Water leakage protection device

Abstract

The embodiment of the utility model provides a water leakage protection device. The water leakage protection device comprises humidity sensitive paper, at least one color sensor and a power-off device. Wherein the humidity sensitive paper is arranged on the inner wall of a shell of the outdoor equipment, and the humidity sensitive paper covers the first area; the at least one color sensor is electrically connected with a circuit board in the outdoor equipment shell, and the color sensor and the humidity sensitive paper are oppositely arranged; and the power-off device is electrically connected with the color sensor and the circuit board.

Description

Technical Field

[0001] This specification relates to the technical field of outdoor equipment protection, and in particular to a water leakage protection device. Background Art

[0002] Precision outdoor equipment, such as audio equipment, cameras, and detectors, is exposed to a variety of extreme weather conditions during use. Water leaks can damage equipment in humid environments or on rainy days. Traditional leakage protection systems often rely on complex leak detection and alarm devices or external leak detectors, making them unsuitable for small, precision instruments. Alternatively, they may shut off power only after a water leak has already caused an impact (e.g., a current leak), making repairs difficult and costly for precision instruments.

[0003] Therefore, a water leakage protection device is provided, which can be applied to outdoor equipment, promptly identify water leakage and cut off power, protect circuit boards from short circuit damage, and minimize user losses. Utility Model Content

[0004] One or more embodiments of this specification provide a water leakage protection device, which includes moisture-sensitive paper, at least one color sensor, and a power-off device. The moisture-sensitive paper is arranged on the inner wall of the housing of an outdoor device, and the moisture-sensitive paper covers a first area; at least one color sensor is electrically connected to a circuit board in the housing of the outdoor device, and the color sensor is arranged opposite to the moisture-sensitive paper; and the power-off device is electrically connected to the color sensor and the circuit board.

[0005] In some embodiments, the distance between the moisture-sensitive paper and at least one of the color sensors is less than or equal to a distance threshold.

[0006] In some embodiments, there are multiple color sensors, and the multiple color sensors are arranged around the circuit board.

[0007] In some embodiments, the power-off device includes a connected state and a disconnected state; when the power-off device is in the connected state, the circuit board is powered on; when the power-off device is in the disconnected state, the circuit board is powered off.

[0008] In some embodiments, the device includes a control unit, which is electrically connected to at least one of the color sensors and the power-off device; the control unit is configured to control the power-off device to switch from the connected state to the disconnected state based on the color sensor recognizing that the color of the moisture-sensitive paper is the first target color.

[0009] In some embodiments, the device includes a prompt device, which is arranged on the outside of the housing of the outdoor equipment; the prompt device is configured to operate when the power-off device is in the disconnected state.

[0010] In some embodiments, the device includes a lighting unit disposed proximate to at least one of the color sensors.

[0011] In some embodiments, the device includes a water absorbing unit, and the water absorbing unit is in contact with the moisture-sensitive paper.

[0012] In some embodiments, the device includes a drying unit, which is arranged near the water absorption unit. The drying unit is configured to start operating when at least one of the color sensors recognizes that the color of the moisture-sensitive paper is the second target color.

[0013] In some embodiments, an edge of the humidity-sensitive paper close to the first area is a jagged edge, and at least one of the color sensors is disposed close to the jagged edge. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0015] Figure 1 is a schematic diagram of an exemplary cross-sectional structure of a water leakage protection device according to some embodiments of this specification;

[0016] Figure 2 This is a diagram of an application scenario of a water leakage protection device according to some embodiments of this specification;

[0017] Figure 3 This is another application scenario diagram of the water leakage protection device shown in some embodiments of this specification;

[0018] Figure 4 is an exemplary top view of a water leakage protection device according to some embodiments of this specification;

[0019] Figure 5 is an exemplary structural diagram of a water leakage protection device in a connected state according to some embodiments of this specification;

[0020] Figure 6 is an exemplary structural diagram of a water leakage protection device in a disconnected state according to some embodiments of this specification;

[0021] Figure 7is another exemplary cross-sectional structural diagram of a water leakage protection device according to some embodiments of this specification;

[0022] Figure 8 This is another exemplary cross-sectional structural diagram of the water leakage protection device shown in some embodiments of this specification. DETAILED DESCRIPTION

[0023] To more clearly illustrate the technical solutions of the embodiments of this specification, the following briefly describes the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this specification. Those skilled in the art can apply this specification to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0024] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0025] As used in this specification, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may include the plural. Generally speaking, the terms "include" and "comprising" only indicate that the elements specifically identified are included, and these elements do not constitute an exclusive list. The device may also include other elements.

[0026] Figure 1 It is a schematic diagram of an exemplary cross-sectional structure of a water leakage protection device according to some embodiments of this specification.

[0027] In some embodiments, as Figure 1 As shown, the water leakage protection device includes a moisture-sensitive paper 110 , at least one color sensor 120 and a power-off device 130 .

[0028] Humidity-sensitive paper 110 is an indicator component that changes color when exposed to water. For example, humidity-sensitive paper 110 can be humidity indicator paper or colloidal humidity-sensitive paper. Humidity indicator paper contains chemicals that react with water and change color, such as liquid crystals, dyes, or pH indicators. Colloidal humidity-sensitive paper changes color when exposed to water by utilizing the optical properties of a colloidal material that changes with humidity. The colloidal material can be colloidal gold or colloidal silver. Humidity-sensitive paper 110 can also be made of other materials that change color when exposed to water.

[0029] In some embodiments, the wet-sensitive paper 110 changes from a first color to a second color when exposed to water. The first color and the second color are different colors. For example, the wet-sensitive paper 110 may change from white to red when exposed to water, i.e., the first color is white and the second color is red.

[0030] In some embodiments, the wet-sensitive paper 110 undergoes multiple color changes after contacting water, and the color changes are related to the humidity value. The humidity value is a parameter value that reflects the humidity of the air near the wet-sensitive paper and can be expressed as a percentage. The larger the percentage, the greater the humidity. For example, when the humidity value is less than the first humidity threshold, the wet-sensitive paper 110 is blue or white. When the humidity value is greater than or equal to the first humidity threshold and less than the second humidity threshold, the wet-sensitive paper 110 is pink. When the humidity value is greater than the second humidity threshold, the wet-sensitive paper 110 is green. The first humidity threshold and the second humidity threshold can be set as needed. For example, the first humidity threshold can be set to 20%, and the second humidity threshold can be set to 40%.

[0031] In some embodiments, as Figure 1 As shown, the moisture-sensitive paper 110 is arranged on the inner wall of the housing 210 of the outdoor device, and the moisture-sensitive paper 110 covers the first area 101 .

[0032] Outdoor equipment is equipment used outdoors and subject to water leakage risks. Examples include audio equipment, cameras, and various detectors. The housing of outdoor equipment is the outer shell that comes into contact with the outside world.

[0033] Figure 2 This is an application scenario diagram of the water leakage protection device shown in some embodiments of this specification. Figure 3 This is another application scenario diagram of the water leakage protection device shown in some embodiments of this specification.

[0034] The first area 101 is an area on the housing of the outdoor device that is at risk of water leakage. For example, the first area 101 may be a housing seam location and / or an interface outlet location. For example, Figure 2 As shown, the outdoor device includes an upper shell 211 and a lower shell 212, and the first area 101 is the shell joint position between the upper shell 211 and the lower shell 212. The moisture-sensitive paper 110 is pasted on the inner wall of the shell 210 around the shell joint position and covers the shell joint. For example, Figure 3 As shown, the first area 101 is the interface outlet position on the housing 210 of the outdoor device. The moisture-sensitive paper 110 is attached to the inner wall of the housing 210 around the interface outlet position.

[0035] In some embodiments, the edge of the humidity-sensitive paper 110 close to the first region 101 is a jagged edge, and the at least one color sensor 120 is disposed close to the jagged edge.

[0036] For example, when the first area 101 is a seam position, the edge of the wet-sensitive paper 110 near the seam position is a serrated edge. For another example, when the first area 101 is a line outlet position, the edge of the wet-sensitive paper 110 near the line outlet position is a serrated edge.

[0037] The serrated edge can increase the contact area between the paper and the liquid, and the capillary phenomenon of the serrated edge can increase the absorption speed of the liquid and improve the color development speed of the moisture-sensitive paper, so that the color sensor can recognize the color change of the moisture-sensitive paper more quickly and the power-off device can be powered off, thus timely avoiding short circuit of the circuit board due to water leakage.

[0038] The color sensor 120 is a sensor for identifying color changes. For example, the color sensor 120 can be an optical sensor, an RGB sensor, a chromaticity sensor, etc.

[0039] In some embodiments, the number of color sensors 120 is related to the size and / or number of the first region 101. For example, the wider the seam, the more color sensors there are; or the larger the size or the greater the number of interface outlets, the more color sensors there are.

[0040] In some embodiments, at least one color sensor 120 is electrically connected to the circuit board 220 in the outdoor device housing 210. The color sensor 120 is arranged relative to the wet-sensitive paper 110. The relative arrangement can be arranged at the same horizontal plane and without obstruction. For example, the center of the color sensor 120 and the center of the wet-sensitive paper 110 are located at the same horizontal plane. For another example, the center of the color sensor 120 and the lower edge of the wet-sensitive paper 110 are located at the same horizontal plane. For another example, the center of the color sensor 120 and the joint position are located at the same horizontal plane, and the wet-sensitive paper 110 covers the joint position. There is no obstruction between the color sensor 120 and the wet-sensitive paper 110.

[0041] The circuit board 220 is an integrated circuit device within the outdoor device housing 210. For example, the circuit board 220 may be a PCB board.

[0042] In some embodiments, the color sensor 120 may recognize that the color of the moisture-sensitive paper 110 is the first target color, output an electrical signal, and send the electrical signal to the power-off device 130 .

[0043] The first target color is the target color of the moisture-sensitive paper, indicating a power outage. For example, if the moisture-sensitive paper 110 changes from the first color to the second color upon contact with water, the first target color can be set to the second color. For details about the first and second colors, see above. For another example, if the moisture-sensitive paper 110 undergoes multiple color changes upon contact with water, the first target color can be set to one or more of the colors after these changes. For example, if the moisture-sensitive paper changes from white to pink, and then from pink to green, as the humidity level changes, the first target color can be set to pink and / or green.

[0044] In some embodiments, the distance between the wet-sensitive paper 110 and the at least one color sensor 120 is less than or equal to a distance threshold. The distance threshold can be set empirically. For example, the distance threshold is related to the maximum sensing distance of the color sensor 120. For example, if the maximum sensing distance of the color sensor 120 is 10 mm, the distance threshold can be set to 10 mm, 9 mm, or the like.

[0045] By controlling the distance between the wet-sensitive paper and the color sensor, it can be ensured that the wet-sensitive paper is within the sensing range of the color sensor, thereby ensuring that the color sensor can recognize the color of the wet-sensitive paper.

[0046] Figure 4 is an exemplary top view of a water leakage protection device according to some embodiments of this specification.

[0047] In some embodiments, there are multiple color sensors 120 , and the multiple color sensors 120 are disposed around the circuit board 220 .

[0048] For example, Figure 4 As shown, multiple color sensors 120 are arranged around the circuit board 220, and the wet-sensitive paper 110 is arranged around the first area 101 of the housing 210. The shortest distance between each color sensor 120 and the wet-sensitive paper 110 is less than or equal to the distance threshold.

[0049] When the first area 101 of water leakage risk for outdoor equipment is at a joint in the housing, multiple leak points may exist due to the wide joint or the joint encircling the housing. Water may enter from different locations in the joint during a leak. By controlling the number of color sensors, the color sensors can promptly identify the color changes of the humidity-sensitive paper at different joint locations, thereby promptly detecting leaks.

[0050] The power-off device 130 is a device for cutting off the power supply of the outdoor equipment. For example, the power-off device can be a circuit breaker or a control switch.

[0051] In some embodiments, the power-off device 130 is electrically connected to the color sensor 120 and the circuit board 220 .

[0052] In some embodiments, the power off device 130 can cut off the power supply to the circuit board 220 in the outdoor device based on the electrical signal sent by the color sensor 120. For details about the first target color, please refer to the above description.

[0053] Figure 5 This is an exemplary structural diagram of a water leakage protection device in a connected state according to some embodiments of this specification. Figure 6 This is an exemplary structural diagram of a water leakage protection device in a disconnected state according to some embodiments of this specification.

[0054] In some embodiments, the power disconnect device 130 includes a connected state and a disconnected state. When the power disconnect device is in the connected state, the circuit board 220 is powered on; when the power disconnect device is in the disconnected state, the circuit board 220 is powered off.

[0055] For example, Figure 5 As shown, the power disconnect device 130 is in a connected state, the circuit board 220 is powered on, and the outdoor equipment operates normally.

[0056] For example, Figure 6 As shown, water enters from the first area 101, the moisture-sensitive paper 110 changes color when exposed to water, the power-off device 130 is in the disconnected state, the circuit board 220 is powered off, and the outdoor equipment stops working.

[0057] In some embodiments, the power-off device 130 may switch from a connected state to a disconnected state based on the color sensor 120 recognizing that the color of the moisture-sensitive paper 110 is the first target color, thereby cutting off the power supply to the outdoor device.

[0058] When the outdoor equipment stops working, maintenance personnel can inspect and repair the outdoor equipment to prevent the impact of the leakage from further expanding.

[0059] In some embodiments, as Figure 1 As shown, the water leakage protection device includes a lighting unit 140 . The lighting unit 140 is disposed near the at least one color sensor 120 .

[0060] The lighting unit 140 is a device for illuminating the working environment of the color sensor 120. For example, the lighting unit 140 can be an LED lamp or other lighting device.

[0061] In some embodiments, the lighting unit 140 is soldered on the circuit board 220 , and the lighting unit 140 is electrically connected to the circuit board 220 .

[0062] In some embodiments, the area illuminated by the lighting unit 140 includes the area where the color sensor 120 and the moisture-sensitive paper 110 are located. The lighting unit 140 can provide a light field so that the color sensor 120 can sense the color change of the moisture-sensitive paper 110.

[0063] For some high-precision, high-end outdoor equipment, damage to the circuit board can lead to significant repair costs. Some embodiments of this specification utilize the color-changing properties of moisture-sensitive paper when exposed to water, combined with a color recognition sensor and a power-off device for circuit control. This allows for immediate identification of leak risks. The change in color triggers a circuit breaker, protecting the circuit board from short-circuit damage and minimizing user losses. This also prevents short circuits and leakage in precision instruments, reducing the difficulty of subsequent repairs on outdoor equipment.

[0064] Figure 7 This is another exemplary cross-sectional structural diagram of the water leakage protection device shown in some embodiments of this specification.

[0065] In some embodiments, as Figure 7 As shown, the water leakage protection device includes a control unit 150. The control unit 150 is electrically connected to at least one color sensor 120 and a power-off device 130.

[0066] The control unit 150 is a device for controlling the power off device 130 to be turned on and off.

[0067] In some embodiments, the control unit 150 is configured to control the power-off device 130 to switch from the connected state to the disconnected state based on the color sensor 120 identifying that the color of the moisture-sensitive paper 110 is the first target color. Figure 1 Related instructions.

[0068] In some embodiments, the color sensor 120 identifies the color of the moisture-sensitive paper 110 as the first target color, outputs an electrical signal, and transmits it to the control unit 150. In some embodiments, the control unit 150 can obtain the electrical signal transmitted by the color sensor 120. In response to not receiving the electrical signal transmitted by the color sensor 120, the control unit 150 can control the power disconnect device 130 to remain in the connected state; in response to receiving the electrical signal transmitted by the color sensor 120, the control unit 150 can control the power disconnect device 130 to switch from the connected state to the disconnected state.

[0069] In some embodiments, as Figure 7 As shown, the water leakage protection device includes a prompting device 160. The prompting device 160 is arranged outside the housing 210 of the outdoor device. The prompting device 160 is configured to operate when the power off device 130 is in the disconnected state.

[0070] In some embodiments, the prompt device 160 may be electrically connected to the control unit 150. In response to receiving the electrical signal sent by the color sensor 120, the control unit 150 may control the prompt device 160 to start.

[0071] Prompt device 160 is a device for issuing prompt information. For example, prompt device 160 may be a warning light or a warning bell. The prompt device 160 may operate by, for example, lighting a warning light or ringing a warning bell. The prompt information is information that alerts users to the risk of water leakage in outdoor equipment. For example, the prompt information may be a warning light or a warning bell.

[0072] In some embodiments, as Figure 7 As shown, when water (e.g., rainwater) enters the outdoor device through the first area 101, it first contacts the moisture-sensitive paper 110 affixed to the inside of the housing. This moisture-sensitive paper 110 changes color when exposed to water. The color sensor 120 recognizes the color of the moisture-sensitive paper 110 as the first target color and outputs an electrical signal to the control unit 150. Based on the electrical signal, the control unit 150 controls the power disconnect device 130 to switch from a connected state to a disconnected state, cutting off the power supply to the circuit board 220 within the outdoor device. Simultaneously, the prompt device 160 activates, issuing a prompt message, allowing the user to repair the outdoor device based on the prompt message.

[0073] The water leakage of outdoor equipment can be fed back to the outside world through the prompt device. The working of the prompt light indicates that there is a risk of water leakage in the outdoor equipment, and the user can discover and deal with it in time.

[0074] Figure 8 This is another exemplary cross-sectional structural diagram of the water leakage protection device shown in some embodiments of this specification.

[0075] In some embodiments, as Figure 8 As shown, the water leakage protection device includes a water absorbing unit 170. The water absorbing unit 170 is in contact with the moisture-sensitive paper 110.

[0076] The water absorption unit 170 is a device for absorbing moisture entering the outdoor equipment. In some embodiments, the water absorption unit 170 may include absorbent cotton or a desiccant.

[0077] In some embodiments, the water absorption unit 170 is located above, below, or on the side of the moisture-sensitive paper 110 and does not block the moisture-sensitive paper 110 , thereby not affecting the color recognition of the moisture-sensitive paper 110 by the color sensor 120 .

[0078] The water absorption unit 170 can absorb some of the liquid that enters the outdoor equipment, thereby preventing water from entering the electronic components of the outdoor equipment and causing short circuits before the power is turned off. At the same time, it can further absorb some of the liquid after the power is turned off, preventing the leakage from spreading and reducing the difficulty of subsequent maintenance of the outdoor equipment by users.

[0079] In some embodiments, as Figure 8As shown, the water leakage protection device includes a drying unit 180. The drying unit 180 is disposed near the water absorption unit 170. In some embodiments, the drying unit 180 is configured to start operating when the at least one color sensor 120 recognizes that the color of the moisture-sensitive paper 110 is the second target color.

[0080] The drying unit 180 is a device for drying the water absorption unit and the internal environment of the outdoor equipment. For example, the drying unit 180 can be a fan or a baking lamp.

[0081] In some embodiments, the drying unit 180 is electrically connected to the circuit board 220 and the color sensor 120 .

[0082] The second target color is the color of the moisture-sensitive paper corresponding to the drying unit when the drying is in progress. The second target color can be the same as or different from the first target color. Figure 1 Related instructions.

[0083] For example, when the moisture-sensitive paper 110 is exposed to water, it changes from the first color to the second color, and the second target color can be set to the second color. At this time, the second target color is the same as the first target color. For more information about the first color and the second color, please refer to Figure 1 Related instructions.

[0084] For another example, the wet-sensitive paper 110 undergoes multiple color changes according to the changes after it comes into contact with water, and the second target color can be set to one of the colors after the change. The second target color can be different from the first target color, and the humidity value corresponding to the second target color is greater than the humidity value corresponding to the first target color. For example, when the humidity value increases to 20%, the wet-sensitive paper 110 changes from white to pink, and the humidity value continues to increase to 40%, and the wet-sensitive paper 110 changes from pink to green. Then the first target color can be set to pink, and the second target color can be set to green. For more information about the relationship between the color of wet-sensitive paper and humidity changes, please refer to Figure 1 Related instructions.

[0085] By installing a drying unit, the drying device is activated when humidity is low, preventing moisture from penetrating into electronic components and ensuring the internal cavity of outdoor equipment is dry. If humidity does not increase further, there is no need to shut down for maintenance, reducing the number of maintenance times and costs.

[0086] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

[0087] This specification also uses specific terms to describe the embodiments of this specification. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "one embodiment," "an embodiment," or "an alternative embodiment" two or more times in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of this specification may be appropriately combined.

[0088] Similarly, it should be noted that in order to simplify the description disclosed in this specification and thus facilitate understanding of one or more embodiments of the invention, the description of the embodiments of this specification sometimes combines multiple features into a single embodiment, figure, or description thereof. In reality, the features of an embodiment may be less than all the features of a single embodiment disclosed above.

[0089] In some embodiments, numbers are used to describe the quantity of components and attributes. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification are approximate values, which may change according to the required characteristics of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of this specification are approximate values, in specific embodiments, the settings of such numerical values ​​are as accurate as possible within the feasible range.

[0090] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly described and illustrated in this specification.

Claims

1. A water leakage protection device, characterized in that: The device comprises moisture-sensitive paper, at least one color sensor and a power-off device, The moisture-sensitive paper is arranged on the inner wall of the housing of the outdoor device, and the moisture-sensitive paper covers the first area; At least one of the color sensors is electrically connected to a circuit board in the housing of the outdoor device, and the color sensor is arranged opposite to the humidity-sensitive paper; The power-off device is electrically connected to the color sensor and the circuit board.

2. The device according to claim 1, characterized in that The distance between the moisture-sensitive paper and at least one of the color sensors is less than or equal to a distance threshold.

3. The device according to claim 1, wherein: There are multiple color sensors, and the multiple color sensors are arranged around the circuit board.

4. The device according to claim 1, wherein The power-off device includes a connected state and a disconnected state; when the power-off device is in the connected state, the circuit board is powered on; when the power-off device is in the disconnected state, the circuit board is powered off.

5. The device according to claim 4, characterized in that The device includes a control unit electrically connected to at least one of the color sensors and the power-off device; The control unit is configured to control the power-off device to switch from the connected state to the disconnected state based on the color sensor recognizing that the color of the moisture-sensitive paper is the first target color.

6. The device according to claim 4, characterized in that The device includes a prompting device, which is arranged outside the shell of the outdoor equipment; the prompting device is configured to work when the power-off device is in the disconnected state.

7. The device according to claim 1, wherein: The device includes a lighting unit, which is arranged close to at least one of the color sensors.

8. The device according to claim 1, wherein: The device includes a water absorbing unit in contact with the moisture-sensitive paper.

9. The device according to claim 8, characterized in that The device includes a drying unit, which is arranged near the water absorption unit. The drying unit is configured to start operating when at least one of the color sensors recognizes that the color of the moisture-sensitive paper is a second target color.

10. The device according to claim 1, wherein: The edge of the humidity-sensitive paper close to the first area is a serrated edge, and at least one of the color sensors is arranged close to the serrated edge.

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