Small 1.2" 8x8 Ultra Bright Square White LED
Matrix + Backpack
PRODUCT ID: 1857
What's better than a single LED? Lots of LEDs! 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 lovely LED matrix backpacks come in. We have them
in three flavors ‐ a mini 0.7" 8x8, a small 1.2" 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 color,
1/16 step display dimming, all via a simple I2C interface. These 1.2" matrix backpacks come with
three address‐selection jumpers so you can connect up to eight 1.2" 8x8's together (or a
combination, such as four 1.2" 8x8's and four 7‐segments, etc) on a single I2C bus.
The product kit comes with:
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A fully tested and assembled 1.2" LED backpack
1.2" 8x8 Matrix Square Pixel White / w/backpack
4‐pin header
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, 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 eying
matrix displays but hesitated because of the complexity, this is the solution you've been looking for!
Technical Details
Matrix Dimensions:
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31mm x 31mm x 7mm / 1.2" x 1.2" x 0.3"
Height without Pins: 7mm / 0.3"
Weight: 7.65g
Backpack Dimensions:
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41mm x 33mm x 2mm / 1.6" x 1.3" x 0.08"
Weight: 5.2g
https://www.adafruit.com/product/1857 12‐4‐17
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