What's better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8x8 matrix or a 4-digit 7-segment display. Matrices like these are 'multiplexed' - so to control 64 LEDs you need 16 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit, we feel your pain! After all, wouldn't it be awesome if you could control a matrix without tons of wiring? That's where these adorable LED matrix backpacks come in. We have them in two flavours - a mini 8x8 and a 4-digit 0.56" 7-segment. They work perfectly with the matrices we stock in the Adafruit shop and make adding a bright little display trivial. 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 colour (the images above are photographed at the dimmest setting to avoid overloading our camera!), and 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's or eight 7-segments (or a combination, such as four mini 8x8's and four 7-segments, etc) on a single I2C bus. The product kit comes with: * A fully tested and assembled LED backpack * Ultra-bright 8x8 pure green matrix * 4-pin header A bit of soldering is required to attach the matrix onto the backpack but it's very easy to do and only takes about 5 minutes. Of course, in classic Adafruit fashion, we also have a detailed tutorial showing you how to solder, wire and control the display. We even wrote a very nice library for the backpacks so you can get running in under half an hour, displaying images on the matrix or numbers on the 7-segment. If you've been eyeing matrix displays but hesitated because of the complexity, this is the solution you've been looking for! This board/chip uses I2C 7-bit addresses between 0x70-0x73, selectable with jumpers Specifications Backpack Dimensions: * 20mm x 28mm x 4mm * Mounting Holes: 12mm x 22mm Resources * Tutorial and Downloads https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2023-03-06 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2023-12-27 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2024-09-19 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2024-11-29 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2024-11-30 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2025-08-06 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2025-11-28 https://elecena.pl/product/22711340/adafruit-mini-0-8-8x8-led-matrix-with-i2c-backpack-pure-green 2025-11-29