Block diagram and some construction detail
Here is a block diagram of the rubbish monitor. At this stage I am working from the inside out...
Squirter will spurt salty water at bin lid, when water evaporates, a trace of salt remains:
Squirter sits on Spinner, which rotates it around bin lid - probably in a two-week arc which then "rewinds". The pattern will reveal rubbish usage day by day, but will be somewhat ambiguous, due to water/salt flow. Basically when the outside bin is full on a given day, more squirting happens, so more and "spreadier" salt.
Squirter will spurt salty water at bin lid, when water evaporates, a trace of salt remains:
Squirter sits on Spinner, which rotates it around bin lid - probably in a two-week arc which then "rewinds". The pattern will reveal rubbish usage day by day, but will be somewhat ambiguous, due to water/salt flow. Basically when the outside bin is full on a given day, more squirting happens, so more and "spreadier" salt.
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