//Feel free to use this code.
//Please be respectful by acknowledging the author in the code if you use or modify it.
//Author: Bruce Allen
//Date: 23/07/09

//Digital pin 7 for reading in the pulse width from the MaxSonar device.
//This variable is a constant because the pin will not change throughout execution of this code.
const int pwPin = 7;
//variables needed to store values
long pulse, inches, cm;
void setup() {
//This opens up a serial connection to shoot the results back to the PC console
 Serial.begin(9600);

}
void loop() {
pinMode(pwPin, INPUT);

  //Used to read in the pulse that is being sent by the MaxSonar device.
//Pulse Width representation with a scale factor of 147 uS per Inch.

pulse = pulseIn(pwPin, HIGH);
 //147uS per inch
 inches = pulse/147;
 //change inches to centimetres
 cm = inches * 2.54;

Serial.print(inches);
 Serial.print("in, ");
 Serial.print(cm);
 Serial.print("cm");
 Serial.println();

delay(500);

}