Adafruit 0.56" 4-Digit 7-Segment Display

by Adafruit

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, 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.

At Adafruit they 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 the 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.

The product kit comes with:

  • A fully tested and assembled LED backpack
  • Ultra-bright 4-digit 0.56" tall seven-segment display
  • 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, they also have a detailed tutorial showing you how to solder, wire and control the display. They 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!

TECHNICAL DETAILS

This board/chip uses I2C 7-bit address between 0x70-0x77, selectable with jumpers

  • Backpack Dimensions: 27mm x 50mm x 4mm / 1.1" x 2" x 0.16"
  • Backpack Weight: 5.3g
  • 7-Segment Display Dimensions: 19mm x 50mm x 14mm / 0.75" x 2" x 0.56"
  • 7-Segment Display Weight: 8.4g

Datasheets, schematic, EagleCAD PCB files, and Fritzing available in the product tutorial

11 customer reviews

2 years ago
I can strongly recommend this Adafruit 7 seg display with I2C backpack which I am using with Arduino UNO. Using the Adafruit backpack software makes it very easy as the I2C needs just 4 wire connection to the Arduino. Photo of setup using DS18b20 temp sensor
by John about Adafruit 0.56" 4-Digit 7-Segment Display via REVIEWS.io
3 years ago
I've put this in a clock based on an ESP32 that gets the time from an NTP server. The display is bright, it's easy to use (I2C) and program and so far it's been 100% reliable.
by Tim about Adafruit 0.56" 4-Digit 7-Segment Display via REVIEWS.io
5 years ago
Nice & quick service from Pimoroni once again.I purchased this display along with a few other items as it was part of a circuit in Simon Monks book 'Programming the Raspberry'. Worked first time!
by Peter about Adafruit 0.56" 4-Digit 7-Segment Display via REVIEWS.io

1 user photo