Syryia Considering the size, it's not suitable for using off-the-shelf photoelectric encoders. Furthermore, the Flexradio encoder has a switch, so currently, we can only use this one. In the future, we might be able to use magnetic encoders or other suitable solutions, but that would require us to fabricate the rotating shaft, which is a bit more complex for me at the moment. Also, the cost of off-the-shelf photoelectric encoders is too high; the combined cost of other components may even exceed the cost of the encoder itself.