int LED[7] = {27, 26, 25, 32, 33, 14, 13};
int BUTTON = 35;

int currentLED = 0;
bool lastButtonState = HIGH;
bool ledCycling = false;

void setup() {
  for(int i=0;i<7;i++) {
    pinMode(LED[i], OUTPUT);
  }
  pinMode(BUTTON, INPUT_PULLUP);
}

void loop() {
  int buttonState = digitalRead(BUTTON);
  if (buttonState != lastButtonState) { 
    if (buttonState == LOW) { 
      ledCycling = !ledCycling;
    }
    delay(50);
  }
  lastButtonState = buttonState;
  if (ledCycling) {
    for (int i = 0; i < 7; i++) {
      digitalWrite(LED[i], LOW);
    }

    digitalWrite(LED[currentLED], HIGH);

    currentLED++;
    if (currentLED >= 7) {
      currentLED = 0; 
    }

    delay(200);
  }
}