​

let avg_fast = 0.0;

let avg_slow = 0.0;

​

function setup(){

  createCanvas(400, 400);

  mic = new p5.AudioIn();

  mic.start();

}

​

function draw() {

  background(50);

  let level = mic.getLevel();

​

  // calculate an average of the level that is less "jumpy"

  avg_fast = avg_fast * 0.90 + level * 0.10;

  // and one that is even less jumpy

  avg_slow = avg_slow * 0.99 + level * 0.01;

  noStroke();

  fill(150, 0, 255);

​

  ellipse(width * 0.25, height/2, map(level, 0.0, 1.0, 0, 1000));

  ellipse(width * 0.50, height/2, map(avg_fast, 0.0, 1.0, 0, 1000));

  ellipse(width * 0.75, height/2, map(avg_slow, 0.0, 1.0, 0, 1000)); 

​

  fill(255);

  text("Click to start the microphone!", 10, 20);

  text("Volume: " + level, 10, 50);

}