ultrasonic

ultrasonic

const int trigPin=4;

const int echoPin=6;

long duration;

int distance;

void setup() {

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

  Serial.begin(9600);

  pinMode(trigPin, OUTPUT);

  pinMode(echoPin, INPUT);

}

void loop() {

  // put your main code here, to run repeatedly: 

  digitalWrite(trigPin,LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin,HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin,LOW); 

  duration=pulseIn(echoPin, HIGH);

  distance=duration*0.034/2;

  Serial.print("Distance:  ");

  Serial.println(distance);

}