Hi!
Great project. I also happen to have the Olimex ADC and the Waveshare screen, so would like to directly replicate exactly what you have. My grander plan is to send data back over USB to a Web interface too.
Is your project available on GitHub or similar?
Also, looking at the hardware for the Olimex ADC, it seems to have a bizarre “front end” which limits the type of signal it can capture. How did you account for that in your posted demo?
Thanks