This document describes a student project to create an automatic room light controller with a bi-directional visitor counter. The project uses sensors to detect when people enter or exit a room and a microcontroller to count visitors and control the room lights accordingly. When the first person enters, the light turns on and the counter increments by one. When the last person exits, the light turns off and the counter resets to zero. The project aims to automatically control room lighting and count visitors to prevent wasted electricity in places like schools, offices, and homes. It discusses the components used, the circuit diagram, working principle, advantages like low cost and automatic operation, and potential applications.

1. A Project
on
Automatic Room Light
Controller With Bi-directional
Visitor Counter
By
Kushal Sarkar, Roll No. : 47
Lotish Gupta, Roll No. : 48
Niladri Dutta, Roll No.: 57
2nd year, B.Tech
Of
Department of Electronics and Communication Engineering
SIR J.C. BOSE SCHOOL OF ENGINEERING
Supreme Knowledge Foundation Group of Institutions

2. Contents

3. Introduction
Automatic Room Light Controller With
Bi-directional Visitor Counter
In today’s world, there is a continuous need for
automatic appliances. The objective of this project is
to make a controller based model to count number of
persons visiting particular room and accordingly light
up the room automatically. Here we can use sensor
and can know present number of persons.

4. Aim of our Project
The aim of our project is to make a controller
which can sense if any person enters the room
and it lights up the room automatically and
also counts how many person are entering the
room or going out of it. It is made to unwanted
prevent electric power waste in schools,
colleges, offices and houses. This whole
process is operated totally automatically by its
sensors.

5. Components Required

6. Circuit Diagram

7. Circuit Diagram

8. Working Principle

9. Working Principal

10. Working Principal
• If the sensor 1 is interrupted first then the microcontroller
will look for the sensor 2, and if it is interrupted then the
microcontroller will increment the count and switch on
the relay, if it is first time interrupted.
• If the sensor 2 is interrupted first then the microcontroller
will look for the sensor 1, and if it is interrupted then the
microcontroller will decrement the count.
• When the last person leaves the room then counter goes
to 0 and that time the relay will turn off, and light will be
turned off.

11. Advantages of Automatic Room
light controller
– Low cost
– Easy to use
– Can be implemented in single door
– Can be used for counting purposes
– Can be used for automatic room light control

12. Disadvantages
• It is used only when one person cuts the rays of
the sensor hence cannot be used when two or more
persons cross the door simultaneously.
• When anybody is inside the room and we need to switch
off the power then we’ve to do it manually. So, in this
case we fail to automatically control the light.
• In seven segment display board we can count up to a
certain no of people entering into the room. If the no of
body entering the room is greater than the maximum
limit of the display board then we fail to count it.

13. Other Applications
• For counting purposes
• For automatic room light control

14. Conclusion
The theme of this project when merged with certain
established technologies can be quite effective in
number of countries like Germany, France & Japan
etc. which control the train. This Project is useful in
developing countries and this project has a bright
future. This project helps us to control the light of a
room automatically and counts the number of
persons/visitors entering and leaving the room. By
using this circuit and proper power supply we can
implement various applications such as fans, tube
lights etc.

15. Bibliography
•
Reference Books:
•
E BALAGURUSAMY, “Programming in ANSI C”, Tata McGraw Hill, May 2010.
•
MUHAMMAD ALI, MAZID JANICE, GILLISPIE MAZIDI, “The
8051microcontroller and embedded systems”, Pearson Education, April 2009.
•
Websites:
•
www.datasheets4u.com
•
www.datasheetcatalog.com
•
www.8051.com

16. Acknowledgement
• We deem it a pleasure to acknowledge our deep sense of gratitude to
our Language Laboratory teacher, Mrs. Srima Nandi, Assistant
Professor, Dept. of Humanities & Social Sciences, Sir J. C. Bose
School of Engineering, Supreme Knowledge foundation Group of
Institutions (SKFGI), West Bengal, who directed and guided us with
her timely advice which eased the task of completing this Project.
• We wish to reciprocate in full measures the kindness shown by Mr.
Aritra Acharyya, Assistant Professor, Dept. of Electronics &
Communication Engineering, Sir J. C. Bose School of Engineering,
Supreme Knowledge foundation Group of Institutions (SKFGI),
West Bengal, who encouraged and inspired us in successfully
completing Project.

18. Any queries…. ????