Processing RGB LED Matrix Visualizer (for Raspberry Pi)

32_x_128_audio_visualizer.java

import ddf.minim.*;

Minim minim;
AudioInput mic;
int rows = 128;
int cols = 64;
float scale = 4.5; // Scale factor for the size of the circles
float noiseScale = 0.012; // Scale factor for the Perlin noise
float micThreshold = -10;
float t = 0; // Noise offset
float noiseThreshold = 0.4;

void setup() {
  size(400, 800); // Height is double the width
  colorMode(HSB, 360, 100, 100);
  noStroke();

  // Initialize the microphone
  minim = new Minim(this);
  mic = minim.getLineIn();
}

void draw() {
  background(0);

  // Get the volume from the microphone
  float vol = mic.mix.level();

  if (vol < micThreshold) return;

  // Map the volume to a larger range to make the effect more noticeable
  float noiseSpeed = map(vol, 0, 1, 0, 50);

  for (int y = 0; y < rows; y++) {
    for (int x = 0; x < cols; x++) {
      // Calculate the position for each circle
      float xPos = map(x, 0, cols, 0, width);
      float yPos = map(y, 0, rows, 0, height);

      // Use Perlin noise to determine the color
      float n = noise(x * noiseScale, y * noiseScale, t);

      float hue = map(n, 0, 1, 0, 360);
      if (n > noiseThreshold) {
        fill(hue, 100, 100);

        ellipse(xPos, yPos, scale, scale);
      }
    }
  }

  // Increment t based on the volume
  t += noiseSpeed;
}