​

function setup() {

  createCanvas(400, 400);

  mic = new p5.AudioIn();

  mic.start();

}

​

function draw() {

  background(220, 220, 220, 10);

  //background(220);

  let micLevel = mic.getLevel(); // between 0 - 1

  noStroke();

  let diameter = map(micLevel, 0, 1, 5, 1000);

  circle(width / 2, height / 2, diameter);

}