system counts both the entering and exiting visitor of the auditorium or hall or other place, where it is placed. Depending upon the sensors interruption, the system identifies the entry and exit of the visitor. On the successful implementation of the system, it displays the number of visitor present in the auditorium or hall. This is an economical cost reducing system when implemented in places where the visitors have to be counted and controlled. Counting the visitors can be time consuming so it helps to maximize the efficiency and effectiveness of employees, time saving and sales potential of an organization, etc.