#define led_pin 2 // Arduino number | ATtiny PA02
#define button_pin 23 // Arduino number | ATtiny PA23

int button_state = 0;

void setup() {
  // Initialize serial communications at 9600 bps
  // Only used for debug
//  Serial.swap(1);
//  Serial.begin(9600);
//  while(!Serial);

  // Initialize the LED pin as an output
  pinMode(led_pin, OUTPUT);
  // Initialize the button pin as an input
  pinMode(button_pin, INPUT);
}// void setup

void loop() {
  // Read the state of the pushbutton value
  // If it is pressed the button_state is LOW
  // When the button is open (unpressed) there is no connection between the two
  // legs of the button, so the pin is connected to 5V and we read a HIGH.
  button_state = digitalRead(button_pin);
  
  // Check if the button is pressed
  if (button_state == HIGH) {
    digitalWrite(led_pin, HIGH);
  } else {
    digitalWrite(led_pin, LOW);
  }//else

  //Only used for debug
//  Serial.print(button_state);
}// void loop