Arduino random tone player

melody.c

#include "Arduino.h"
#include "tones.h"

const int LED_PIN = 13;
const int BUTTON_PIN = 2;
const int PIEZO_PIN = 8;

int current_tone;
boolean playing = false;

void setup() {
  randomSeed(analogRead(0));

  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);

  // turn off the inbuilt LED
  digitalWrite(LED_PIN, LOW);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}


void loop() {
  // put your main code here, to run repeatedly:
  if (digitalRead(BUTTON_PIN) == LOW) {
    playing = true;
    digitalWrite(LED_PIN, HIGH);
    tone(PIEZO_PIN, NOTES[current_tone], 100);
  }
  if (playing && digitalRead(BUTTON_PIN) == HIGH) {
    // If we were playing, and button pressed, turn off
    digitalWrite(LED_PIN, LOW);
    noTone(PIEZO_PIN);

    // pick a new tone for next time
    current_tone = random(0, NOTES_LEN - 1);
    playing = false;
  }
}