A few Stalker v2.1 glitches that can easily be solved

I finally received my order at SeeedStudio last Wednesday. It came nicely packaged and until yesterday, I had not a chance to test the Stalker. After a few hours playing with it, I must say that this is a really cool Arduino board from which you can do plenty of stuff. I went through the tutorial for the Stalker v2.1 on the Wiki and experienced a few glitches for which I found solutions that might help some of you :-) The problems I had where mostly related to: compatibility with Arduino 1.0 interrupts »