497 results about "Capacitance transducer" patented technology

The invention provides an abnormal blood sampling inspection data evaluation processing method and system of a blood sampling system. Wherein the diffusion track dynamic state of an anticoagulant-blood contact surface in a blood sampling tube is tracked in real time, dielectric response waveform distortion characteristics on the two sides are synchronously collected through a capacitance sensor array, and diffusion form parameters are generated; curvature sudden change is analyzed to trigger an acoustic fluid device to modulate audio frequency and flow velocity, and a composite disturbance field is formed; performing capacitance axial scanning on the disturbed mixed fluid, extracting phase angle offset and gradient abrupt change point coordinates, and constructing a dielectric anomaly three-dimensional map; matching a standard dielectric model, positioning a coordinate set of a concentration gradient imbalance area and a coordinate set of an eddy current attenuation area, and generating an anticoagulant abnormal index and a mixed defect matrix in combination with phase angle offset difference; and establishing a data anomaly degree evaluation function based on the anomaly index and the defect matrix, dynamically associating a clinical error threshold, and outputting a test evaluation result. According to the invention, anticoagulant diffusion can be monitored in real time, and the mixing quality error can be accurately evaluated.

The invention discloses a vehicle exterior handle waterproof false triggering system and method based on double-frequency-point charging and discharging resonance, and relates to the technical field of automotive electronics. An electrode array composed of capacitance detection electrodes is arranged on the inner side of a vehicle exterior handle to form a vehicle exterior handle capacitance sensor; in a non-interference environment, high-frequency and low-frequency mutual capacitance reference values are collected, and a compensation parameter library is established by associating outer handle shell parameters of the vehicle; a self-capacitance channel of the electrode array is used for detecting proximity signals, high-frequency and low-frequency mutual capacitance signals are collected, and the high-frequency and low-frequency mutual capacitance signals are preprocessed; calling a compensation parameter library to correct the preprocessed high and low frequency mutual capacitance signal, and calculating the mutual capacitance increment and change slope of the high and low frequency mutual capacitance signal; based on the mutual capacitance increment and the change slope, human body touch and water interference are distinguished by analyzing high-frequency and low-frequency signals.

The invention relates to the technical field of intelligent robots, and discloses an automobile cabin intelligent robot arm device which comprises a multi-axis robot arm, a controller, an in-automobile space sensing device and an intelligent interaction device, and the multi-axis robot arm, the controller, the in-automobile space sensing device and the intelligent interaction device are all installed in an automobile cabin. The robot arm comprises a base rotating motor, an arm motor, a palm motor, a capacitance sensor, a pressure sensor, a USB / Type-C interface, a wireless charging interface, a magnetic attraction interface and the like. The in-vehicle space sensing device comprises a camera, a millimeter wave radar and the like. According to the intelligent robot arm device of the automobile cabin, the intelligent robot arm is controlled through voice or keys and the like, and the robot arm replaces personnel to complete object taking operation at a long distance or a view blind area position; distraction caused by the fact that a driver takes objects towards the back row can be avoided, and driving safety is improved. Meanwhile, the intelligent robot arm is controlled through voice or keys and the like, and the robot arm replaces personnel to complete service operations such as article storage, article fixing, games and caring; and the intelligent experience of the cabin is improved.

The invention provides an MEMS (Micro Electro Mechanical System) micromirror array chip, a module and optical scanning equipment. The MEMS micromirror array chip comprises a plurality of micromirror structures, a substrate, a vertical lead structure and a capacitance angle sensing structure, according to the micro-mirror array chip integrated with the capacitive sensor, array-level real-time angle detection, feedback control and high-precision scanning angle detection are realized, and the micro-mirror array chip is fast in driving and resistant to interference; meanwhile, the wiring density is reduced by frequency division multiplexing isolation signals; in addition, the application of a monolithic integrated capacitance angle sensor in a high-density micro-mirror array chip is realized by a thick substrate with a silicon through hole; and finally, the micromirror array chip of the monolithic integrated capacitance angle sensor is used for precision optical scanning equipment, a photoelectric angle detector is omitted, optical scanning high-precision real-time angle detection and feedback control, high-precision angle detection and high-speed scanning are realized, the use design is convenient, and the cost is low.

The invention discloses a wafer carrier size laser measurement device, and relates to the technical field of laser measurement, the wafer carrier size laser measurement device comprises a measurement platform mechanism, the measurement platform mechanism comprises a mounting table, the front surface of the mounting table is provided with a control terminal, and the top of the inner cavity of the mounting table is fixedly connected with a mounting rack; and the surface of the mounting frame is fixedly connected with a first motor. According to the invention, through the arrangement of the horizontally distributed self-adaptive nodes, flexible deployment is realized by utilizing a magnetic attraction structure, and the electric telescopic rod and the silica gel contact head are matched, so that complex curved surfaces such as a three-dimensional buckle and a deep groove of a carrier can be attached in a self-adaptive manner; a vertical plane and a concave structure which are difficult to detect by a traditional device can be subjected to multi-angle scanning, a measurement blind area is thoroughly eliminated, the coverage rate of three-dimensional size detection is remarkably increased, meanwhile, a temperature and vibration compensation model is built in an intelligent compensation algorithm module integrated by a control terminal, and the influence of environmental factors on a measurement result is corrected in real time.

A system including a plurality of first wires and a plurality of second wires is disclosed. Each second wire overlaps over one or more first wires at a respective overlapping area of one or more first wires. A dielectric material is disposed in a vertical gap at each respective overlapping area forming a capacitance sensor including a first electrode corresponding to a first wire and a second electrode corresponding to a second wire. The first and second electrodes are connected to a positive bias and a negative bias of at least one voltage source, respectively. The system includes at least one processor configured to periodically measure change in respective electric field of each capacitance sensor of a subset of capacitance sensors of a plurality of capacitance sensors, and store data corresponding to periodically measured change in the respective electric field of each capacitance sensor of the subset of capacitance sensors.

The embodiment of the invention belongs to the household appliance technology, and provides a clothes dryer and a drying control method thereof, and the clothes dryer comprises a box body, a barrel body, a motor, a compressor, a fan, a resistance sensor, a capacitance sensor and a processor; the processor is configured to execute a first drying task, and the first drying task is configured to control the compressor to operate at a first frequency, the fan to operate and the motor to operate; when executing the first drying task, the processor is further configured to control the running duration of the first drying task; when the humidity value is smaller than the first threshold value and the air moisture content is smaller than a second threshold value, a second drying task is executed; the second drying task is configured to control the compressor to operate at a second frequency, the fan to operate and the motor to operate continuously; and when the processor executes the second drying task, the processor is further configured to control the running duration of executing the second drying task. The method and the device can improve the clothes dryness judgment precision, improve the clothes drying quality and reduce the drying energy loss.

The invention belongs to the technical field of machine learning and robot grabbing, and provides a grabbing control method based on pre-recognition. Before grabbing operation is executed, sensing data obtained when a clamping jaw does not make contact with an object is collected based on a capacitive sensor and input into a pre-trained machine learning model, the category of the object to be grabbed is recognized, and grabbing target force is obtained through the recognized object category according to the mapping relation between the object category and grabbing force; and in the grabbing stage, based on the contact force collected by the capacitive sensor, optimization control is conducted on the opening amount of the clamping jaw, and the clamping jaw clamps the object with the grabbing target force. According to the invention, before a clamping behavior occurs, additional tactile information and supplementary information modes, different from visual information of a camera, of a clamped object can be provided, and the force application range of the clamping jaw can be expanded through the sensor, so that a clamping task can be better executed.

An aerosol supply device for receiving an article comprising a first section and a second section. The aerosol supply device includes: a receiving portion configured to receive at least a portion of an article; a capacitance sensor configured to measure a capacitance on a portion of the aerosol supply device receiving the article; and a processor communicatively coupled to the capacitive sensor, the processor configured to determine whether the article has been inserted or removed based on the capacitance measured over a period of time. During insertion and / or removal of the article: when the first segment is adjacent to the capacitive sensor, the capacitive sensor measures a first capacitance value; when the second segment is adjacent to the capacitive sensor, the capacitive sensor measures a second capacitance value, the second capacitance value being different from the first capacitance value, and the processor is configured to determine, using the first capacitance value and the second capacitance value, that the article has been inserted into or removed from the receiving portion.

A flush valve assembly for an automatic sanitaryware assembly, comprising a flush valve; a status sensor; a presence sensor associated with a presence sensor lens; an antenna associated with an antenna lens; a manual override actuator; and a controller. A status sensor may comprise an ultrasonic sensor or a capacitive sensor and is configured to be affixed to a sanitaryware assembly. The status sensor is configured to communicate with the controller, the controller is configured to determine a sanitaryware status, and the antenna is configured to transmit the sanitaryware status to a network gateway.

The invention relates to the technical field of flexible electronic sensors, in particular to a large-strain interdigital capacitive sensor based on liquid metal conductive paste, which comprises a flexible substrate, and the flexible substrate comprises a bottom packaging layer and a top packaging layer integrally connected to the upper surface of the bottom packaging layer. A liquid metal interdigital electrode is embedded between the bottom packaging layer and the top packaging layer, the liquid metal interdigital electrode is formed after liquid metal conductive paste is subjected to laser ablation patterning, the end of the liquid metal interdigital electrode is connected with a flexible wire, and one end of the flexible wire extends to the outside of the flexible substrate; the liquid metal conductive slurry is paste conductive slurry which is rich in oxide and is formed by mechanically stirring and oxidizing liquid metal; the liquid metal is gallium-based liquid metal; the problems that an existing flexible strain sensor cannot meet the large strain measurement requirement and is poor in stability and complex in preparation process are solved.

The invention belongs to the technical field of wind-powder concentration measurement of high-concentration pulverized coal, and discloses a wind-powder online measurement system suitable for high-concentration pulverized coal. According to the invention, a capacitance method and sound wave method double-channel pulverized coal concentration measurement mode is set, abnormal condition identification and comprehensive pulverized coal concentration output are carried out based on measurement results, and errors of a single method are avoided through mutual verification of the two methods and comparison of deviation identification anomalies based on the measurement results; the advantages of the two methods are combined, the measurement precision is improved, and the anti-interference capability and long-term operation stability of the system are enhanced. A device surface hanging material dynamic cleaning mechanism is set, the surface hanging material thickness of a capacitive sensor and an ultrasonic detection device is monitored in real time through a CCD imaging device, and cleaning operation is dynamically executed with the average hanging material thickness and the proportion of the number of monitoring points exceeding the threshold value as trigger conditions. Measurement errors can be reduced, long-term stable operation of equipment is guaranteed, and system reliability is improved.

An apparatus for use at an inventory location stowing items comprises an array of sensor elements. Each sensor element comprises a plurality of conductive elements that are driven as a self-capacitance sensor. Based on changes in capacitance values, interactions between a lane and user may be determined. The conductive elements may be selectively addressed to provide various physical resolutions and operational configurations. Some geometries of conductive elements provide information about position of an interaction along a long axis of the lane, as well as presence of items in the lane. The sensor element may include three conductors, stacked atop one another and separated by an insulator. To compensate for temperature and other effects, these the outermost conductors are grounded, and innermost conductor is driven. The array may be implemented on a rigid or flexible substrate. The array operates reliably in the presence of water condensation or small spills.

An environmental detection device including a housing, a capacitance detection circuit comprising a capacitor within the housing, and a chamber within the housing. The chamber including an air inlet to allow air to pass through the housing into the chamber and an environmental sensor to detect an environmental characteristic. The device including a first mesh structure at least partially covering the air inlet of the chamber, a first metallic conductor comprising at least a first portion of the first mesh structure, a second metallic conductor separated from the first metallic conductor by at least one dielectric material, a first electrical connection from the first metallic conductor to the relaxation oscillator circuit, and a second electrical connection from the second metallic conductor to a ground, wherein the first metallic conductor and the second metallic conductor form the capacitor of the relaxation oscillator circuit.

The invention relates to a pneumatic membrane structure fluid-structure interaction multi-physics field synchronous test method, which relates to the technical field of vibration measurement, and comprises the following steps: conformally embedding a flexible capacitive sensor array in the surface of a pneumatic membrane structure, detecting mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement through capacitance value change (electrical characteristics), and measuring the displacement of the flexible capacitive sensor array; and the capacitance value change rate delta C / C and the displacement delta x are in a linear proportional relationship. According to the pneumatic membrane structure fluid-solid coupling multi-physics field synchronous test method, a flexible capacitive sensor array is conformally embedded in the surface of a pneumatic membrane structure, and mechanical vibration, ultrasonic wave, sound wave or infrasonic wave displacement is directly detected by using capacitance value changes; wherein the linear proportional relation between the capacitance value change rate delta C / C and the displacement delta x is directly determined by the electrode distance and the dielectric constant of the capacitive sensor, so that the physical directness of vibration wave measurement is realized, the error caused by indirect calculation depending on a traditional strain gauge or an optical method is avoided, and the vibration wave displacement measurement precision is remarkably improved to + / -0.5% full scale.

This invention is entitled "Continuous Touch Input on Multiple Independent Surfaces." A touch input device is provided with the ability to sense capacitive loads in a two-dimensional array while also being able to sense deflection or movement of the input device at multiple different locations beneath the input plate. The touch input device can be advantageously used in a remote control device and can be used with multiple input buttons or platforms that overlay multiple capacitive touch input areas on a capacitive touch sensor substrate. Movement and positioning of the capacitive loads can be tracked and calculated through output signals from a set of electrodes or other capacitive sensors that have irregular shapes, inconsistent distances from the capacitive loads, and are positioned beneath variable materials and material compositions. Thus, track gestures and taps can be detected using the capacitive sensing device and deflection inputs can be detected using switches or other actuators positioned beneath the capacitive sensing device.

The invention relates to the technical field of railway signal processing, and discloses a track circuit compensation capacitor fault prediction method and system. The method comprises the following steps: acquiring real-time impedance spectroscopy data by using a distributed capacitive sensor network; performing multi-scale wavelet decomposition on the data, and extracting frequency domain energy distribution and transient abnormal fluctuation characteristics; constructing a dynamic Bayesian network model, and updating hidden state node posterior probability distribution through a variational inference algorithm; generating a fault risk index sequence based on a posterior probability, and designing an adaptive threshold adjustment strategy by using a reinforcement learning framework; constructing a mixed integer dynamic programming model to output fault early warning grade data; and constructing a multi-stage decision tree which comprises a feature screening layer, a pattern matching layer and a verification feedback layer. The method and the system can accurately predict the track circuit compensation capacitor fault in real time, improve the fault prediction accuracy and the system adaptability, reduce the false alarm rate, and provide reliable basis for railway operation and maintenance.

The invention discloses a dynamic liquid level detection system and method based on a capacitance-photoelectric dual-mode sensor, and the system comprises a dual-mode sensor module which comprises a capacitance sensor used for measuring the capacitance value change caused by the liquid level change; the photoelectric sensor is used for measuring the light intensity change caused by the liquid level change; the signal processing module is used for processing original signals of the capacitive sensor and the photoelectric sensor; the dynamic calibration module comprises a temperature sensor and a microcontroller MCU, and the microcontroller MCU is configured to receive and process the signal from the signal processing module; dynamically adjusting the excitation frequency of the capacitive sensor according to the temperature value read by the temperature sensor and a preset sample viscosity type; based on a self-adaptive weighted fusion algorithm, fusing the processed capacitance signal and the photoelectric signal, and outputting final liquid level information; and when bubbles are detected, the control system is switched to a pure capacitance detection mode. According to the invention, high-precision liquid level detection can be realized.

The invention relates to the field of horizontal well logging of high petroleum and natural gas engineering, in particular to a horizontal well output profile imaging logging instrument. The horizontal well output profile imaging logging instrument comprises a shell and supporting structures in groups, the supporting structures are evenly arranged on the shell in the circumferential direction, a detection assembly is arranged on each supporting structure, and each detection assembly comprises a capacitance sensor and / or an electrode sensor. The same sensors on all the supporting structures are arranged in the casing pipe in an annular array coaxial with the casing pipe to form a circular imaging face, equal-diameter imaging is conducted on the circular imaging face, the logging instrument further comprises a data processing module connected with the sensors and a power module used for supplying power, and the testing accuracy is improved.

The application discloses a dual-frequency charging and discharging resonance-based waterproof false triggering system and method for an outside handle of a vehicle, and relates to the technical field of automobile electronics.The electrode array formed by the capacitor detection electrode is arranged on the inner side of the outside handle of the vehicle to form a capacitive sensor for the outside handle of the vehicle; in an interference-free environment, the high-frequency and low-frequency mutual-capacitance reference values are collected, and the compensation parameter library is established in association with the parameters of the shell of the outside handle of the vehicle; the proximity signal is detected by using the self-capacitance channel of the electrode array, the high-frequency and low-frequency mutual-capacitance signals are collected, and the high-frequency and low-frequency mutual-capacitance signals are preprocessed; the high-frequency and low-frequency mutual-capacitance signals after the preprocessing are corrected by calling the compensation parameter library, the mutual-capacitance increment and the change slope of the high-frequency and low-frequency mutual-capacitance signals are calculated; and the human body touch and the water interference are distinguished by analyzing the high-frequency and low-frequency signals based on the mutual-capacitance increment and the change slope.

The embodiments of the present application disclose a state detection parameter adjustment method, apparatus, and wearable device. The method includes: if the difference between the current ambient temperature value and the specified temperature value is greater than a preset temperature threshold, obtaining a first capacitance value through a capacitance sensor; based on the comparison result of the current ambient temperature value and the specified temperature value and the first capacitance value, obtaining a first capacitance threshold, wherein the first capacitance threshold is greater than the first capacitance value, and the difference from the first capacitance value is less than a specified capacitance change value, and the specified capacitance change value is the difference between the capacitance value obtained by the capacitance sensor when the wearable device is in a worn state and the capacitance value obtained by the capacitance sensor when the wearable device is in a non-worn state. Thus, the above method improves the influence of temperature on the detection of the wearing state, thereby improving the accuracy of detecting whether the wearable device is in a user-worn state.

Techniques are provided for implementing liquid tolerance for a touch device. A sensor array of the touch device is scanned to generate response signals. In response to a response signal exceeding a touch threshold, a signal profile analysis is performed. The signal profile analysis includes sorting the response signals according to ascending order of delta positions to generate sorted signals. An extended vector of the sorted signals is formed. The extended vector of the sorted signals is analyzed using a fitted curve. In response to a feature of the fitted curve satisfying a criteria, the response signal is reported as a touch event. In response to the feature not satisfying the criteria, the response signal is rejected as a false touch.

The utility model discloses a resonant pressure sensor open-loop test circuit capable of improving signal-to-noise ratio, which comprises a movable pole plate, the upper end of the movable pole plate is connected with a first driving pole plate, a first detection pole plate and a second detection pole plate, the first driving pole plate is connected between the first detection pole plate and the second detection pole plate, and the second driving pole plate is connected between the first detection pole plate and the second detection pole plate. The lower end of the movable polar plate is connected with a second driving polar plate, a third detection polar plate and a fourth detection polar plate, the second driving polar plate is connected between the third detection polar plate and the fourth detection polar plate, and a capacitor C1 is connected between the first detection polar plate and the movable polar plate. According to the resonant pressure sensor open-loop test circuit capable of improving the signal-to-noise ratio, an interface circuit with low cost and a simple structure is provided for open-loop test of a resonant capacitive sensor, co-frequency interference is avoided through specific connection and driving voltage selection, and the signal-to-noise ratio of the open-loop test is improved.

The invention discloses a keyboard capacitive coupling fingerprint recognition method and system and a keyboard, and relates to the technical field of biological recognition, the method comprises the steps that a miniature capacitive sensor array is arranged below a keycap of the keyboard, the contact distance of the sensor array is set in a preset precision interval, and the sensor array adopts a capacitive coupling technology; when a user knocks the keycap, detecting a capacitance change value between a finger and the miniature capacitive sensor at a sampling rate of a preset interval through the sensor array; a capacitance detection sensitivity threshold value is adjusted through a self-adaptive calibration mechanism; synchronously acquiring key pressure parameters in the process of clicking the keyboard by fingers; matching the capacitance change value with a preset fingerprint template, and performing multi-dimensional identity verification in combination with the key pressure parameter to obtain a matching result; and executing identity authentication operation according to a matching result. According to the invention, the fingerprint identification function is seamlessly integrated into the daily-used input device without increasing extra space occupation, so that the user experience is improved.

The utility model relates to a piezoelectric and capacitor composite sensing's car door outer handle, car, including sensing unit, piezoelectric measurement branch, capacitor digital conversion circuit, treater, sensing unit includes piezoelectric film and the upper electrode and lower electrode respectively arranged in the upper and lower two faces of piezoelectric film, the upper electrode is oriented handle and is away from the direction of car body, as the multiplexing electrode of piezoelectric film's signal output electrode and capacitor sensor's sensing electrode, capacitor sensor forms the electric field for sensing the electric field of external object approach and / or contact handle outer surface, piezoelectric measurement branch is coupled respectively upper and lower electrode to obtain the piezoelectric signal of vibration generation, piezoelectric measurement branch is provided with amplifier at least to amplify piezoelectric signal, capacitor digital conversion circuit is coupled upper electrode to obtain self -capacitance and / or mutual capacitance, processing module is coupled piezoelectric measurement branch, capacitor digital conversion circuit respectively.

The application discloses a kind of based on directional shuttle-shaped cavity bimodal flexible capacitive sensor and preparation method thereof, belong to flexible electronic sensor technical field, by dispersing magnetic nanoparticles in low boiling point solvent to form magnetic fluid, emulsification dispersion in hydrogel prepolymer liquid, after rheological control, in turn carry out uniform magnetic field pre-stretching and pulse magnetic field strengthening lengthening, make droplet form shuttle-shaped;Again by half freezing lock shape, vacuum freeze drying removes solvent and makes magnetic nanoparticles deposit in cavity inner wall, completely freeze polymerization makes matrix solidification, finally in situ reduction forms conductive layer and is packaged and is prepared sensor, it has bimodal: when pressure is along the long axis direction of shuttle-shaped cavity, it is first electric capacity change rate, when it is along short axis direction, it is second electric capacity change rate, and second electric capacity change rate is greater than first electric capacity change rate, and pressure direction is identified by single electric capacity pair.The application structure is simple, sensitivity is high, stability is good, is suitable for electronic skin, intelligent prosthesis and man-machine interaction field.

The invention provides a passive capacitive sensor based on light-induced deformation material regulation and control and a preparation method thereof, and the passive capacitive sensor comprises an upper polar plate, a lower polar plate, a dielectric layer located between the two polar plates, and at least one light-induced deformation strip disposed between the upper polar plate and the lower polar plate. Two ends of the photo-induced deformation strip are respectively fixed on the upper polar plate and the lower polar plate, and the photo-induced deformation strip is made of a photo-induced bending deformation material; hollow electrodes are arranged on the surfaces of the upper polar plate and the lower polar plate; when external illumination acts on the light-induced deformation strip, the strip bends and deforms and drives the distance between the upper pole plate and the lower pole plate to change, and passive continuous adjustment of the capacitance value is achieved. Strips are driven to deform through illumination intensity changes so as to adjust the distance between the polar plates in a non-contact mode, and continuous dynamic regulation and control of the capacitance value are achieved.

According to an embodiment of the present invention, an electronic apparatus may comprise: a first antenna; a second antenna; a communication circuit set to transmit and / or receive a signal in the frequency band selected or designated via the first antenna and / or the second antenna; a sensor IC which is electrically connected to the first antenna and the second antenna and measures a capacitance; a first capacitor connected to a first electrical path between the first antenna and the sensor IC; and a second capacitor connected to a second electrical path between the second antenna and the sensor IC. Various other embodiments may be possible.

The invention relates to an intelligent welcome mode control method and system based on capacitive sensor human body recognition, and the method comprises the steps: measuring the electric field disturbance when a human body is close to a vehicle, and determining the height contour of the human body based on the electric field disturbance; calculating the electric field separation degree of each height in the height contour, and determining the hip point position of the human body based on the electric field separation degree; and adjusting the suspension height based on the hip position and the height of the ground. Non-contact physical sign measurement is achieved through a capacitive sensor, then optimal adjusting parameters adapting to the human body are decided, an air suspension serves as an actuator, the vehicle state is adjusted, when a user pulls open a vehicle door, the height of the vehicle is adjusted to the most suitable state, and conversion from'people adapting to the vehicle 'to'the vehicle actively adapting to people' is achieved.

To provide a user-friendly faucet using a capacitance sensor. [Solution] This invention comprises a water outlet, a control unit that switches between water discharge and water stop from the water outlet, an operating unit that controls the flow rate and / or temperature (mixture ratio of hot and cold water) of water discharged from the water outlet, and a capacitance sensor that detects contact with a human body; if, during water discharge, the change in capacitance of the capacitance sensor exceeds a first threshold and remains below a second threshold that is greater than the first threshold for a certain period of time, water is stopped, and if the change in capacitance of the capacitance sensor exceeds the second threshold that is greater than the first threshold, water discharge continues.