Garland

#include <FastLED.h>
#include <EEPROM.h>

#define LED_PIN     5
#define BRIGHTNESS  255
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB
#define WIDTH       5
#define HEIGHT      10
#define NUM_LEDS   WIDTH * HEIGHT
CRGB leds[NUM_LEDS];

#define UPDATES_PER_SECOND 100
#define GARLAND_COLORS 10
#define HUE_STEP 256 / GARLAND_COLORS
#define SWITCH_DELAY 60
#define MODES 2
#define RAINBOW_LENGTH 30
#define RAINBOW_HUE_STEP 256 / RAINBOW_LENGTH

#define MODE_CELL 1

int currentLed = 0;
byte mode = 2; //Гирлянда
unsigned long lastChange = 0;
unsigned long switchDelay = 0;
byte rainbowShift = 0;
unsigned long lastModeChange = 0;
unsigned int modeChangeStep = 0;
bool modeChanged = false;
bool autoChangeMode = false;


void setup() {
  //put your setup code here, to run once:
    delay(500); // power-up safety delay
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);//.setCorrection( TypicalLEDStrip );
    FastLED.setBrightness(  BRIGHTNESS );
    randomSeed(analogRead(0));
    lastChange = millis();
    switchDelay = (unsigned long)SWITCH_DELAY * 1000;
    byte initMode = EEPROM.read(MODE_CELL);
    if (initMode > MODES) {
      initMode = 0;
    }

    autoChangeMode = initMode == 0;
    if (initMode == 0) {
      mode = 1;
    } else {
      mode = initMode;
    }
    initMode++;
    EEPROM.write(MODE_CELL, initMode);
}

void loop() {
  delay(10);
  if (autoChangeMode && (millis() - lastChange >= switchDelay)) {
    changeModeTick();
  }
  switch (mode) {
    case 1: // Гирлянда
      garland();
      break;
    case 2: //радуга
      rainbow();
      break;
  }

  FastLED.show();
}
void changeModeTick() {
  if (millis() - lastModeChange >= 12) {
    modeChangeStep++;
    if (!modeChanged && modeChangeStep >= BRIGHTNESS) {
      changeMode();
      return;
    }
    if (modeChanged && modeChangeStep >= BRIGHTNESS * 2) {
      lastChange = millis();
      modeChangeStep = 0;
      lastModeChange = millis();
      modeChanged = false;
      FastLED.setBrightness(BRIGHTNESS);
      return;
    }
    if (modeChangeStep < BRIGHTNESS) {
      FastLED.setBrightness(BRIGHTNESS - modeChangeStep);
    } else {
      FastLED.setBrightness(modeChangeStep - BRIGHTNESS);
    }
    lastModeChange = millis();
  }
}

void changeMode() {
    mode++;
    if (mode > MODES) {
      mode = 1;
    }
    modeChanged = true;
}

void garland() {
  if (random(10000) > 9000) {
    lightRandomLed();
  }
  fadeAllLeds();
}

void fadeAllLeds() {
  for (int i = 0; i < NUM_LEDS; i++) {
    leds[i].fadeToBlackBy(5);
    uint8_t luma = leds[i].getLuma();
    if (luma < 20) {
       leds[i] = getRandomColor();
    }
  }
}

void lightRandomLed() {
  int ledNumber = random(NUM_LEDS);
  leds[ledNumber] = getRandomColor();
}

void rainbow() {
  for (int i = 0; i < NUM_LEDS; i++) {
    int colorIdx = i % RAINBOW_LENGTH;
    int hue = (HUE_STEP * colorIdx + rainbowShift) % 256;
    leds[i] =  CHSV(hue, 255, 255);
  }
  //int colorIdx = currentLed % RAINBOW_LENGTH;
  //int hue = HUE_STEP * colorIdx;
  //leds[currentLed] =  CHSV(hue, 255, 255);
  //currentLed++;
  //if (currentLed >= NUM_LEDS) {
//    currentLed = 0;
//  }
  rainbowShift++;
}

void testColor() {
  //leds[currentLed] = CRGB::Black;
  leds[currentLed] = getRandomColor();
  if (currentLed >= NUM_LEDS) {
    currentLed = 0;
  }
  currentLed++;
}

CRGB getRandomColor() {
  int colorIdx = random(GARLAND_COLORS);
  int hue = HUE_STEP * colorIdx;
  CRGB color = CHSV(hue, 255, 255);
  return color;
  CRGB color2 = CHSV( random(256), random(80) + 176, 255);
  return color2;
}