I'm not certain why there is no adc conversion in the mux version. I'm working off of code that one of my previous classmates wrote for the project. I'm now trying to modify it for this new purpose. I do know that the multiplexer sends back three voltage signals, granted unmodified, because I can visualize them in the Arduino serial monitor and observe the corresponding changes I expect. The value doesn't matter to me. When I eventually analyze the data I'll determine the baseline and turn all values significantly different from the baseline into 1's and the rest into 0's. That will give me a rotation count from each running wheel. I suppose I should be asking the original code writer what the print out value should be (he didn't comment his code very much). Regardless, thank you! What thread would have been the appropriate one? I came here because I assumed the code that PLX reads would be my issue.