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wirless speed measurment - looking for a sensor or circuit

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mtawab74

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wirlessspeed

Hi
I'm looking for a sensor or circuit that measure the speed without any wiring
for example

i want a device that's to be mounted on motor ROTOR and transimite the ROTOR SPEDD

the device will be Battery powered , also it shouldn't be connected or linked to the rotor or external world
it's just mounted on the rotot no other relation to the rotor other than mounting

thanks
 

mtawab74

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Re: wirless speed measurment

I'm replying my self to explain the requirment

could an optical reflector do this job???

how the optical mouse work
 

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