A key structure including a circuit board, a membrane, a positioning frame, a sensor module, a scissor leg, and a key cap is provided. The membrane is disposed on the circuit board and is electrically connected to each other. The positioning frame is disposed on the membrane. The sensor module is disposed on the membrane and is electrically connected to the circuit board. The scissor leg is connected to the positioning frame and is adapted to move up and down relative to the positioning frame. The key cap is detachably disposed at the scissor leg and is spaced with positioning frame. The key cap has a reflective plane and a shaft component. The reflective plane faces the membrane. The shaft component is extended from the reflective plane and penetrates through the scissor leg and the positioning frame to abut the membrane. The sensor module is aligned with the reflective plane.

A sensor (10) is provided for detecting an object (20) in a monitored zone (18), having at least one sensor element (36) for detecting a sensor signal; having a switch output (30) for outputting a binary object determination signal; and having an evaluation unit (28) that is configured to generate the object determination signal from the sensor signal in dependence on the detected object (20) and to determine, in a teaching phase, a switching point that determines the association between the sensor signal and the object determination signal. The evaluation unit (28) is further configured to detect a respective sensor signal for a plurality of detection situations in the teaching phase, with the associated object determination signal being predefined for the respective detection situation and with the switching point being derived therefrom.

A sensor (10) is provided for detecting an object (20) in a monitored zone (18), having at least one sensor element (36) for detecting a sensor signal; having a switch output (30) for outputting a binary object determination signal; and having an evaluation unit (28) that is configured to generate the object determination signal from the sensor signal in dependence on the detected object (20) and to determine, in a teaching phase, a switching point that determines the association between the sensor signal and the object determination signal. The evaluation unit (28) is further configured to detect a respective sensor signal for a plurality of detection situations in the teaching phase, with the associated object determination signal being predefined for the respective detection situation and with the switching point being derived therefrom.

A no-contact switch is provided that is configured to change the state of a power converter in a photovoltaic system. The no-contact switch has a mechanical section that is movable from a first position to a second position and which may include a rotary dial or a sliding tab. The mechanical section may be mounted to and penetrate an enclosure. Each of the first and second positions may please a different area of the tab or dial in proximity to a sensor. The sensor may be placed in an interior of the enclosure, and may be configured to sense the change of position of the mechanical section. A controller may be configured to read the signal that the sensor outputs and, according to the signal, determine an electrical state of the power converter and/or change the state.

Various embodiments disclosed herein relate to a system and method whereby a haptic feedback mechanism may be integrated into a rotatable gear module such that rotating the module may generate pure mechanical haptic feedback. The gear module may be integrated into a wearable device, such as headphones, such that a set of magnets incorporated within may be aligned and misaligned with a plurality of teeth when the gear module rotates. In response to the rotation, each alignment and misalignment of the set of magnets with the plurality of teeth may generate pure haptic feedback. In embodiments, the gear module may be rotated to increment or decrement a unit of measurement associated with the headphones. Each unit of increment or decrement of change may produce haptic feedback based on the alignment and misalignment of the set of magnets.