// https://en.wikipedia.org/wiki/Pitch_(music)
// https://en.wikipedia.org/wiki/Piano_key_frequencies
// https://gist.github.com/mikeputnam/2820675 // pitches.h

#include <FastLED.h> // https://github.com/FastLED/FastLED

int hours = 3; // hours for pre-delay

#define PIN   4 // PWM for WS2812B DIN
#define LED   1 // WS2812B count
#define MAX 255 // Maximum brightness
#define MIN   0 // Minimum brightness

#define SPK   0 // speaker
#define LO  110 // lowest frequency
#define HI 1760 // highest frequency

CRGB leds[LED];

void setup() {
  FastLED.addLeds<WS2812, PIN, GRB>(leds, LED);
  FastLED.clear();
  FastLED.setBrightness(255);
  FastLED.show();
  pinMode(SPK, OUTPUT);

  // predelay(hours); // (hours) delay before light and sound
}

void loop() {
  delay(75); // slow the tones
  light();
  sound();
}

void predelay(int hours) {
  delay(hours * 3600 * 1000); // hours * seconds per hour * milliseconds
}

void light() {
  // pixel random max R, G, B
  leds[0] =  CRGB(random(2) * random(MAX),  // red
                  random(2) * random(MAX),  // grn
                  random(2) * random(MAX)); // blu
  FastLED.show();
}

void sound() {
  int rnd = random(LO, HI); // delay for tones
  for (int i = 0; i < 25; i++) { // squarewave
    digitalWrite(SPK, HIGH);
    delayMicroseconds(rnd);
    digitalWrite(SPK, LOW);
    delayMicroseconds(rnd);
  }
}

/*************************************************************************************************
  WS2812B                              +-- --+
                                   VCC |-- --| DIN
                                   DOT |-- --| GND
                                       +-- --+
**************************************************************************************************
  ATtiny85                             +-- --+
             PCINT5/-RESET/ADC0/dW/PB5 |1 * 8| VCC
      PCINT3/XTAL1/CLKI/-OC1B/ADC3/PB3 |2   7| PB2/SCK/USCK/SCL/ADC1/T0/INT0/PCINT2
  PWM4/PCINT4/XTAL2/CLKO/OC1B/ADC2/PB4 |3   6| PB1/MISO/DO/AIN1/OC0B/OC1A/PCINT1/PWM1
                                   GND |4   5| PB0/MOSI/DI/SDA/AIN0/OC0A/-OC1A/AREF/PCINT0/PWM0
                                       +-----+
*************************************************************************************************/