A Project report on

DTMF Based Home Automation System

AT

Nitte Meenakshi Institute of TechnologyYelahanka Bangalore, India

Submitted by:-

Kamal Lamichhane 1NT11EC043

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.

INTRODUCTION Home/Industrial automation system

Home/ Industrial automationSystem

Call Centers &Security system

Industrial Devices

Home Appliances

Eg.Oven,AC,Fan etc.

Project in Action – Cellular Phone Communication

4

Thermostat

Fan

Lamp

Con

troll

ed

D

evi

ces…

Home automation systemHome 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.

Block diagram showing the system

Need of Automationi. Saves timeii. Save money(long run)iii. Self maintenanceiv. Securityv. Makes life easier

DTMF signalsDtmf(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.

DTMF frequency combination

Dtmf signalling applicationDtmf 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.

Cellular Phone CommunicationTechnologies 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

Mobile N/W & Remote controlSMS BasedDTMF BasedGSM Based logging

Mobile service Transmitter Antenna/ Tower

Gsm/ Cdma N/w

Receiver TowerMobile services

Connection of circuit

- Supply

Relay Board

bulb

Motherboard

C NO

C-commonNO-normally open

Home appliances

AC

Fan

Oven

Relay

System requirement1.Hardware Requirementi. DTMF moduleii. Relay (Required voltage )iii. A mobile phoneiv. AC devices eg.bulb,fan,ac etc.v. Motherboards

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

Image of Connection

Image of software RobotC

Programming in RobotC

Steps carried out for controllingthe appliances

QUERIES SECTION

Wana ask queries ?

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