Question

If i want to design speed breakers using ultrasonics sensor for measuring speed of the car and if the speed greater than or equal 25km /h trun the LED green and open the lock

And if the speed more than 25km/h turn the LED red and close the lock using ardoino program

Answer 1

You need the following components to design this system:

Nano Arduino

Battery

Battery Connector

Ultrasonic sensor

Buzzer or similar alert system

First connect ultrasonic sensor to arduino. Then connect this system to the battery using connector. Connect this to the buzzer.

please find the code below:

## defining the pins connection

const int trigPin = 12;

const int echoPin = 11;

const int buzzerPin = 13;

// defines variables

int setDistance=20;

int GetDistance()

{

long duration;

int distance;

// Clears the trigPin

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

// Calculating the distance

distance= duration*0.034/2;

return distance;

}

void setup() {

// put your setup code here, to run once:

// initialize the digital pin as an output.

// Pin 13 has an LED connected on most Arduino boards:

pinMode(trigPin, OUTPUT); // trigPin as an Output

pinMode(echoPin, INPUT); // echoPin as an Input

pinMode(buzzerPin, OUTPUT);

Serial.begin(9600);

delay(1000);

//setDistance= GetDistance();

//setDistance=8;

}

void loop() {

Serial.print(“Current Distance: “);

Serial.print(GetDistance());

Serial.print(” Set Distance: “);

Serial.println(setDistance);

if(GetDistance()<setDistance-1)

{

digitalWrite(buzzerPin, HIGH);   // LED on

}

else

{

digitalWrite(buzzerPin, LOW);   // LED light on

}

delay(5000);

}