Water level detection device based on capacitance detection

Abstract

The utility model belongs to the technical field of water level detection, in particular to a water level detection device based on capacitance detection, which comprises touch sensing electrodes, driving electrodes, a resistor R1, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, an integrated circuit controller U1 and a light emitting diode (LED), and the touch sensing electrodes and the driving electrodes are alternately arranged to form an array structure. According to the water level detection device based on capacitance detection, data of PIN1 and TOUCHCH in the digital-analog channel and data of PIN6 in the reference channel are collected, and then whether water exists at the touch PAD is obtained through calculation, so that whether water exists or not is detected under the condition that a liquid medium is not contacted, and the water level detection device based on capacitance detection is sanitary, high in cost performance and particularly suitable for being applied to equipment such as humidifiers and water dispensers.

Description

Technical Field

[0001] The utility model relates to the technical field of water level detection, in particular to a water level detection device based on capacitance detection. Background Art

[0002] Water level detection refers to detecting the water level of various water qualities such as distilled water, purified water, and tap water. The currently commonly used water level detection method is usually to detect the presence of water through contact or sensors (such as ball valves and reed switches). In actual use, the detection devices detected by contact or sensors are prone to aging and are not hygienic enough. They are not suitable for water level detection of equipment such as humidifiers and water dispensers. Therefore, a water level detection device based on capacitance detection is needed. Utility Model Content

[0003] Based on the technical problems in existing water level detection, the utility model proposes a water level detection device based on capacitance detection.

[0004] The utility model proposes a water level detection device based on capacitance detection, including touch sensing electrodes, drive electrodes, resistors R1, R3, R4, capacitors C1, C2, C3, an integrated circuit controller U1, and a light-emitting diode LED. The touch sensing electrodes and the drive electrodes are alternately arranged to form an array structure.

[0005] An insulating layer is provided between the touch sensing electrodes and the driving electrodes.

[0006] The resistor R1 , the resistor R3 , and the resistor R4 form a voltage divider network for adjusting the voltage supplied to the light emitting diode LED.

[0007] The capacitor C1 , the capacitor C2 , and the capacitor C3 serve as bypass capacitors for filtering high-frequency noise.

[0008] The integrated circuit controller U1 is used to collect data from the touch channel (PIN1, TOUCH_CH) and the reference channel (PIN6), and calculate whether there is water. The model of the integrated circuit controller U1 is PMS161.

[0009] In addition to participating in the calculation, the capacitor C1 also has the function of assisting in power-on water detection.

[0010] Preferably, the VDD pin of the integrated circuit controller U1 is connected to the common node of the resistor R1, the resistor R3 and the resistor R4 and the positive terminal VDD of the light emitting diode LED, and the GND pin of the integrated circuit controller U1 is connected to the ground line GND.

[0011] Preferably, one end of the resistor R1 is connected to the ground line GND, and the other end of the resistor R1 is connected to one end of the resistor R3, one end of the resistor R4 and the positive terminal VDD of the light emitting diode LED.

[0012] Preferably, one end of the resistor R3 is connected to one end of the resistor R1 , one end of the resistor R4 and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R3 is electrically connected to the integrated circuit controller U1 .

[0013] Preferably, one end of the resistor R4 is connected to one end of the resistor R1 , one end of the resistor R3 and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R4 is connected to another pin of the integrated circuit controller U1 .

[0014] Preferably, two ends of the capacitor C1 , the capacitor C2 and the capacitor C3 are connected to the integrated circuit controller U1 and a ground line GND, respectively.

[0015] Preferably, the positive terminal of the light emitting diode (LED) is connected to a common node of the resistor R1 , the resistor R3 , and the resistor R4 , and the negative terminal of VDD is connected to the ground line GND.

[0016] The beneficial effects of the present invention are:

[0017] By setting up the acquisition of data from PIN1 and TOUCH_CH in the digital-to-analog channel and PIN6 in the reference channel, and then calculating whether there is water at the touch pad, the presence of water can be detected without contacting the liquid medium. This is hygienic and cost-effective, and is particularly suitable for applications in equipment such as humidifiers and water dispensers. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the electrical schematic diagram of the integrated circuit controller U1 of the water level detection device based on capacitance detection proposed by the utility model;

[0019] Figure 2 This is a schematic diagram of a water level detection device based on capacitance detection proposed by the utility model, in which a single chip microcomputer detects water level without water;

[0020] Figure 3 This is a schematic diagram of a single-chip microcomputer detecting water level in a water level detection device based on capacitance detection proposed by the utility model.

[0021] In the figure: 1. Power supply; 2. Transparent test vessel. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-Figure 3 , a water level detection device based on capacitance detection, such as Figure 1-Figure 2 As shown, it includes touch sensing electrodes, driving electrodes, resistors R1, R3, R4, capacitors C1, C2, C3, an integrated circuit controller U1, and a light-emitting diode LED. The touch sensing electrodes and the driving electrodes are alternately arranged to form an array structure.

[0024] An insulating layer is provided between the touch sensing electrodes and the driving electrodes.

[0025] Resistors R1, R3 and R4 form a voltage divider network for adjusting the voltage supplied to the light emitting diode LED.

[0026] Capacitor C1, capacitor C2, and capacitor C3 serve as bypass capacitors for filtering high-frequency noise.

[0027] The integrated circuit controller U1 is used to collect data from the touch channel (PIN1, TOUCH_CH) and the reference channel (PIN6), and calculate whether water exists. The model of the integrated circuit controller U1 is PMS161.

[0028] In addition to participating in the calculation, capacitor C1 also has the function of assisting in power-on water detection.

[0029] The VDD pin of the integrated circuit controller U1 is connected to a common node of the resistors R1 , R3 and R4 and a positive terminal VDD of the light emitting diode LED, and the GND pin of the integrated circuit controller U1 is connected to the ground line GND.

[0030] One end of the resistor R1 is connected to the ground line GND, and the other end of the resistor R1 is connected to one end of the resistor R3, one end of the resistor R4, and the positive terminal VDD of the light emitting diode LED.

[0031] One end of the resistor R3 is connected to one end of the resistor R1 , one end of the resistor R4 , and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R3 is electrically connected to the integrated circuit controller U1 .

[0032] One end of the resistor R4 is connected to one end of the resistor R1, one end of the resistor R3 and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R4 is connected to another pin of the integrated circuit controller U1.

[0033] Both ends of the capacitor C1 , the capacitor C2 and the capacitor C3 are connected to the integrated circuit controller U1 and the ground line GND, respectively.

[0034] The positive terminal of the light emitting diode (LED) is connected to a common node of the resistors R1 , R3 , and R4 , and the negative terminal of the VDD is connected to the ground line GND.

[0035] By setting the data of PIN1 and TOUCH_CH in the digital-analog channel and PIN6 in the reference channel, and then calculating whether there is water at the touch PAD, it is possible to detect whether there is water without contacting the liquid medium. This is hygienic and cost-effective, and is particularly suitable for detecting transparent water-filled containers, such as humidifiers and water dispensers. In addition, this device has non-contact water detection, simple circuit, no additional sensors, and is very energy-saving (0.2-0.5uA@5V). It is environmentally friendly and hygienic, non-contact and not easy to age, and the cost is very low.

[0036] Working principle: Figure 1 As shown in the figure, the data of the digital-analog channel (PIN1, TOUCH_CH) and the reference channel (PIN6) are collected through the capacitive touch microcontroller. Figure 2-Figure 3 As shown, it is then calculated whether there is water at the touch pad. When water is detected, the light emitting diode (LED) emits light to display a water signal. In addition to participating in the calculation, the capacitor C1 also assists in powering on the water detection function.

[0037] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A water level detection device based on capacitance detection, comprising a touch sensing electrode, a driving electrode, a resistor R1, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a capacitor C3, an integrated circuit controller U1, and a light-emitting diode LED, characterized in that: The touch sensing electrodes and the driving electrodes are alternately arranged to form an array structure; An insulating layer is provided between the touch sensing electrode and the driving electrode; The resistor R1, the resistor R3 and the resistor R4 form a voltage divider network for adjusting the voltage supplied to the light emitting diode LED; The capacitor C1, the capacitor C2 and the capacitor C3 serve as bypass capacitors for filtering high-frequency noise; The integrated circuit controller U1 is used to collect data from the touch channel and the reference channel and calculate whether there is water. The model of the integrated circuit controller U1 is PMS161; In addition to participating in the calculation, the capacitor C1 also has the function of assisting in power-on water detection.

2. The water level detection device based on capacitance detection according to claim 1, characterized in that: The VDD pin of the integrated circuit controller U1 is connected to a common node of the resistor R1 , the resistor R3 , and the resistor R4 and the positive terminal VDD of the light emitting diode LED, and the GND pin of the integrated circuit controller U1 is connected to the ground line GND.

3. The water level detection device based on capacitance detection according to claim 1, characterized in that: One end of the resistor R1 is connected to the ground line GND, and the other end of the resistor R1 is connected to one end of the resistor R3, one end of the resistor R4, and the positive terminal VDD of the light emitting diode LED.

4. The water level detection device based on capacitance detection according to claim 1, characterized in that: One end of the resistor R3 is connected to one end of the resistor R1 , one end of the resistor R4 , and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R3 is electrically connected to the integrated circuit controller U1 .

5. The water level detection device based on capacitance detection according to claim 1, characterized in that: One end of the resistor R4 is connected to one end of the resistor R1 , one end of the resistor R3 and the positive terminal VDD of the light emitting diode LED, and the other end of the resistor R4 is connected to another pin of the integrated circuit controller U1 .

6. The water level detection device based on capacitance detection according to claim 1, characterized in that: Two ends of the capacitor C1 , the capacitor C2 , and the capacitor C3 are connected to the integrated circuit controller U1 and a ground line GND, respectively.

7. The water level detection device based on capacitance detection according to claim 1, characterized in that: The positive terminal of the light emitting diode LED is connected to a common node of the resistor R1 , the resistor R3 , and the resistor R4 , and the negative terminal VDD is connected to the ground line GND.

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