​

function setup() {

  createCanvas(400, 400);

  mic = new p5.AudioIn();

  mic.start();

}

​

function draw() {

  background(220);

  let level = mic.getLevel();

  if (level > 0.1) {

    background(random(255), random(255), random(255));

  }

  ellipse(width/2, height/2, level * 1000, level * 1000);

  // console.log(level);

}

​