This document summarizes a student project to create an automatic room light controller that counts the number of people entering and leaving a room. The system uses sensors to detect movement and a microcontroller to increment or decrement the visitor count, displayed on a seven-segment display. It then turns the room lights on or off automatically based on whether the room is occupied. The aim is to prevent wasted electricity by automating room lighting. It lists the required components, describes the working principle and circuit diagram, and discusses applications and conclusions from the project.

1. “USER DEFINED PROJECT”
A Project
on
“Automatic Room Light Controller With Bi-directional Visitor
Counter”
SUBMITTED BY,
I.Makwana Krunal Mahendrabhai 116050311031
II.Bodiwala Vatsal Nileshbhai 116050311034
PROJECT HEAD:–
Mr. Jigar. M. Patel
Mr. Muktesh.P. Shah
B&B INSTITUTE OF TECHNOLOGY
V.V.NAGAR – 388120
AFFILATED TO:-
GUJARAT TECHNOLOGICAL UNIVERSITY
AHEMEDABAD.

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. Working Principle

7. Working Principal

8. 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.

9. Circuit Diagram

10. Circuit Diagram

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

17. Any queries…. ????