Ping.ino

/*
 * Codeing By IOXhop : www.ioxhop.com
 */

#define Trig_PIN 12 // Pin connect to Trig pin
#define Echo_PIN 13 // Pin connect to Echo pin

void setup() {
  pinMode(Trig_PIN, OUTPUT);
  pinMode(Echo_PIN, INPUT);

  Serial.begin(9600);
}

void loop() {
  digitalWrite(Trig_PIN, LOW);
  delayMicroseconds(5);
  digitalWrite(Trig_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(Trig_PIN, LOW);
  unsigned int PulseWidth = pulseIn(Echo_PIN, HIGH);
  unsigned int distance = PulseWidth * ???;

  Serial.print("Distance is ");
  Serial.print(distance);
  Serial.println(" cm.");
  delay(100);
}