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The question that I am asked most often is ìhow do I start a USB project?î  There are many
alternate starting points for the design of a USB I/O device and this paper focuses on what I
consider the simplest, and in many ways the lowest cost, method of using a PC as an I/O device.
It is possible to use USB-to-parallel, USB-to serial or pre-built ìbyte-moverî products but I feel
that these solutions mask much of the flexibility and value of a USB solution.  The ìPC as an I/O
deviceî method presented here will expose many of the details of USB so that you may exploit
its capabilities.  This paper first covers some essential USB theory[1] and then presents a
solution using a low-cost adaptor[2] and a PC.  Several example solutions are presented to get
you going and all source code and schematics are downloadable for your experimentation.

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