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>“I accidentally invented a necklace that buzzes continuously unless you move your hand close to your face,” he said.

>“After scrapping that idea...

So instead of adding an inverter/NOT gate, he just gave up?

If there's a microcontroller on the project it could take the high voltage as OK and the drops as the "get your hands out of your face" signal. There's no need to put the buzzer right there, it could be in another output of that uC. But I think this article's great deal is: "Should boredom be considered as a people's health risk?" I think it does.

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