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Hello I have an Arduino Uno and I salvaged a USB port from an old computer. The USB port has 4 pins on it and it accepts USB sticks. I was wondering if it is possible to connect it to my Arduino so my Arduino can load data from files on the USB. I don't want to go out and buy a shield but I don't mind using libraries. Is it possible to read and write data from a USB stick with Arduino?

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    Usb OTG mass storage library. Good luck – cde Jul 17 '16 at 13:37
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    Requires an USB Host Shield. The UNO can only work as device otherwise. Talking to a stick requires host role. – Turbo J Jul 17 '16 at 14:58
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The Uno does not have any USB host or OTG capabilities on its own, and bit banging it is not easy. A USB Host shield, or a better microcontroller is needed.

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