let xValue = 0;  

​

function setup() {

  createCanvas(700, 700);

}

​

function draw() {

  background(220);

  if (!serialActive) {

    text("Press Space Bar to select Serial Port", 20, 30);

  } 

  else {

    text("Connected", 20, 30);

    ellipse(xValue, height/2, 150, 150);

  }

}

​

//Sets up the serial connection

function keyPressed() {

  if (key == " ") {

    setUpSerial();

  }

}

​

//Functino to read in serial data from the Serial Port. 

function readSerial(data) {

  if (data != null) {

    //Mapping the sensor values from 'data' - 0 to 500 - 0

    xValue = map(data, 0, 1023, 0, width);

  }

}

​

​