Sorry for the belated post with the solutions but Mondays are sometimes very busy 🙂
We got 25 submissions, some of them with 7-8 solutions inside.
For the moment I think the winner is Befunge solution with one character ‘.’
You can see all solutions on GitHub: https://github.com/OLIMEX/WPC/tree/master/ISSUE-33
Have fun looking at them!
olimex 
Nov 21, 2013 @ 15:22:14
Second place must go to Dave, but congratulations to everybody! ‘program p(input, output) begin repeat writeln() until false end.’ was never going to win.
When will OLIMEXINO-85BC be available?