#include <MD_MAX72XX.h>
#include <SPI.h>

// Define the number of devices we have in the chain
#define MAX_DEVICES 4

// SPI connections to the MAX7219 module
#define CLK_PIN   18 // SCK
#define DATA_PIN  19 // MOSI
#define CS_PIN    17 // can be any GPIO pin

// Create a new instance of the library
MD_MAX72XX mx = MD_MAX72XX(CS_PIN, MAX_DEVICES);

void setup() {
  mx.begin();
  mx.control(MD_MAX72XX::INTENSITY, 8); // Set the brightness (0-15)
  mx.clear();
  displayText("hello");
}

void loop() {
  // Nothing needed in the loop for static text
}

void displayText(const char* text) {
  uint8_t charWidth;
  uint8_t cBuf[8];  // character buffer
  mx.clear();

  while (*text != '\0') {
    charWidth = mx.getChar(*text++, sizeof(cBuf)/sizeof(cBuf[0]), cBuf);
    for (uint8_t i=0; i<charWidth; i++) {
      mx.setColumn(i, cBuf[i]);
    }
    delay(1000); // Display each character for 1 second
  }
}