// Define pins
const int buttonPin = 5;   // Push button attached to PB5 (with ground connection)
const int ledPin1 = 0;     // LED1 attached to PB0
const int ledPin2 = 1;     // LED2 attached to PB1

// Variables to store button state and debouncing
bool buttonState = HIGH;
bool lastButtonState = HIGH;
bool ledState = LOW;       // LED state to toggle
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;  // Debounce time in milliseconds

void setup() {
  // Set pin modes
  pinMode(buttonPin, INPUT_PULLUP);  // Use internal pull-up resistor
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);

  // Start with both LEDs off
  digitalWrite(ledPin1, LOW);
  digitalWrite(ledPin2, LOW);
}

void loop() {
  // Read the button state
  bool reading = digitalRead(buttonPin);

  // Check for button press with debounce
  if (reading != lastButtonState) {
    lastDebounceTime = millis(); // Reset the debouncing timer
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // Only act if the button state has changed
    if (reading != buttonState) {
      buttonState = reading;

      // If the button is pressed (LOW)
      if (buttonState == LOW) {
        // Toggle both LED states
        ledState = !ledState;
        digitalWrite(ledPin1, ledState);    // LED1 follows ledState
        digitalWrite(ledPin2, !ledState);   // LED2 is the inverse of ledState
      }
    }
  }

  // Save the last button state
  lastButtonState = reading;
}