In order to document the sensor apparatus for students to understand, I had planned to draw a schematic in Eagle. Last night, I ran across Fritzing, though, and thought I would give that a try. The results are edited a bit. Fritzing didn’t have a part for the magnetopots, so I drew one — hoping to create a part out of it. Unfortunately, when I tried to follow the part creation procedure, I found that the Fritzing part template file appeared to have slightly less that 1 mil hole spacing, so it wasn’t compatible with the part I drew. Bummer, but maybe it saved me some time in the end?