Data Logging from Multiple Boards to HDD

i trying store sensor data multiple arduino bords 1 text file processing programming language v2.1.1.

1. can read , store data text file arduino board program shown below. works fine.

2. wanted read data multiple boards , record in 1 text file. saved program different name , made chnages. stopped working. compared line line working program , deleted chages, still did not work.

3. surprised see insignificant change makes program unworkable. if comment-out line, program not work more. explained below.


to_txt_no_dgtl.pde
====================================

/*

***  warning: file today's date overritten ****

       * receive multiple fields binary file_p
       *
       * portindex must set port connected arduino
       * based on receivemultiplefieldsbinary, version saves data file
       * press key stop logging , save file
       */

import processing.serial.*;

printwriter output;
string filenm;
string prtnm;
serial myprt, myprt1;                                // create object serial class
short prtindx = 2;                          // select com port, 0 first port
char header = 'h';
int ttlprt = 0;
int strtng, dy = 0;
int val;
string y, m, d;
string hr;
string mn;
string s;
string t;

void setup()
{
  size(200, 200);
  dy = day();
  ttlprt = serial.list().length;                    // counts how many com ports present
   
  if (ttlprt <=2)                                   // i.e. arduino connected or not
  {
    println("only " + ttlprt + " com ports present.");
    println("may be, arduino not connected.");
  }
  else
  {
                                                              // open whatever serial port connected arduino.
    string prtnm = serial.list()[prtindx];
    println(serial.list());
    println(" connecting -> " + serial.list()[prtindx]);
    myprt1 = new serial(this, prtnm, 9600);
  }
}

void draw()
{
  if (ttlprt <=2)
    exit();
  else
  {                                         // after running, first time file created
    if (strtng == 0 || dy != day())
    {
      y = str(year());
      m = str(month());
      d = str(day());
      if (month() < 10)
        m = "0" + m;
      if (day() < 10)
        d = "0" + d;
   
      if (dy != day())        // when continuosly running, if date changes existing file closed , new file created
      {
        output.flush();                       // writes remaining data file
        output.close();                       // closes file
      }
      filenm = (y + m + d);
      output = createwriter(filenm + ".txt");
      output.println("  , " + "  , " + "   , " + "room,   " + " roof,  " + "s.wall, " + "s.wall, " + "  roof, " + "e.wall  ");
      output.println("hr, " + "mn, " + "sec, " + "centre, " + " under, " + "inside, " + "otside, " + "  top,  " + "outside " + "\n");
      strtng = 1;
      dy = day();
    }
 
    hr = str(hour());
    mn = str(minute());
    s = str(second());
    if (hour() < 10)
      hr = "0" + hr;
    if (minute() < 10)
      mn = "0" + mn;
    if (second() < 10)
    s = "0" + s;
 
    if ( myprt1.available() >= 15)                      // wait entire message arrive
    {
      if( myprt1.read() == header)       // header
      {
            // header found
        println(hr + "  " + mn + "  " + s + "     ");
        output.print(hr + ", " + mn + ",  " + s + ", ");

// --------- print 6 analog port values ---------

        for(int i=0; < 6; ++)
        {
          val = 0;
          val = readarduinoint1();
          println("analog port " + + "= " + val);
        if (val <= 9)
          output.print("     " + val + ", ");
        if (val > 9 && val < 100)
          output.print("    " + val + ", ");
        if (val > 99 && val < 1000)
          output.print("   " + val + ", ");
        if (val > 999 && val < 10000)
          output.print("  " + val + ", ");
        if (val > 9999 && val < 100000)
          output.print(" " + val + ", ");
        }
        println("----");
        output.println("\n");
      }
    }
    k = k+1;
    if (k > 10)
    {
      k=0;
      output.flush();                     // writes remaining data file
    }
  }
}
void keypressed()
{
  output.flush();                       // writes remaining data file
  output.close();                       // finishes file
  exit();                               // stops program
}

// ------- function value reading com2 ----------

                                        // return integer value bytes received on serial port
                                        // (in low,high order)
int readarduinoint1()
{
  int val;                              // data received serial port
  val = myprt1.read();                  // read least significant byte
  val =  myprt1.read() * 256 + val;           // add significant byte
  return val;
}
                                        // (in low,high order)
                                       
========================================


4. "if-then" loop line 101 130 works fine.

5. but, if add "else" loop working loop stops working shown below:


++++++++++++++++++++++++++++++++++++++++

    if ( myprt1.available() >= 15)
    {
      working codes
    }
    else
    {
      println("port not available");
    }
++++++++++++++++++++++++++++++++++++++++

note: curly brackets not necessary, 1 line after "else".

the idea of program adopted arduino cookbook michael margolis.

quote

i trying store sensor data multiple arduino bords 1 text file processing programming language v2.1.1.

how have multiple boards connected 1 serial port on pc?

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