If you really want some good experience you could build the whole thing smaller with a standalone arduino. More parts for you to solder in, but in the end it's cheaper and smaller. The arduino board is not needed for the entire MPGuino; however it is needed to program the ATMega 328 chip. If you wanted I'm sure someone could program the chip for you and ship it to you. I put together a parts list for this as I'm going to be building one myself and I can build it all for about $20. That's less than just the arduino board alone.
Email me and I can put together a complete parts list and schematic for you.
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