Sorry I couldn't make it last night - I would have liked to get some stepper driving tips, but my son was ill. Nevertheless, I can post my latest thoughts on the internal bin.

the image below shows the individual components. I plan to use gravity-fed liquid through two valve solenoids. This will either dispense coloured liquid onto canvas on top of the bin, or maybe onto the bin lid itself. The colours will represent alternative weeks of rubbish.
Liquid will be directed via a movable nozzle to indicate amount of rubbish for the week.

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