/*#define LED1 2
#define LED2 3
#define LED3 4
#define BUTTON 5

bool isRunning = false;  
unsigned long previousMillis = 0;
const long interval = 1000;
int currentLED = 0;

bool lastButtonState = HIGH;  
bool buttonPressed = false;  
unsigned long lastDebounceTime = 0;
const long debounceDelay = 50; 

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
}

void loop() {
  bool buttonState = digitalRead(BUTTON);
  
  if (buttonState != lastButtonState) {
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (buttonState == LOW && !buttonPressed) {
      isRunning = !isRunning; 
      buttonPressed = true;
    }
  }

  if (buttonState == HIGH) {
    buttonPressed = false;
  }

  lastButtonState = buttonState;

  if (isRunning) {
    unsigned long currentMillis = millis();
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis;

      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);

      if (currentLED == 0) digitalWrite(LED1, HIGH);
      else if (currentLED == 1) digitalWrite(LED2, HIGH);
      else if (currentLED == 2) digitalWrite(LED3, HIGH);

      currentLED = (currentLED + 1) % 3;
    }
  } else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
  }
}
*/
#define LED1 2
#define LED2 3
#define LED3 4
#define BUTTON 5

bool isRunning = false;
unsigned long lastTime = 0;
int currentLED = 0;

void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(BUTTON) == LOW) {
    delay(50); 
    isRunning = !isRunning;
    while (digitalRead(BUTTON) == LOW);
    delay(50);
  }

  
  if (isRunning) {
    unsigned long now = millis();
    if (now - lastTime >= 1000) {
      lastTime = now;
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      if (currentLED == 0) digitalWrite(LED1, HIGH);
      else if (currentLED == 1) digitalWrite(LED2, HIGH);
      else if (currentLED == 2) digitalWrite(LED3, HIGH);
      currentLED = (currentLED + 1) % 3;
    }
  }
  else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
  }
}