This document describes a GSM-based home automation system that allows users to remotely control and monitor home appliances via SMS after authentication. The proposed system aims to overcome issues with existing manual systems by allowing remote control and scheduling of devices to save time and energy. The system uses a GSM modem connected to a microcontroller to send and receive SMS commands to control relays and devices like lights and fans. It provides advantages like low cost and global access but has delays due to mobile networks. The system could be enhanced with security cameras for remote monitoring.

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GSM BASED HOME AUTOMATION
YUVARAJA.R B.E ECE
REG NO : 6109314

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NAME : YUVARAJA.R
REGISTER NUMBER : 6109314
LANGUAGE : EMBEDDED C
INTERNAL GUIDE NAME : THAMIL SELVAN.M

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ABSTRACT
Design a system that allows users,
upon authentication, to remotely
control and monitor home
appliances using a Gsm-modem.
GSM BASED HOME AUTOMATION

4. EXISTING SYSTEM
 Human can power on the motor ,light ac etc.
But power off some due to memory loss they
cannot power off the applications.
 Some time advanced power on of
applications is not possible. So human can
power on applications manually.
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5. PROPOSED SYSTEM
 To overcome the existing problem, we construct a model the
project is a clear indication of a multi purpose control done via
sms reducing the manual efforts and time required while paying
individual attention for controlling each device.
 At time night are automatically using sensors it will saves time
and energy of the individual.
 The system requires less design and implementation cost. For
handicapped people it may be really not entertaining to involve
much in manual work and this system helps them to locate
themselves in a place and operate the lights of their room,
switch on the fan etc.

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6. 6
Project in Action – Entire System
GSM BASED HOME AUTOMATION
LDR

7. COMPONENTS DESCRIPTIONS
 GSM Modem:
GSM Modem receives the signal and converts the data and pushes instruction to microcontroller.
 MAX232 Circuit:
It is an interface between GSM Modem and Microcontroller.
 AT89C51 Controller:
This is the heart of the control system which control the device(s) based on the SMS.
 ULN 2003 to Driver:
It is power driver circuit that controls the relay(s).
 Relay:
The Relay is connected to the output device(s).
 LCD Display:
This displays the status of the device.
 LDR:
Light dependent resistor using light intensity dependent to lights on
 Embedded C Language:
The software is used to program the MICROCONTROLLER Controller.
 Controlled Device:
The wide variety of home appliances and such as Lights, Fans, etc. can be connected.
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8. EVOLUTION OF GSM
 GSM is a global system for mobile communication GSM is an international
digital cellular telecommunication. The GSM standard was released by ETSI
(European Standard Telecommunication Institute) back in 1989. The first
commercial services were launched in 1991 and after its early introduction in
Europe; the standard went global in 1992. Since then, GSM has become the
most widely adopted and fastest-growing digital cellular standard, and it is
positioned to become the world’s dominant cellular standard.
 1G Analog Communication
 2G Digital Communications
 2.5G GPRS
 2.75G EDGE
 3G Enhanced feature of Video call
 4G High-speed Wireless Broadband
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9. SMS IN GSM
 SMS stands for Short Message Service. It is a technology that
enables the sending and receiving of message between mobile
phones.
 SMS first appeared in Europe in 1992. It was included in the
GSM (Global System for Mobile Communication) standards
right at the beginning.
 Later it was ported to wireless technologies like CDMA and
TDMA. The GSM and SMS standards were originally
developed by ETSI. ETSI is the abbreviation for European
Telecommunication Standard Institute.
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10. COMMANDS USED IN GSM MODEM
AT <ENTER>
AT+CMGF=1 <ENTER>
AT+CNMI=1,2,0,0,1 <ENTER>
AT+CMGR=2 <ENTER>
AT+CMGD=2 <ENTER>
AT+CMGS="+9791260935" <ENTER>
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11. MICRO CONTROLLER
AT89C51RD2BN
Features:
 Compatible with MCS-51® Products
 8K Bytes of In-System Programmable (ISP)
 Write/Erase Cycles
 4.0V to 5.5V Operating Range
 Fully Static Operation: 0 Hz to 33 MHz
 Three-level Program Memory Lock
 256 x 8-bit Internal RAM
 32 Programmable I/O Lines
 Three 16-bit Timer/Counters
 Eight Interrupt Sources
 Full Duplex UART Serial Channel
 Low-power Idle and Power-down Modes
 Interrupt Recovery from Power-down Mode
 Watchdog Timer
 Power-off Flag 11 GSM BASED HOME AUTOMATION

12. SMS RESPONDING HARDWARE CONTROL
COMMANDS LIST
12

13. ADVANTAGES
 Global Range
 Low Cost
 Low Power Requirement
GSM BASED 13 HOME AUTOMATION

14. DISADVANTAGES
 Delays in mobile networks
 Need of a mobile phone entirely dedicated for the system
GSM BASED 14 HOME AUTOMATION

15. CONCLUSION
 Recent development in Science and Technology provide a
wide range of scope of application of reduction power wastage.
 This project is useful in the domestic as well in the industrial
applications. It has the scope to enhance several devices by
appropriate add-on circuits.
 Even the Vibration , Glass Break, Fire or Smoke detector can
be configured to report to the user. The cost involved is
moderate and the status can be sent to the user(s) for the
decision
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16. FUTURE ENHANCEMENT
 In this project in future we can add a
multimedia camera to see what is going
inside the home by sitting in office or
somewhere.
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17. THANK YOU
GSM BASED 17 HOME AUTOMATION