2. Please note that the boards operates at 3.3V (unlike most other Arduino boards, which use 5V); be careful when connecting external components. (Quoted from Arduino yet again). From details about the board, I don't see anything that says we can use a 5v (link)
3. Looking at some sample code I think it runs using PWM. This was just a test run of the blimp. I'll check the actual code once I load everything onto my laptop tonight.
Oh, and searching around the internet I found another 52" blimp that says it only takes 5 cubic feet of helium to make it go. I'll check with Air Gas and Praxair tomorrow, as well as Party City.
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