IoT & Hardware
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You're reading from  Android Things Quick Start Guide

Product typeBook
Published inAug 2018
PublisherPackt
ISBN-139781789341799
Edition1st Edition
Tools
Android Things
Concepts
IoT Development
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Author (1)
Raul Portales
Raul Portales
author image
Raul Portales

Raul Portales is a software engineer who has had a love for computers, electronics, and gadgets in general for as long as he remembers. He jumped into Android as soon as it was released. Raul has worked on social networks, education, healthcare, and even founded a gaming studio and a consultancy company. Specializing in mobile and UX, he speaks frequently at conferences and meetups. Raul's love for electronics reignited when Google announced Android Things. He started tinkering with it with the first Developer Preview, which lead to adding the IoT category on his Google Developer expert profile.
Read more about Raul Portales

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Alphanumeric display (Ht16k33)

The most prominent part of the Rainbow HAT is the four-digit, 15-segment alphanumeric display. It takes most of its surface and it is also very handy, since it can be used to display text.

contrib-drivers includes a class named AlphanumericDisplay, which extends from Ht16k33 (the controller chip) and it adds a few string manipulation utilities.

The simplest way to use the display is just five lines of code:

val alphanumericDisplay = RainbowHat.openDisplay()
alphanumericDisplay.setBrightness(Ht16k33.HT16K33_BRIGHTNESS_MAX)
alphanumericDisplay.setEnabled(true)
alphanumericDisplay.display("AHOY")
alphanumericDisplay.close()

As usual, we use the RainbowHat utility method to open the peripheral (in this case, RainbowHat.openDisplay), then we set the brightness (in our example, to the maximum value), and we also set it to enabled. Setting the display...

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Android Things Quick Start Guide
Published in: Aug 2018Publisher: PacktISBN-13: 9781789341799
© 2018 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Raul Portales

Raul Portales is a software engineer who has had a love for computers, electronics, and gadgets in general for as long as he remembers. He jumped into Android as soon as it was released. Raul has worked on social networks, education, healthcare, and even founded a gaming studio and a consultancy company. Specializing in mobile and UX, he speaks frequently at conferences and meetups. Raul's love for electronics reignited when Google announced Android Things. He started tinkering with it with the first Developer Preview, which lead to adding the IoT category on his Google Developer expert profile.
Read more about Raul Portales

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