What I try to do is read from two sensors: light and slider
after received at the serial port into reading from light sensor (valP_light) and reading from slider sensor (valP_slider)
But why is this not working?


import processing.serial.*;
Serial port; // Create object from Serial class

int valP_slider; // Data received from the serial port - variable to store the slider sensor reading
int valP_light; // Data received from the serial port - variable to store the light sensor reading
PImage image_a, image_b;

byte[] inBuffer = new byte[2046]; //size of the serial buffer to allow for end of data characters and all chars (see arduino code)


void setup() {
size(800, 600); //size of window
noStroke();
frameRate(60); // Run 60 frames per second


// Open the port that the board is connected to and use the same speed (9600 bps)
port = new Serial(this, "COM5", 9600);
}
void draw() {
if (0 < port.available()) { // If data is available to read,

   port.readBytesUntil('&', inBuffer);  //read in all data until '&' is encountered
   if (inBuffer != null) {
     String myString = new String(inBuffer);
     
     String[] p = splitTokens(myString, "&");  //p is all sensor data (with a's and b's) ('&' is eliminated)
     
           
     String[] slider_sensor = splitTokens(p[0], "b");  //get slider sensor reading
       valP_slider= int(slider_sensor[1]);
   
   print(valP_slider);
   println(" ");  
   
  String[] light_sensor=splitTokens(p[0], "a");  //get light sensor reading
      valP_light= int (light_sensor[1]);
   
   print(valP_light);
   println(" ");
   
image_a = loadImage("Background.jpg");
tint(255,255,valP_light);
image(image_a, 0, 0);

}
}
}