I need to read a total of 64 analog voltages for a project I'm working on. This is a learning project and I'm starting from scratch, so I'm a bit lost.
I've considered a 64-channel analog to digital converter. However, those seem to be out of my price range (>$100), and I'm not sure how to scale up from more basic converters that it's easier to find tutorials for. I could use several of those more basic converters in combination with port expanders, but I suspect there's a better solution than "just add more X" that I don't know of yet.
I've looked into using a microcontroller to process the data and then send the Pi the results, but after reading several "how to choose a microcontroller" articles I think that might be overkill - though it seems like it would be cheaper and less electrically complex than the system I described above, so maybe not.
Could someone with more experience please point me in the right direction?
Edit to add requested information: Sampling rate need be no more than 10 Hz, with a resolution of 100 mV within a range of 0-5V. Readings do not need to be synchronous.