26-07-2012, 11:58 AM
AUTOMATIC SPEED MEASURING DEVICE FOR HIGHWAY
AUTOMATIC SPEED MEASURING.pptx (Size: 745.6 KB / Downloads: 71)
INTRODUCTION
This project is used to measure the speed of the vehicles on the highways.
IF AN VEHICL CROSS THE SPEED THEN THIS SYSTEM ACTIVATES
THE CAMERA & OTHER SAFTY INSTRUMENTS FOR THE DETECTION
OF THE VEHICLE.
7805 Voltage Regulator
What is a voltage regulator?
A Voltage Regulator is a semiconductor device that converts an input DC voltage to a fixed output DC voltage
Why 7805?
Features
Output Current up to 1A
Output Voltages of 5 with proper DC
Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe Operating Area Protection
Necessary when you are using a high current source like 6V 4.5 Ah battery to protect your delicate ICs
Circuit discription
System is basically comprises two laser transmitter-LDR sensor pairs. transmitter and LDR sensor of each pair on opposite sides of the road.
Velocity of vehicle is calculated by microcontroller and display on a 16*2 LCD. if this speed is more than the speed of limit an alarm is sounded.
Normally light from laser keep falling on LDR 1 sensor continuously and LDR1 offer a low resistance and pin 4 of microcontroller is high. Whenever light falling on LDR 1 is interrupted by vehicle,LDR 1 resistance goes high and hence pin 4 of microcontroller goes low trigger the microcontroller and counter start ,and similarly at pin 5 light is interrupted miro con. Goes low to trigger the mirocon. And counter stop.mirocontroller is interlay calculated and displayed on LCD.