int input_pin = 2;

void setup() {
  pinMode(input_pin, INPUT);
  DDRC = 0xFF;
  Serial.begin(9600);
}

void loop() {
  int value = digitalRead(input_pin);
  Serial.print("Input reading: ");
  Serial.println(value);

  PORTC = (1 << PC4) | (1 << PC5) | (1 << PC6) | (1 << PC7);
  delay(1000);
  PORTC = (0 << PC4) | (0 << PC5) | (0 << PC6) | (0 << PC7);
  delay(1000);
}