createCanvas(400, 400);

}

​

function draw() {

  background(225);

​

  // brightness based on cursor's x position

  let brightness = map(mouseX, 0, width, 0, 255);

  brightness = constrain(brightness, 0, 255); // Ensure brightness stays within range

​

  // Send brightness value to Arduino if serial is active

  if (serialActive) {

    writeSerial(`${brightness}\n`); 

  }

}

​

function keyPressed(){

   if (key == " ") { //set up serial

     setUpSerial();

   } 

}

​

function readSerial(value) {

  potValue = int(value); // Parse the potentiometer value

}

​