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serial read() help! (Read 1766 times)
antima55
serial read() help!
Mar 4th, 2010, 5:12am  
i have made the following arduino sketch:
Code:
#include <CapSense.h>

/*
 * CapitiveSense Library Demo Sketch
 * Paul Badger 2008
 * Uses a high value resistor e.g. 10M between send pin and receive pin
 * Resistor effects sensitivity, experiment with values, 50K - 50M. Larger resistor values yield larger sensor values.
 * Receive pin is the sensor pin - try different amounts of foil/metal on this pin
 * Best results are obtained if sensor foil and wire is covered with an insulator such as paper or plastic sheet
 */


CapSense   cs_4_2 = CapSense(4,2);	  // 10M resistor between pins 4 & 2, pin 2 is sensor pin, add wire, foil
void setup()			  
{

   cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
   Serial.begin(9600);

}

void loop()			  
{
    long theremin =  cs_4_2.capSense(30);
		   // tab character for debug windown spacing
	    int test=666;
    Serial.print(theremin);   
    Serial.print("\t"); 
 Serial.print(test);   
//Serial.print("\r"); 
Serial.print("\n");  // print sensor output 1

	delay(10);				     // arbitrary delay to limit data to serial port 
}


it takes capacitive input using capsense library and prints serial back to processing in the format:

capsense \t otherdata \n

the tabs are used to identify new data in processing and newline is used to difer when a pile of data is read.

my question is how do i write a processing sketch that catches these two pieces of data and stores them in two variables.
i have searched and troubleshooted and tried my way forth and havent figured anything out yet.

thx! Cheesy
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antima55
Re: serial read() help!
Reply #1 - Mar 4th, 2010, 5:23am  
ive figured something out. now i can read only the first bunch of data:
Code:

import processing.serial.*;

Serial port;
String buff1 = "";
String buff2 = "";
int NEWLINE = 10;
int oldval=0;
int farve=255;
int mode=0;
int val=0;
// Store the last 64 values received so we can graph them.
int[] values = new int[64];

void setup()
{
  size(512, 512);
  strokeWeight(3);
  
  println("Available serial ports:");
  println(Serial.list());
  
  // Uses the first port in this list (number 0).  Change this to
  // select the port corresponding to your Arduino board.  The last
  // parameter (e.g. 9600) is the speed of the communication.  It
  // has to correspond to the value passed to Serial.begin() in your
  // Arduino sketch.
  port = new Serial(this, Serial.list()[1], 9600);  
  
  // If you know the name of the port used by the Arduino board, you
  // can specify it directly like this.
  //port = new Serial(this, "COM1", 9600);
}

void draw()
{
  background(53);
  stroke(farve);
  
  // Graph the stored values by drawing a lines between them.
  for (int i = 0; i < 63; i++)
    line(i * 8, height - values[i]/100, (i + 1) * 8, height - values[i +1]/100);
    
  while (port.available() > 0)
    serialEvent(port.read());
    println(oldval);
   int oldval2=constrain(oldval,0,500);
   farve=(int)map(oldval2, 0,500,0,255);
}

void serialEvent(int serial)
{
  //
  if (serial != NEWLINE) {
    
    if(serial!= TAB){

	buff1 += char(serial);
    }
    
    
    // Store all the characters on the line.
    
  } else {
    
    // The end of each line is marked by two characters, a carriage
    // return and a newline.  We're here because we've gotten a newline,
    // but we still need to strip off the carriage return.
    buff1 = buff1.substring(0, buff1.length()-1);
    
    // Parse the String into an integer.  We divide by 4 because
    // analog inputs go from 0 to 1023 while colors in Processing
    // only go from 0 to 255.

     val = (Integer.parseInt(buff1)/10+oldval)/2;

    
    //println("test");
    // Clear the value of "buff"
    buff1 = "";
    
    // Shift over the existing values to make room for the new one.
    for (int i = 0; i < 63; i++)
	values[i] = values[i + 1];
    
    // Add the received value to the array.
    values[63] = val;
    oldval=val;
    
    
    mode=0;
    
  }
}
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