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to provide some filtering on the power supply
56MHz 1K card
Adafruit even wrote a very nice library for the backpacks so you can get running in under half an hour
The regulator can provide at least 150mA
16x8 1.2" LED Matrix + Backpack - Ultra Bright Square Green LEDs screw terminal to provide some filtering onWhat's better than a single LED? Lots of LEDs! And what's better than lots of LEDs? TWO TIMES AS MANY LEDS!!! With the 16x8 LED Matrix Backpack we've doubled your project's matrix capacity by making it super easy to get two separate 8x8 matrices onto one handy board! Matrices like these are 'multiplexed' so to control 64 LEDs you need 16 pins and to control 128 LEDs, you'd need 24 pins. That's a lot of pins, and there are driver chips like the MAX7219
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