http://www.aitendo.com/product/18592
https://plaza.rakuten.co.jp/aisuke37/diary/201601170000/
https://kousaku-kousaku.blogspot.com/2008/08/arduinoledmax7219.html
https://iot.keicode.com/arduino/arduino-ledmatrix.php
http://www.microfan.jp/booster/dml-try
https://randomnerdtutorials.com/guide-for-8x8-dot-matrix-max7219-with-arduino-pong-game/