#define LED_PIN PA0
#define BUTTON_PIN PA1

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLDOWN); // Use internal pull-down resistor
}

void loop() {
  if (digitalRead(BUTTON_PIN) == HIGH) {
    digitalWrite(LED_PIN, HIGH); // Turn LED ON when button pressed
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn LED OFF when button released
  }
}