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Panel led de 4 módulos: MAX7219

Esquema de conexión:

Utilizaremos la biblioteca (que no librería) md_max72xx

https://www.arduino.cc/reference/en/libraries/md_max72xx/

La podemos instalar con el manager de arduino, en tools > Manage Libreries

Yo he instalado MD_Parola que te deja hacer efectos. Te dirá que tiene dependencias y le decimos que instale todas.

Código de proba:

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>
#include <WiFi.h>       
#include <AsyncElegantOTA.h>


// Uncomment according to your hardware type
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
//#define HARDWARE_TYPE MD_MAX72XX::GENERIC_HW

// Defining size, and output pins
#define MAX_DEVICES 4
#define CS_PIN 5

const char* ssid     = "pitufina";
const char* password = "reyvisigodo";

IPAddress ip(192,168,1,69);     
IPAddress gateway(192,168,1,1);   
IPAddress subnet(255,255,255,0); 
IPAddress dns(8,8,8,8);

AsyncWebServer server(80);

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

void setup() {
 
  Display.begin();
  Display.setIntensity(0);
  Display.displayClear();
  Serial.begin(115200);         // Start the Serial communication to send messages to the computer
  delay(10);
  Serial.println('\n');
  
  WiFi.begin(ssid, password);             // Connect to the network
  WiFi.config(ip, gateway, subnet, dns);
  Serial.print("Connecting to ");
  Serial.print(ssid);

  while (WiFi.status() != WL_CONNECTED) { // Wait for the Wi-Fi to connect
    delay(500);
    Serial.print('.');
  }

  Serial.println('\n');
  Serial.println("Connection established!");  
  Serial.print("IP address:\t");
  Serial.println(WiFi.localIP());         // Send the IP address of the ESP8266 to the 

  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(200, "text/plain", "V1.0 27/04/2022 https://pad.eslaeko.net/p/iot_panelbaterias");
  });
  
  
  AsyncElegantOTA.begin(&server);    // Start AsyncElegantOTA
  server.begin();
  Serial.println("HTTP server started");
  Display.print("V 1.0");
  delay(1000);

}

void loop() {

    Display.setTextAlignment(PA_LEFT);
    Display.print("Hola");
    delay(10000);
}