Easiest/cheapest way to read 64 analog inputs of 30-70mV

[bennis]

Looking to read 64 d.c. analog inputs which are constantly active (20-70mV---0.02-0.07V absolute referenced to ground around 200Hz) and provide stimulation voltage(100-200mV) back to these inputs. I am also looking to read each input and display it on individual x-y graph plots that continually update. I was wondering if this would be feasible on a pi and ,if not, I would be fine with using the pi as a middle man between the analog signals and a PC.

So far I am thinking about using non inverting op amps to multiplexers to an ADC. Would this be the best way about to go about amplification of the signals? I also do not know how to go about stimulation.

Any help would be greatly appreciated.

[mikronauts]

This is a duplicate post of your previous posts:

viewtopic.php?f=37&t=94677&p=659349#p659349
viewtopic.php?f=37&t=114560&p=782704#p782704

I, and many others, have already tried to help you - but you ignore key questions asked of you, presumably in an attempt to preserve confidentiality about your project.

This suggests that you are trying to get free engineering support for something you hope to market as a commercial product.

Given that you made your original post December 2014, you have not been able to make it work.

From your posts, the best advice I can give you is hire a consultant to do the design work and testing for you.

Don't mis-understand - I am sure everyone wishes you success with your project, however those knowledgeable enough to design a solution are unlikely to do so for free for a commercial project, as it would take too much time to describe the solution in sufficient detail, not to mention testing the solution.

Looking to read 64 d.c. analog inputs which are constantly active (20-70mV---0.02-0.07V absolute referenced to ground around 200Hz) and provide stimulation voltage(100-200mV) back to these inputs. I am also looking to read each input and display it on individual x-y graph plots that continually update. I was wondering if this would be feasible on a pi and ,if not, I would be fine with using the pi as a middle man between the analog signals and a PC.

So far I am thinking about using non inverting op amps to multiplexers to an ADC. Would this be the best way about to go about amplification of the signals? I also do not know how to go about stimulation.

Any help would be greatly appreciated.