speed checker

7/31/2019 Speed Checker

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INTRODUCTION Road accident scenario in the country is a gr

concern.

In the last 6 months 2132 were killed and 12872injured in road accidents.


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Reasons:- Speed violations

Increase in number of vehicles.

Narrow and congested roads.

Rash and negligent driving.


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Speed checker come handy for traffic police.

Compact & user friendly

Displays speed also sounds alarm on overspe


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IR sensors detect presence of vehicle 2 IR sensors are placed at a fixed distance

When Vehicle passes 1st sensor count up timer

When Vehicle passes 2nd

sensor count up timestopped

Distance is already fixed.


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BLOCK DIAGRAM

IR TRANSMIT2

IR TRANSMI

1IR RECEIVER 1

IR RECEIVER 2

BUZZERPOWER

SUPPLY PIC16F877A

LCD

Vehicle


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Block diagram consists of:-

Power Supply

Microcontroller

IR transmitter

IR receiverLCD module

Buzzer


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Power Supply

Includes step down transformer, bridge rectifiregulator and load.

Converts 230V,50 Hz ac to 5V regulated power


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MicrocontrollerPIC 16f877

Ports used:-PORT B, PORT C, PORT D

Timers:-Timer 1, Timer 2

EEPROM


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IR Transmitter IR LED is the transmitter Transmits 38KHz IR rays.

IR Receiver TSOP 1738 Receives 38 KHz IR rays. Output is low when IR rays are received and is high wh

an iterruption.


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LCD Moduleo Displays speed

o HD44780

o 16 x 2 line display

o PORT D is used for controlling LCD

o DB4-DB7 data lines


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Buzzer Indicates over speed

Piezoelectric buzzer

Made from two conductors separated by piezcrystals.


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Circuit Diagram


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Flow ChartSTART

Initialize PIC and LCD

SET overflow=0

Display SPEED CHECKER

Ifsensor 1=1


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CALL interruptsubroutine

If

sensor2=1

count1=TMR1HTime=Overflow*0.262;

Time=Time+(count1*0.001);

Speed=(1/Time) * 3.6;

Ifspeed>

75


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speed checker

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