or to make it really clear: USB is a bus that has dedicated host ports. The Kindle does not have a host port. It thus can not drive USB devices, but is itself an USB device.
The Kindle therefore does not have a USB host stack. Thus it can't drive other USB devices on the software side of things, either.
Connecting to the serial port, however, sounds like a viable option. However, you need to program a device for that, it's not as easy as taking existent hardware and mod it so it suddenly is an input device for the Kindle.
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