LJ12A3-4-Z/BX NPN NO inductive proximity sensor


Hello!
newbie here, is the output of this sensor digital or analog? Has anyone here used this sensor for a tachometer project and can tell me what the maximum detection frequency is? some datasheets say 100hz others say 500hz for the same model. I would like to use it to measure speeds from 150-3000 rpm. Any help is appreciated and thank you all in advance!

have a look at linterfacing-inductive-proximity-sensor-lj12a3-4-z-bx-with-arduino
have you considered using a QEI encoder?

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thank you very much, have you got an idea about the frequency response? an qei encoder is a good idea although i think it's not suited for the project i'm doing ( car engine rpm counter) thanks again.

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