An illustrative humidity sensor may include a substrate and a sensing field effect transistor. The sensing field effect transistor may comprise a source formed on the substrate, a drain formed on the substrate, a gate, and a piezoelectric layer disposed over the gate. Another illustrative humidity sensor may comprise a substrate, a semi-conductor layer disposed over the substrate, a piezoelectric layer disposed over the semi-conductor layer, a first electrode disposed on the piezoelectric layer, and a second electrode disposed on the piezoelectric layer. In some instances, the piezoelectric layer may comprise aluminum nitride.

A device for detecting a state of a diaper includes a sensor unit with a conducting unit including at least two electrodes. The electrodes are configured to detect electrical parameters of their environment. A coupling portion is disposed on at least one end side of the conducting unit and is connectable to a measuring device. The conducting unit is attached to a carrier layer. The measuring device comprises an input portion being connectable to the sensor unit, and a processor configured to receive signals corresponding to values of the electrical parameters detected by the sensor unit and to process said signals. A power control means is configured to control electrical power supplied from a power supply, and a determination means is configured to determine whether a state of a diaper has changed. A transmitting means is configured to transmit information regarding the determined state change to a receiving means.

A flexible sensing panel includes a flexible substrate having first and second major surfaces, first and second separated side edges, and first and second ends, the flexible substrate being at least partly disposed between a flexible protective layer and a flexible fastening layer, and at least one sensing element being disposed on the flexible substrate. The protective layer is secured to the first major surface of the flexible substrate and is folded over the first and second side edges onto the second major surface of the flexible substrate and secured thereto to position at least part of the first and second side edges within the so formed folds, and wherein the fastening layer is at least partly disposed on the second major surface of the flexible substrate and secured thereto.

A moisture detection element includes: an insulating substrate of an insulating material; an application part which is formed on the insulating substrate and to which a voltage is applied; an output part which is formed on the insulating substrate and configured to output a voltage signal corresponding in response to a current flowing through an electric path via water molecules adhering to a surface of the insulating substrate under the voltage applied to the application part; and a conductive film which is electrically insulated from the application part and the output part and is provided on the insulating substrate. An insulating film of an insulating material is provided on the application part, the output part, and the conductive film.

A sensor system in a package, comprising: a package, the package including: a sensor chip comprising sensor array comprising a plurality of sensing elements, wherein each of the plurality of sensing elements are functionalized with a deposited mixture consisting of hybrid nanostructures and a molecular formulation specifically targeting at least one of a plurality of gases, and wherein each of the plurality of sensing elements comprises a resistance and a capacitance, and wherein at least one resistance and capacitance are altered when the interacting with gaseous chemical compounds; and a mixed signal System on a Chip (SoC), comprising an analog signal conditioning and Analog-to-Digital conversion circuit configured to convert the analog signal into a digital signal, and a low-power processor circuit configured to processes the digital signal using a pattern recognition system implementing gas detection and measurement algorithms.

A method comprises receiving moisture sensor data from at least one moisture sensor located in a device. The at least one moisture sensor is configured to detect moisture on a surface of the device. The method also comprises determining a likelihood of the device slipping from a grip of a user based on the received moisture sensor data; and altering a surface profile of a surface panel of the device based on the determined likelihood of the device slipping from the grip of the user.

A humidity sensor device includes a substrate and a pair of interdigitated electrodes formed over the substrate.

A composite sensor including a temperature sensor unit that has a temperature-sensitive member and a humidity sensor unit including a moisture-sensitive member. The composite sensor further includes a first terminal used for the temperature sensor unit and the humidity sensor unit; a second terminal disposed to measure an electrical characteristic of the temperature-sensitive member with the first terminal; and a third terminal disposed to measure an electrical characteristic of the moisture-sensitive member with the first terminal.

Sensor accuracy issues may arise when a humidity sensor is kept in a high humidity environment for an extended period of time. In these circumstances, a humidity sensor reading may tend to may become less accurate over time. To improve the accuracy of sensor readings, methods and systems described herein estimate and correct for sensor drift in high humidity conditions. Methods and systems described herein may use memory to store past humidity or other sensor readings so that an estimated amount of sensor drift may be determined to improve the accuracy of sensor readings. A memory may be embedded in a sensor module so that past readings for a given sensor module are stored in the memory of the sensor module. Algorithms for sensor drift compensation, and systems and methods that use such algorithms to improve the accuracy of sensor readings, are disclosed herein.

A method of manufacturing a composite material, comprising providing a conductive polymer having a hydrophilic end and adding a metal oxide, such that the metal oxide is connected to the hydrophilic end of the conductive polymer, wherein the metal oxide is obtained by subjecting a metal oxide precursor to a dehydration reaction, a polymerization reaction, a condensation reaction, or a combination thereof.