A magnetic roller device and a method for calculating rotation information thereof are disclosed. The magnetic roller device includes a multipole magnet, an MCU, plurality of Hall components, and a roller disposed on a handwriting device, wherein the multipole magnet is disposed on the roller, the multipole magnet includes at least one pair of magnetic poles with opposite polarities, and output ends of the plurality of Hall components are connected to an input end of the MCU; the plurality of Hall components are all located on a same plane of a magnetic field sensing space of the multipole magnet, and distances between each of the plurality of Hall components and the multipole magnet are equal; and a distance between two adjacent ones of the plurality of Hall components is less than half of a width of each magnetic pole in the multipole magnet.

The present disclosure relates to chopper amplifier circuits with inherent chopper ripple suppression. Example implementations can realize a doubly utilized chopper amplifier circuit that is a current-saving circuit with a wake-up function that is capable of providing a self-wake signal in order to change into a fast, low-jitter/low-latency mode, and to provide a wake-up signal for a sleeping microprocessor or a system in response to signal changes.

To reduce the influence of an unintended magnetic flux of a permanent magnet on detection accuracy. An absolute encoder (2) includes a magnet provided at a tip end side of any one of a first worm gear portion (11) and a second worm gear portion (22), and an angle sensor configured to detect a rotation angle of the magnet in response to a change in magnetic flux generated from the magnet. In the magnet, a first magnetic pole portion of a first polarity and a second magnetic pole portion of a second polarity different from the first polarity are formed adjacent to each other as viewed from an axial end surface of the magnet. The first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in a radial direction with a radial center of the magnet as a boundary, and the first magnetic pole portion and the second magnetic pole portion are formed adjacent to each other in an axial direction with an axial center as a boundary. The absolute encoder (2) is provided with a magnetic interference reduction member formed of a magnetic material on a radially outer peripheral surface of the magnet.

A system for detecting rotational over travel includes: an angular position sensor comprising a rotor rotatable about an axis, the angular position sensor configured to output one or more electrical signals to indicate an angular position of the rotor about the axis and/or a number of turns completed by the rotor about the axis; and a device comprising a first operating mode and a second operating mode and configured to transition from the first operating mode to the second operating mode in response to the rotor rotating beyond at least one angular position threshold, wherein the transition from the first operating mode to the second operating mode is independent of the one or more electrical signals.

A vehicle chassis sensor assembly for measuring the ride height of a vehicle which comprises a rotary arm member including an overmolded magnet encapsulated in the rotary arm member. In one embodiment, the overmolded magnet includes a layer of overmold material defining an open overmold window in the side and/or top exterior surfaces of the layer of overmold material. Another embodiment includes a pair of spaced magnets that are completely encapsulated in a two step molding process before being molded into a rotary arm member.

An electronic rotary encoder is configured to be disposed on a vertical rotary shaft in a rotary object to obtain two encoded signals: a phase A signal and a phase B signal for calculating a rotational speed and a position. The electronic rotary encoder includes: at least one Hall element outputting Hall signals used as a square wave of the phase A signal; two capacitors, to respectively obtain a first voltage and a second voltage; two buffer gates, to respectively output waveform signals of a first X voltage and a second X voltage; two comparators outputting, a control signal through a latch; and an exclusive OR gate, where a direction signal and the control signal outputted through the latch are inputted to the exclusive OR gate, to obtain the phase B signal.

The invention relates to an apparatus, in particular of a joystick, for detecting a tilt angle of a pivot lever (2, 2′), having a pivot lever (2, 2′) which can be tilted about a fulcrum (S) relative to a predefined axis (Z), having a magnetic device which is arranged on the pivot lever (2, 2′) and can be moved with the latter, and a sensor device (5) which is at a distance from the pivot lever (2, 2′) and is designed to detect a magnetic field, and having an evaluation device for determining the tilt angle on the basis of the detected magnetic field, wherein the magnetic device has at least one cylindrical permanent magnet (3, 3′) with uniaxial magnetization (4). The apparatus according to the invention is characterized in that the pivot lever (2, 2′) is held, with respect to its axis (Z), so that it can be translationally deflected in the direction of the sensor device (5), and the permanent magnet (3, 3′), on its end facing the sensor device (5), tapers radially cylindrically along the extent of a predefined axial end section. The invention also relates to a permanent magnet (3, 3′) for such an apparatus.

A ladder including sensors is provided. A remote computing device is also provided that communicates with the sensors to facilitate detection of various operating conditions. Methods for detection are also provided.

Methods and apparatus for a current sensor having an elongate current conductor having an input and an output and a longitudinal axis. First, second, third and fourth magnetic field sensing elements are coupled in a bridge configuration and positioned in a plane parallel to a surface of the current conductor such that the second and fourth magnetic field sensing elements comprise inner elements and the first and third magnetic field sensing elements comprise outer elements. Embodiments of the sensor reduce the effects of stray fields on the sensor.

A ladder including sensors is provided. A remote computing device is also provided that communicates with the sensors to facilitate detection of various operating conditions. Methods for detection are also provided.