let analyzer;

​

function setup() {

  createCanvas(400, 400);

  mic = new P5.AudioIn();

  mic.start();

}

​

function draw() {

  background(220);

  arc(100,100,90,90, PI, 2*PI);

    // Get the overall volume (between 0 and 1.0)

  let vol = mic.getLevel();

  fill(255);

  stroke(0);

​

  // Draw an ellipse with height based on volume

  let h = map(vol, 0, 1, height, 0);

  let h = vol * 100;

  ellipse(330, 75, h, h);

}