​

function setup() {

  createCanvas(400, 400);

  mic = new p5.AudioIn();

  mic.start();

  noStroke();

  fill(30);

}

​

function draw() {

  background(220);

  // get the loudness

    let level = mic.getLevel();

  //map the loudness from 0 - 1, to 5 - 200

  level = map(level, 0, 1, 5, 200);

  ellipse(200, 200, level);

}