Internet of Things is a concept where each device is assign to an IP address and through that IP address anyone makes that device identifiable on internet. Basically it started as the “Internet of Computers.” Research studies have forecast an explosive growth in the number of “things” or devices that will be connected to the Internet. The resulting network is called the “Internet of Things” (IoT) [1]. The recent developments in technology which permit the use of Bluetooth and Wi-Fi have enabled different devices to have capabilities of connecting with each other. Using a WIFI shield to act as a Micro web server for the Arduino which eliminates the need for wired connections between the Arduino board and computer which reduces cost and enables it to work as a standalone device. The Wi-Fi shield needs connection to the internet from a wireless router or wireless hotspot and this would act as the gateway for the Arduino to communicate with the internet. With this in mind, an internet based home automation system for remote control of home appliances is designed.

1. DESIGN AND CONSTRUCTION OF SPEED CONTROL OF
AN INDUCTION MOTOR BY USING MOBILE PHONE
THROUGH WI-FI.
Submitted By Supervised By
Ranjan Ray Abdulla Ibna Karim
Reg. No: WUB/09/15/57/2970 Lecture
Suman Majumder Dept. of EEE
Reg. No: WUB/09/15/57/2971 WUB
1

2. Background
Alternating current motors have variable characteristics and are used
extensively in variable-speed drives. AC motor can provide a high starting
torque and it is also possible to obtain speed control over wide range. It is
important to make a controller to control the speed of AC motor in desired
speed. AC motor plays a significant role in modern industrial. These are
several types of applications where the load on the AC motor varies over a
speed range. These applications may demand high-speed control accuracy and
good dynamic responses. AC motors are suitable for belt-driven applications
and the applications where great amount of torque is required. In train and
automotive traction, fuel pump control, electronic steering control, engine
control and electric vehicle control are good examples of these. In aerospace,
there are a number of applications, like centrifuges, pumps, robotic arm
controls, gyroscope controls and so on. For precise speed control of servo
system, closed-loop control is normally used. Basically, the block diagram of
the speed control of AC motor using mobile phone through Wi-Fi.
2

3. Executive Summary
This paper presents speed control of AC motor using an arduino nano series
microcontroller. The speed of AC motor is directly proportional to the voltage
applied across its terminals. Hence, if voltage across motor terminal is varied, then
speed can also be varied. This paper uses the above principle to control the speed
of the motor by varying the duty cycle of the pulse applied to it. The paper uses
two input buttons interfaced to the microcontroller, which are used to control the
speed of motor. PWM (Pulse Width Modulation) is generated at the output by the
microcontroller as per the program. The program can be written in assembly
language or in embedded C. The average voltage is given or the average current
flowing through the motor will change depending on the duty cycle (ON and OFF
time of the pulses), so the speed of the motor will change. A motor driver IC is
interfaced to the microcontroller for receiving PWM signals and delivering
desired output for speed control of a small AC motor.
3

4. Objective
The main objective of this project is to control the speed of an induction motor by
using mobile phone through Wi-Fi .
4

5. Methodology
 Collection of data from books and internet.
 Required components have been purchased from local market.
5

6. Block diagram of the speed control of an induction motor
6

7. Schematic diagram of the speed control of an induction motor

8. Working principle
As shown in above figure transformer T1 step downs 230V AC into 9V
AC and this is given to bridge rectifier. Signal from Android device will be
sent through Wi-Fi. This signal will be communicated with Arduino with
the help of transmitter and receiver of both the devices. This signal will be
represented by a signal letter which denotes the speed and direction of the
motor. There are four different direction of rotation clockwise and
stopping of the motor and these will be represented by different letters.
This letter will vary the speed with reference to the Arduino code forward
direction the transistor. Speed control of motor using mobile phone is
microcontroller based project work on low voltage circuit. In this work
motor speed, motor ON/Off & Load is switched from any where from the
world. In this if we call to our mobile circuit then following functions will
be done.
• If press 1 then motor will ON with Low speed
• If press 2then motor will ON with MID speed.
• If press 3then motor will ON with HIGH speed & Load ON
• If press 4then motor will OFF Motor & Load.
8

9. List of Components with price
9
SI NO Component Name Quantity Price
1 9V Step down Transformer 1 220
2 ESP8266 Node MCU Wi-Fi Module 1 1700
3 AC Motor 1 1000
4 5 Volt relay 4 800
5 TRIAC 1 200
6 DIAC 1 100
7 BC 547 Transistor 4 200
8 LED 7 150
9 Power Switch 1 50
10 7805 Regulator 1 250
11 Resistor-1k 4 80
12 Resistor-100k 1 50
13 Resistor-220k 3 150
14 Resistor-47k 1 50
Total Price 5000
Market Price 6700

10. Advantages
 Efficient and low cost design.
 Easily operate.
 Fast response with the help of resistance control.
 Low power consumption.
10

11. Applications
This can be practically implemented in real time to control the
electrical power usage in
 Industries.
 House hold.
 Shopping malls etc.
11

12. Discussion
As many of the industries use induction motors. So, controlling of induction
motor plays a very vital role. So, our project concentrates on controlling the speed
of induction motor using Android phone remotely by the help of the Wi-Fi
technology. We use Android application which uses Wi-Fi to connect to the Wi-Fi
modem of control circuit which is connected to the motor. Wi-Fi modem is
interfaced with microcontroller. The Wi-Fi slave modem receives the command
from the mobile phone. The Wi-Fi modem sends the signal to the Microcontroller.
The Microcontroller decodes the signal and sends to the relays. Then, respective
relay operates to change the speed of Induction motor from 0% to 100%.We are
not only controlling the speed of the Induction motor, using feedback network we
can also detect the over temperature, high voltage, low voltage, MCB tripping on
account of any faults. And we are also adding an extra application which is very
important in industries. That is, monitoring of phase lines. Because these types of
uncertainties like over temperature, high voltage, low voltage etc are likely to
happen in Industries. So, this project will be very helpful in industries, house hold,
shopping malls etc.
12

13. Conclusion
The project single phase induction motor speed controlling based on Android
mobile phone” was designed such that to control the speed of the AC motor using
Wi-Fi control technique by making use of realy control method to control the
speed of the motor using android mobile with Wi-Fi communication. We are also
monitoring phases. Compared to other methods like frequency control, PWM
method, TRAC control and Thy raster firing angle control this method is less
expensive and design is easy.
13

14. The monitoring and controlling system of the induction motor can be implemented
in the industries and the monitoring values are updated in industrial website for
providing the easy maintenance. The automatic torque and efficiency of the
induction motor can be calculated to improve the performance of the Induction
motor.
Future work
14

15. Practical view of the project
The AC Motor receives power, which is ultimately converted by the AC
Controller into an adjustable frequency. This adjustable output allows the motor
speed to be precisely controlled. Typically, an AC Controller consists of four basic
parts the rectifier, inverter, and the DC link to connect the two.
Fig 1.3: Project
15

16. Thank You
16