Wireless Automatic Station Identification System with

Announcement

Group Member Girish Gujar. TU1S0809007 Mahendra Bangar. TU1F0607062 Sushil Meher TU1F0607032

UNDER THE GUIDENCE

Mrs. S.B GAIKWAD

Radio frequency technology

Transmission of binary code

Signal capturing by receiver

Detection of code

Announcement by speaker

Display by LCD

Introduction

Background overview

A. Existing System.

B. Drawbacks of Existing System.

Transmitter on stops

Battery Power Supply

RFEncoder

RF Transmitter

Antenna

Switches

LCD 16*2

RF Receiver

RF Decoder Microcontroller

Power Supply MIC Amplifier

Voice ICSPK

Amplifier

Antenna

Microphone Speaker

Receiver in buses

Technology & Programming Language

Embedded Technology.

8051 Family based controller.

Embedded C-keil compiler.

Eagle Software for PCB designing.

System OrganizationSystem Organization

LCD 16×2

It is called Liquid Crystal Display.

This will be connected to microcontroller.

The job of LCD will be to display all the system generated messages coming from the controller.

This display contain two internal byte-wide register ,one for command and second for character to be display.

LCD will provide interactive user interface.

RF Encoder HT12E

This unit used to encode the 4-bit data before

transmitting it is the communication channel.

Basically it generates a serial bit stream of the parallel

input data bit.

It then sends data stream to RF transmitter unit.

This unit requires +5V to 12V DC for it proper operation

TLP434A Ultra Small Transmitter Diagram

Frequency 315,418 and 433.92 MhzModulation : ASKOperation Voltage: 5-12 V DC

Voice IC

This unit is the only analog IC used in whole project.

It has the capability to sample & store the voice signal at 8KHz.

It is re-recordable IC . It can store voice of up to 8 min. duration .

This will be interface with microcontroller using SPI (Standard Peripheral Interface) protocol.

This unit requires +ve 3.3V DC for it’s proper operation.

RF Decoder HT12D

• This unit used to decode the 4-bit after receiving it from the RF receiver unit.

• Basically it generates a parallel data from the serial incoming bit stream.

• This unit requires +5V to 12V DC for it proper operation

Frequency 315, 418 and 433.92 MHzModulation : ASKSupply Voltage : 3.3 - 6.0 V DCOutput : Digital & Linear

RLP 434A SAW Based Receiver Diagram

Features

RF Based wireless Link at 1200bps,

ASK Modulation at 434MHz,

Up to 120ft.range,

Customized re-recordable Voice IC,

Keeps on repeating the announcement till in

the range of the stop.

Fully automatic, no manual trigger required.

Advantage

This system will be useful for effective time utilization of passenger.

Increase passenger satisfaction.

Higher efficincy of bus operation & passenger oriented transportation system.

Fully Automatic .

Limitation

Range is limited to 120fts only.

Modulation is ASK Which provides some noise.

Only 16 stop ID can be generated.

Drawbacks

Installation of RF transmitter required at all stops.

Installation of RF receiver required in all buses.

Future Modifications

Range can be increased up to 100meter.

FSK Modulations can be used for error free

transmission.

More stop ID can be generated.

Higher capacity voice IC can be used.

Area based advertisement can be added.

APPLICATIONS

In Public Transport System.

Can be use as a Bus rout indicator.

References

Embeded BooksI. Microcontroller & Embeded system by

Mazidi, Kenneth Ayala• Electronic BooksI. Ramkant Gayakwad,Boylestad• WebsitesI. www.keil.comII. www.wikipedia.comIII.www.beyondlogic.com

Thank You