Introduction

This project can be employed in a room to count the number of visitors entering into the room and also switch ON or OFF the lights automatically. When there is no any person in the room then the seven segment display will show zero count and the lights will be off in the room. If anyone enters the room, the display shows the count and also the circuit will switch ON the light.

Block Diagram

Circuit Description

LIGHT TRANSMITTER SECTION

LIGHT RECEIVER SECTION

LDR (Light Dependent Resistor) :

Resistance varies according to the light.

Circuit Diagram

Applications

The circuit is designed for offices.

The circuit can also be used in homes due to its low cost.

By increasing the number of the displays it can also be used in auditoriums and seminar halls.

It can also be used in the lecture rooms.

By a little modification it can also be used in parking systems