const h = 512;

let fft, mic;

​

function setup() {

  createCanvas(w, h);

  pixelDensity(1);

​

  // Initialize microphone

  mic = new p5.AudioIn();

  mic.start();

​

  // Initialize FFT (Fast Fourier Transform) for audio analysis

  fft = new p5.FFT();

  fft.setInput(mic);

}

​

function draw() {

  background(255);

​

  // Microphone stuff

  let spectrum = fft.analyze();

  strokeWeight(3);

  beginShape();

  for (let i = 0; i < spectrum.length; i++) {

    let f = constrain(spectrum[i], 0, 255);

    stroke(255 - f, f, 0);

    let x = map(i, 0, spectrum.length, 0, width);

    let y = map(f, 0, 255, height>>1, 0);

    point(x, y);

  }

  endShape();

}

​