This document describes two models of a home automation system using IoT. Model 1 uses a NodeMCU, infrared sensor, and relay module to control lights and fans remotely via a smartphone. Model 2 uses an Arduino, DHT11 temperature and humidity sensor, and LCD display to monitor and display temperature and humidity readings. Both models were implemented successfully. The document also provides details on the components, architecture, applications of IoT, and references used.

1. HOME AUTOMATION SYSTEM USING IoT
BY:
RAJBALA PURNIMA PRIYA (BE/15319/15)
Under the guidance of : MAYANK SINGH
DEPARTMENT OF ELECTRICAL AND ELECTRONICS
ENGINEERING
BIRLA INSTITUTE OF TECHNOLOGY,MESRA
BIRLA INSTITUTE OF TECHNOLOGY, PATNA

2. INTRODUCTION
our objectives can be summarised as:
• To be able to control any electrical home appliances using local
internet connection through mobile hotspot . Use of IR(Infrared
sensor) sensor to detect any object in front of sensor and switch
on/off lights and fan accordingly.
• Use of DHT11 (digital temperature and humidity sensor) to
sense temperature and humidity of the room and displaying it on
LCD display with LCD and sensor connected to arduino.

3. INTERNET OF THINGS ( IoT )
The INTERNET OF THINGS (IoT) is an ecosystem of connected
physical devices, vehicles, and home appliances which are
accessible through internet. IoT uses electronics, software,
actuators and connectivity which allow these things to connect,
interact and exchange data .
Fig.1 Ecosystem of Internet of things

4. ARCHITECTURE OF IoT
The Architecture of IoT consists of four important stages. Stage 1
contains sensors and actuators, stage 2 contains Internet
getaways, stage 3 contains cloud server and stage 4 contains
Data center and cloud analytics.
Fig.2 Architecture of IoT

5. APPLICATION OF IoT
IoT promises outstanding opportunities attracting more
organizations seeking for the inclusion of its products in their
business processes . The applications are:
Fig.3 Application Of IoT

6. OUR WORK
For simplification, our project work can be explained in two
categories
MODEL 1 MODEL 2

7. SPECIFICATIONS OF THE COMPONENTS USED
NodeMCU Arduino
UNO
DHT11 Sensor Relay
Module
Infrared
Sensor
16*2 LCD
• Developer :
ESP8266
Open Source
Community
• Type :
Single-board
Microcontrol
ler
• Microcontrol
ler :
ESP8266
• Memory :
128kB
• voltage :
USB (3.3V)
• Operating
voltage :
5V
• Microcontrol
ler :
ATmega-8bit
• SRAM :
2KB
• EEPROM:
1KB
• Flash
Memory :
32KB
• Humidity
Range : 20%-
90% RH
(Relative
Humidity)
• Humidity
Accuracy : (±
5%)
• Temperature
Range : 20-50
(degree
Celsius)
• Temperature
Accuracy : (±
2%)
• Operating
voltage :
5V
• Controlled
by :
Arduino,
NodeMCU
etc
• It has
Status LED
• It is a
switch.
• Operating
voltage :
3.3V - 5V
• Distance
Range:
2cm-30cm
• It has an IR
LED and a
photodiode.
• Detects the
motion.
• Operating
voltage : 5V
• Controlled
by : Arduino,
NodeMCU
etc
• It is used to
display the
characters.
• It has 16
columns and
2 rows.
Table.1

8. MODEL - 1
 This creation is about controlling lights and fans using
NodeMCU and four channel relay module with some jumper
wires.
 NodeMCU has the functionality of Wi-Fi and may be
connected to any Wi-Fi network.
 The communication between the system and the user is
through the internet provided by user’s smart phone.
 An infrared sensor(IR sensor) is also used to detect to the
presence of object in front of sensor . An LED bulb glows
when there is object in front of sensor else it’ll remain off.

9. The circuit connection Of MODEL 1 is as shown:
Relay
module
IR Sensor
nodeMCU
NodeMCU
IR Sensor
Relay
Module

10. MODEL - 2
• This model consists of arduino Uno, DHT11 sensor, LCD
display and jumper wires for connection.
• Arduino board are able to read inputs and turn it into an
output as programmed.
• The process is DHT11 sensor senses the surrounding
temperature and humidity and feeds it into the arduino
board.
• The data fed into arduino is captured by the display showing
the resulted temperature and humidity.

11. The circuit connection Of MODEL 2 is as shown:
Arduino uno
board
16*2 LCD screen
DHT11
sensor

12. RESULTS
• The figure in the next two slide represents successful execution of our
project.
• By Model 1, the end users can control light and fan of the room by using
his or her smart phone. For doing this they only need to enter their
mobile’s hotspot name and it’s password in the programming of arduino
IDE software. Moreover an LED bulb glows when there is object in front of
IR sensor else it’ll remain off. .
• Model 2, being the narrow work on home automation displays the
temperature and humidity of the room on LCD screen every second using
DHT11 sensor, arduino uno and arduino software.

13. Figure showing successful execution of MODEL-2

14. Figure showing successful execution of MODEL-2

15. TABLE 1 REPRESENTING THE COST TO THIS PROJECT
Serial No Components Quantity Prices
1 IR Sensor 1 272
2 PIR Sensor + led 1 85
3 Temperature and humidity sensor
(DHT11)
1 195
4 LCD Screen 1 181
5 Arduino UNO R3 1 450
6 ESP8266 Node mcu 1 250
7 Fan 1 590
8 Bulb 2 189
9 jumper Wires 160 320
10 Bread board 1 205
11 Relay module 1 278
12 Bulb holder 2 30
13 UNO Chord 1 50
TOTAL 3095

16. REFERENCES
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Management,” IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC), 2017.
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Intelligence, 2016
3. R.Piyare, M.Tazil, “Bluetooth Based Home Automation System Using Cell Phone,” IEEE 15th International Symposium on Consumer
Electronics,2011
4. Shiu Kumar, Seong Ro Lee, “Android Based Smart Home System with Control via Bluetooth and Internet Connectivity,” IEEE ISCE, 2014
5. Sonali Sen, Shamik Chakrabarty, Raghav Toshniwal, Ankita Bhaumik, “Design of an Intelligent Voice Controlled Home Automation
System,” International Journal of Computer Applications (0975 – 8887) Volume 121 – No.15, 2015
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4th International Conference on Mechatronics (ICOM) 2011.
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Automation System,” IEEE Conference on Systems, Process & Control (ICSPC2013), 2013
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Communication Technologies (GCCT), 2015.
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Chandigarh, 2015.
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