#include <MD_MAX72xx.h>

#include <MD_Parola.h>
#include <SPI.h>

const byte clock_pin = 13;
const byte data_pin = 11;
const byte chip_select_pin = 10;

const byte max_devices = 4;

String data = "";

MD_Parola matrix = MD_Parola(MD_MAX72XX::PAROLA_HW, chip_select_pin, max_devices);

void setup(){
  Serial.begin(9660);
  matrix.begin();  
  matrix.displayClear(); 
  Serial.println("Enter your text: ");
}

void loop(){
  if (Serial.available()){
    data = Serial.readStringUntil('\n');
  }
  else if (data != ""){
    matrix.setTextAlignment(PA_CENTER);
    matrix.setInvert(false);
    matrix.print(data);
    delay(1000);
    matrix.setInvert(true);
    matrix.print(data);
    delay(1000);
  }
}