Save Data from Arduino to .txt with Processing

Processing Electronics (Arduino, etc.)
8

I threw together some code to send data from Arduino to Processing.
On the Processing side I converted the incoming String data to data type (String, int or float) and stored in array.
It may help as an example.

Arduino:

void setup() 
  {
  // initialize the serial communication:
  Serial.begin(9600);
  prevTime = millis();
  }

void loop() 
  {

> Blockquote

currTime = millis();
  diffTime = currTime - prevTime;
  prevTime = currTime; 
  // send the value of analog input 0:
  Serial.print(count++); Serial.print(' ');
  Serial.print(millis()); Serial.print(' ');
  Serial.print(diffTime); Serial.print(' ');
  Serial.print(random(0, 255));
  Serial.println();
  delay(1);
  }

Processing:

import processing.serial.*;

Serial myPort;
String vals;
String[] splitvals;
String[] d0 = new String[1000];
int[] d1 = new int[1000];
int[] d2 = new int[1000];
float[] d3 = new float[1000];
int i = 0;

void setup()
  {
// List all the available serial ports:
  printArray(Serial.list()); 
    
  String portName = Serial.list()[2];
  myPort = new Serial(this, portName, 9600);
  myPort.clear();
  delay(100);
  myPort.clear();
  }

void draw()
  {
  if (myPort.available() > 0)
    {
    vals = myPort.readStringUntil('\n');
    println(vals);
    }
   
//  vals = ("one two three four");
  
  if (vals != null && true)   // Check for null and other condition "true"
    {
    splitvals = split(vals, ' '); 
    saveStrings("meineDatei.txt", splitvals);
    
    printArray(splitvals);
    
    d0[i] = splitvals[0];
    d1[i] = int(splitvals[1]);
    d2[i] = int (splitvals[2]);
    d3[i] = float(splitvals[3]);
    
    println(d0[i], d1[i], d2[i], d3[i]);
    println("-----------------------------------------");
    
    i++;
    }
  }

Output:
0] "COM4"
[1] "COM5"
[2] "COM6"
[3] "COM10"
[4] "COM11"
0 0 0 232

[0] "0"
[1] "0"
[2] "0"
[3] "232
"
0 0 0 232.0
-----------------------------------------
1 1 1 19

[0] "1"
[1] "1"
[2] "1"
[3] "19
"
1 1 1 19.0
-----------------------------------------
2 2 1 158

[0] "2"
[1] "2"
[2] "1"
[3] "158
"
2 2 1 158.0
-----------------------------------------

Output can be cleaned up (That quote did not belong there all alone like that!) by adding:
vals = trim(vals);
I will leave it as an exercise to put in the correct place in your code.

It will likely crash when i goes over 999!

Update:
It WILL crash when i goes over 999! Just tried it…

1000 17382 20 81
[0] "1000"
[1] "17382"
[2] "20"
[3] "81"

ArrayIndexOutOfBoundsException: 1000

:slight_smile: