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I want to measure the real time RPM of the wheels. I think incremental rotary encoder would be good. But i am confused on how to interface it with DC brushless geared motors. From the images i am not quite sure if only one rotary encoder would suffice or do i need any other sensor also with it?
I am doing my project on arduino uno.

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    $\begingroup$ This seems like pretty basic math. If you know the number of cycles per revolution of the encoder you just divide. Why would you need another sensor? $\endgroup$ – Octopus Mar 24 '15 at 17:36
  • $\begingroup$ @Octopus : In the image of rotary encoder, i couldn't see where the sensors are located, hence i was doubtful. Besides, i also couldn't find a video describing how to interface it with the wheels. $\endgroup$ – explorer Mar 25 '15 at 6:38
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    $\begingroup$ So is your question then, more about how to use the device? That sounds like a different question. More info about the device could help us to help you. $\endgroup$ – Octopus Mar 25 '15 at 17:08
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Different encoders will attach to the motor or shaft differently. Typically, the motor has a small shaft coming out the back of motor for this purpose. And you buy the motor with the encoder already installed.

Actually, now i see you asked about a brushless motor. Typically, these have added hall effect sensors by the manufacturer. Because you energize the 3 coils of the motor in a specific sequence to spin it, it is easy to use these hall effect sensors as an incremental encoder.

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