/*Serial string reader
 Reads a string of characters from a serial port
 Converts the strings into ints and prints
 */

import processing.serial.*; //import processing library

int linefeed = 10;
Serial myPort; //the serial port

int pot0; //variable for potentiometer position
int pot1; //variable for potentiometer position
int pot2; //variable for potentiometer position

void setup() {
  size(400, 400);
  
  //list all available serial ports
  println(Serial.list());

  //plug in the serial port number that is attached to Arduino, should be 0 on Mac
  myPort = new Serial(this, Serial.list()[0], 9600);

  //read bytes into a buffer until linefeed (ASCII 10)
  myPort.bufferUntil(linefeed);
  
  //initialize sensor value
  pot0 = 0;
  pot1 = 0;
  pot2 = 0;
}

void draw() {
  background(0);
  noStroke();
  fill(255,0,0);
  rect(50, 10, 20, pot0);
  fill(0,255,0);
  rect(150, 10, 20, pot1);
  fill(0,0,255);
  rect(250, 10, 20, pot2);
}

void serialEvent(Serial myPort) {
  //read serial buffer
  String myString = myPort.readStringUntil(linefeed);

  //if you have any bytes other than linefeed
  if (myString != null) {
    myString = trim(myString);

    //convert sensor values into integers
    int sensors[] = int(split(myString, ','));
    //print out the values from the variable sensor
    for (int sensorNum = 0; sensorNum < sensors.length; sensorNum++) {
      print("Sensor " + sensorNum + ": " + sensors[sensorNum] + "\t");
      pot0 = sensors[0];
      pot1 = sensors[1];
      pot2 = sensors[2];
    }
    //add a linefeed after all the sensor values are printed
    println();
  }
}