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Would adding a serial output to the MPGuino require substantial coding? or is it just a matter of finding someone who is familiar with these sorts of electronics to add that physical interface?
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I have the 'spiffie' hardware that has a USB plug on it. dcb's code (at least version 0.75) already has a serial output enabled and active. If you plug the USB into your PC, the PC recognizes it as a serial port, and you should see economy, speed, etc. being spit out.
Does the prebuilt unit have a USB plug on it? If so, and you are running at least version 0.75 of the MPGuino software, what you are asking for is already there.