1. Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
ABSTRACT
For
GSM BASED HOME AUTOMATION USING AVR
Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
-1-

2. Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
PROJECT DEFINITION / SPECIFICATION
PROJECT TYPE
Microcontroller(ATMEGA16)hardware
design
with
software
development (Device Driver) .
PROJECT DESCRIPTION
This Project “GSM BASED HOME AUTOMATION USING AVR
MICROCONTROLLER” is used to control the devices in home as well as in
industries, Banks, and also in Remote areas. Conventionally, wireless-controlled
appliances use RF circuits, which have the drawbacks of limited working range,
limited frequency range and limited control. Use of a mobile phone for device
control can overcome these limitations. It provides the advantages of robust
control, working range as large as the coverage area of the service provider, no
interference with other controllers and up to twelve controls.
In this project, we control home appliances either AC Device or DC
Device controlled by a mobile phone that makes a call to the mobile phone
attached to the control board. In the course of a call, if any button is pressed, a
tone corresponding to the button pressed is heard at the other end of the call.
This tone is called ‘dual-tone multiple-frequency’ (DTMF) tone. The controller
perceives this DTMF tone with the help of the phone stacked in the control board
and operate.
Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
-2-

3. Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
BLOCK DIAGRAM
DEVICE 1
DEVICE 2
DTMF
DECODER
AVR
Controller
DRIVER
UNIT
DEVICE 3
RELAYS
DEVICE 4
RELAYS
RELAYS
PROJECT OUTLINE
 A brief introduction to internal architecture of microcontroller.
 An over view of programming of microcontroller.
 An overview on C language.
 An overview on mechanical arrangement.
 DTMF interfacing with microcontroller.
Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
-3-

4. Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
INTERFACES USED
 Serial communication used for downloading the hex code.
 DTMF circuit interface.
 L293D interfacing
 RELAY interfacing.
SOFTWARES USED
 A Cross compiler for compiling and linking the code written for ATmega16.
 Serial communication software for downloading code to ATmega16.
 Operating system: Windows XP.
Project Definition / Specification
GSM BASED HOME AUTOMATION USING AVR
Confidential
-4-