import processing.sound.*;
import processing.serial.*;


FFT fft;
AudioIn in;
int bands = 4;
float[] spectrum = new float[bands];

Serial arduino;

void setup() {
  size(600, 300);
  background(255);
  
  frameRate(14);
  // Create an Input stream which is routed into the Amplitude analyzer
  fft = new FFT(this, bands);
  in = new AudioIn(this, 0);

  // start the Audio Input
  in.start();

  // patch the AudioIn
  fft.input(in);

  String portName = Serial.list()[0]; //change the 0 to a 1 or 2 etc. to match your port
  arduino = new Serial(this, portName, 9600);
}

void draw() {
  background(255);
  fft.analyze(spectrum);

  for (int i = 0; i < bands; i++) {
    // The result of the FFT is normalized
    // draw the line for frequency band i scaling it up by 5 to get more amplitude.
    if (i == 0) {
      fill(255, 0, 0);
      int val = (int)map(spectrum[i], 0, 1, 0, 255);
      arduino.write("1c" + val + "w");
    } else if (i == 1) {
      int val = (int)map(spectrum[i], 0, 1, 0, 255);
      fill(0, 255, 0);
      arduino.write("5c" + val*2 + "w");
    } else if (i == 2) {
      int val = (int)map(spectrum[i], 0, 1, 0, 255);
      fill(0, 0, 255);
      arduino.write("9c" + val*3 + "w");
    }
    rect(i * 200, 0, 200, spectrum[i] * height);
  }
}