ping))) Ultrasonic Sensor

const int pingPin = 7;

void setup(){

  Serial.begin(9600);

}

void loop(){

  long duration, inches, cm;

  pinMode(pingPin, OUTPUT);

  digitalWrite(pingPin, LOW);

  delayMicroseconds(2);

  digitalWrite(pingPin, HIGH);

  delayMicroseconds(5);

  digitalWrite(pingPin, LOW);

  pinMode(pingPin, INPUT);

  duration = pulseIn(pingPin, HIGH);

  inches = microsecondsToInches(duration);

  cm = microsecondsToCentimeters(duration);

  

  Serial.print(inches);

  Serial.print("in, ");

  Serial.print(cm);

  Serial.print("cm");

  Serial.println();

  

  delay(100);

}

long microsecondsToInches(long microseconds){

  return microseconds / 74 / 2;

}

long microsecondsToCentimeters(long microseconds){

  return microseconds / 29 / 2;

}

Supplier (Jameco)