A foot presence sensor system for an active article of footwear can include a sensor housing configured to be disposed at or in an insole of the article, and a controller circuit, disposed within the sensor housing, configured to trigger one or more automated functions of the footwear based on a foot presence indication. In an example, the sensor system includes a capacitive sensor configured to sense changes in a capacitance signal in response to proximity of a body. A dielectric member can be provided between the capacitive sensor and the body to enhance an output signal from the sensor.

A present invention provides a device capable of properly measuring the capacitance of a dielectric elastomer by variably manipulating the voltage applied to the dielectric elastomer. A capacitance estimating unit 22 acquires current detection values at a plurality of sampling times in a current reduction period in which, when an output voltage of a power source 10 changes, an energizing current of a dielectric elastomer 1 increases and then gradually decreases according to the change in the output voltage, and estimates the capacitance of the dielectric elastomer 1 on the basis of a model representing a correlation between the time-dependent change of the energizing current and the capacitance of the dielectric elastomer 1 in the current reduction period, and the current detection values.

A single plate capacitive bubble detection sensor. The detector may employ a single active plate. A parasitic capacitance of the active plate relative to the environment may be monitored without reference to any particular ground source. In this regard, highly sensitive measurements may be made of a tube disposed adjacent to the active plate to detect, for example, the presence of air, liquid, or a change between liquid and air in the tube.

One or more examples relate to a detector. A signal that the detector is configured to sense is a differential value. Such a differential value may be indicative of a difference in self-capacitance indications that are exhibited at first and second internal capacitors. Such a differential value may be proportional to a relationship between a first material and a second material present at a device-under-test coupled to electrodes of the detector. Such a differential value may be proportional to a vertical elevation of a surface of a material present at a device-under-test coupled to electrodes of the detector. A difference in coupling capacitances may be obtained by performing complimentary acquisition processes utilizing symmetric capacitive sensors. When the acquisition processes are performed substantially simultaneously, coupling error indications that may be present in the self-capacitance indications are not present in the differential value.

The present disclosure relates to a rotation sensing arrangement for an injection device. The rotation sensing arrangement includes a first member and a second member that are rotatable relative to each other with regard to an axis of rotation, at least one signal generator arranged on the first member, at least one sensor arranged on the second member, and a processor (240) connected to the at least one sensor. The at least one sensor includes an interdigital electrode structure configured to generate an electrical signal in response to a movement of the at least one signal generator relative to the sensor. The processor is operable to calculate an angle of rotation of the first member relative to the second member on the basis of the electrical signal.

A foot presence sensor system for an active article of footwear can include a sensor housing configured to be disposed at or in an insole of the article, and a controller circuit, disposed within the sensor housing, configured to trigger one or more automated functions of the footwear based on a foot presence indication. In an example, the sensor system includes a capacitive sensor, and the sensor is configured to sense changes in a foot proximity to the sensor in footwear. A baseline or reference condition for the capacitive sensor can be updated to accommodate different use conditions.

Embodiments are provided for intelligently activating an amplifier in a playback device based on proximity detection. The playback device may be in a quasi-idle state when the playback device is not rendering media content. The quasi-idle state of the playback device may involve an amplifier in the playback device being inactive, while some other components or modules of the playback devices remain active. The playback device may include a proximity sensor configured to detect movement relative to the playback device. If movement is detected indicating that a user input to cause the playback device to render media content is anticipated, the amplifier may be pre-emptively activated such that the playback device enters an active state from the quasi-idle state. In some cases, the playback device may send a message to one or more other playback devices to cause the other playback devices to enter an active state.

A supply tube assembly for measuring a liquid agricultural product application rate. An upstream portion of a supply tube has an upstream portion outlet end. A downstream portion has a downstream portion inlet end. The sensor body assembly includes a sensor body, a first sensing plate, and a second sensing plate. The sensor body has a sensor inlet end positioned to receive an inlet flow of the liquid agricultural product from the upstream portion and a sensor outlet end positioned to receive an outlet flow of the liquid agricultural product. The sensor body is an enclosure having a cross sectional area larger than the cross sectional area of the upstream portion of the supply tube and the downstream portion of the supply tube. Electronic components are configured to measure the liquid agricultural product application rate between the first sensing plate and the second sensing plate.

A supply tube assembly for measuring a liquid agricultural product application rate. An upstream portion of a supply tube has an upstream portion outlet end. A downstream portion has a downstream portion inlet end. The sensor body assembly includes a sensor body, a first sensing plate, and a second sensing plate. The sensor body has a sensor inlet end positioned to receive an inlet flow of the liquid agricultural product from the upstream portion and a sensor outlet end positioned to receive an outlet flow of the liquid agricultural product. The sensor body is an enclosure having a cross sectional area larger than the cross sectional area of the upstream portion of the supply tube and the downstream portion of the supply tube. Electronic components are configured to measure the liquid agricultural product application rate between the first sensing plate and the second sensing plate.

A sensor device for detecting at least one physical variable, comprising a housing, at least one sensor element arranged in the housing, at least one circuit board arranged in the housing and comprising a circuit arrangement, and at least one input device arranged on the housing for carrying out input operations which are processed in the circuit arrangement to influence the sensor properties, is characterised in that the input device, to realise a touch-sensitive effect, comprises an actuation area, which is arranged on a housing wall and is permeable to electric fields, and a capacitive area, which is arranged on the circuit board or is formed as part of the circuit board, and in that the circuit board is arranged in the housing such that the capacitive area lies directly below the actuation area.