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LEDS / SEGMENTED / ADAFRUIT 1.2" 4-DIGIT 7-SEGMENT DISPLAY W/I2C BACKPACK - RED
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 7-segment 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
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Adafruit 1.2" 4-Digit 7-
Segment Display
w/I2C Backpack - Red
PRODUCT ID: 1270
IN STOCK
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DESCRIPTION
TECHNICAL DETAILS
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:
A fully tested and assembled LED backpack
Ultra-bright 4-digit 1.2" tall red 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!
Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack Red (1:50)
TECHNICAL DETAILS
LEARN
New Products 2/16/2013
Measurements after you mount the screen:
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.
EagleCAD PCB files, datasheets, and Fritzing available in the product tutorial
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Red 7-segment clock
display - 0.56" digit height
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Matrix Backpack
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Bargraph - Pack of 2
Adafruit 1.2" 4-Digit 7-
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Adafruit 7-Segment
Backpack - 1.2" Tall Digits
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