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In this tutorial we will show the steps to use OpenDevice LIBs and easily do communication between a Java application and Arduino

Hardware

In this first tutorial we will use the Arduino to be the most popular platform.

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Software

• Java JDK 1.8 
• Eclipse
• Arduino IDE

Step 1 - Installing the library in Arduino

You can install through the Library Manager, click to the "Sketch" menu and then Include Library > Manage Libraries.

Find OpenDevice and click <Install>

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For a more detailed guide: http://www.arduino.cc/en/guide/libraries

Install from source

To install the library, you can simply clone the repository: opendevice-lib-arduino 

git clone https://github.com/OpenDevice/opendevice-lib-arduino OpenDevice

Rename the folder to "OpenDevice" and put in the "/libraries" folder of the Arduino IDE.

Step 2 - Upload example in to Arduino

When you import the library, a menu for OpenDevice will be created in 'examples' menu. Choose UsbConnection example, plug arduino and click in upload !

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Step 3 - Create a new Java project with maven 

If you already work with maven can skip this part (see the pom.xml example)

The best way to start with Java and Maven is using an IDE like Eclipse or Netbeans, we use Eclipse to be the most practical and does not require installation, simply download and unzip.

3.1 Create a project

1. Click on menu: File > New > Maven Project
If not in the NEW menu, choose Other and browse the list

...

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3. Set the name and the group

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4. Create um new Java Class

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3.2 Add OpenDevice dependency

OpenDevice libraries are managed by maven, he is responsible to download and set up, you simply configure the pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.example</groupId>
	<artifactId>opendevice-tutorial</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<opendevice-version>0.1.2-SNAPSHOT</opendevice-version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>br.com.criativasoft.opendevice</groupId>
			<artifactId>opendevice-connection-stream</artifactId>
			<version>${opendevice-version}</version>
		</dependency>
		<dependency>
			<groupId>br.com.criativasoft.opendevice</groupId>
			<artifactId>opendevice-core</artifactId>
			<version>${opendevice-version}</version>
		</dependency>
	</dependencies>
	
    <repositories>
        <repository>
            <id>oss.sonatype.org</id>
            <url>https://oss.sonatype.org/content/repositories/releases</url>
        </repository>
        <repository>
            <id>oss.sonatype.org-snapshot</id>
            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
        </repository>
    </repositories>
</project>

3.3 Running Demo.java

import br.com.criativasoft.opendevice.core.LocalDeviceManager;
import br.com.criativasoft.opendevice.core.connection.Connections;
import br.com.criativasoft.opendevice.core.model.Device;

public class Demo extends LocalDeviceManager {

    public static void main(String[] args) { launch(args); }

    public void start() throws IOException {

        Device led = new Device(1, Device.DIGITAL);

        connect(out.usb()); // Connect to first USB port available

        while(true){
            led.on();
            delay(500);
            led.off();
            delay(500);
        }
    }
}

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Now you must see the LED blinking in the Arduino

Adding Hardware

Now that you have control of the gates of Arduino, you can control various devices such as lamps, fans, coffeemakers, robots, etc. ..

To control this type of device you will need a relay, which is a device capable of controlling high voltages.

Examples:

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These modules are ready, but it's quite easy to build your own, if you have some knowledge in electronics.

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Reference: http://openenergymonitor.org/emon/buildingblocks/mains-ac-relay-module
Tutorial: http://www.instructables.com/id/Connecting-a-12V-Relay-to-Arduino/

See next step: Adding REST Support

Troubleshooting

and put OpenDevice in /libraries folder of Arduino.