import processing.serial.*; 
 
String buff = ""; 
int val = 0; 
int NEWLINE = 10; 
 
Serial port; 
 
void setup() 
{ 
  size(200, 200); 
 
  // Print a list in case COM1 doesn't work out 
  println("Available serial ports:"); 
  println(Serial.list()); 
 
  //port = new Serial(this, "COM1", 19200); 
  // Uses the first available port 
  port = new Serial(this, Serial.list()[0], 19200); 
} 
 
void draw() 
{ 
  while (port.available() > 0) { 
    serialEvent(port.read()); 
  } 
  background(val); 
} 
 
void serialEvent(int serial) 
{ 
  // If the variable "serial" is not equal to the value for 
  // a new line, add the value to the variable "buff". If the 
  // value "serial" is equal to the value for a new line, 
  //  save the value of the buffer into the variable "val". 
  if(serial != NEWLINE) { 
    buff += char(serial); 
  } else { 
    buff = buff.substring(0, buff.length()-1); 
    // Parse the String into an integer 
    val = Integer.parseInt(buff)/4; 
    println(val); 
    // Clear the value of "buff" 
    buff = ""; 
  } 
} 
 
 
// / / / / / / / / / / / / / / / / / / / 
 
// Code for the BX-24 Microcontroller 
 
/* 
Sub main() 
  call delay(0.5)  ' start with half-second delay 
  do 
    ' returns values between 0 and 1023 
    ' the variable resistor is in pin 18 
    debug.print cstr(getADC(18)) 
    call delay(0.1)  ' one-tenth second delay 
  loop 
end sub 
*/