Processing 1.0 - Processing Discourse - separate index from integer in String(serial port)

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Index › Programming Questions & Help › Electronics, Serial Library › separate index from integer in String(serial port)

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separate index from integer in String(serial port) (Read 1977 times)

CyberCulture.

separate index from integer in String(serial port)
Apr 5^th, 2010, 11:52am

Hello,

any hint how to separate the integer from the index at the result below

see here what I get from the serial port:

http://gyazo.com/345946cd2968f122af9f6a2cb2c6d4a6.png

and this is my code:

Code:

import processing.serial.*;
Serial port;
byte[] inbyte = new byte[4];
void setup()
{
  port = new Serial(this,Serial.list()[1], 9600);
 }

void draw()

{
     delay(300);  
	while(port.available()>0)
	{
  	  String r = port.readString();
	  println(r);
          delay(500);
          String g = port.readString();
	  println(g);
          delay(500);
          String b = port.readString();
	  println(b);
          delay(500); 
	}
}

« Last Edit: Apr 7^th, 2010, 1:42am by CyberCulture. »

NoahBuddy Ex Member	Re: separate index from integer in String Reply #1 - Apr 7^th, 2010, 1:04am Perhaps split() Then use int() on the results. http://processing.org/reference/split_.html

CyberCulture.

Re: separate index from integer in String
Reply #2 - Apr 7^th, 2010, 1:37am

Hello,

thanks a lot for the answer..I tried split but when I use split[0] I get a result of zeros..
when I use split[1] I get an error

ArrayIndexOutOfBoundsException: 1

see my code with "split" below..

Code:

import processing.serial.*;
Serial port;
byte[] inbyte = new byte[4];
void setup()
{
  port = new Serial(this,Serial.list()[1], 9600);
 }

void draw()

{
     delay(300);  
	while(port.available()>0)
	{
  	  String r = port.readString();
  
	  String[] list = split(r, ',');
            int str2int = int(list[0]);

            println(str2int);
	}
}

CyberCulture.

Re: separate index from integer in String(serial port)
Reply #3 - Apr 7^th, 2010, 2:25am

thanks again for the hint - the code works with splitTokens! The only thing is that the delay that I have in my code..works strangely..when I change the delay time my output changes and sometimes if the delay is not long enough I get an error..
If I change the delay time for 100ms I get different output and I have a long array to read so I want to be sure I get the correct data...
It seems though comparing the output with arduino's serial monitor that it works well with a delay of 600.
any hint how I can figure out a "correct" delay time or why is this happening?any hint to improve this code below?

Code:

import processing.serial.*;
Serial port;
byte[] inbyte = new byte[4];
void setup()
{
  port = new Serial(this,Serial.list()[1], 9600);
 }

void draw()

{
    
	while(port.available()>0)
	{
  	  String r = port.readString();
  
	  String[] list = splitTokens(r);
          int str2int = int(list[1]);
          println(str2int);
          delay(600);  
	}
}

NoahBuddy

Re: separate index from integer in String(serial port)
Reply #4 - Apr 10^th, 2010, 3:02am

Since draw() can (in theory) run at any time, the delay simply makes sure that you have given enough time to receive the entire message.

You could use http://processing.org/reference/libraries/serial/Serial_readChar_.html to build up a string and watch for a specific character, say an end of line (or just add a * or something). That way your sketch will know exactly when to split the message.

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