Adafruit
Adafruit 7-Segment LED Matrix Backpack
Drive 4-digit 0.56" tall 7-segment displays with ease using this HT16K33-based I2C backpack. The driver handles all LED multiplexing over I2C, keeping your w...
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Drive 4-digit 0.56" tall 7-segment displays with ease using this HT16K33-based I2C backpack. The driver handles all LED multiplexing over I2C, keeping your wiring simple — just two data pins for full numeric display with decimal points and colon.
The backpack is stackable with address jumpers on the back, allowing up to 8 units on the same two I2C wires. Pair it with any of the 0.56" 7-segment displays we stock for a compact, easy-to-read numeric output.
Key Features
- HT16K33 I2C LED Driver – Simple I2C control with no additional pins required
- Stackable – Address jumpers allow up to 8 backpacks on the same I2C bus
- For 0.56" 4-Digit 7-Segment Displays – Supports decimal points and colon
- Arduino and CircuitPython Support – Ready-to-use LED Backpack library
Ideal For
- Clocks and timers
- Sensor readouts and counters
- Score displays and dashboards
- Any project needing a simple numeric display
Package Contents
- 1× Adafruit 7-Segment LED Matrix Backpack (assembled and tested)
- 1× 4-pin header
Jargon buster
Plain-language definitions for the technical terms used above.
- Address jumpers
- Address jumpers are small solder pads, links or switches used to change a device's address on a shared bus such as I2C. They matter when you want to connect several identical devices to the same controller, since each one needs a unique address to avoid conflicts.
- 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 (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- LED driver
- An LED driver is a control chip or circuit that supplies and switches power to LEDs. For a display board, it reduces the number of microcontroller pins needed and handles tasks like lighting the right segments and adjusting brightness.
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