let mic;

let amp;

let scale = 1.0;

​

​

function setup() {

createCanvas(440, 440);

background(0);

// Create an audio input and start it

  mic = new p5.AudioIn();

  mic.start();

// Create a new amplitude analyzer and patch into input

amp = new p5.Amplitude();

amp.setInput(mic);

}

​

function draw() {

// Draw a background that fades to black

noStroke();

fill(0, 10);

rect(0, 0, width, height);

// The getLevel() method returns values between 0 and 1,

// so map() is used to convert the values to larger numbers

​

scale = map(amp.getLevel(), 0, 1.0, 10, width);

// Draw the circle based on the volume

fill(255);

ellipse(width/2, height/2, scale, scale);

}