​

function setup() {

  createCanvas(600, 400);

​

  // Create an Audio input

  mic = new p5.AudioIn();

​

  // start the Audio Input.

  // By default, it does not .connect() (to the computer speakers)

  mic.start();

}

​

function draw() {

  background(0);

​

  // 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);

  ellipse(width / 2, h - 25, 50, 50);

}

​