// This is a simple Arduino program to
// read the value of digital pin 7
// coming from Atari 800xl joystick port 1

// initializations
void setup() 
{
  Serial.begin(9600);  // Initialize serial communication
  pinMode(7, INPUT);   // Set digital pin 7 as input to program
}

// A loop to read value of digital pin 7 and print
// to the serial monitor in the Arduino IDE
void loop() 
{
  int value = digitalRead(7); // Read the value from digital pin 7
  char zero[] = "Joystick Data = 0";
  char one[] = "Joystick Data = 1";

  if(value == 0) // joystick sending 0s as data from POKE 54016,0
  {
    Serial.println(zero);
  }

  if(value == 1) // joystick sending 1s as data from POKE 54016,255
  {
    Serial.println(one);
  }

  delay(3000);   // Delay for 3000 milliseconds or 3 seconds
}