Ultrasonic Distance Sensor

const int trigPin=4;
const int echoPin=6;
long duration;
int distance;

void setup() {
  // put your setup code here, to run once:
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(2,OUTPUT);
  Serial.begin(9600);  

}

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);
}