This project demonstrates a method to remotely control home appliances and systems using a mobile phone interface. A microcontroller-based control unit is connected to appliances and relays. A GSM modem allows sending commands from a mobile phone to the control unit for authentication and activating appliances. The system was designed and its components like the microcontroller, GSM module, relays and power supply are described. It provides wireless remote control of appliances using a mobile phone which could revolutionize home automation.

1. SAI SPURTHI INSTITUTE OF TECHNOLOGY
(An ISO 9001:2011 Certified Institution & Accredited by NAAC-UGC)
DEPARTMENT OF ELECTRICALAND ELECTRONICS ENGINEERING
AUTOMATION OF LOAD USING MOBILE PHONE
MAIN PROJECT REVIEW
ON
PRESENTED BY:
CH.D.S.S.CHARAN (12C51A0214)
J.RAVI (12C51A0224)
B.VEERENDRA BABU (12C51A0211)
PROJECT GUIDE
Mr.A.GOPI
M.Tech (PE&ED)
PROJECT INCHARGE HEAD OF THE DEPT
Mr.V.ASHOK Mr.K.R.K.PRASAD
M.Tech (PE&ED) M.Tech(PE)

2. ABSTRACT
This project demonstrates a novel method which
enable users to control their home appliances and
systems from remote using a cell phone-based
interface. To access the control unit, the user should
send an authentication code along with the
required/desired function/action to his/her home
control system via Global System for Mobile
communication(GSM). Upon being properly
authenticated, the cell phone-based interface at home
(control unit) would relay the commands to a
microcontroller that would perform the required
function/action, and return a function completion code
that would be sent to the source of the original
command (user’s cell phone).

3. BLOCK DIAGRAM
AT89S52
Micro
Controller
Display Unit
Power
supply unit
GSM
modem
Relays
Appliances
RELAY
DRIVER
Serial
driver

4. CIRCUIT DIAGRAMCIRCUIT DIAGRAM
POWER SUPPLY

5. EQUIPMENTS
• Microcontroller based control
system with regulated power supply
• Relay driver
• Gsm module
• Voltage regulator
• mobile phone

6. S.NO COMPONENT RANGE/TYPE QTY COST(RS/-)
1 Transformer 12-24 V 1 100
2 LCD 5V(16X2) 1 150
3 GSM 3.6-4.6(SIM900) 1 2000
4 7805 7- 35 V 2 30
5 7812 14-35 2 30
6 A989S52 4.5-5.5V 1 80
7 RELAYS 12V(SPDT) 6 200
8 ULN2003 12-35V 1 25
9 CAPACITOR 1000 UF/25V 1 10
10 CAPACITOR 10 UF/50V 5 30
11 MAX232 4-5V 1 30
12 DIODE IN4007 5 10
13 LED 1.5-3.5V(5mm) 5 10
14 40 Pin Base 1 20
15 16 Pin Base 2 20
16 dot pc board 4x4 4 200
17 connectors 10 200
18 Resistors 1k 10 20
19 TOTAL 3165
COMPONENTS & COST

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. GSM MODULE
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 900, 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.

9. CONCLUSION
Mobile phones have become an indispensable part of our life. Our
system uses a controller and a cellular phone for its operations. The
systems can be used as a test bed for any application that requires on-
off switching based applications. Wireless controlled home appliances
in the comforts of any environment will revolutionize our way of
living. Controlling appliances remotely by a cell phone will one day
become a reality and one should give thanks to the capabilities of
HACS. HACS might one day become a standard system in the new
homes to come.

10. THANK YOU

11. POWER SUPPLY