#include <Adafruit_NeoPixel.h>

#define PIN            18

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS      12
const byte interruptPin = 2;
#define BRIGHTNESS 255

#define DELAY_ON       50 // Zeitverzögerung zum Einschalten jeder LED
#define DELAY_OFF      50 // Zeitverzögerung zum Ausschalten der ersten LEDs
#define NUM_TO_LIGHT   5

Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
int delayval = 250;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  strip.begin();
  strip.show();            // Turn OFF all pixels ASAP
  strip.setBrightness(BRIGHTNESS);
}

long random(int pixelNum, int numberOfLights) {

  return random(pixelnum - numberOfLights - 10,pixelnum - numberOfLights);
}

void loop() {
  for (int i = 0; i < NUMPIXELS; i++) {
    for (int j = 0; j < NUM_TO_LIGHT; j++) {
      int pixel = i + j;
      if (pixel < NUMPIXELS) {
        strip.setPixelColor(pixel, strip.Color(255, 0, 0)); // Rote LED einschalten
        strip.setPixelColor(random(pixel,NUM_TO_LIGHT),strip.Color(255, 0, 0));
      }
    }
    strip.show();
    delay(DELAY_ON);

    for (int j = 0; j < NUM_TO_LIGHT; j++) {
      int pixel = i + j;
      if (pixel < NUMPIXELS) {
        strip.setPixelColor(pixel, strip.Color(0, 0, 0)); // LED wieder ausschalten
      }
    }
    strip.show();
    delay(DELAY_OFF);
  }
  delay(10);
  
}

void colorWipe(uint32_t color, int wait) {
  for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip...
    strip.setPixelColor(i, color);         //  Set pixel's color (in RAM)
    strip.show();                          //  Update strip to match
    delay(wait);                           //  Pause for a moment
  }
}