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This tag should be used for questions regarding the selection of components, deciding functionality, and other issues that may come up during the early stages of a project.

7 votes

How to trigger an alarm when toilet paper is low?

I think 'Arluin' and 'jmathew' have the right idea. Use a lever resting on the top of the roll. I would do it slightly different however. Rather than rely on contacts shutting you can use a potentiom …
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