This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
Please do not post the same question in multiple forums. This is called cross-posting. It causes confusion and duplication of effort which will annoy the people who would otherwise help you making it less likely that you will get an answer to your question.