Small 1.2" 8x8 Ultra Bright Square Yellow LED
Matrix + Backpack
PRODUCT ID: 1855
Description
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 yellow
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/1855 12‐4‐17
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