This is a 0.8" green 8x8 LED Matrix with I2C backpack. The matrices use a driver chip that does all the heavy lifting for you: They have a built in clock so they multiplex the display. They use constant-current drivers for ultra-bright, consistent color, 1/16 step display dimming, all via a simple I2C interface. The backpacks come with address-selection jumpers so you can connect up to four mini 8x8 matrices on a single I2C bus.
- A fully tested and assembled LED backpack
- 0.8" yellow-green 8x8 LED Matrix
- 4-pin header
Note: A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes.
Of course, in classic Adafruit fashion, they also have a detailed tutorial showing you how to solder, wire and control the display. Adafruit even wrote a very nice library for the backpacks so you can get running in under half an hour.
Note: This board/chip uses I2C 7-bit address between 0x70-0x77, selectable with jumpers.