arduinoDue + sensors(ping)-first-steps

hi, i have a arduino due with ide-1.5.2 under win7 and ubuntu 10.10 install and run "hello world" OK this are my first steps in the arduinoDue-world:

now my problem: i want read the output of the parallax-ping my code: sketch_ping1 / sketch_pings: the original code is eventually for uno or something i change the pingPin from 7 to 22 (on duo this are the digital pins) upload ok running ok but no correct output == 0 in, 0cm i have testet the ping-device with the parallax-propeller-C3-board and its ok sketch_ping1

/* Ping))) Sensor

   This sketch reads a PING))) ultrasonic rangefinder and returns the
   distance to the closest object in range. To do this, it sends a pulse
   to the sensor to initiate a reading, then listens for a pulse
   to return.  The length of the returning pulse is proportional to
   the distance of the object from the sensor.
   The circuit:
    * +V connection of the PING))) attached to +5V
    * GND connection of the PING))) attached to ground
    * SIG connection of the PING))) attached to digital pin 22
   created 3 Nov 2008
   by David A. Mellis
   modified 30 Aug 2011
   by Tom Igoe

   This example code is in the public domain.


// this constant won't change.  It's the pin number
// of the sensor's output:
const int pingPin = 22; // 7

void setup() {
  // initialize serial communication:

void loop()
  // establish variables for duration of the ping,
  // and the distance result in inches and centimeters:
  long duration, inches, cm;

  // The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  digitalWrite(pingPin, HIGH);
  digitalWrite(pingPin, LOW);

  // The same pin is used to read the signal from the PING))): a HIGH
  // pulse whose duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  pinMode(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);

  // convert the time into a distance
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);

  Serial.print("in, ");


long microsecondsToInches(long microseconds)
  // According to Parallax's datasheet for the PING))), there are
  // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
  // second).  This gives the distance travelled by the ping, outbound
  // and return, so we divide by 2 to get the distance of the obstacle.
  // See:
  return microseconds / 74 / 2;

long microsecondsToCentimeters(long microseconds)
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;


const int signal=22;
int distance;
unsigned long pulseduration=0;

void setup()
 pinMode(signal, OUTPUT);

void measureDistance()
 // set pin as output so we can send a pulse
 pinMode(signal, OUTPUT);

// set output to LOW
 digitalWrite(signal, LOW);

 // now send the 5uS pulse out to activate Ping)))
 digitalWrite(signal, HIGH);
 digitalWrite(signal, LOW);

 // now we need to change the digital pin
 // to input to read the incoming pulse
 pinMode(signal, INPUT);

 // finally, measure the length of the incoming pulse
 pulseduration=pulseIn(signal, HIGH);

void loop()
 // get the raw measurement data from Ping)))

 // divide the pulse length by half

 // now convert to centimetres. We're metric here people...
 distance = int(pulseduration/29);

 // Display on serial monitor
 Serial.print("Distance - ");
 Serial.println(" cm");

this is my first step with the arduino due-board. and somethings going wrong and i have no idea whats going on. excuse my cross-posting (sensors and Deutsch) thanks for help , hints and tricks. excuse my bad english regards nomad

You might read and add the timeout variable to see if the sensor times out (or not).

hi TheKitty, thanks for your answer i make some tests regards nomad