Automatic Room Lights Controller Using Arduino & PIR Sensor

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End-Semester Project Report
AUTOMATIC ROOM LIGHTS CONTROLLER USING
ARDUINO AND PIR SENSOR
By:
ANKIT KUMAR CHAUDHARY
(15/IEE/055)
Under The Guidance Of
Dr. M.A. ANSARI
Department of Electrical Engineering School of
Engineering
Gautam Buddha University Gautam Budh Nagar
UP,India

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ABSTRACT
In this project, we will see the Automatic Room Lights using Arduino and PIR
Sensor, where the lights in the room will automatically turn ON and OFF by
detecting the presence of a human.
Such Automatic Room Lights can be implemented in your garages, staircases,
bathrooms, etc. where we do not need continuous light but only when we are
present.
Also, with the help of an automatic room light control system, you need not worry
about electricity as the lights get automatically off when there is no person.
So, in this DIY project, we have implemented Automatic Room Lights using
Arduino and PIR Sensor.

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ACKNOWLEDGEMENT
I wish to express my profound gratitude and indebtedness to
Dr. M.A. ANSARI SIR, Department of Electrical
Engineering , Gautam Buddha University for introducing
the present Automatic Room Lights Controller Using
Arduino And PIR Sensor and for their inspiring guidance ,
constructive criticism and valuable suggestion throughout the
project work. Last but not least, my sincere thanks to all our
friends who have patiently extended all sorts of help for
accomplishing this undertaking.

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INDEX
Contents
1 INTRODUCTION
2 SYSTEM COMPONENTS DESCRIPTION
3 CIRCUIT DIAGRAM
4 CONNECTION DIAGRAM
5 PROGRAM CODE
6 WORKING OF THE SYSTEM
7 CONCLUSION
8 FUTURE WORK
9 REFERENCES

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INTRODUCTION
Intelligent Energy Saving System, the aim of the project is to save the energy. In this project we
are using various sensors, controlling and display.
However, in this project work the basic signal processing of various parameters which are
temperature, LDR, Smoke sensor. For measuring various parameters values, various sensors are
used and the output of these sensors are converted to control the parameters. The control circuit
is designed using micro-controller. The outputs of all the three parameters are fed to micro-
controller. The output of the micro-controller is used to drive the LCD display, so that the value
of each parameter can be displayed. In addition to the LCD display micro-controller outputs are
also used to driver a relay independently. This relay energizes and de- energizes automatically
according to the condition of the parameter.
LITRRATURE SURVEY
Literature survey is the study of already established systems and collection of information
which helps in doing new tasks. Vibhuti et al [1] proposed a system which operates with control
of relays and with the use of WAGO PLC (Programmable Logic Controller) and Arduino Uno.
Switching operation of devices such as tube light, fan, AC, etc. can be operated spontaneously
by using PIR sensor and on the basis of environmental conditions. In real-time implementation,
automatic control is done by sensor data and manual control is done by android application.
But, difficulty in this paper is the controlling and monitoring of devices done by WAGO PLC
and Arduino Uno both. These operations can be done by using only Arduino Uno. Maslekar et
al [2] proposed a smart lighting system in which Raspberry Pi has used. Raspberry Pi is
monitoring lights and fans simultaneously. In the absence of person room lights and fans will
automatically turns OFF. Energy is preserved by using this smart lighting system. The
experimental results of this system have shown that 50% energy is conserved. But the difficulty
is Raspberry Pi is more expensive than Arduino Uno. Automatic Lighting and Control System
for Classroom in which electrical light is controlled by Bluetooth, PIR sensor and relay. To
switch ON or OFF the light Bluetooth module is connected to Arduino Uno which sends voice
command from Arduino Uno by using the mobile android application. The experimental results
have shown the 50% energy is conserved. But this paper can be implemented by removing the
Bluetooth module as well [3]. In [4], the disquisitions speak about automatic room light system
by using visitor counters operation. Depending upon the human presence, the room lights ON
or OFF. There is no need of manual operation for switching. The PIR sensor is used to the
human presence which is at the entrance of room. As

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visitor counter is used, there is increment in the counter when person enters in the room and this
leads to turn ON the room light which is controlled by microcontroller program. If person exits
the room, the counter decremented and this leads to turn OFF the lights. When all persons
left the room then only lights in the room switched OFF. The difficulty in this system is that
the door of room should not allow more than one person at a time. Vahid et al [5] proposed a
system whose control is depend on Arduino microcontroller, network communications and
Modbus industrial protocol. Arduino Ethernet shield and a wireless router device is used to built
the network communication. The specific Android application is used to load the Modbus
program into mobile or Windows software named "mypro" and on Arduino board, Arduino
code loaded through USB (Universal Serial Bus) cable. There is interconnection between
Arduino Ethernet Shield and mobile through Ethernet cable and router. By connecting to router,
user can control and monitor the appliances easily. The Table 1 summarizes the available
methods in Literature survey.
SYSTEM COMPONENTS DESCRIPTION
The automatic room lights control system consists of different hardware components that can be
used for sensing, processing and controlling of appliances. These hardware components are
discussed below:
PIR Sensor as Sensing Unit
The sensing unit is used to get input parameters from surrounding which is required for
automation. For particular area of room, the following points must be kept in mind to perform
operation in good order.
Continuous changes in human motion Capability Sparing (Economical)
Here, the sensing unit used is PIR (Passive Infrared) sensor which is as shown in given
Figure 1.

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This PIR sensor is "Passive Infrared", which is also called as "Pyroelectric", or "IR
motion"sensors. The working of PIR sensor is to detect the motion of a person when person comes
in the sensing range of the sensor. The specialtyof this sensor is it is little, affordable, low power,
easy to use and do not exhaust. Hence, this sensor is used in many home automation appliances.
Arduino Uno As Processing Unit
Arduino Uno is a microcontroller in which ATmega328 microprocessor is used which is shown
in the Figure 2.

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It has 6 analog input pins and 14 digital input or output pins which can be used as PWM(Pulse
Width Modulation) outputs. It has its own programming language. The crystal oscillator
frequency of this microcontroller is 16MHz. It has USB cable which can simply connect with
computer, power barrel jack, reset button and ICSP (In Circuit Serial Programming). Each pin
of the Arduino Uno is operated at 5V.The programming language of this microcontroller is not
complex.
Relay as Controlling Unit
A relay is an electrically operated device as shown in Figure 3.
A relay is a digital switch that controls much higher currents and voltages. This device is widely
used in power protection. The benefits of this device are small in size, stability and long-time
reliable and it can be also used for both ac and dc systems. Relay has three terminals that are
normally closed terminal, normally open terminal and common terminal. It has three pins GND,
VCC and input signal.
Software Used
Software used to control this system is Arduino IDE (Integrated Development Environment).
This software is used to write the program and compile it to the Arduino Uno board. Therefore,
the arduino software commands control the arduino board, sensing devices and another
circuitry.

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Program Code
Int in1=9;
int sensor = 8;
int led = 13;
unsigned long t=0;
void setup()
{
Serial.begin(9600);
pinMode(in1, OUTPUT);
pinMode(sensor, INPUT);
pinMode(led, OUTPUT);
digitalWrite(in1,HIGH);
digitalWrite(led,LOW);
while(millis()<13000)
{
digitalWrite(led,HIGH);
delay(50);
delay(50);
}
}
void loop()
{
digitalWrite(in1,HIGH);
if(digitalRead(sensor)==HIGH)
{
t=millis();
while(millis()<(t+5000))
{
digitalWrite(in1,LOW);
digitalWrite(led,HIGH);
if((millis()>(t+2300))&&(digitalRead(sensor)==HIGH))
{
t=millis();
}
}
}
}

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WORKING OF THE SYSTEM
Arduino is a microcontroller which provides open source platform to perform software and
hardware operations. This is an advantageous project as Arduino Uno and PIR Sensor is used
thereby lights in the room will turn ON automatically by detecting a human motion and stay
turned ON as long as the person remain present in the room. At the beginning, when no human
is present in the room, the PIR Sensor’s OUT pin is in the LOW mode. Hence, light of the room
is OFF.
The output of the PIR Sensor goes HIGH as the person enters the room. PIR Sensor detects the
Infrared (IR) radiation in the room. The Digital pin 8 of Arduino Uno is used to connect the
Data OUT pin of PIR Sensor. When this becomes HIGH, the activation of relay takes place by
Arduino Uno. So that relay pin is in the LOW mode; because relay is an active LOW device.
Now, the lights will turn ON. This light maintains its state as ON as far as there is motion in the
room. If the person exits the room or takes a nap, the motion in front of sensor stops and there
will be no changes in the IR radiations. Therefore, Data OUTpin of PIR sensor will be in LOW
mode. This leads to turn OFF the relay. So, relay now is in the HIGH mode. Hence, room light
will be turned OFF.
CONCLUSION
The paper has introduced the idea of automated homes and proposed a method which saves
power consumption by system. This Automated Gadget Control System having the
interconnections between the home appliances and sensors for controlling and monitoring the
device. Automated home is a vast system that having multiple technologies and its applications
that can be used to provide control and security of the homes easily.
FUTURE WORK
There are many technologies that can be used in automatic lighting systems to make the system
more accurate.To make the system more professional GSM (Global System for Mobile) module
can be used to get notifications. There are some sensors that can be used to control and secure
the home. For example, pressure sensor used to detect the occupancy which will be placed
outside the door. Image processing can also be used to detect a person’s presence by using
digital camera.

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REFERENCES
1) Vibhuti and Shimi S.L., “Implementation of Smart Class Room Using WAGO PLC”,
Proceedings of the Second International Conference on Inventive Systems and Control (ICISC)
2018, Coimbatore, pp. 807-812.
2) A. Maslekar, K. Aparna, K. Mamatha and T.Shivakumara, “Smart Lighting System using
Raspberry Pi”,International Journal of Innovative Research in Science and Technology,
Vol.4(7), 2015, pp.5113-5121I.
3) Suresh S, H.N.S.Anusha, T.Rajath, P.Soundarya and S.V,PrathyushaVudatha. “Automatic
Lighting And Control System For Classroom” 2016 International Conference on ICT in
Business Industry & Government (ICTBIG).
4) Vahid Hassanpour, Sedighe Rajabi, Zeinab Shayan, Zahra Hafezi, Mohammad Mehdi Arefi ,
“Low-Cost Home Automation Using Arduino and Modbus Protocol”, 5th International
Conference on Control, Instrumentation and Automation (ICCIA), Shiraz, 2017, pp. 284-289.
5) https://components101.com/microcontrollers/arduino-Uno

Automatic Room Lights Controller Using Arduino & PIR Sensor

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