According to this http://www.flickr.com/photos/johngineer/7329403498/in/photostream/lightbox/ there is a problem with using pin 2. I assume because it's physically connected to the SDA pin. I tried changing the bildr example code to use pin 4 and it worked! see also: http://forum.bildr.org/viewtopic.php?f=29&p=5808
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