#include <MD_MAX72xx.h>
#include <SPI.h>

#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 1

#define DATA_PIN 23
#define CLK_PIN 18
#define CS_PIN 5

MD_MAX72XX mx = MD_MAX72XX(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

void setup() {
  mx.begin();
  mx.control(MD_MAX72XX::INTENSITY, 5);
  mx.clear();
}

void loop() {
  mx.setPoint(0,0,true);
  delay(500);
  mx.setPoint(0,0,false);
  delay(500);
}