Speed Detector using Arduino

Target Problem: In India, many people rash drive their vehicles which causes unnecessary and avoidable accidents to occur. For this purpose, this project is created.

Components Used:

1. Arduino UNO
2. LCD 16x2
3. 2 IR Sensors
4. 10k Potentiometer
5. Breadboard
6. Connecting wires

Circuit Diagram:

Code:

#include <LiquidCrystal.h>
const int rs = 7, en = 6, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int sen1=11;
int sen2=12;
unsigned long t1=0;
unsigned long t2=0;
float velocity;
void setup()
{
lcd.begin(16, 2);
pinMode(sen1,INPUT);
pinMode(sen2,INPUT);
Serial.begin(9600);
lcd.setCursor(0,0);
lcd.print(“ Speed Detector “);
}

void loop()
{
while(digitalRead(sen1));
while(digitalRead(sen1)==0);
t1=millis();
while(digitalRead(sen2));
t2=millis();
velocity=t2-t1;
velocity=velocity/1000;//convert millisecond to second
velocity=(5.0/velocity);//v=d/t
velocity=velocity*3600;//multiply by seconds per hr
velocity=velocity/1000;//division by meters per Km
for(int i=5;i>0;i)
{
lcd.setCursor(3,1);
lcd.print(velocity);
lcd.print(“ Km/hr “);
delay(500);
lcd.setCursor(3,1);
lcd.print(“ “);
delay(500);
}

}

Working:

The working of the Arduino based car speed detector project is very simple. Arduino continuously reads the inputs from the IR Sensors. When a car moving in front of the setup reaches the first sensor, Arduino becomes alert and capture a time stamp the moment the car leaves the first IR Sensor.

Another time stamp is recorded when the car reaches the second IR Sensor. Millis() function of Arduino used for capturing the time stamps.

Arduino then calculates the velocity by assuming the distance as 5 meters between the two IR Sensor and displays the result in kilometers per hour on the 16×2 LCD Display