Arduino to Processing with Serial

knobs_to_serial.ino

int knob_0_pin = A0;
int knob_1_pin = A1;
int knob_2_pin = A2;
int knob_3_pin = A3;
int knob_4_pin = A4;
int knob_5_pin = A5;

void setup() {
  Serial.begin(9600);
}

/*
prefer Serial.write to Serial.print for Processing
a small delay helps as well, too small works not
*/

void loop() {
  int knob_0 = analogRead(knob_0_pin);
  int knob_1 = analogRead(knob_1_pin);
  int knob_2 = analogRead(knob_2_pin);
  int knob_3 = analogRead(knob_3_pin);
  int knob_4 = analogRead(knob_4_pin);
  int knob_5 = analogRead(knob_5_pin);

  if (Serial) {
    Serial.print(knob_0);
    Serial.print(',');
    Serial.print(knob_1);
    Serial.print(',');
    Serial.print(knob_2);
    Serial.print(',');
    Serial.print(knob_3);
    Serial.print(',');
    Serial.print(knob_4);
    Serial.print(',');
    Serial.print(knob_5);
    Serial.println(' ');
  }
}

serial_to_processing.pde

/*
Sending anything other than structured bytes from Arduino to Processing, is a fucking nightmare.
read: https://www.arduino.cc/en/Tutorial/SerialCallResponse

IMPORTANT: First open Processing, then boot Arduino, or stream gets cut in the middle and causes errors.
*/

import processing.serial.*;

Serial port;
String input;
PFont mono;

void settings() {
  //fullScreen();
  size(640, 480);
}

void setup() {
  println(Serial.list());

  port = new Serial(this, Serial.list()[0], 9600);

  //prevent reading from middle of stream, or try to
  port.bufferUntil('\n');
  port.clear();
  input = port.readStringUntil('\n');
  input = null;
}

void draw() {
  if ( port.available() > 0) {

    input = port.readStringUntil('\n');
    if (input != null) {

      println(input); //DEBUG

      //split input to an array
      input = trim(input);

      String[] tokens = split(input, ',');

      //map input to your variables, may need a check for NULL
      float[] value = new float[6];
      value[0] = map(float(tokens[0]), 0, 1023, 1, 4381376);
      value[1] = map(float(tokens[1]), 0, 1023, 1, 10815);
      value[2] = map(float(tokens[2]), 0, 1023, -9290, 9290);
      value[3] = map(float(tokens[3]), 0, 1023, 0, 9290);
      value[4] = map(float(tokens[4]), 0, 1023, 32, 3817);
      value[5] = map(float(tokens[5]), 0, 1023, 1, 751);

      printArray(value);
    }
  }
}