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let xVal = 0; //initializing the X value for the position function setup() { createCanvas(640, 480);}function draw() { background(230); if (!serialActive) { text("Press Space Bar to select Serial Port", 20, 30); } else { // draw an ellipse ellipse(xVal, height/2, 100, 50); //giving the ellipse the value of the x position initialized above }}function keyPressed() { if (key == " ") { // important to have in order to start the serial connection!! setUpSerial(); }}function readSerial(data) { if (data != null) { xVal = map(data, 0, 500, 0, width); //mapping the values received from the photosensor to control the X position of the ellipse console.log(data); }}