Reference
Last revision 2025/12/15
The article delves into the principle of AB two-phase pulse wave sensors, which utilize infrared reflective sensors with a phase difference to determine the direction of wheel rotation.
Principle
AB two-phase pulse wave,measured by two infrared reflective sensor.These two sensor pulse waveform is close to a phase difference of 90 degrees, through the AB two-phase lead and lag of the waveform judged wheel forward rotation or the reverse.
Other Supplementary Information
Note: Please short current R4 when working in 3.3V
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