CPC G08C 17/02 (2013.01) [G06F 1/325 (2013.01); G06F 1/3246 (2013.01); H01H 3/02 (2013.01); H05B 47/115 (2020.01); H05B 47/19 (2020.01); H01H 2300/03 (2013.01)] | 20 Claims |
1. A method of detecting rotation of a rotating portion of a control device, the method comprising:
receiving first and second sensor control signals from respective first and second magnetic sensing circuits, the first and second sensor control signals generated in response to magnetic fields produced by one or more magnetic elements connected to the rotating portion;
disabling the second magnetic sensing circuit when the rotating portion is not being rotated, wherein the control device is configured to operate in a sleep state when the rotating portion is not being rotated;
generating and pulse-width modulating an enable control signal to periodically enable and disable the first magnetic sensing circuit;
determining that a magnitude of the first sensor control signal has changed; and
causing the control device to operate in an active state upon determining that the magnitude of the first sensor control signal has changed.
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