Ruby & Mindstorms NXT 21955
Using Ruby with your Mindstorms NXT is easy using RubyNXT. But it still requires a bluetooth connection or USB connection.
How cool would it be if it was possible to write a Ruby program, upload it (in sourcecode) to your NXT brick and have a Ruby interpreter firmware running on the NXT? It wouldn’t be needed to port the whole Ruby Standard Library, it wouldn’t even be needed to convert the whole Ruby Core Library.
So what would be needed to get this to work? Cross-compilation of Ruby to ARM, someone already ported Ruby to his Zaurus. A new firmare is needed.
Maybe better yet is the use of a Ruby VM like YARV and get that to run on the Mindstorms brick. Still, that needs to be cross compiled and a new firmware is needed.
Ruby is a fully object oriented programming language and is fairly easy to learn, even easier to use. More and more programmers learn Ruby.

Hey I’m one of the two developers working on ruby-nxt. Just wanted to drop you a line and let you know we’re actively reading stuff like this in the NXT + Ruby community.
A mini-Ruby VM for the NXT would be awesome indeed. Another possibility is a Ruby-based bytecode generator. i.e. you write some Ruby code, and it gets compiled into an NXT binary ready for uploading.
That said, I think the ruby-nxt approach, where all your processing is done on a computer/laptop is really the way to go. The NXT brick itself is pretty limited in terms of memory and processing power. You can do a lot more complex and interesting stuff if your let your computer act as the NXT’s brain.
The one problem we’ve come up against is that Bluetooth direct commands are a bit slow as compared to native code. Mind you, they’re fast enough for most things, but there can be a split second delay between successive commands. This is a bit problematic when doing fine movements or rapid reactions. Tony Buser has uncovered some interesting hidden functionality in the NXT that lets us get around some of this (auto-adjusting for precision movements, for example) but it remains a challenge.
Hey thanks for dropping by, I didn’t see this comment, probably due to caching and (my own) time restraints. We’ll I just thought that if LeJOS could do it with the old brick, why can’t it work with Ruby? Memory and processing-power wise it’s indeed not perfect, but one got to keep dreaming :D I’ll certainly give ruby-nxt a try.
Hey,
I’m the David Anderson that wrote LibNXT (thanks for your info on getting it working on OSX, I needed that :) ).
I’m no ruby fan myself (no offense to the language, I just learnt python first), but I am planning on writing an open source firmware for the nxt. The Grand Plan for that firmware is to initialize all the hardware, expose a C API to use that initialized hardware, and then boot a single user application (probably payloaded with the kernel for the time being). That application can be anything, as long as it initially boots up following C calling conventions, so I don’t see why it couldn’t be a Ruby VM, assuming that Ruby can fit into
I’m planning on a Lua VM myself. Right now, I’ve written the kernel bootstrapping code, as well as the toolchain support code (GNU ld scripts to specify the binary image format), and as soon as I can get a JTAG debugger to help me along I’m going to start work on Electric Storm, the beginnings of an open source firmware :-).
Party on!
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