Akka2RaspberryPi

Control my Raspberry Pi 3B 's GPIO from Akka (with remote client)

What's that about ?

This project is a test run of Akka with Raspberry Pi 3B. It is made of three sbt sub-projects :

• akkaPiClient is a remote client (run it on your desktop)
• akkaPiController is a Pi GPIO controller implementing LEDs (wired on a breadboard)
• akkaPiHttpClient is an API basic client that controls the LEDs through APIs

Network configuration notice

Both client & controller communicate through messages, based on TCP. In this implementation, the following is assumed :

• the Raspberry Pi responds to 192.168.1.51:2553
• the remote client responds to 192.168.1.30:2552

This can be changed from the resources directories of both projects, and in PIClient.scala.

GPIO breadboard configuration

The LEDs are wired to the GPIO using the following configuration from PIGpio.scala

  val leds = List(
    ("gLED", RaspiPin.GPIO_03),
    ("yLED", RaspiPin.GPIO_04),
    ("rLED", RaspiPin.GPIO_05),
    ("bLED", RaspiPin.GPIO_06))

which leads on the breadboard to

• Cobbler #22 / Pin #15 => Green LED
• Cobbler #23 / Pin #16 => Yellow LED
• Cobbler #24 / Pin #18 => Red LED
• Cobbler #25 / Pin #22 => Blue (control) LED

(do not forget the resistors)

My T-cobbler (on the picture below) is for an unknown PI model. Pin numbers relate to the Raspberry Pi 3B expansion header. More details on http://pi4j.com/pins/model-3b-rev1.html

Dependency

The GPIO is addressed through Pi4J (here http://pi4j.com/ or here https://github.com/Pi4J/pi4j/)

For convenience, it is fetched from sbt through

lazy val remoteMavenRepo = "Sonatype Snapshots" at "https://oss.sonatype.org/content/repositories/snapshots/"
resolvers += remoteMavenRepo

lazy val pi4jVersion = "1.2"
libraryDependencies += "com.pi4j" % "pi4j-core" % pi4jVersion

In case your PI3B is not (yet) recognized, You'll need to push the following definition to the JVM -Dpi4j.linking=dynamic

This can easily be done through sbt using

sbt -Dpi4j.linking=dynamic