Unmanned railway tracking and anti collision system using gsm
INTRODUCTIONEmbedded System is a combination ofhardware and software used to achieve a singletask. It is a computer system that monitorrespond to, or control an external environment.Environment are connected to systems throughsensors, actuators and other I/O interfaces.Embedded system must meet timing and otherconstraints imposed on it by environment
SYNOPSISThe project aims at designing Anti-Collision System andcontrolling unmanned Railway crossings. The anti-collisionsystem is implemented by fitting GPS receiver in each train.Each train will compare the GPS co-ordinates sent by theneighboring trains with its own GPS co-ordinate system. Whenthe difference between the trains coming in same GPS co-ordinate reaches minimum level, then both trains will stop.When the train reaches the spot where the IR sensors areplaced the close command for gate control system is activated.The received location will send form the server in the form ofGSM modem and the server will response the position of thetrain. The information will be send from the main server withthe location of the train. The control of unmanned railwaycrossing is implemented by placing display as well as alarmindicator in the train so that they can find the each trainlocation in the same track about few kilometers before thecrossing area.
MICROCONTROLLER The AT89C51 is a low-power, high-performance CMOS 8-bit microcomputer It has 4Kbytes of Flash programmable anderasable read only memory (PEROM). AT89C51 is a powerful microcomputerwhich providesa highly-flexible and cost-effective
FEATURES • 128 x 8-bit Internal RAM • 32 Programmable I/O Lines • Two 16-bit Timer/Counters • Six Interrupt Sources • Programmable Serial Channel • Low-power Idle and Power-down Modes • Fully Static Operation: 0 Hz to 24 MHz
OBSTACLE SENSORModulated IR transmitterAmbient light protected IR receiver3 pin easy interface connectorsIndicator LEDUp to 12 inch range for white objectCan differentiate between dark and light colours
RELAYA relay is an electrical switch that opens and closesBy the control of another electrical circuit it works.The switch is operated by an electromagnet to openor close one or many sets of contacts.It can able to control an output circuit of higherpower than the input circuit.
RF TRANSMITTER &RECEIVER The transmitter/receiver (Tx/Rx) pair operates at a frequency of 434MHz An RF transmitter receives serial data and transmits it wirelesslythrough RF through its antenna The transmission occurs at the rate of 1Kbps - 10Kbps The transmitted data is received by an RF receiver operating at thesame frequency as that of the transmitter.
RS 232 Highly Reliable for 24x7 operation withSMPS power supply adapter / MatchedAntenna Status of Modem Indicated by LED Simple to Use & Low Cost Quad Band Modem supports all GSMoperator SIM cards
GSM MODEMIt is a specialized type of modem which accepts a SIMcardoperates over a subscription to a mobile operatorIt is used for sending and receiving SMS and MMSmessages.From the mobile operator perspective, a GSM modemlooks just like a mobile phone.
IR LEDAn IR LED, also known as IR transmitterIt is a special purpose LED that transmits infraredrays in the range of 760 nm wavelength.It is made of gallium arsenide or aluminium galliumarsenideIR receivers, are commonly used as sensors
ENCODER 18 PIN DIP Operating Voltage : 2.4V ~ 12V Low Power and High Noice ImmunityCMOS Technology Low Standby Current and MinimumTransmission Word Built-in Oscillator needs only 5% Resistor Easy Interface with and RF or an Infraredtransmission medium
DECODER18 PIN DIP8 ~ 12 Address Pins and 0 ~ 4 Data PinsEasy Interface with an RF of IRtransmission mediumMinimal External ComponentsCapable of Decoding 12 bits of Information
ANTI COLLISION DEVICEThe Anti Collision Device is a form of Automatictrain protectionACDs have knowledge embedded intelligenceThey take inputs from GPS satellite system forposition updatesIt act as a watchdog in the dark as they constantlyremain in lookout for other train bound ACDs
SEND SMS USING AT COMMANDSSome advanced GSM modems like WaveCom andMultitech, support the SMS text modeThis mode allows you to send SMS messages using ATcommands, without the need to encode the binaryPDU field of the SMS first.This is done by the GSM modem
SENDING THE MESSAGETo send the SMS message, type the followingcommand:AT+CMGS="+31638740161" <ENTER>
SETTING UP THE MODEMIf the modem contains a SIM card with is secured with aPIN code, we have to enter this pin code first:AT+CPIN="0000" <ENTER>
CHECK YOUR GSM MODEM SUPPORTSMS TEXT MODETo check if your modem supports this text mode, youcan try the following command:AT+CMGF=1 <ENTER>
SCOPE FOR ADVANCEMENTTrain information is transmittedto next station and road traffic