This project aims to design a home automation system that allows users to remotely control and monitor home appliances like lights, fans, AC, etc. using a cell phone. It uses a DTMF module and relays to control the appliances circuitry. The system receives commands from a mobile phone through DTMF tones and operates the appliances accordingly. It provides benefits like saving time, reducing costs, and increasing security and convenience. The document discusses the need for automation, working of DTMF signals, cellular communication technologies considered, system requirements including hardware and software, and programming steps to control appliances remotely.

1. AT
Nitte Meenakshi Institute of Technology
Yelahanka Bangalore, India
Submitted by:-
Kamal Lamichhane
1NT11EC043

2. Abstract view of project
i. This project is mainly concerned with design a
system that allows users, upon authentication, to
remotely control and monitor multiple home
appliances using a cell phone-based interface.
ii. In this project we make the use of DTMF module
and relay to control the circuitry.

3. INTRODUCTION
Home/Industrial automation system
Home/ Industrial automation
System
Call Centers
&
Security
system
Industrial
Devices
Home
Appliances
Eg.Oven,AC,
Fan etc.

4. Project in Action – Cellular Phone Communication
4
Thermostat
Fan
Lamp
ControlledDevices…

5. Home automation system
 Home appliances control system accessed by a remote
device such as mobile phone or palm-top(pc) to allow
a home owner to control, monitor and co-ordinate
home appliances.
 HACS is a system which provides various services to
remotely operate on home appliances. The HACS
system receives command from remote devices that
are manipulated by users.

6. Block diagram showing the system

7. Need of Automation
i. Saves time
ii. Save money(long run)
iii. Self maintenance
iv. Security
v. Makes life easier

8. DTMF signals
 Dtmf(direct tone multifrequency) is a signaling system
for identifying the keys or better says the number
dialed on a push button or dtmf keypad.
 Dtmf is a multifrequency tone dialing system used by
the push button keypads in phone and mobile sets to
conveys the number or key dialled by the caller.
 Dtmf has enabled the long distance signalling of
dialling numbers in voice frequency range over
telephone lines.
 Dtmf as name suggests uses a combination of two sine
waves tones to represent a key.

9. DTMF frequency combination

10. Dtmf signalling application
 Dtmf tones are thus mainly used at the telephone
switching centers for detection of dialled/called
number.
 IVR systems, call centers, security systems.
 Dtmf tones were also used by terrestrial stations for
turning on and shutting off remote transmitters.

11. Cellular Phone Communication
Technologies Considered
 Tone Decoding (DTMF) Features
 High Compatibility with all cell phone models
 Limited user interaction
 More prone to user error (uneditable)
 Inefficient, time consuming
 Additional hardware required (convert sound to binary)
 Text Messaging (SMS) Features
 Data transmitted in binary form (ASCII)
 Message can be edited prior to sending

12. Mobile N/W & Remote control
 SMS Based
 DTMF Based
 GSM Based logging
Mobile service Transmitter
Antenna/ Tower
Gsm/ Cdma N/w
Receiver
TowerMobile services

13. Connection of circuit
-
Supply
Relay Board
bulb
Motherboard
C NO
C-common
NO-normally open
Home appliances
AC
Fan
Oven

14. Relay

15. System requirement
1.Hardware Requirement
i. DTMF module
ii. Relay (Required voltage )
iii. A mobile phone
iv. AC devices eg.bulb,fan,ac etc.
v. Motherboards

16. .
2.Software Requirements:-
i. RobotC
ii. Hyper term for manual operation
Programming is done in simple c language.

17. Image of Connection

18. Image of software RobotC

19. Programming in RobotC

20. Steps carried out for controlling
the appliances

21. QUERIES SECTION
Wana ask queries ?
?