Ultrasonic distance sensor

An ultrasonic sensor is an electronic device that measures the distance of a target object by emitting ultrasonic sound waves, and converts the reflected sound into an electrical signal.

Coding :

int trigPin = 9;

int echoPin = 10;

int b = 11;

int l = 13;

long duration ;

int distance ;

int sd;

void setup() {

pinMode (trigPin,OUTPUT);

pinMode (echoPin,INPUT);

pinMode (b,OUTPUT);

pinMode (l,OUTPUT);

}

void loop() {

digitalWrite(trigPin,LOW);

delayMicroseconds(2);

digitalWrite(trigPin,HIGH);

delayMicroseconds(10);

digitalWrite(trigPin,LOW);

duration= pulseIn(echoPin,HIGH);

distance= duration*0.034/2;

sd=distance;

if(sd<=35)

{digitalWrite(b,HIGH);

digitalWrite(l,HIGH);

}

else

{digitalWrite(b,LOW);

digitalWrite(l,LOW);

}

}

Video :