Using Java to control external hardware

Hi all,
I'm new to the forums, I am an experienced Java developer for the internet and have done various GUI based academic and personal projects.
What I want to work on at the moment is basically a swing based controller program which will controller some hardware which switches LEDs on and off, moving later to maybe fans and motors and stuff.
My initial thoughts were get an LED matrix connected using a USB port, and then get a USB API to send commands to this. It would be far better if I somehow got a control board connected (wired or wireless) and then used Java to send over commands for a start to turn LEDs on and off.
In essence I'm in need of answers to 2 questions:
1) what hardware controller to use for this project, and how is it to be connected to my pc.
2) which API?
Thanks, I look forward to your replies.
Harry
Edited by: HPowar on Feb 25, 2008 5:07 AM

I believe that parallax makes a microcontroller (Javelin ???) with some sort of java vm in firmware.
Depending on your budget and assuming you want to go the microcontroller route, it might work for you.
Edited by: johndjr on Feb 25, 2008 8:57 AM

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