Light animations - 2-dimensional

You can build an LED matrix using single LEDs but in most cases the commercial one which come in 5 by 7, 5 by 8 or even 8 by 8 will do the job. As they are stackable you can fix as many as you need next to each other.
You also can get the LOL shield offering 9 by 14 LEDs.

To power all the LEDs independently you need to install a multiplex control routine. If you need more port than you got you have to think about decoder chips or do the charlieplexing as done with the LOL shield.

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