I want to make a system that always have the same current (about 1ma) in a water with silver electrode. At start it will be purified water so conductivity will be really low.
But with time silver particle will be released in water, raising his conductivity so if I don't lower the voltage the current will raise too (meaning that bigger particle will be released which I don't want too).
So, is there any way I can measure low current and adapt voltage with the result (since deducting resistance wouldn't be hard).
I know about ASC712 but It seem that he can't be precise enough (steps of 13ma max) to my use.
I precise it's not that long I'm trying to get back in electronics with arduino so many school things have been forgotten.