Is there a way to directly control a Ping sensor connected to an arduino from processing?
I was having a delay and poor response from using serial. I figured I'd give firmata a try, but I cannot seem to do the pulseIn function from arduino in processing.
I am also wondering about the microseconds parts.
Is this possible?
The reason id like to this is I want to save serial chatter for sending information to pd, or would it be easier / is it possible to send information to both pd and processing using the same serial port?
I need information from arduino to processing, and from processing to pd, I do not need cross talk between arduino and pd.
Thanks,
Here is the code:
import processing.serial.*;
import cc.arduino.*;
Arduino arduino;
int pingPin = 7;
void setup() {
//println(Arduino.list());
size(470, 280);
arduino = new Arduino(this, Arduino.list()[0], 57600);
}
void draw() {
/* 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 7
http://www.arduino.cc/en/Tutorial/Ping
created 3 Nov 2008
by David A. Mellis
modified 30 Jun 2009
by Tom Igoe
This example code is in the public domain.
*/
// 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:
arduino.pinMode(pingPin, Arduino.OUTPUT);
arduino.digitalWrite(pingPin, Arduino.LOW);
delay(2);
arduino.digitalWrite(pingPin, Arduino.HIGH);
delay(5);
arduino.digitalWrite(pingPin, Arduino.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.
arduino.pinMode(pingPin, Arduino.INPUT);
duration = arduino.pulseIn(pingPin, Arduino.HIGH);
// convert the time into a distance
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
System.println(inches);
//Serial.print("in, ");
//Serial.print(cm);
//Serial.print("cm");
//Serial.println();
delay(200);
}
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;
}