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Maker Pro

Rotation Switch

DanielW

Mar 12, 2014
1
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Mar 12, 2014
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Hey I was wondering if there is a type of switch that turns on when rotation slows down or a switch that turns on when rotation starts. Thanks
 
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KMoffett

Jan 21, 2009
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Jan 21, 2009
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Not a simple switch, but a tachometer followed by a missing pulse detector set to the desired minimum frequency/RPM. What rpm are you wanting to be the trigger point?

Ken
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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Nov 28, 2011
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Could this be done mechanically using centrifugal force?

Back before ECUs, car engines had a centrifugal system in the distributor, I think, to adjust the timing according to the engine speed. That's not what you want, but you might be able to use the idea. Maybe... :)
 

duke37

Jan 9, 2011
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Jan 9, 2011
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Do you mean 'slows down' or do you mean stop.
An analog output tachometer can have its signal differentiated to set a bistable on speed up and reset on slow down.
The rate of speed up and slow down will need to be defined.
 
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