This project is for connecting two 8051 based boards to one pc through USB. They are working fine separately. The included interface software can communicate with only one device at a time. It is in C++ and I have all of the source codes and documents. I just need a programmer to modify the interface to read from both in one application, and make a simple calculation on readings. More detailed information will be provided for the best quote/time.
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I have done something similar with a cypress board. So, it should be straightforward in your case (most likely I would use COM libraries in C++). Good luck!