Nitte Meenakshi Institute of Technology
Yelahanka Bangalore, India
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.
Home/Industrial automation system
Home/ Industrial automation
Project in Action – Cellular Phone Communication
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
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.
Need of Automation
i. Saves time
ii. Save money(long run)
iii. Self maintenance
v. Makes life easier
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
Dtmf as name suggests uses a combination of two sine
waves tones to represent a key.
Dtmf signalling application
Dtmf tones are thus mainly used at the telephone
switching centers for detection of dialled/called
IVR systems, call centers, security systems.
Dtmf tones were also used by terrestrial stations for
turning on and shutting off remote transmitters.
Cellular Phone Communication
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
Mobile N/W & Remote control
GSM Based logging
Mobile service Transmitter
Gsm/ Cdma N/w
Connection of circuit