This document describes a student project to create a remote home appliance control system using a microcontroller, GSM modem, and SMS messages. The system allows users to control devices like lights and fans from anywhere via a mobile phone. It aims to provide a low-cost alternative to existing wireless home automation technologies. The document outlines the project objectives, hardware components, software, applications, advantages, and conclusions.

1. Prof. Subhransu Sekhar panda
(ECE department)

2. Team Members :-

3. Reasons for choosing this
project :-
Objective of this project is to control our home appliance
from remote area.
 There are many home wireless based devices for
controlling processes, but they are more expensive.
 So here we are using all the basic components that are
used in our daily life like cell phones, Sim card, GSM modem
etc which make our project cheaper and very simple to use.

4. Project details :-
 Aim of the ‘project ‘ Is to develop a system based on
Embedded micro controller ,which is used for controlling various
appliances at home using GSM network and which provides a
security feature.
The major hardware interfaces to micro controller are LCD
display and a modem(GSM).Also the appliances are interfaced to
the micro controller that are to be controlled.
 A serial driver IC is used for serial data transmission.

5. Block diagram :-
Appliance 1
Display Unit
RELAY Relay 1
GSM DRIVER
modem
Relay2
AT89C51
Serial Appliance 2
driver Micro Power
supply unit
Controller

6. POWER SUPPLY CKT.
POWER SUPPLY
7805 +5V
1k
transformer
9-0-9Vac/1Amp
LED
230VAC - +
7812 +12V
50Hz 2.2k
IN4007 * 4
1000u F/35V
LED
GND

7. RELAY :
•A relay is used to isolate one
electrical circuit from another.
• It allows a low current control
circuit to make or break an
electrically isolated high
current circuit path.

8. LCD DISPLAY
Enable (E)-This line allows access to the display through R/W and RS lines. When
this line is low, the LCD is disabled and ignores signals from R/W and RS.
When (E) line is high, the LCD checks the state of the two control lines and responds
accordingly.
Read/Write (R/W)-This line determines the direction of data between the LCD and
microcontroller. When it is low, data is written to the LCD. When it is high, data is
read from the LCD.
Register select (RS)-With the help of this line, the LCD interprets the type of data on
data lines. When it is low, an instruction is being written to the LCD. When it is
high, a character is being written to the LCD.

9. 8051 Microcontroller

10. 8051 microcontroller
Features of 8051
i. RAM – 128 Bytes (Data memory)
ii. ROM – 4Kbytes (ROM signify the on – chip program space)
iii. 32 I/O lines.
iv. Serial Port – Using UART makes it simpler to interface for serial communication.
v. Two 16 bit Timer/ Counter
vi. Input/output Pins – 4 Ports of 8 bits each on a single chip.
vii. Harvard Architecture – It has 16 bit Address bus
viii. 8051 can execute 1 million one-cycle instructions per second with a clock
frequency of 12MHz.

11. GSM MODEM

12. GSM is the most popular standard for mobile phones in the
world. It is based on TDMA (time division multiple access)
technology.
We are using the SIMCOM 300, a GSM modem . This is a
powerful GSM/GPRS Terminal with self-contained unit.
This has standard connector interfaces and has an integral SIM
card reader. The modem has a RJ9 connector through which a
speaker and microphone can be connected allowing audio calls
being established, but this feature is not utilized in this project
as only data transfer is needed.

13. Software used :-
 Windows 2000 & onwards version
 Embedded c
 Keil software (Programming language for the communication between
the Micro controller and the GSM modem)
 Proteus software(simulation)

14. Hardware used :-
 AT89C51 microcontroller
Relay circuit
Relay drive
 Serial communication RS 232 protocol
 GSM modem
 LCD

15. Lab setup:-
Setup is in such a way that it contains proper atmosphere
and safe instrumentation.
The GSM module was properly aligned with microcontroller.
 Soldering has been firmly done to reduce loose connection
and short circuit.
All safety measures are taken to prevent electric hazard.
 A pc with all the software
Measuring instrument

16. Application :-
Appliance control
Control of doors and windows shutters
Home entertainment system
Security system

17. Advantages:-
 simple and easy to access
 Accessed from remote area
 Low power consumption
 Taking measures to reduce the electricity bill.
 portability

18. Future enhancement :-
It can be used as
•Controlling speed of fan
•Controlling room
temperature
• Recording our favorite TV
program when we are outside
from our home.
It can be used for security
proposes
•burglary
•gas detection
•smoke detection

19. conclusion:-
This document presents a mobile controlled and user-
friendly approach to the available home automation
system. This system can easily be implemented because
of its wireless communication standards.
Till now, we have researched the literatures for all the
topics that include GSM automation system using SMS.
Then we have to built the main control program, hardware
and the warning system via GSM network (with SMS).

20. Bibliography :-
Microcontroller ( theroy and application ) By Ajay V Deshmukh
The tata McGraw-Hill companies
“The 8051 Microcontroller and Embedded systems” by Muhammad
Ali Mazidi and Janice Gillispie Mazidi , Pearson Education
Circuitstoday.com
Edaboard.com
Vegarobokit.com
Electronics.com
Developershome.com
Seminarproject.com