Sensor device and monitoring system

Abstract

To provide a technology capable of remotely confirming information of an object to be measured.SOLUTION: A sensor device comprises a moving body that changes a posture when a spring member from which an object to be measured having a variable moisture content is suspended contracts, and a sensor that detects a posture change state of the moving body and transmits detection information.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a sensor device and a monitoring system. [Background technology]

[0002] Patent Document 1 discloses a technique for measuring the weight of fruits and vegetables as a measurement object using a spring balance and controlling the moisture content of the fruits and vegetables based on the change from the initial weight. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-250686 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Patent Document 1, in order to manage the moisture content of fruits and vegetables, it is necessary to periodically go to the site and check the scale of the spring balance, which is time-consuming and costly.

[0005] In consideration of the above, the present disclosure aims to provide a technology that enables information on an object to be measured to be confirmed remotely. [Means for solving the problem]

[0006] The sensor device of the first aspect of the present disclosure comprises a moving body that changes posture when a spring member from which a measurement object having a changing moisture content is suspended contracts, and a sensor that detects the posture change state of the moving body and transmits detection information.

[0007] In the sensor device of the first embodiment, when the object to be measured dries and the moisture content decreases, the object to be measured becomes lighter and the spring member suspending the object to be measured contracts. When the spring member contracts, the mobile body changes its posture, and the sensor detects the change in posture of the mobile body and transmits detection information. By receiving this transmitted detection information, it becomes possible to remotely check the condition of the object to be measured (for example, the weight and moisture content of the object to be measured). This eliminates the need to periodically go to the site to check the condition of the object to be measured, thereby reducing the effort and cost.

[0008] A sensor device of a second aspect of the present disclosure is the sensor device of the first aspect, wherein the movable body has one end supported so as to be tiltable on the hanging base side of the spring member and the other end supported so as to be tiltable on an arm that is rotatably connected to the hanging tip side of the spring member, and the sensor is attached to the movable body and transmits tilt information of the movable body as the detection information.

[0009] In the sensor device of the second aspect, one end of the moving body to which the sensor is attached is tiltably supported on the suspension base side of the spring member, and the other end of the moving body is tiltably supported on an arm rotatably connected to the suspension tip side of the spring member, so that the change in posture of the moving body caused by the expansion and contraction of the spring member can be stabilized. This improves the accuracy of the tilt information as the detection information transmitted from the sensor attached to the moving body.

[0010] A sensor device of a third aspect of the present disclosure is the sensor device of the second aspect, wherein the spring member comprises a coil spring and a case for housing the coil spring, and one end of the movable body is rotatably supported on an upper end of the case.

[0011] In the sensor device of the third aspect, the moving body is attached to the case, which facilitates the work of attaching the moving body.

[0012] A sensor device according to a fourth aspect of the present disclosure is the sensor device according to any one of the first to third aspects, wherein the sensor has a function of detecting brightness and transmitting illuminance information.

[0013] In the sensor device of the fourth aspect, the sensor has a function of detecting brightness and transmitting illuminance information, so that it becomes possible to check the environment (environment related to brightness) around the object to be measured.

[0014] A sensor device according to a fifth aspect of the present disclosure is the sensor device according to any one of the first to fourth aspects, wherein the sensor has a function of detecting temperature and humidity and transmitting temperature and humidity information.

[0015] In the sensor device of the fifth aspect, ⇒The sensor detects temperature and humidity and transmits temperature and humidity information, making it possible to check the environment (temperature and humidity related environment) around the object being measured.

[0016] A sensor device according to a sixth aspect of the present disclosure includes a spring member from which a measurement object having a changing moisture content is suspended, a moving body that changes posture when the spring member contracts, and a sensor that detects the posture change state of the moving body and transmits detection information.

[0017] In the sensor device of the sixth aspect, when the object to be measured dries and the moisture content decreases, the object to be measured becomes lighter and the spring member suspending the object to be measured contracts. When the spring member contracts, the mobile body changes its posture, and the sensor detects the change in posture of the mobile body and transmits detection information. By receiving this transmitted detection information, it becomes possible to remotely check the condition of the object to be measured (for example, the weight and moisture content of the object to be measured). This eliminates the need to periodically go to the site to check the condition of the object to be measured, thereby reducing the effort and cost.

[0018] A monitoring system of a seventh aspect of the present disclosure includes a sensor device of any one of the first to sixth aspects, and a viewing means for receiving information transmitted from a sensor of the sensor device via a communication network and making the received information viewable on the communication network.

[0019] In the monitoring system of the seventh aspect, the information transmitted from the sensor of the sensor device can be viewed on the communication network by the viewing means. That is, it becomes possible to remotely confirm (monitor) the state of the measurement object (for example, the weight or moisture content of the measurement object).

[0020] A monitoring system of an eighth aspect of the present disclosure is the monitoring system of the seventh aspect, wherein when the information transmitted from the sensor includes tilt information of the moving body, the viewing means converts the tilt information into the weight of the object to be measured and makes it viewable.

[0021] In the monitoring system of the eighth aspect, when the information transmitted from the sensor includes tilt information of the moving body, the tilt information of the moving body is converted into the weight of the object to be measured by the viewing means and can be viewed. This makes it possible to remotely check (monitor) the state (weight) of the object to be measured.

[0022] A ninth aspect of the monitoring system of the present disclosure is the monitoring system of the eighth aspect, wherein the viewing means notifies an external terminal via a communication network that there has been a sudden change in weight when the weight of the measured object converted from the tilt information within a specified time period changes beyond a predetermined range.

[0023] In the monitoring system of the ninth aspect, if the weight of the object to be measured, converted from the tilt information of the moving body, changes beyond a predetermined range within a specified time, the external terminal is notified via the communications network of the sudden change in weight, so that a user of the external terminal can grasp the sudden change in weight of the object to be measured even when not accessing the communications network. Effect of the Invention

[0024] According to the present disclosure, it becomes possible to check information on an object to be measured remotely. [Brief description of the drawings]

[0025] [Figure 1]1 is a perspective view showing a state in which a sensor device according to an embodiment of the present disclosure is attached to a spring balance. [Diagram 2] FIG. 2 is a perspective view of the sensor device shown in FIG. [Diagram 3] 2 is a perspective view showing a state of a sensor when a measurement object is attached to the sensor device shown in FIG. 1. FIG. [Figure 4] FIG. 3 is an exploded perspective view of the sensor device shown in FIG. 2. [Diagram 5] 2 is a side view showing a state in which the sensor device shown in FIG. 1 is attached to a spring balance. [Figure 6] FIG. 6 is a side view of the sensor device showing a state in which a measurement object is suspended from the spring balance shown in FIG. 5. [Figure 7] FIG. 7 is a side view of the sensor device showing a state in which a measurement object is suspended from the spring balance shown in FIG. [Figure 8] 2 is a configuration diagram of an electronic device that constitutes the sensor device shown in FIG. 1. [Figure 9] FIG. 1 is a configuration diagram of a monitoring system according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, the embodiment for carrying out the present disclosure will be described based on the drawings. Components indicated by the same reference numerals in each drawing are the same or similar components. Note that duplicated explanations and reference numerals in the embodiments described below may be omitted. In addition, all drawings used in the following description are schematic, and the dimensional relationship of each element, the ratio of each element, etc. shown in the drawings do not necessarily match the actual ones. In addition, the dimensional relationship of each element, the ratio of each element, etc. between multiple drawings do not necessarily match.

[0027] 1, a sensor device 20 according to an embodiment of the present disclosure is a device that is attached to a spring balance 50 for use. Specifically, the sensor device 20 is a device that is attached to the spring balance 50 and transmits information about the state of a measurement target 100 suspended from the spring balance 50.

[0028] (Spring balance 50) First, the spring balance 50 to which the sensor device 20 of this embodiment is attached will be described. As shown in FIG. 1, a spring balance 50 to which the sensor device 20 is attached includes a coil spring (not shown) and a case 54 for housing the coil spring.

[0029] As shown in FIG. 1 and FIG. 3, the case 54 includes a case 54A and a case 54B. The case 54B is slidable relative to the case 54A. The case 54A is provided with a hook 56 for hanging the spring balance 50, for example, on a hook. In the present embodiment, the hook 56 is a U-shaped portion provided on the case 54A as an example. When the spring balance 50 is hung on a hook, the case 54A is located above the case 54B. Hereinafter, the hook 56 is referred to as the hanging base of the spring balance 50. The hanging base side of the spring balance 50 refers to the hanging base side of the spring balance 50 in the extension / contraction direction.

[0030] 1 and 3, the case 54B is provided with a hook 58 as an example of a holding portion for holding the measurement object 100. For example, the measurement object 100 (see FIG. 6) is hung on the hook 58, whereby the measurement object 100 is held by the spring balance 50. Hereinafter, the hook 58 is referred to as the hanging end of the spring balance 50. Note that the hanging base side of the spring balance 50 refers to the hook 58 side in the extension / contraction direction of the spring balance 50.

[0031] Moreover, one end of the coil spring (one end in the expansion / contraction direction) is connected to case 54A, and the other end of the coil spring (the other end in the expansion / contraction direction) is connected to case 54B (see, for example, FIG. 5). Therefore, when the measurement object 100 is hung on the hook 58, as shown in FIG. 6, the coil spring expands and case 54B slides downward relative to case 54A, and the length of case 54 increases. That is, the spring balance 50 expands. On the other hand, when the weight of the measurement object 100 becomes lighter, as shown in FIG. 7, the coil spring contracts and case 54B slides upward relative to case 54A, and the length of case 54 decreases. That is, the spring balance 50 contracts.

[0032] The measurement object 100, the weight of which is measured by the spring balance 50, is a material whose moisture content changes. Specifically, the measurement object 100 is a material whose moisture content decreases when dried. Examples of the measurement object 100 include foodstuffs (fruit and vegetables, fruits, marine products, etc.) that become dried goods when dried, and resin products before drying. In this embodiment, as shown in FIG. 6, the measurement object 100 is a persimmon as an example, but the present disclosure is not limited to this configuration. Note that persimmons become dried persimmons (dried goods) when dried. In addition, when multiple measurement objects are grouped together and hung on the spring balance 50, the multiple measurement objects are collectively referred to as the measurement object 100 (see FIG. 6).

[0033] (Sensor device 20) The sensor device 20 includes a bracket 22 and a sensor 40 .

[0034] 1 and 2, the bracket 22 is a member for attaching the sensor 40 to the spring balance 50. The bracket 22 in this embodiment includes a first connecting portion 24, a sensor attachment portion 26, an arm 28, and a second connecting portion 30.

[0035] 1 and 3, the first connecting portion 24 is a portion of the bracket 22 that is attached to the suspension base side of the spring balance 50. In this embodiment, the first connecting portion 24 is attached to the end portion (also referred to as the upper end portion) of the case 54A on the hook portion 56 side.

[0036] 1 and 3, the sensor mounting portion 26 is a portion of the bracket 22 that changes its posture when the spring balance 50 contracts, and is a portion to which the sensor 40 is attached. Specifically, one end of the sensor mounting portion 26 is supported tiltably on the suspension base side of the spring balance 50, and the other end is supported tiltably on the arm 28. More specifically, one end of the sensor mounting portion 26 is rotatably supported by a first connecting portion 24 attached to the case 54A of the spring balance 50, and is supported tiltably on the suspension base side of the spring balance 50 via the first connecting portion 24. The sensor mounting portion 26 is an example of a moving body of the present disclosure.

[0037] 1 and 2, the arm 28 is a portion of the bracket 22 that connects the sensor mounting portion 26 and the second connecting portion 30. Specifically, one end (also referred to as the upper end) of the arm 28 supports the other end of the sensor mounting portion 26 so that it can tilt. In addition, the other end of the arm 28 is rotatably connected to the hanging end side of the spring balance 50. More specifically, the other end of the arm 28 is rotatably connected to the second connecting portion 30 attached to the case 54B of the spring balance 50, and is rotatably connected to the hanging end side of the spring balance 50 via this second connecting portion 30.

[0038] 1 and 3, the second connecting part 30 is a part of the bracket 22 that is attached to the suspension end side of the spring balance 50. In this embodiment, the second connecting part 30 is attached to the end (also called the lower end) of the case 54B on the hook 58 side. The second connecting part 30 moves together with the hook 58 in the extension / contraction direction of the spring balance 50.

[0039] As shown in Figs. 1 and 2, the sensor 40 is attached to the sensor attachment portion 26 of the bracket 22. Specifically, the sensor 40 is attached to a flat portion (see Fig. 4) formed on the surface of the sensor attachment portion 26. In this embodiment, as shown in Fig. 4, the sensor 40 is attached to the sensor attachment portion 26 using a screw member, but other methods may be used as long as the sensor 40 can be attached to the sensor attachment portion 26. For example, the sensor 40 may be bonded to the sensor attachment portion 26, or a plurality of elastic claws may be provided on the sensor attachment portion 26, and the sensor may be fixed to the sensor attachment portion 26 by the elastic claws. The planar shape of the sensor 40 in this embodiment is, for example, a substantially rectangular shape, but is not limited to this configuration.

[0040] The sensor 40 has a function of detecting a change in the posture of the sensor mounting part 26 and transmitting detection information. Specifically, the sensor 40 is a sensor capable of detecting tilt with respect to the horizontal, and by being attached to the sensor mounting part 26, transmits tilt information (also referred to as angle information) of the sensor mounting part 26 as detection information.

[0041] The operation of the sensor 40 will be described. As shown in FIG. 6, when the measurement target 100 is hung on the hook 58 of the spring balance 50, the spring balance 50 extends and the attitude of the sensor mounting portion 26 changes. That is, the sensor mounting portion 26 tilts. As the sensor mounting portion 26 tilts, the sensor 40 attached to the sensor mounting portion 26 also tilts, and the sensor 40 transmits information on the tilt with respect to the horizontal direction. The sensor 40 of this embodiment detects the tilt of the sensor 40 and transmits the information periodically. That is, the sensor 40 transmits the tilt information periodically whether the sensor 40 is in a horizontal state or in a state tilted with respect to the horizontal. When the sensor 40 is in a horizontal state, for example, information that the angle with respect to the horizontal is zero is transmitted. 7, when the weight of the measurement target 100 becomes lighter, the spring balance 50 contracts and the attitude of the sensor mounting part 26 changes. That is, the sensor mounting part 26 tilts so as to return to a horizontal state. As the sensor mounting part 26 tilts, the sensor 40 attached to the sensor mounting part 26 also tilts, and the sensor 40 transmits information about the tilt with respect to the horizontal direction.

[0042] 8, the sensor 40 of this embodiment has a tilt detection unit 42 that detects tilt with respect to the horizontal, a transmission unit 44 that wirelessly transmits tilt information detected by the tilt detection unit 42 to the outside, and a power supply unit 46 that supplies power to the tilt detection unit 42 and the transmission unit 44. The power supply unit 46 may be configured using, for example, a storage battery or a solar power generation device.

[0043] Furthermore, the sensor 40 may have a function of detecting brightness and transmitting illuminance information, or may have a function of detecting temperature and humidity and transmitting temperature and humidity information. The sensor 40 has a brightness detection unit (not shown) so that the sensor 40 has a function of detecting brightness. Power is supplied to this brightness detection unit from the power supply unit 46. The illuminance information detected by the brightness detection unit is transmitted to the outside by the transmission unit 44. The sensor 40 has a temperature and humidity detection unit (not shown) so that the sensor 40 has a function of detecting temperature and humidity. Power is supplied to this temperature and humidity detection unit from the power supply unit 46. The temperature and humidity information detected by the temperature and humidity detection unit is transmitted to the outside by the transmission unit 44.

[0044] Next, a monitoring system 70 using the sensor device 20 of this embodiment will be described. As shown in FIG. 9, a monitoring system 70 of this embodiment is a system that receives information transmitted from a sensor device 20 and allows a user to view the received information over a communication network.

[0045] The monitoring system 70 includes a sensor device 20 and a server 80 as an example of a browsing means.

[0046] As described above, the sensor device 20 periodically transmits the tilt information of the sensor 40.

[0047] The server 80 is a cloud server that receives the tilt information (signal) transmitted from the sensor 40 via a communication network and makes the received tilt information viewable on the communication network.

[0048] The server 80 includes a transmission / reception unit 82, a storage unit 84, and a calculation unit 86. The transmission / reception unit 82 is a part that executes transmission and reception of information. The transmission / reception unit 82 of this embodiment receives information transmitted from the sensor device 20 via the communication network, and transmits a notification to the user's external terminal 90 via the communication network.

[0049] The storage unit 84 is a part that stores received information. For example, the storage unit 84 stores tilt information, illuminance information, temperature and humidity information, and the like, transmitted from the sensor 40. Furthermore, the storage unit 84 stores the inclination information of the sensor 40 in association with the weight of the measurement object 100. As an example, when the inclination information (angle information) of the sensor 40 is 45 degrees, the inclination information and the weight are stored in association with each other in the storage unit 84, such that the weight of the measurement object 100 is 5 kg.

[0050] When the information transmitted from the sensor 40 includes tilt information, the calculation unit 86 converts the tilt information into the weight of the measurement object 100 and makes it viewable. Specifically, for example, when the tilt information received from the sensor 40 is 45 degrees, the calculation unit 86 accesses the storage unit 84, reads out the weight of the measurement object 100 associated with 45 degrees, and displays it on the external terminal 90 used by the user. That is, the user can view the state of the measurement object 100 on a communication network line using the external terminal 90. Note that in this embodiment, the calculation unit 86 converts the tilt information from the sensor 40 into weight and makes it viewable, but the present disclosure is not limited to this configuration. The calculation unit 86 records the weight (initial weight) at the time when the measurement object 100 is attached to the spring scale 50 (measurement start time), and may obtain the moisture content of the measurement object 100 by subtracting the weight (dry weight) of the measurement object 100, which is periodically updated, from this initial weight, and may display the moisture content together with the dry weight. The external terminal 90 is not particularly limited as long as it is a terminal that can access a communication network, and examples of the external terminal include a smartphone, a tablet, and a laptop computer.

[0051] Furthermore, the calculation unit 86 may make the illuminance information viewable when the information transmitted from the sensor 40 includes illuminance information, and may make the temperature and humidity information viewable when the information transmitted from the sensor 40 includes temperature and humidity information. Furthermore, the calculation unit 86 may make the illuminance information and the temperature and humidity information viewable when the information transmitted from the sensor 40 includes illuminance information and temperature and humidity information.

[0052] Furthermore, if the weight of the measurement target 100 converted from the tilt information changes beyond a predetermined range within a specified time, the server 80 notifies the external terminal 90 via the communication network that a sudden change in weight has occurred. For example, if the measurement target 100 is removed from the spring balance 50, the tilt of the sensor 40 suddenly returns to the original state (returns to a horizontal state). In this case, since the weight calculated from the tilt information of the sensor 40 changes suddenly, a message such as an error occurrence is notified from the transmitting / receiving unit 82 to the external terminal 90 via the communication network.

[0053] Next, the operation of this embodiment will be described. In the sensor device 20 of this embodiment, as shown in Figs. 6 and 7, when the measurement object 100 dries and the moisture content decreases, the measurement object 100 becomes lighter and the spring balance 50 suspending the measurement object 100 shrinks. When the spring balance 50 shrinks, the sensor attachment part 26 changes its position, and the sensor 40 detects the change in position of the sensor attachment part 26 and transmits detection information. By receiving this transmitted detection information, it becomes possible to remotely check the state of the measurement object 100 (for example, the weight and moisture content of the measurement object 100). This eliminates the need to periodically go to the site to check the state of the measurement object 100, thereby reducing the effort and cost.

[0054] Furthermore, in the sensor device 20 of this embodiment, one end of the sensor mounting part 26 to which the sensor 40 is attached is supported tiltably on the hanging base side of the spring balance 50, and the other end of the sensor mounting part 26 is supported tiltably on the arm 28 rotatably connected to the hanging tip side of the spring balance 50, so that the change in posture of the sensor mounting part 26 accompanying the expansion and contraction of the spring balance 50 can be stabilized. This improves the accuracy of the tilt information as detection information transmitted from the sensor 40 attached to the sensor mounting part 26.

[0055] Furthermore, in the sensor device 20 of the present embodiment, one end of the sensor attachment portion 26 is attached to the case 54A via the first connecting portion 24, which makes the attachment work of the sensor attachment portion 26 easy.

[0056] Furthermore, in the sensor device 20 of this embodiment, since the sensor attachment portion 26 is attached to the spring balance 50, the weight of the measurement object 100 can be visually confirmed on-site.

[0057] Furthermore, in the sensor device 20 of this embodiment, if the sensor 40 has a function of detecting brightness and transmitting illuminance information, it becomes possible to check the environment (environment related to brightness) around the measurement target 100.

[0058] Furthermore, in the sensor device 20 of this embodiment, if the sensor 40 has a function of detecting temperature and humidity and transmitting temperature and humidity information, it becomes possible to check the environment (environment related to temperature and humidity) around the measurement object.

[0059] In addition, in the monitoring system 70 of this embodiment, the information transmitted from the sensor 40 of the sensor device 20 by the server 80 can be viewed on the communication network. That is, it becomes possible to remotely confirm (monitor) the state of the measurement object 100 (for example, the weight and moisture content of the measurement object 100).

[0060] Furthermore, in the monitoring system 70 of this embodiment, when the information transmitted from the sensor 40 includes tilt information, the tilt information is converted by the server 80 into the weight of the measurement object 100 and can be viewed. This makes it possible to remotely check (monitor) the state (weight) of the measurement object 100.

[0061] Furthermore, in the monitoring system 70 of this embodiment, if the weight of the object to be measured, converted from the tilt information, changes beyond a predetermined range within a specified time, the external terminal 90 is notified of the sudden weight change via the communication network, so that a user of the external terminal 90 can grasp the sudden weight change of the object to be measured 100 even when not accessing the communication network.

[0062] (Other embodiments) Although the sensor device 20 of the above-described embodiment includes the bracket 22 and the sensor 40, the present disclosure is not limited to this configuration. For example, the sensor device 20 may include the bracket 22, the sensor 40, and the spring balance 50. In this case, too, the same effects as those of the above-described embodiment can be obtained.

[0063] In the sensor device 20 of the above embodiment, the bracket 22 is attached to the spring balance 50, but the present disclosure is not limited to this configuration. For example, instead of the spring balance 50, a configuration may be adopted in which the first connecting part 24 is connected to the suspension base side of the coil spring and the second connecting part 30 is connected to the suspension end side, or a configuration may be adopted in which the first connecting part 24 is connected to the suspension base side of a case 54 without a scale that houses the coil spring and the second connecting part 30 is connected to the suspension end side. Even in this case, the state of the measurement object 100 can be confirmed remotely by transmitting tilt information from the sensor 40.

[0064] In the sensor device 20 of the above embodiment, the tilt information is transmitted wirelessly from the sensor 40, but the present disclosure is not limited to this configuration. The tilt information may be transmitted from the sensor 40 via a wired connection. Even in this case, the state of the measurement target 100 can be confirmed remotely by transmitting the tilt information from the sensor 40.

[0065] In the monitoring system 70 of the above embodiment, if there is a sudden change in weight, a notification is sent to the external terminal 90. However, the monitoring system 70 may be configured to notify the external terminal 90 also if the temperature information exceeds a predetermined temperature.

[0066] While one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above, and it goes without saying that the present disclosure can be implemented in various other modified forms without departing from the spirit and scope of the present disclosure. [Explanation of symbols]

[0067] 20 Sensor device 26 Sensor mounting part (an example of a moving body) 28 Arm 40 Sensors 50 Spring balance (an example of a spring component) 54 cases 70 Surveillance System 80 Server (Example of a viewing method) 90 External Terminal 100 Measurement object

Claims

1. a moving body that changes its posture when a spring member from which a measurement target object having a changing moisture content is suspended contracts; a sensor that detects a change in the attitude of the moving body and transmits detection information; A sensor device comprising:

2. The movable body is supported at one end thereof so as to be tiltable on the suspension base side of the spring member, and at the other end thereof so as to be tiltable on an arm rotatably connected to the suspension tip side of the spring member, The sensor device according to claim 1 , wherein the sensor is fixed to the moving body and transmits tilt information of the moving body.

3. The spring member includes a coil spring and a case that houses the coil spring. The sensor device according to claim 2 , wherein one end of the movable body is rotatably supported on an upper end of the case.

4. The sensor device according to claim 1 , wherein the sensor has a function of detecting brightness and transmitting illuminance information.

5. The sensor device according to claim 1 , wherein the sensor has a function of detecting temperature and humidity and transmitting temperature and humidity information.

6. a spring member on which a measurement target object having a variable moisture content is suspended; a moving body that changes its posture when the spring member is compressed; a sensor that detects a change in the attitude of the moving body and transmits detection information; A sensor device comprising:

7. A sensor device according to any one of claims 1 to 6, a viewing means for receiving information transmitted from a sensor of the sensor device via a communication network and making the received information viewable on the communication network; A surveillance system comprising:

8. 8. The monitoring system according to claim 7, wherein, when the information transmitted from the sensor device includes tilt information of the moving body, the viewing means converts the tilt information into a weight of the object to be measured and makes the converted tilt information viewable.

9. The monitoring system according to claim 8, wherein the viewing means notifies an external terminal via a communication network that a sudden weight change has occurred if the weight of the object to be measured converted from the tilt information changes beyond a predetermined range within a specified time.

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