As a nice-to-have update, the Raspberry Pi fan controller got a user-interface, in the form of a tiny 3d-printed 2mm thick front panel (ball-point pen in photo for scale).
In pushes tightly over the protruding mounting threads of the two switches.
The annotations are 1mm deep pits filled with white marker pen – which got all over the place and seeped into the rough texture of the nominally black bits, hence the unattractive combination of black ball-point and felt-tip trying to cover the residual white.
Operations is, I hope, now self-explanatory.
Regrets?
Maybe the ‘off’ marker should be a ‘0’ rather than an ‘X’, and I sanded the front before the white was fully dry, greying it somewhat.
Fan controller construction and testing
Ps, currently in the second-fastest (‘…’) position, it is barely audible and running at between 42 and 46°C at the moment.
