Adafruit 1.2" 4-Digit 7-Segment Display
w/I2C Backpack - Yellow
PRODUCT ID: 1269
Description
What's better than a single LED? Lots of LEDs! A fun way to make a numeric display is to use a 4-digit 7segment display. LED matrices like these are 'multiplexed' - so to control all the seven-segment LEDs you
need 14 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 for a variety of 8x8 and 7-segment displays. They
work perfectly with the displays we stock in the Adafruit shop and make adding a bright display trivial.
The backpacks 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 (or a combination, such as four mini 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 LED backpack
Ultra-bright 4-digit 1.2" tall yellow seven-segment display
5-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 very nice libraries for the backpacks so you can get running in under
half an hour, displaying numbers on the 7-segment for either Arduino or Raspberry Pi. If you've been
eyeing matrix displays but hesitated because of the complexity, his is the solution you've been looking for!
Technical Details
Measurements after you mount the screen:
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50mm/2" wide
120mm/4.7" long
13mm/0.5" high
This board/chip uses I2C 7-bit addresses between 0x70-0x77, selectable with jumpers.
Engineered in NYC Adafruit ®
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