const int numLeds = 10;
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};  // Adjust pin numbers if needed

int tailLength = 3;  // Number of LEDs in the trailing tail
int fadeRate = 50;   // Fade speed (lower = faster)
int speedDelay = 100; // Delay between LED shifts

void setup() {
  for (int i = 0; i < numLeds; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < numLeds; i++) {
    // Light up the current LED and fade the tail
    analogWrite(ledPins[i], 255);
    for (int j = 1; j <= tailLength; j++) {
      int tailLed = (i + numLeds - j) % numLeds;
      int brightness = 255 - (j * 255 / (tailLength + 1));
      analogWrite(ledPins[tailLed], brightness);
    }
    delay(speedDelay);

    // Fade out the entire strip
    for (int j = 255; j >= 0; j--) {
      for (int k = 0; k < numLeds; k++) {
        analogWrite(ledPins[k], j);
      }
      delay(fadeRate);
    }
  }
}