こちらのページと同様のことを行いました。
Arduino UNO R4 WiFiのLEDマトリックスを使う

ハートマーク

frame01/frame01.ino

#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

const uint32_t happy[] = {
    0x19819,
    0x80000001,
    0x81f8000
};
const uint32_t heart[] = {
    0x3184a444,
    0x44042081,
    0x100a0040
};
  
void setup() {
	Serial.begin(115200);
	matrix.begin();
}

void loop(){
	matrix.loadFrame(happy);
	delay(2000);

	matrix.loadFrame(heart);
	delay(2000);
}

ウィンク

frame02/frame02.ino

#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

void setup() {
  Serial.begin(115200);
  matrix.begin();
}

uint8_t frame[8][12] = {
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
};

void leftEye(){
  //Left eye
  frame[1][3] = 1;
  frame[1][4] = 1;
  frame[2][3] = 1;
  frame[2][4] = 1;
}

void wink_left(){
  //Wink with the left eye
	frame[1][3] = 0;
	frame[1][4] = 0;
}

void wink_right(){
	frame[1][8] = 0;
	frame[1][9] = 0;
}

void rightEye(){
  //Right eye
  frame[1][8] = 1;
  frame[1][9] = 1;
  frame[2][8] = 1;
  frame[2][9] = 1;
}

void mouth(){
  //Mouth
  frame[5][3] = 1;
  frame[5][9] = 1;
  frame[6][3] = 1;
  frame[6][4] = 1;
  frame[6][5] = 1;
  frame[6][6] = 1;
  frame[6][7] = 1;
  frame[6][8] = 1;
  frame[6][9] = 1;
}

void loop(){
leftEye();
rightEye();
mouth();

matrix.renderBitmap(frame, 8, 12);
delay(2000);

wink_left();
matrix.renderBitmap(frame, 8, 12);
delay(2000);

wink_right();
matrix.renderBitmap(frame, 8, 12);
delay(2000);
}

流れるメッセージ

frame03/frame03.ino

// To use ArduinoGraphics APIs, please include BEFORE Arduino_LED_Matrix
#include "ArduinoGraphics.h"
#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

void setup() {
  Serial.begin(115200);
  matrix.begin();

  matrix.beginDraw();
  matrix.stroke(0xFFFFFFFF);
  // add some static text
  // will only show "UNO" (not enough space on the display)
  const char text[] = "UNO r4";
  matrix.textFont(Font_4x6);
  matrix.beginText(0, 1, 0xFFFFFF);
  matrix.println(text);
  matrix.endText();

  matrix.endDraw();

  delay(2000);
}

void loop() {

  // Make it scroll!
  matrix.beginDraw();

  matrix.stroke(0xFFFFFFFF);
  matrix.textScrollSpeed(50);

  // add the text
  const char text[] = "    Good Morning!    ";
  matrix.textFont(Font_5x7);
  matrix.beginText(0, 1, 0xFFFFFF);
  matrix.println(text);
  matrix.endText(SCROLL_LEFT);

  matrix.endDraw();
}