A sensor system for detecting water or air in a hollow member comprises a first acoustic sensor assembly in a first housing on one side of the hollow member, a second acoustic sensor assembly in a second housing on the opposite side, a controller unit connected to the first and/or second sensor assemblies, and where the first and second sensor assemblies and the controller unit are provided with power supply. Each of the first and second sensor assemblies comprises a set of probes connected to electronics for transmitting and receiving signals, and where the housings comprise fastening means for connecting the housings and the probes to the hollow member. The controller unit comprises a microcontroller, software for controlling and coordinating transmission and reception of signals between said probes, and means for registering and logging data generated by the sensor assemblies. A method detects water or air in a hollow member.

An office chair system has an office chair with adjustment elements for changing positions of elements of the office chair, a sensor element, a calculation unit coupled to the latter and to the adjustment elements, as well as an operating element coupled thereto. The adjustment elements are configured to detect contacts and actuations of components of the adjustment elements and to generate an adjustment signal based thereon. The sensor element is configured to determine the positions of the elements and a posture of a user and to generate a position signal based thereon. The calculation unit is configured to generate a first feedback signal based on the position signal, which contains information about a proposed change of the positions. One of the components is assigned to the proposed change. The calculation unit is configured to verify a contact or actuation of the assigned component and to generate a second feedback signal based thereon. The operating element is configured to output the first and second feedback signals.

A sensor system for detecting water or air in a hollow member comprises a first acoustic sensor assembly in a first housing on one side of the hollow member, a second acoustic sensor assembly in a second housing on the opposite side, a controller unit connected to the first and/or second sensor assemblies, and where the first and second sensor assemblies and the controller unit are provided with power supply. Each of the first and second sensor assemblies comprises a set of probes connected to electronics for transmitting and receiving signals, and where the housings comprise fastening means for connecting the housings and the probes to the hollow member. The controller unit comprises a microcontroller, software for controlling and coordinating transmission and reception of signals between said probes, and means for registering and logging data generated by the sensor assemblies. A method detects water or air in a hollow member.

Headgear includes one or more sensors that provide input information to a controller of the headgear. The sensors may include accelerometers, location sensors, wireless receivers, cameras, and so on. The controller may receive the input information that is indicative of an orientation of the headgear, a location of the headgear, a communication signal, and/or an image or video. The headgear may also include one or more output devices that may be controlled by the controller (e.g., actuators, electronic displays, lights, speakers, and/or communication interfaces). As such, the headgear may output instructions to actuate an actuator, display an image on an electronic display, activate a light, emit a sound using a speaker, and/or send a communication signal using a communication interface. In particular, the headgear may determine an instruction to send to an output device in response to receiving the input information, and send the instruction to the output device.

Headgear includes one or more sensors that provide input information to a controller of the headgear. The sensors may include accelerometers, location sensors, wireless receivers, cameras, and so on. The controller may receive the input information that is indicative of an orientation of the headgear, a location of the headgear, a communication signal, and/or an image or video. The headgear may also include one or more output devices that may be controlled by the controller (e.g., actuators, electronic displays, lights, speakers, and/or communication interfaces). As such, the headgear may output instructions to actuate an actuator, display an image on an electronic display, activate a light, emit a sound using a speaker, and/or send a communication signal using a communication interface. In particular, the headgear may determine an instruction to send to an output device in response to receiving the input information, and send the instruction to the output device.

Headgear includes one or more sensors that provide input information to a controller of the headgear. The sensors may include accelerometers, location sensors, wireless receivers, cameras, and so on. The controller may receive the input information that is indicative of an orientation of the headgear, a location of the headgear, a communication signal, and/or an image or video. The headgear may also include one or more output devices that may be controlled by the controller (e.g., actuators, electronic displays, lights, speakers, and/or communication interfaces). As such, the headgear may output instructions to actuate an actuator, display an image on an electronic display, activate a light, emit a sound using a speaker, and/or send a communication signal using a communication interface. In particular, the headgear may determine an instruction to send to an output device in response to receiving the input information, and send the instruction to the output device.