I found this sensor from old collection(not mine). As far as I remember it is used for RPM count. But what kind of censor is this ? capacitive proximity sensor or inductive ? And how this work, I mean how can I use it for RPM count with an ardiuno ? It has 2 wire connection from backside.
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but will it work with something like that ? and how should I use it ?
I mean, how do I know how much voltage it require ? Can I use 5V as it will be easier read from arduino. And how do I wire this sensor, there has to be common ground ?
Generally passive magnetic type inductive speed pickups are used with some signal conditioning (usually comparator type op-amp) and wired to
a digital input as the information you want is the time lapse between pickup pulses which is RPM. The voltage is depends on the sensor. If the voltage is exceed 5V, for sure you can use a relay to make it work. If you can find the datasheet of this component, it will help you to design your circuit.