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RonNNN

In article , says...

How does my $10 counter-top electric can opener know to stop after the
can rotates 360 degrees and the lid is severed all around and sticking
to the spring-loaded magnetic arm?

I don't see any kind of sensor or probe and the rotation can't be
time-dependent because it works with different diameter cans.

So how?

The magnet is holding down the "run switch" until it (the lid) lifts from
the can.

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RonNNN