Further ideas on bins

Further to yesterday's discussion on bins, I have refined the problem I am seeking to solve: rather than having to change the bin per se, it is changing it when overfull that creates the real issue. And the solution: a sensor (and alarm) that tells you to empty the bin when its getting too full (solar powered of course). This way may lazy housemates would be forced to change it. Perhaps it could even lock when full to prevent over filling.

I think I've got carried away. It's only a bin after all.

Another spin-off idea: the lid of the bin should say "Can it be recycled?" or when the bin lid is opened then a voice recording says the same thing (solar powered of course). This would encourage people to recycle (or in the case of an annoying little voice - go insane).