#define echoPin 6
#define trigPin 7

long duration;
int distance;

void setup()
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}
void loop()
{
  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.print(distance);
  Serial.println("cm");
}