Question

I wanted to know how to write a code that takes data input from an a to d (analog to digital converter), stores this data that with a timescale of when the data is recieved. I need this data to be stored aswell. I have another code (already done) that does a Fourier Transform on this data, but i dont know how to link these together. and at the end i need these fourier to be plotted in a graph. THanks if you can give me any help