adafruit-circuitpython-ht16k33

Introduction

This is a library for using the I²C-based LED matrices with the HT16K33 chip. It supports both 16x8 and 8x8 matrices, as well as 7- and 14-segment displays.

Notes
1. This library is intended for Adafruit CircuitPython’s API. For a library compatible with MicroPython machine API see this library.
2. This library does not work with the Trellis 4x4 LED+Keypad board. For that product use: CircuitPython Trellis Library

Dependencies

This driver depends on:

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle.

Installing from PyPI

On supported GNU/Linux systems like the Raspberry Pi, you can install the driver locally from PyPI. To install for current user:

pip3 install adafruit-circuitpython-ht16k33

To install system-wide (this may be required in some cases):

sudo pip3 install adafruit-circuitpython-ht16k33

To install in a virtual environment in your current project:

mkdir project-name && cd project-name
python3 -m venv .venv
source .venv/bin/activate
pip3 install adafruit-circuitpython-ht16k33

Usage Example

# Import all board pins and bus interface.
import board
import busio

# Import the HT16K33 LED matrix module.
from adafruit_ht16k33 import matrix

# Create the I2C interface.
i2c = busio.I2C(board.SCL, board.SDA)

# Create the matrix class.
# This creates a 16x8 matrix:
matrix = matrix.Matrix16x8(i2c)
# Or this creates a 8x8 matrix:
#matrix = matrix.Matrix8x8(i2c)
# Or this creates a 8x8 bicolor matrix:
#matrix = matrix.Matrix8x8x2
# Finally you can optionally specify a custom I2C address of the HT16k33 like:
#matrix = matrix.Matrix16x8(i2c, address=0x70)

# Clear the matrix.
matrix.fill(0)

# Set a pixel in the origin 0,0 position.
matrix[0, 0] = 1
# Set a pixel in the middle 8, 4 position.
matrix[8, 4] = 1
# Set a pixel in the opposite 15, 7 position.
matrix[15, 7] = 1
matrix.show()

# Change the brightness
matrix.brightness = 8

# Set the blink rate
matrix.blink_rate = 2

Documentation

API documentation for this library can be found on Read the Docs.

For information on building library documentation, please check out this guide.

Contributing

Contributions are welcome! Please read our Code of Conduct before contributing to help this project stay welcoming.

Metadata

Release files for adafruit-circuitpython-ht16k33 4.6.17

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for adafruit-circuitpython-ht16k33 4.6.17
File	Size	Uploaded
adafruit_circuitpython_ht16k33-4.6.17.tar.gz	35.6 kB	Apr 23, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for adafruit-circuitpython-ht16k33 4.6.17
File	Interpreter	ABI	Platform	Reset
adafruit_circuitpython_ht16k33-4.6.17-py3-none-any.whl 16.2 kB Apr 23, 2026	Python 3	none	any	Details

Total release size: 51.9 kB

Release files / adafruit_circuitpython_ht16k33-4.6.17.tar.gz

Download URL	adafruit_circuitpython_ht16k33-4.6.17.tar.gz
Size	35.6 kB
Tags	Source
SHA-256 checksum How to use checksums	`753012d3f12752213577eb55e4f35c4095beb9d3da63f6d0a9d9f876129deb58`
BLAKE2b-256 checksum How to use checksums	`2276d22dbcd81004526ae6b94dd11f5b463602b30bd1c045a18b71af38483079`
Upload date	Apr 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.11.15`

Release files / adafruit_circuitpython_ht16k33-4.6.17-py3-none-any.whl

Download URL	adafruit_circuitpython_ht16k33-4.6.17-py3-none-any.whl
Size	16.2 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`6c04ead88692fbe2dfd430be1ac8a116054f70153da73062cfec9f7ab0d1b9e1`
BLAKE2b-256 checksum How to use checksums	`18d95d0b8ca415a1a92458f25e4d55c96e78458a9360779f79b48e963808edd1`
Upload date	Apr 23, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`twine/6.2.0 CPython/3.11.15`