Javantura v3 - The Internet of (Lego) Trains – Johan Janssen, Ingmar van der Steen
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The document discusses connecting a model train set to the internet using a Raspberry Pi. It describes using a Raspberry Pi, wifi dongle, battery pack, and infrared transmitter to control the trains remotely over a web interface using HTTP requests. It also discusses using Scala and Akka actors as an alternative architecture to more loosely couple the train control components.
![class Coordinator extends Actor {
def receive = {
case mymessage =>
println(mymessage)
}
}
implicit val system = ActorSystem("ExampleActorSystem")
val coordinatorActorRef = system.actorOf(Props[Coordinator])
coordinatorActorRef ! "Hello Javantura"](https://image.slidesharecdn.com/javanturav3-theinternetoflegotrainsjohanjansseningmarvandersteen-160222090954/85/Javantura-v3-The-Internet-of-Lego-Trains-Johan-Janssen-Ingmar-van-der-Steen-30-320.jpg)
![val coordinatorActorRef =
system.actorOf(Props[Coordinator])
coordinatorActorRef ! "Hello Javantura "
val coordinatorActorRef =
context.actorSelection("akka.tcp://
ExampleActorSystem@127.0.0.1:9005
/user/coordinatorActor")
coordinatorActorRef ! "Hello Javantura "](https://image.slidesharecdn.com/javanturav3-theinternetoflegotrainsjohanjansseningmarvandersteen-160222090954/85/Javantura-v3-The-Internet-of-Lego-Trains-Johan-Janssen-Ingmar-van-der-Steen-31-320.jpg)
![akka {
actor {
provider =
"akka.remote.RemoteActorRefProvider"
}
remote {
enabled-transports =
["akka.remote.netty.tcp"]
netty.tcp {
hostname = "127.0.0.1"
port = 9002](https://image.slidesharecdn.com/javanturav3-theinternetoflegotrainsjohanjansseningmarvandersteen-160222090954/85/Javantura-v3-The-Internet-of-Lego-Trains-Johan-Janssen-Ingmar-van-der-Steen-32-320.jpg)
Javantura v3 - The Internet of (Lego) Trains – Johan Janssen, Ingmar van der Steen
- 1. The Internet of (Lego)Trains Johan Janssen, Info Support @johanjanssen42 [email protected] Ingmar van der Steen, Info Support [email protected]
- 2. Disclaimer: No Lego was harmed beyond repair during the project.
- 4. Why?
- 5. MINIMAL INGREDIENTS FOR 1TRAIN ABOUT € 50 Raspberry Pi A+ Wifi dongle EDUP Ultra-Mini Nano USB 2.0 802.11n USB battery pack Anker® 2. Gen Astro Mini 3200mAh Infrared transmitter Keyes 38KHz IR InfraredTransmitter Module for Arduino
- 7. Architecture
- 8. LTCC (Angular) LTCC (Java) DeviceControl (Java) Infrared (C and LIRC) RFID (C) SwitchControl (Java) Servo (Python) Leds with Photon (C) RPi-Cam-Web- Interface (C)
- 9. LTCC (Laptop)SwitchControl (Pi) Camera (Pi) Device Control (Pi)
- 11. Infrared
- 12. CALLINGTHE APPLICATION http://ipaddress/cgi-bin/test/?ch=0&out=1&cmd=1&spd=3 ch: channel (there are 8) out: output cmd: command 0 Break 1 Forward 2 Backward spd: speed (not necesarry with command ‘Break’)
- 13. @Path("train") public class TrainService { @GET @Path("{channelParam}/forward/{speedParam}") public void forward(@PathParam("channelParam") String channel, @PathParam("speedParam") String speed) { String command = "1"; callURL(channel, command, speed); } private void callURL(String channel, String command, String speed) { StringBuilder result = new StringBuilder(); result.append("http://127.0.0.1/cgi-bin/test/?ch="); result.append(channel); result.append("&out=1&cmd="); result.append(command); if (speed != null) { result.append("&spd="); result.append(speed); } URL url = new URL(result.toString()); InputStream is = url.openStream(); } }
- 14. Sound
- 15. RFID 3.3V, GPIO25, GND, -, GPIO9, GPIO 10, GPIO11, GPIO 8
- 17. Camera
- 19. Overview camera
- 20. Switches
- 22. LTCC APPLICATION
- 24. Challenges
- 25. SCALA AND AKKA
- 26. HTTP VS REMOTE ACTOR
- 27. ADVANTAGES REMOTE ACTORS No converting to JSON/SOAP More natural programming Faster than Akka HTTP ?
- 28. ADVANTAGES HTTP Indepedent of technology Loosely coupled
- 29. LTCC (Angular) LTCC (Scala/Akka) DeviceControl (Scala/Akka) Infrared (C and LIRC) RFID (C) SwitchControl (Scala/Akka) Servo (Python) Leds with Photon (C) RPi-Cam-Web- Interface (C)
- 30. class Coordinator extends Actor { def receive = { case mymessage => println(mymessage) } } implicit val system = ActorSystem("ExampleActorSystem") val coordinatorActorRef = system.actorOf(Props[Coordinator]) coordinatorActorRef ! "Hello Javantura"
- 31. val coordinatorActorRef = system.actorOf(Props[Coordinator]) coordinatorActorRef ! "Hello Javantura " val coordinatorActorRef = context.actorSelection("akka.tcp:// [email protected]:9005 /user/coordinatorActor") coordinatorActorRef ! "Hello Javantura "
- 32. akka { actor { provider = "akka.remote.RemoteActorRefProvider" } remote { enabled-transports = ["akka.remote.netty.tcp"] netty.tcp { hostname = "127.0.0.1" port = 9002
- 34. CONCLUSION
- 35. The best part!!
- 36. QUESTIONS? Johan Janssen, Info Support @johanjanssen42 [email protected] Ingmar van der Steen, Info Support [email protected]
Editor's Notes
- #5: - Ervaring opdoen met IoT - Kijken of de software die we dagelijks gebruiken geschikt is voor IoT - Kinderen leren programmeren/interesseren - Zichtbaar/tastbaar, makkelijk om concepten uit te leggen Een excuus hebben voor mijn vrouw om met Lego te mogen spelen HR and recruitment love it as a tool to draw in new developers!
- #7: You can also make it a bit bigger with camera, RFID, speaker
- #25: We burned some, Magic smoke was lost Raspberry and transmitter … Usually Pi’s are tough and simple, but also small… Raspberry burned out through poweradapter for switch servos. (whoops) Infrared transmitters where harmed in this project.
- #26: Trying new tech. We try Akka! Popular with customers. Try out project. Akka in shorts: Actor based, message based system for scalable distributed apps. … We introduced actors to our trains… Akka apparently is a mountain range. Popular in Sweden? As akka in Sweden right. So we started using akka in some customer projects and said: Lets try akkafy the trains!
- #30: Java and REST -> Scala and remote actors Can be faster, But, also more coupling … Lets show some akka… We switched from REST services to AKKA actor based system. More tightly coupled than just REST - Can be faster (mostly, ask us about the details!)
- #31: These are akka basics Extend Actor, implement receive. Use caseclasses for different messages. Actors call eachother with messages This is for creating a local actor. Akka is easy to convert to distributed. …Remote actors are almost as simple… Above is code for a supersimple actor that will print any message it gets.
- #32: Top same as previous Changes to make when using remote actors. Not exactly the same, one is creating an actor, the lower one is calling a pre-existing remote actor. This is not the talk for advanced akka stuff, but this illustrates how simple it is to use remote actors in akka.
- #33: Configuration needed for remote actors with akka. Application.conf Use 0 for random port, and good luck with finding it . Enough about akka. … So of course we have tons of ideas and stuff we want to add…
- #34: Charging with induction Collision detection by graduation student Raspberry Pi zero only for the white train as the blue train uses the Raspberry Pi camera and the zero has no connection for that camera Reactive Pi to control the Raspberry Pi directly from Scala/Akka instead of using C/Python
- #35: Sum up Play with lego;s like kids Show and tells for grownups Testdrive akka, experience Come to Jfokus in beaty stockholm … That’s not even the best part. The best part is … Ervaring opgedaan met hardware/IoT Java en Scala/Akka werken blijkbaar prima - Marketing stands op conferenties Scala/Akka ervaring REST vs Remote Actors Ons hier gebracht
- #36: The best part: You get to play with lego’s that bring you beer. … If there is time questions…