In this project we will use a as a notification when an obstacle is too close to our sensor. LED We will learn how the standard I/O works with a GPIO in Android Things. Requirements We use a with pre-installed (version 1). Raspberry Pi 3 Android Things Developer Preview I have a cheap and a for this project.You can use any LED what you want, I had only this at home. Obstacle Avoidance Sensor Dual-color Common Cathode LED Setup Google has a really good tutorial how to prepare your Raspberry Pi 3 for Android Things development, so I don’t want to describe it again. Please follow the steps here: _Raspberry Pi 3 Model B is the latest iteration of the world's most popular single board computer. It provides a quad…_developer.android.com Raspberry Pi 3 | Android Things Wiring So, let’s see our sensors. The has 4 pins, we use only 3 of them. The 4th (Null), the top one is not in use. Obstacle Avoidance Sensor As you see in the picture, the bottom one needs to be connected to a ( ) pin on the Pi, the obviously to a 5V power pin, and the pin needs to be connected to a GPIO. Ground GND 5V Digital Output The Digital Output pin sends the signals to our development board if an obstacle is too close. The LED module is a bit simpler. It has only 3 pins, we will use 2 of them, but of course, you can connect all the 3 to your Pi for testing. The connects to a Ground pin on your Pi, and the (or Green on some modules) and the input pins need to be connected to a GPIO (1 pin - 1 GPIO) on your board. (For this project one Input pin is enough to be connected.) GND Yellow Red (If you have a simple LED, you have only 2 pins, 1 Ground and 1 Input pin.) Here is how I connected the with the Raspberry Pi: Obstacle Avoidance Sensor pins → Null → GPIO 21 (BCM21, Pin 40) Digital Output → 5V (Pin 4) 5V → GND (Pin 20) GND And here is how the connect to the Pi: LED pins → GND (Pin 34) GND → GPIO 16 (BCM16, Pin 36) Yellow → GPIO 20 (BCM20, Pin 38) Red And this it how it looks together:(On the left side you can see a pinout diagram which illustrates the locations of the available ports exposed by the breakout connectors of the Raspberry Pi 3 board) Software Google also has a good tutorial how to configure your Android Things project in Android Studio. Please follow the steps here: _Things apps use the same structure as those designed for phones and tablets. This similarity means you can modify your…_developer.android.com Create an Android Things Project | Android Things Now you have a basic, compilable, working Android Things application, so we can start adding the necessary code. In our main Activity we can setup our GPIO pins: Then we initialize the pin ( ) for the as an (we read from this pin): BCM21 Obstacle Avoidance Sensor input Configure the LED pins ( , ) as an (we write to those pins): BCM16 BCM20 output And our , which does the magic: (blinks the led, when the obstacle is too close) GpioCallback() And don’t forget to if you don’t need them: close the resources That’s it! And the end result: I hope you enjoyed the Raspberry Pi hacking with Android. The full project is available on Github: _Contribute to AndroidThings-ObstacleAvoidanceSensor development by creating an account on GitHub._github.com Danesz/AndroidThings-ObstacleAvoidanceSensor

eBay

Google

Yellow

Android Things Basics: Measure distance with Ultrasonic sensor

learn from my mistakes

Read My Stories

Too Long; Didn't Read

Boost your HackerNoon story @ $159.99! 🚀

Android Things Basics: Obstacle avoidance sensor with LED feedback

About Author

Comments

TOPICS

THIS ARTICLE WAS FEATURED IN

Related Stories

Untitled Story

Android Things Basics: Measure distance with Ultrasonic sensor

Java bits: 0xFF and 0xFFL

10 Things You Didn't Know You Could Do With Google Keep

10 Things to check on Android code reviews

10 Mistakes In Mobile App Development That Make You Look Dumb

Android Things Basics: Measure distance with Ultrasonic sensor

Java bits: 0xFF and 0xFFL

10 Things You Didn't Know You Could Do With Google Keep

10 Things to check on Android code reviews

10 Mistakes In Mobile App Development That Make You Look Dumb

Light-Mode

Classic

Newspaper

Dark-Mode

Neon Noir

Minty

HN StartUps