THis week I made a series of boards that
Update: Not only are these meters incredibly difficult to find, and I'm not completely sure I understand what I am reading when I am reading spec. sheets on multiple sensors, but they are all quite expensive (some more than others).
It is far too complicated to make my own; I wish there was a more miniturized, and affordable version of these sensors.
I will need to rethink my inputs for my final project. There is no way I can afford to make a NPKCa meter for every reservoir in the room.
