The picolib.jar file contains source code (just extract the file contents). The RXTXcomm.jar file is part of the RXTX library, which is open source - just google it.

I've actually done the bulk of this already - I have a few demo scenarios working with a Mega sitting on my desk, one that uses a potentiometer and a button to control a breakout game. I should really polish it up and put it up on the site at some point... Until then, I've thrown the examples up along with a brief explanation at http://www.greenfoot.org/static/Arduino.zip. Let me know if you have any problems, and remember you may need to modify the pin numbers used in code depending on what Arduino you're using and where you've hooked the circuitry up.

Thanks, Davmac. When I play Run, it appears an error message beginning with "java.lang.UnsatisfiedLinkError: C:\Users\Lu\Documents\ArduinoAppoggio\GreenfootArduino\Arduino\Greenfoot_Arduino\Arduino demo LED\native\Windows\rxtxSerial.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform thrown while loading gnu.io.RXTXCommDriver java.lang.UnsatisfiedLinkError: C:\Users\Lu\Documents\ArduinoAppoggio\GreenfootArduino\Arduino\Greenfoot_Arduino\Arduino demo LED\native\Windows\rxtxSerial.dll: Can't load IA 32-bit .dll on a AMD 64-bit platform" I think that my RxTx libraries are not correctly installed (Windows 7 Pro, 64 bit). Is it necessary to download some new version of these libraries? Where it should be placed? Thanks! Luigi

The RxTx libraries are included in mjrb4's zip bundle, in the right place. It looks like for some reason the system is trying to load the 32-bit version of the library instead of (or as well as) the 64-bit version. Maybe you should just remove the 32-bit version from your project (the version in "native\Windows").

We need to uncomment the correct line in the NativePathSetter class. With s+= "native/Windows64;"; its all ok, when the ball touch the house the LED on Pin 13 ligths Thank You very much!!!