The truth is that [Kerimil] didn’t spend forever learning Java and programming the app. Instead he’s showing off the power of App Inventor to get your Android controls up and running fast.

In fact, that’s how the Arduino IDE flashes the board. This should have been obvious since the board is really just a breakout for the SAM D21 chip which is already supported.

Learn how to control and blink multiple LEDs using the MAX7219 driver with Arduino. A simple guide for beginners in electronics and coding. #Arduino #MAX7219 #LEDProjects #ElectronicsTutorial ...