I'm doing my master's thesis in QCM development for bio molecules detection. Its inspired by OpenQCM design (Thanks a lot for making your design and knowledge public).
I've a few questions to move forward with my design.
FreqCount documentation says it works on Arduino upto 8MHz. And for teensy around 60MHz. And in this forum I read somewher that OpenQCM uses undersampling to read up to 10MHz on Arduino Micro using FreqCount. But at which step is this undersampling done? Has OpenQCM modified FreqCount Library ? If so, where can I get that modified version of FreqCount?
What is the exact role of Quartz Crystal driver on Arduino Shield? Is it just converting frequency output of crystal to nice square shape wave with an Amplitude understandable by Arduino?