DTMF Based Industrial Automation and appliances

control system

Introduction The term “Embedded” it self represents an

inclusion of several independent devices in to a single chip, which is also called a system on chip.

With the invention of VLSI technology it became possible to develop high speed, low cost, low power, and small in size type integrated circuits.

The Micro controller, that used for this purpose is called IBP (Itty Bitty Processor) or Embedded processor.

The versatility of the micro controller can facilitates to extend its wings in to almost all fields, out of which, the industrial applications is one of the most important.

The multi task oriented systems that cause time delays, which may be inefficient in some application, in such case, the micro controllers which can play an important role as an embedded system design is more suitable one.

Here, we design a general purpose embedded system application “TELECONTROLLED DOMESTIC APPLICAION” is the evidence for the efficient use of automation, and is constructed round the micro-controller and DTMF (dual tone multi frequency) receiver.

We found the software suitable for my project work is Kiel, a Micro controller programming tool for ATMEL and other embedded chips and it is also very simple to use and simulate.

The programming required for this project written in Assembly Level Program, compiled and simulated using Kiel simulator.

All errors were removed successfully and final achieved our goal of project.

Power Supply

TANSFORMER

Voltages are required to operate various electronic equipment and these voltages are 5V, 9V or 12V.But these voltages cannot be obtained directly. Thus the a.c input available at the mains supply.A step down transformer is employed to decrease the voltage to a required level.

The primary application of rectifiers is to derive usable DC power from an AC supply. Virtually all electronics except simple motor circuits such as fans require a DC supply but mains power is AC so rectifiers find uses inside the power supplies of virtually all electronic equipment.

RECTIFIERS

FILTER

AC

RECTIFIER OUTPUT

AC+DC DC

PURE DC

Electronic filters are electronic circuits which perform signal processing functions, specifically to remove unwanted frequency components from the signal, to enhance wanted ones, or both.

FILTERS

A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level.It may use an electromechanical mechanism, or passive or active electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.

VOLTAGE REGULATOR

7805

Block DiagramBlock Diagram

DTMF Decoder DTMF Decoder is a very easy to use

program to decode DTMF dial tones found on telephone lines with touch tone phones. DTMF Decoder is also used for receiving data transmissions over the air in radio frequency.

This project displays telephone numbers decoded from tones. A microphone picks up the tones, a preamplifier boosts the signals.

PIN CONFIGURATIONS OF MICROCONTROLLER

1234567891011121314151617181920

4039383736353433323130292827262524232221

P1.0P1.1P1.2P1.3P1.4P1.5P1.6P1.7RST

(RXD)P3.0(TXD)P3.1

(T0)P3.4(T1)P3.5

XTAL2XTAL1

GND

(INT0)P3.2(INT1)P3.3

(RD)P3.7(WR)P3.6

VccP0.0(AD0)P0.1(AD1)P0.2(AD2)P0.3(AD3)P0.4(AD4)P0.5(AD5)P0.6(AD6)P0.7(AD7)EA/VPPALE/PROG

PSENP2.7(A15)P2.6(A14)P2.5(A13)P2.4(A12)P2.3(A11)P2.2(A10)P2.1(A9)P2.0(A8)

AT89C51

Features of AT89C51

1. 4K bytes of Flash, 2. 128 bytes of RAM 3. 32 I/O lines 4. Two 16-bit timer/counters 5. Five vector two-level interrupt

architecture, 6. A full duplex serial port 7. on-chip oscillator and clock circuitry.

Relay Driver

Relay driver act as not logic gate. In this relay driver we can see the N-P-N transistors are placed.When the input give to the driver is low the output of the driver is high. The relays are operated at 12V dc supply

Relay driver schematic diagrams

RELAYS:A relay is an electro magnet controllable switch widely used in industrial controls, automobiles and appliances.

AdvantagesAdvantages

Effective control of home appliances.

Home automation using mobile phone.

Increases power efficiency.

Increases appliances lifetime.

Power wastage is reduced.

Applications

Domestic purpose.

Offices.

Small scale industries.

ConclusionConclusion

This project presents the DTMF based

Industrial Automation and appliances

control system and it is designed and

implemented with Atmel 89S52 MCU in

embedded system domain. The proposed

method is verified to be highly beneficial for

the domestic and industrial purpose.