Adafruit 0.56" 4-Digit 7-Segment w/I2C Yellow

What's better than a single LED? Lots of LEDs! A fun way to make a small display is to use a 4-digit 7-segment display. Matrices like these are multiplexed, so to control all the seven-segment LEDs you need 14 pins. That's a lot of pins. 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.

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 (the images above are photographed at the dimmest setting to avoid overloading our camera!), 1/16 step display dimming, all via a simple I2C interface. The backpacks come with address-selection jumpers so you can connect up to eight 7-segments on a single I2C bus (2 IO pins only!).

The product kit comes with:

* A fully tested and assembled LED backpack
* Ultra-bright 4-digit 0.56" tall red seven-segment display, yellow
* 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!.