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A comment on Show HN: Apple II clock using interrupts from physical pendulum clock. Parent comment

Re:Show HN: Apple II clock using interrupts from physical pe... by joezydeco on Sunday January 28, 2024 @12:52PM (#39168037)
My mind went to an optical sensor. Either interrupt a beam with the pendulum or attach a small reflector to the arm.
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Re:Show HN: Apple II clock using interrupts from physical pe... by NikkiA on Wednesday January 31, 2024 @06:03AM (#39202365)
Optical sensor would be the best option - both induction and hall effect will add a very tiny eddy current brake effect that will slow down the pendulum. Probably imperceptively, but it'll be there and will affect time keeping eventually.
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