Adafruit
Adafruit 0.56 4-Digit 7-Segment Display w/I2C Backpack - Blue
The Adafruit 0.56" 4-Digit 7-Segment Display with I2C Backpack in blue makes it easy to add a bright numeric display to any microcontroller project. The back...
The Adafruit 0.56" 4-Digit 7-Segment Display with I2C Backpack in blue makes it easy to add a bright numeric display to any microcontroller project. The backpack handles all LED multiplexing and driving via I2C, so you only need two data pins to control a full 4-digit display.
The HT16K33 driver chip provides constant-current output for consistent brightness, 1/16-step dimming control, and a built-in oscillator — no external components needed. Address-selection jumpers allow up to eight 7-segment displays on a single I2C bus.
Key Features
- HT16K33 I2C Driver – Built-in multiplexing, constant-current drive, and 1/16-step dimming
- Simple I2C Interface – Only two pins required, with address jumpers for up to 8 displays on one bus
- Ultra-Bright Blue LEDs – 0.56" digit height, visible from a distance
- Arduino and CircuitPython Libraries – Well-documented libraries for quick setup
- Compact Design – Backpack mounts directly behind the display
Also Available
Also available in a larger 1.2" size, or as a pre-assembled version.
Package Contents
- 1× Adafruit I2C LED backpack (assembled and tested)
- 1× 0.56" 4-digit 7-segment blue display
- 1× 4-pin header
Jargon buster
Plain-language definitions for the technical terms used above.
- Address jumpers
- Address jumpers are small solder pads or links used to change a device’s bus address. They matter when you want to connect multiple identical displays to the same controller without their addresses conflicting.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
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