However the super simple HW is also one of the big downsides: there is a chance to damage the µC with a charged cap or maybe ESD.
The measured capacitance on MOSFETs might be high, because it is measured at low voltage. Data-sheet values are usually for a higher voltage.
Those are a few things I was referring to.
5V is the bare minimum.
Don't get me wrong btw, I am not saying it's crap, on the contrary.
I just don't see why 5V is "a key point".
That being said, I think it wouldn't be so difficult to lift this project to the next level.
With a few addons that means you can actually get very reliable results.
In my opinion the software is pretty decent in that side, but the HW could just use a few more bits.
That way you can easily come up with something that's being close or even equal to professional gear for just fraction of the price.
But maybe some people like to keep it simple and am I to ambitious?
I just see potential that's not fully being used.