By:

RAHUL KUMAR RUDRA PRASAD BHUYAN SOUGATA DAS

INTRODUCTION

• In the present world of wireless technology every

thing is going to be digital and wireless, and the

cell phone is the key player in wireless

technology today.

• And today technology made the possessing of a

mobile, considered as a basic commodity.

• And the trends in wireless technology changing

day-by-day and today the working is going on

how to develop remote devices with out the

presence of man and to reduce to the time factor

and labor, and our project belongs to that race

and by using it we can control any electronic

devices through a touch cell phone, with one

Call.

Presentation outline• Project is like how to control

electronic devices by using cell phone.

• The Components used are two Nokia Mobiles , a PC, and a Microcontroller.

• The Electronics devices that are demonstrated in the project is a calling bell, a motor and a mini fan.

• How ever by making small changes any electronic devices can be controlled.

PCB

Remote Unit

Master Unit

ComputerElectronic Devices

Overview Diagram of the project

Major components of the project• Microcontroller.

• Mobile.

• DTMF.

• Relay Unit.

• Loads [2].

• Power Supply

Software requirement• Embedded C Programming

• Keil Cross Compiler

Block diagram

Load1

Load2

Controller

Relay Un DTMF

Power Supply

Mobile

DTMF (Dual tone multi Frequency)• Dual Tone Multi-Frequency, or DTMF, is a

method for instructing a telephone switching system of the telephone number to be dialed, or to issue commands to switching systems or related telephony equipment.

• The version of DTMF used for telephone tone dialing is known by the trademarked term Touch-Tone (canceled March 13, 1984), and is standardized by ITU-T Recommendation Q.23. It is also known in the UK as MF4.

Features• Low MIPS: 0.25 /0.35 MIPS for 10 ms and 5 ms

frame size versions respectively• Designed as a telecom system component rather

than a stand-alone algorithm.• Can be configured on the fly, and such

parameters as twists, frequency acceptance, spectrum Cleanness, and signal duration thresholds can be altered during a call.

• Does not use notch filters to suppress dial tone, so it tolerates relatively high-level echo dial tone (15…20 dB above DTMF level) even if its frequencies are quite different from the nominal, exceeding standard +/-0.5% tolerance

AT89s52 Microcontroller:Features:•Compatible with MCS®-51 Products•8K Bytes of In-System Programmable (ISP) Flash Memory – Endurance: 1000 Write/Erase Cycles•4.0V to 5.5V Operating Range•Fully Static Operation: 0 Hz to 33 MHz•Three-level Program Memory Lock •256 x 8-bit Internal RAM•32 Programmable I/O Lines •Three 16-bit Timer/Counters•Eight Interrupt Sources •Full Duplex UART Serial Channel•Low-power Idle and Power-down Modes •Interrupt Recovery from Power-down Mode •Watchdog Timer •Dual Data Pointer•Power-off Flag •Fast Programming Time •Flexible ISP Programming (Byte and Page Mode) •Green (Pb/Halide-free) Packaging Option

PIC CONTROLLER Features:

• High-Performance RISC CPU• Only 35 single-word instructions to learn • All single-cycle instructions except for program branches,

which are two-cycle• Operating speed: DC – 20 MHz clock input DC – 200 ns

instruction cycle• Up to 8K x 14 words of Flash Program Memory, Up to 368 x

8 bytes of Data Memory (RAM), Up to 256 x 8 bytes of EEPROM Data Memory

• Pin out compatible to other 28-pin or 40/44-pin• PIC16CXXX and PIC16FXXX microcontrollers

Power supply• A 230v, 50Hz Single phase AC power

supply is given to a step down transformer to get 12v supply. This voltage is converted to DC voltage using a Bridge Rectifier.

RELAYA relay is an electrically operated switch

Advantages of relays: •Relays can switch AC and DC, transistors can only switch DC. •Relays can switch high voltages, transistors cannot. •Relays are a better choice for switching large currents (> 5A). •Relays can switch many contacts at once.

Disadvantages of relays: •Relays are bulkier than transistors for switching small currents. •Relays cannot switch rapidly (except reed relays), transistors can switch many times per second. •Relays use more power due to the current flowing through their coil. •Relays require more current than many ICs can provide, so a low power transistor may be needed to switch the current for the relay's coil.

Main circuit diagram

conclusion• The system makes daily life easier

by allowing user to control the home accessories by a mobile.

• The system is also very useful in terms of industrial practice.

Thank you