Self-taught · 2021 — 2022
Eleven weeks arguing with a sensor
I wanted a soil moisture probe that would text me when a bed dried
out. Simple project. It took eleven weeks and for eight of them the
readings were confident, stable and wrong.
The fault was a voltage divider I had built from a diagram I did not
understand. I found it by bisection in the end — halving the circuit,
testing, halving again — which is the same thing I had been taught to
do with a failed assay, just with a multimeter instead of a pipette.
Nobody paid me for this and nothing shipped. What it bought me is that
engineers only have to explain things to me once, and I can tell the
difference between a hard problem and an expensive one in a scoping
call.
8 of 11 weeks
debugging my own misunderstanding, which is the useful part.