#include <MD_Parola.h>
#include <SPI.h> // 10 = CS, 11 = MOSI, 12 = MISO, 13 = CLK

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 8
#define CS_PIN 10
#define SPEED 40

MD_Parola myDisplay = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);

char message[][12] = {"Andy is IN\0", "Andy is OUT\0"};
byte msg;

int buttonPin = A0;

void setup() {
  myDisplay.begin();
  myDisplay.setIntensity(0);
  myDisplay.displayClear();
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
  if (!digitalRead(buttonPin)) { // read the button
    delay(150); // debounce
    msg = !msg; // change subscript state to choose array element 
  }

  // MD_Parola
  if (myDisplay.displayAnimate()) {
    myDisplay.displayScroll(message[msg], PA_CENTER, PA_SCROLL_LEFT, SPEED);
    myDisplay.displayReset();
  }
}