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HT16K33 display driver for Android Things

This driver supports segment displays built on the HT16K33 LED driver

NOTE: these drivers are not production-ready. They are offered as sample implementations of Android Things user space drivers for common peripherals as part of the Developer Preview release. There is no guarantee of correctness, completeness or robustness.

How to use the driver

Gradle dependency

To use the ht16k33 driver, simply add the line below to your project's build.gradle, where <version> matches the last version of the driver available on jcenter.

dependencies {
    compile '<version>'

Sample usage

Use the AlphanumericDisplay class to easily drive a 14-segment display. Use the Ht16k33 class when driving other types of HT16K33 led matrices.


// Access the display:

AlphanumericDisplay mDisplay;

try {
    mDisplay = new AlphanumericDisplay(i2cBusName);
} catch (IOException e) {
    // couldn't configure the display...

// Display some text:

try {
} catch (IOException e) {
    // error setting display

// Close the display when finished:

try {
} catch (IOException e) {
    // error closing display


Copyright 2016 Google Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.