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...
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 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.
- 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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