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
http://www.arduino.cc/en/Tutorial/Ping
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:
Serial.begin(9600);
}
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);
//delayMicroseconds(2);
digitalWrite(pingPin, HIGH);
//delayMicroseconds(5);
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(inches);
Serial.print("in, ");
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(100);
}
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: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
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;
}
sketch_ping2
const int signal=22;
int distance;
unsigned long pulseduration=0;
void setup()
{
pinMode(signal, OUTPUT);
Serial.begin(9600);
}
void measureDistance()
{
// set pin as output so we can send a pulse
pinMode(signal, OUTPUT);
// set output to LOW
digitalWrite(signal, LOW);
delayMicroseconds(5);
// now send the 5uS pulse out to activate Ping)))
digitalWrite(signal, HIGH);
delayMicroseconds(5);
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)))
measureDistance();
// divide the pulse length by half
pulseduration=pulseduration/2;
// now convert to centimetres. We're metric here people...
distance = int(pulseduration/29);
// Display on serial monitor
Serial.print("Distance - ");
Serial.print(distance);
Serial.println(" cm");
delay(500);
}
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