Dependencies Install JRE/JDK

If you have not already installed a Java runtime environment, please see the following article for a complete set of installation instructions for installing the Oracle JDK.

WiringPi Native Library

Pi4J depends on the WiringPi native library by Gordon Henderson. Please see the following page for more information on WiringPi. https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/

No installation is required for Wiring Pi. Wiring Pi is embedded in the Pi4J native library.

Install Pi4J

Download a copy of the latest Pi4J Debian/Raspian installer package (.deb) file. You can use the following command on the Raspberry Pi's console to download the latest pi4j.jar build: wget http://pi4j.googlecode.com/files/pi4j-0.0.5.deb

NOTE: If you have a previous version of Pi4J installed, please uninstall it first.

Once downloaded, use the following command to perform the installation:

sudo dpkg -i pi4j-0.0.5.deb

This will install the Pi4J libraries and example source files to:

/opt/pi4j/lib /opt/pi4j/examples

When attempting to compile a Java program using the Pi4J libraries, make sure to include the Pi4J lib folder in the classpath:

javac -classpath .:classes:/opt/pi4j/lib/'*' ...

When attempting to start a Java program using the Pi4J libraries, make sure to include the Pi4J lib folder in the classpath:

sudo java -classpath .:classes:/opt/pi4j/lib/'*' ...

If you would like to explore the examples, you can compile all the examples with the following commands:

cd /opt/pi4j/examples ./build Uninstall Pi4J

To uninstall Pi4J from your Raspberry Pi, use the following command:

sudo dpkg -r pi4j

Navigate

If you have not already downloaded and installed the Pi4J library on the RaspberryPi, then view this page for instructions on where to download and how to install Pi4J:

Download & Install Pi4J

First, locate the GPIO_Control.java source file in the samples folder of the Pi4J installation on the RaspberryPi.

You can use the following command on the Pi's console or SSH terminal to navigate to this path:

cd /opt/pi4j/examples

Next, use the following command to compile this example program:

javac -classpath .:classes:/opt/pi4j/lib/'*' -d . GPIO_Control.java

The following command will run this example program:

sudo java -classpath .:classes:/opt/pi4j/lib/'*' GPIO_Control

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