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Interesting idea to use an inductive sensor. I personally would have suggested a hall sensor (though that would involve fixing a tiny magnet to the pendulum) as
by em3rgent0rdr 3y ago
Interesting idea to use an inductive sensor. I personally would have suggested a hall sensor (though that would involve fixing a tiny magnet to the pendulum) as the cheapest solution. But of course there are many ways to solve the same problem. Neat project, thanks for sharing!
- joezydeco 3y agoMy mind went to an optical sensor. Either interrupt a beam with the pendulum or attach a small reflector to the arm.
- NikkiA 3y agoOptical 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.
- SomeoneFromCA 3y agoThe canonical way of using pendulums as time reference in electronic circuits, is to use magnetic pendulum coupled a special circuit (a bjt and an inductor) that would not only sense the pendulum but also reenergize it. example: https://electronics.stackexchange.com/questions/685779/electromagnetic-pendulum-pulse-driver-having-trouble-getting-circuit-running https://electronics.stackexchange.com/questions/685779/elect...
- wkjagt 3y agoOh cool I didn't know that existed. In my case I don't have to re-energize it because I use an existing mechanical clock.
- zokier 3y agoIf you are curious about this sort of thing, look up master pendulum clocks. They were precision clocks that provided electric timing pulses to network of slave clocks or other uses. Afaik they were common in mid-20th century
- totetsu 3y agoHere I was imagining you had to wind your computer with a key every morning.
- wkjagt 3y agoI also got a rotary encoder with the plan to use it with a wind up clock. So maybe one day!
- wkjagt 3y agoThanks! I liked the inductive sensor, because it meant I didn't have to change the physical clock in any way. And they were only like 5 CAD each.