// This line tells the computer that we want to name D2, which is the pin we will connect our LED
// to, "LED_PIN"
#define LED_PIN PD2

// This line tells the computer that we want to name D3, which is the pin we will connect our LED
// to, "BUTTON_PIN"
#define BUTTON_PIN PD3


// Everything inside the curly braces after the word setup() is run one time
// when the computer first boots up
void setup() {
  // This line tells the Arduino that it will have to send 
  // electricity out from the pin we connect our LED to
  pinMode(LED_PIN, OUTPUT);

  // This line tells the Arduino that it will have to read 
  // whether or not electricity is flowing through our button
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

// Everything inside the curly braces after the word loop() is repeated over
// and over again by the Arduino
void loop() {
  // This line checks if the button is pushed, if it is, the computer follows the instructions
  // in the code in the curly braces after "if", if it isn't, the computer follows the
  // instructions in the code in the curly braces after "else"
  if (!digitalRead(BUTTON_PIN)) {
    // This line tells the computer to start sending electricity out to the LED to turn it on.
    // It tells the Arduino to make the voltage HIGH at the pin we named LED_PIN
    digitalWrite(LED_PIN, HIGH);

    // This line tells the computer to wait for 0.1 seconds
    delay(100);

    // This line tells the computer to stop sending electricity out to the LED to turn it off.
    // It tells the Arduino to make the voltage LOW at the pin we named LED_PIN   
    digitalWrite(LED_PIN, LOW);

    // This line tells the computer to wait for 0.1 seconds
    delay(100); 
  } else {
    // This line tells the computer to start sending electricity out to the LED to turn it on.
    // It tells the Arduino to make the voltage HIGH at the pin we named LED_PIN
    digitalWrite(LED_PIN, HIGH);

    // This line tells the computer to wait for 1 second
    delay(1000);

    // This line tells the computer to stop sending electricity out to the LED to turn it off.
    // It tells the Arduino to make the voltage LOW at the pin we named LED_PIN   
    digitalWrite(LED_PIN, LOW);

    // This line tells the computer to wait for 1 second
    delay(1000); 
  } 

  // Here, the computer goes back at the beginning of the curly braces and does it again  
}