#define LED_PIN PA5       // Onboard LED pin
#define BUTTON_PIN PB0    // Push button pin

void setup() {
  pinMode(LED_PIN, OUTPUT);         // Set LED pin as output
  pinMode(BUTTON_PIN, INPUT_PULLUP); // Set button pin as input with pull-up resistor
}

void loop() {
  if (digitalRead(BUTTON_PIN) == LOW) { // Check if button is pressed
    digitalWrite(LED_PIN, HIGH);  // Turn LED on
  } else {
    digitalWrite(LED_PIN, LOW);   // Turn LED off
  }
}