void setup() {
  Serial.begin(9600); // Initialize serial communication

  bitSet(DDRB, 2); // Set digital pin 10 (PB2) as an output pin
}

void loop() {
  bitSet(PORTB, 2); // Set digital pin 10 (PB2) HIGH

  delay(1000); // Wait for 1 second

  bitClear(PORTB, 2); // Set digital pin 10 (PB2) LOW

  delay(1000); // Wait for 1 second

}