Unable to receive serial data from Arduino

Processing Electronics (Arduino, etc.)
3

i would avoid byte things at all,
stick with readable ASCII you can follow in arduino monitor ( terminal )
and easy debug in processing.
ARDUINO


// https://discourse.processing.org/t/unable-to-receive-serial-data-from-arduino/14100
// kll tested also with a arduino leonardo

//Arduino program::
//To send on the serial port a value defined by the
//cursor of a potentiometer

#define POT 0       //assigns input 0 to the potentiometer
int val = 0;        //val is the input variable

void setup() {
  Serial.begin(9600);//open the serial port and
  // set the speed at 9600 bit/sec
}

void loop() {
  val = analogRead(POT);//read the voltage on pin A0 and name it val
//  Serial.print(val);//transmit val to the serial port
  Serial.println(val);//transmit val to the serial port
//  delay (10); //wait 10mS ( 100 lines per sec ?)
  delay (100); //wait  ( 10 lines per sec  better start slow )
}

PROCESSING 3.5.3

import processing.serial.*;
Serial myPort;
String data, val="NaN";
int var;

void setup_serial() {                                 // USB arduino..
  printArray(Serial.list());
  String portName = Serial.list()[1];         // adjust you arduino USB port
  myPort = new Serial(this, portName, 9600);
  myPort.clear();
  myPort.bufferUntil('\n');
  println("try connect to "+portName);
}

void serialEvent(Serial p) {                          // handle serial data
  data = trim(p.readStringUntil('\n'));
  if (data != null) {
    val = data;
    var = int(val);
    println("val "+val+" var "+var);            // print every GOOD line and if it is understood 
  }
}

void setup() {
  size(640, 360);
  setup_serial();
}

void draw(){}
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