Patent ID: 11880506
Assignee: SENSEL, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 3:
4. The keyboard system of claim 1, wherein the controller is configured to:
read electrical values from the array of inductors by tracking voltage across the array of inductors;
detect the first change in electrical value comprising a first voltage of a first polarity across the first inductor at the first time;
register the first keystroke of the first key type in response to detecting the first voltage of the first polarity across the first inductor;
drive the oscillating voltage across the first inductor during the first haptic feedback cycle in response to registering the first keystroke;
detect a second voltage of a second polarity, opposite the first polarity, across the first inductor at a second time succeeding the first time;
register release of the first keystroke from the first key location on the tactile layer in response to detecting the second voltage at the second polarity across the first inductor; and
drive a second oscillating voltage across the first inductor during a second haptic feedback cycle in response to registering release of the first keystroke from the first key location.