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In this article, I’m going to show how to write a simple program for Arduino UNO R4. I expect most of the steps I follow here can be used for other models of Arduino, but I’m going to be using the LED Matrix that come in the board and will only test on this model. Installing the IDE In order to compile and install our programs into our Arduino, we need to download the Arduino IDE. We can get it from the Arduino Software Page. The installation instructions might vary depending on your OS. I use U...