How to trigger an alarm when toilet paper is low?
▻http://arduino.stackexchange.com/questions/564/how-to-trigger-an-alarm-when-toilet-paper-is-low
Anyone with kids knows they never help with the toilet paper. Anyone know how to track when it’s low or out and sound an audible alarm? I just don’t know what sensor to use that may help.
Some that came to mind are: by weight, by reflection (the color of the paper) or some laser tripwire - all right on the spool. I don’t mind building it, it’s just I don’t know which sensor. Anyone know which to use?
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