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Amazon.com: ARCELI USB Host Shield for Arduino USB Shield UNO MEGA 2560 Support with Google Android ADK USB HUB : Electronics
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Serial OTG. Arduino CH340. FTDI. rkl099's Extension - Tutorials and Guides - MIT App Inventor Community
Is there a reason for the odd choices of the type of USB connector used on the Arduino Uno and Nano? Why didn't they just use Micro USB? - Quora
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