This tiny 20 x 20mm Green LED Matrix is an excellent way to display data or create cool light patterns. Matrices like these are ‘multiplexed’ – so to control 64 LEDs you typically would only need 16 pins on your microcontroller, but in this case, even less. The Matrix includes a backpack complete with a GC7219C driver chip, reducing the number of pins required to just 3. Furthermore, these can be chained together to create even larger displays.