SEN136B5B

const int pinTOping = 7;
void setup() {
 
  Serial.begin(9600); //Serial communication at 9600 bps rate
  Serial.println("Test for the Ultrasonic range sensor");
}
void loop() 
{
  // initialzing the variables using long data type
  long TIMEduration, in, cm;
  // The PING))) is triggered by a HIGH pulse valu2 of 2 or more microseconds.
  // We have specified short time to clean HIGH pulse:
  pinMode(pinTOping, OUTPUT);
  digitalWrite(pinTOping, LOW);
  delayMicroseconds(4);
  digitalWrite(pinTOping, HIGH);
  delayMicroseconds(8);
  digitalWrite(pinTOping, LOW);
  // We have used the same pin to read the signal from the PING)), which is a HIGH pulse
  // the time is measured in microseconds
  pinMode(pinTOping, INPUT);
  TIMEduration = pulseIn(pinTOping, HIGH);
  // convert the time into a distance
  in = microsecondsToIn(TIMEduration);
  cm = microsecondsToCm(TIMEduration);
  Serial.print(in);
  Serial.print("inches, ");
  Serial.print(cm);
  Serial.print("centimeters");
  Serial.println();
  delay(200); //time delay of 200 microseconds
}
long microsecondsToIn(long microseconds) {
  //  there are 73.746 microseconds per inch according to PING datasheet 
  // we need to divide the distance by 2
  //It is because the ping travels forward and bounces backward
  return microseconds / 74 / 2;
}
long microsecondsToCm(long microseconds) {
  // The speed of sound is 340 m/s 
  return microseconds / 29 / 2;
}