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1) Which Arduino board is the best fit? 2) Is it an option to use Chinese boards for the sake of cost optimization? 3) Do I need separate RS232 and USB shield or it's ok to leverage built in USB and data pins? When communicating with Android you need to make sure that there is software available for doing the communication. That's really down to the ...


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First, read a bit about USB, it is an entire protocol, not just a hardware/pin based interface. It is actually quite involved. Then it will be clearer to you why a USB (from the Nano) solution will be... difficult. Based on my understanding, I would use your #2 idea and what has been suggested, and do the following... Setup the Uno as a USB slave, not a ...


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