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import processing.serial.*;
Serial myPort;

void setup()
{
  size(500, 500);

  // print all available ports
  println(Serial.list());

  // open specific serial port
  myPort = new Serial(this, "/dev/cu.usbmodem14621", 9600);
}

void draw()
{
  // prepare values
  int firstValue = 111;
  int secondValue = 222;
  int thirdValue = 333;

  // write values
  myPort.write(str(firstValue));
  myPort.write(",");
  myPort.write(str(secondValue));
  myPort.write(",");
  myPort.write(str(thirdValue));
  myPort.write("\n");
}

#define NUM_VALUES 3

int incomingValues[NUM_VALUES];

void setup()
{
  pinMode(LED_PIN, OUTPUT);

  // open the serial port with a baudrate of 9600
  Serial.begin(9600);
}

void loop()
{
  // check if data is available
  if (Serial.available() > 0)
  {
    // read string
    String str = Serial.readStringUntil('\n');

    // split data and write to incomingValues
    split(str, incomingValues, NUM_VALUES);
  }

  // take first value and set LED
  analogWrite(6, incomingValues[0]);
}

void split(String inputString, int returnData[], int numOfValues)
{
  int index = 0;
  int lastPos = 0;

  for (int i = 0; i < inputString.length(); i++)
  {
    if (inputString.charAt(i) == ',' && index < numOfValues)
    {
      String tempStr = inputString.substring(lastPos, i - 1);
      returnData[index] = tempStr.toInt();
      index++;
      lastPos = i + 1;
    }
  }
}