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https://github.com/androidthings/sample-simplepio

Basic Peripheral I/O examples with Android Things
https://github.com/androidthings/sample-simplepio

android-things

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Basic Peripheral I/O examples with Android Things

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README 

        
# Simple Peripheral I/O



This Android Things app runs basic code that exercises the Peripheral I/O APIs.

Each sample is an Android module that can be run independently.



> **Note:** The Android Things Console will be turned down for non-commercial

> use on January 5, 2022. For more details, see the

> [FAQ page](https://developer.android.com/things/faq).



## Introduction



This sample provides an introduction to using the [Peripheral I/O][pio] APIs

on Android Things. You will learn the basic concepts of opening connections to

various inputs and outputs for connecting with external peripherals in your app.



**IMPORTANT**: Please, note that these samples are not necessarily the easiest way to accomplish

a task. In particular, they handle all low level I/O protocols directly, on

purpose to showcase how to use the Peripheral APIs. In real world applications,

you should use or develop a suitable driver that encapsulates the manipulation

of low level APIs.



## Screenshots



### Blink



![Blink sample demo][demo1-gif]



[(Watch the demo on YouTube)][demo1-yt]



### Button



![Button sample demo][demo2-gif]



[(Watch the demo on YouTube)][demo2-yt]



### PWM



![PWM sample demo][demo3-gif]



[(Watch the demo on YouTube)][demo3-yt]



## Pre-requisites



- Android Things compatible board

- Android Studio 2.2+



For the Blink sample:

- [Rainbow Hat for Android Things](https://shop.pimoroni.com/products/rainbow-hat-for-android-things) or the following individual components:

    - 1 LED

    - 1 resistor

    - 2 jumper wires

    - 1 breadboard



For the Button sample:

- [Rainbow Hat for Android Things](https://shop.pimoroni.com/products/rainbow-hat-for-android-things) or the following individual components:

    - 1 push button

    - 1 resistor

    - 2 jumper wires

    - 1 breadboard



For the PWM sample:

- 1 servo

- 3 jumper wires

- external power source (recommended, depending on the servo)



## Build and install



On Android Studio, select the module in the select box by the "Run" button, and

then click on the "Run" button.



If you prefer to run on the command line, type



```bash

./gradlew :installDebug

adb shell am start com.example.androidthings.simplepio/.

```



## Sample Specifics



### Blink



If you have the Raspberry Pi [Rainbow Hat for Android Things](https://shop.pimoroni.com/products/rainbow-hat-for-android-things), just plug it onto your Raspberry Pi 3.



![Schematics for Raspberry Pi 3](rpi3_schematics_blink.png)



```bash

    ./gradlew blink:installDebug

    adb shell am start com.example.androidthings.simplepio/.BlinkActivity

```



Blinks an LED connected to a GPIO pin.



### Button



If you have the Raspberry Pi [Rainbow Hat for Android Things](https://shop.pimoroni.com/products/rainbow-hat-for-android-things), just plug it onto your Raspberry Pi 3.



![Schematics for Raspberry Pi 3](rpi3_schematics_button.png)



```bash

    ./gradlew button:installDebug

    adb shell am start com.example.androidthings.simplepio/.ButtonActivity

```



Logs to logcat when a button connected to a GPIO pin is pressed. Make sure you

use a pull-down or pull-up resistor to avoid fluctuation.



### PWM



![Schematics for Raspberry Pi 3](rpi3_schematics_pwm.png)



```bash

    ./gradlew pwm:installDebug

    adb shell am start com.example.androidthings.simplepio/.PwmActivity

```



Moves a servo from one side to the other on regular steps at a predefined rate.



Servos in general have three wires: Vcc, ground and signal. Connect Vcc to the

board's Vcc or, ideally, to an external power. Ground should go to the board's

ground, and signal goes to the PWM pin specified in the BoardDefaults class. The

most common colors for each wire are red for Vin, gray for ground and orange for

signal, but confirm with your servo's datasheet to be sure.



## License



Copyright 2016 The Android Open Source Project, 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



  http://www.apache.org/licenses/LICENSE-2.0



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.



[pio]: https://developer.android.com/things/sdk/pio/index.html

[demo1-yt]: https://www.youtube.com/watch?v=QjX-yfbKAiM&index=4&list=PLWz5rJ2EKKc-GjpNkFe9q3DhE2voJscDT

[demo1-gif]: demo1.gif

[demo2-yt]: https://www.youtube.com/watch?v=pgpTpzl7QWY&list=PLWz5rJ2EKKc-GjpNkFe9q3DhE2voJscDT&index=5

[demo2-gif]: demo2.gif

[demo3-yt]: https://www.youtube.com/watch?v=H148X62lmrQ&list=PLWz5rJ2EKKc-GjpNkFe9q3DhE2voJscDT&index=6

[demo3-gif]: demo3.gif