WO2022270547A1

WO2022270547A1 - Monitoring device

Info

Publication number: WO2022270547A1
Application number: PCT/JP2022/024929
Authority: WO
Inventors: 義浩奥山; 健夫芝; 静士時任
Original assignee: 国立大学法人山形大学
Priority date: 2021-06-25
Filing date: 2022-06-22
Publication date: 2022-12-29
Also published as: JP2023004134A

Abstract

In a conventional logistics management system, a sensor tag is required to include a battery of large capacity for long-wave transmission. As a result, the sensor tag cannot be small. In addition, it is required to provide a relay or a communication terminal in a cargo truck. In addition, a measurement value in a place without a communication terminal cannot be transmitted to a central station during load transfer or the like.　The monitoring device comprises a communication unit, a measurement unit, a power supply battery which supplies power to the communication unit and the measurement unit, and a wakeup unit which is not supplied with the power from the power battery. In addition, the wakeup unit identifies a wireless base station by means of radiowave power obtained from a radiowave and outputs an interrupt signal to the communication unit, the measurement unit performs measurement by means of a sensor and stores measurement data, and the communication unit wakes up from a deep sleep mode due to the interruption signal and wirelessly transmits the measurement data stored in the measurement unit to the wireless base station or another wireless base station.

Description

monitoring device

The present invention relates to a distribution monitoring device that is attached to an article and stores the environment in which the article is placed during distribution, and a monitoring device such as a wearable monitoring device.

Brewed alcoholic beverages such as fruit wine and Japanese sake are prone to deterioration due to temperature, so it is desirable to transport and store them under temperature control. Quality deterioration may occur if temperature is not controlled during transportation and storage. If such deterioration in quality occurs, the evaluation of the product, store, etc. will be lowered when the product is consumed at a restaurant or at home after being sold. Adverse effects due to temperature anomalies are not limited to brewed alcoholic beverages, but also occur in the transportation of other foods, agricultural products, human body tissues, and the like. In addition to the abnormal temperature, abnormalities such as acceleration such as impact and vibration, and humidity also cause deterioration in the quality of the article.

JP 2006-232417 A

Patent Document 1 describes a distribution management system capable of recording information on the state of each item. In this physical distribution system, articles are stored in a refrigerator of a freight truck and transported, and each article is packaged with a sensor tag. The sensor tag transmits temperature readings over long waves, which are sent via a repeater located in the cold store to a communication terminal outside the cold store on the freight truck. In the communication terminal, the measured temperature values and the time of measurement are stored, and the measured values and the like are sent to the central station via wireless communication for management.

However, wireless transmission generally requires a large amount of power. In the physical distribution management system of Patent Document 1, the sensor tag needs to be equipped with a large-capacity battery in order to perform long-wave transmission. Therefore, the size of the sensor tag cannot be reduced. Further, in the physical distribution management system of Patent Document 1, it is necessary to provide a repeater, a communication terminal, and the like on the freight truck. Furthermore, while the memory of the communication terminal stores temperature readings, sensor tags do not store temperature readings, and measurements at locations where there is no communication terminal, such as during transshipment, cannot be sent to the central station. Although this sensor tag is used for physical distribution, the same can be said for monitoring devices other than physical distribution. The present invention solves the above problems.

A monitoring device according to the present invention includes a communication unit, a measurement unit, a power supply battery that supplies power to the communication unit and the measurement unit, and a wakeup unit that is not supplied with power from the power supply battery, and the wakeup unit identifies a wireless base station by radio wave power obtained from the radio wave and outputs an interrupt signal to the communication unit; the measurement unit performs measurement using a sensor and stores measurement data; Waking up from the deep sleep mode by an interrupt signal, wirelessly transmits the measurement data stored in the measurement unit to the wireless base station or another wireless base station.

FIG. 1 illustrates one embodiment of a device for monitoring; The figure which shows the physical distribution system using a sensor tag. The figure which shows the block structure of the sensor tag in one embodiment. 4A and 4B are diagrams showing the operation of the circuit according to the first embodiment; FIG. FIG. 10 is a diagram showing the operation of the circuit in Example 2; FIG. 10 is a diagram showing the operation of the circuit in Example 3; The figure which shows the block structure of the sensor tag in other embodiment.

A monitoring device according to an embodiment of the present invention is used for distribution, and is attached to articles to be distributed or stored. As one embodiment of a device for monitoring, a flexible sensor tag 1 is shown in FIG. The sensor tag 1 is in the form of a sheet and can be attached to a bottle or the like having a curved surface. As shown in FIG. 1, electronic paper is provided on which the date and time when distribution or storage was started, the destination, a two-dimensional bar code, and the like are displayed. On the back side of the electronic paper, a communication circuit block 11, a measurement circuit block 12 including a sensor, a first control circuit block 13 including a first CPU, a thin power battery 15, a passive WUP circuit block 16, etc. are provided. It is A flexible wiring board or the like is used for these circuits, and they have flexibility as a whole. Therefore, it can be attached to a curved surface such as a bottle.

The sensor tag 1 is attached to an article 2 as shown in FIG. 2 and distributed and stored. In FIG. 2, the sensor tag 1 is shown attached to articles 2 such as a bottle and a box. When distribution or storage is started, the destination, start date and time, etc. are input to the sensor tag 1 and displayed as shown in FIG. Then, the sensor tag 1 is attached to the article 2 by sticking. Articles 2 to which sensor tags 1 are attached are refrigerated by refrigerated trucks 3, which are transportation equipment, and are transported to distribution facilities 4 at various locations. The distribution facility 4 is provided with one or more gateways 41 (G/W), which are wireless base stations. Each gateway 41 is connected to the Internet 5 via a router 42 . And it is connected to the server 6 .

When the article 2 enters the distribution facility 4 and the sensor tag 1 enters the transmission/reception range of the gateway 41, wireless communication is performed between the sensor tag 1 and the gateway 41. Then, the information is transmitted from the gateway 41 to the server 6 via the router 42 and the Internet 5 . The server 6 stores information such as temperature obtained from the sensor tag 1, and can transmit the information by accessing from the outside. The physical distribution facility 4 may be a receiving facility such as a store for the goods 2, or may be a physical distribution relay facility, a drive-in, a parking area, or the like.

A sensor tag 1, which is an embodiment of the present application, has a block configuration shown in FIG. The communication circuit block 11 is provided with a transceiver and an antenna for communicating with the gateway 41 . The measurement circuit block 12 also includes sensors for detecting information that needs to be managed in physical distribution, such as temperature sensors and impact sensors, and amplifiers for performing necessary processing on the signals detected by these sensors. , an A/D converter, etc. are provided. A first control circuit block 13 is provided to control the communication circuit block 11 and the measurement circuit block 12 . The first control circuit block 13 is provided with a first CPU, a first memory, and a counter. The communication circuit block 11 , the measurement circuit block 12 and the first control circuit block 13 are operated by power from the main power supply circuit block 14 . The main power supply circuit block 14 is provided with a voltage step-up/down circuit and a power supply stabilizing circuit. Power for the main power circuit block 14 is supplied from a power battery 15 . The power battery 15 is a chemical battery. Although not shown in FIG. 3, the first control circuit block 13 and the main power circuit block 14 are connected to the electronic paper device.

The first control circuit block 13 is connected to the second control circuit block 161 of the passive WUP circuit block 16. The passive WUP circuit block 16 basically does not obtain power from the power supply battery 15, but operates on power obtained from radio waves. The passive WUP circuit block 16 has a second control circuit block 161 and a wireless power supply circuit block 162 . The second control circuit block 161 has a demodulation/decoding circuit, a second CPU, and a second memory, and the wireless power supply circuit block 162 has an antenna, a rectifying/smoothing circuit, a booster circuit, and a power stabilizing circuit. In this embodiment, the antenna of the wireless power supply circuit block 162 and the antenna of the communication circuit block 11 are provided separately, but if the frequencies to be used are close, the antennas can be shared and switched by a switch.

The first memory of the first control circuit block 13 and the second memory of the second control circuit block 161 store base station IDs corresponding to a plurality of gateways 41 with which the sensor tag 1 can transmit and receive. Then, if the base station ID included in the connection request signal (advertising signal) of the gateway 41 is stored in the second memory, the INT signal (interrupt signal) is sent to the first control circuit block 13 . The wireless power supply circuit block 162 converts radio wave power of radio waves generated by the gateway 41 and supplies power to the second control circuit block 161 . If the base station ID included in the connection request signal of gateway 41 is stored in the first memory, measurement data can be transmitted via that gateway 41 .

With the sensor tag 1 attached to the article 2, temperature measurement by a temperature sensor is performed as a periodic measurement target, and acceleration measurement is performed by an impact sensor as an event-driven measurement target. In the flow of the measurement unit shown in FIG. 4, the temperature sensor, impact sensor, amplifier, A/D converter, etc. of the measurement circuit block 12 are controlled by the first control circuit block 13 to generate measurement data consisting of measurement values and measurement dates. Store in the first memory. Moreover, the sensor tag 1 is normally in a deep sleep mode (SLP), and the power consumption of the power supply battery 15 is suppressed.

The deep sleep mode (SLP) is a mode that reduces power consumption and makes the power supply battery 15 last longer. In this mode, the communication circuit block 11 is not operated. Therefore, the transmitter/receiver that consumes a large amount of power is stopped. The measurement circuit block 12 consumes only minimal power. Although power is supplied to the first control circuit block 13, only a circuit for measuring time, such as a counter, is operated, so the power consumption is the lowest.

In wake-up mode (WUP), each block operates normally, but power consumption is high. In this mode, power is supplied to the communication circuit block 11 and the measurement circuit block 12, and the transceiver, amplifier, A/D converter, etc. are operated. The semi-wakeup mode (SWUP) is a mode with slightly lower power consumption. In this mode, the communication circuit block 11 equipped with a transceiver that consumes a large amount of power is not operated. However, the measurement circuit block 12 is operated and the first CPU of the first control circuit block 13 operates at the normal clock frequency. The semi-wakeup mode (SWUP) consumes less power than the wakeup mode (WUP) and more power than the deep sleep mode (SLP).

In Example 1, the operation of temperature measurement is performed as follows. In the flow of the measurement section in FIG. 4, in step SM11, the first control circuit block 13 counts in the deep sleep mode (SLP). A counter forms a timer. Each time the timer indicates that a predetermined time has elapsed, the process proceeds to step SM12. In step SM12, the deep sleep mode (SLP) is switched to the semi-wakeup mode (SWUP). Next, in step SM13, the power-supplied measurement circuit block 12 amplifies the output of the temperature sensor and performs A/D conversion. Then, in the first control circuit block 13, the temperature measurement value is stored in the first memory together with the date and time of measurement. Thereafter, at step SM14, the process returns to the deep sleep mode (SLP) again.

Also, the impact measurement operation is performed as follows. In the flow of the measuring unit in FIG. 4, when the impact sensor detects acceleration of a predetermined value or more in step SM11 of the deep sleep mode (SLP), the process proceeds to step SM12 in an event-driven manner. In step SM12, the deep sleep mode (SLP) is switched to the semi-wakeup mode (SWUP). Next, in step SM13, the first control circuit block 13 stores the impact (acceleration greater than or equal to a predetermined value) and the date and time of the impact detection in the first memory. Then, in step SM14, it returns to the deep sleep mode (SLP) again.

In this way, the first memory of the first control circuit block 13 stores the temperature at predetermined time intervals together with the date and time of measurement. The date and time of detection are stored together.

Next, the situation in which the measurement data stored in the first memory is transmitted to the server 6 in the first embodiment will be described. When the sensor tag 1 shown in FIG. 2 enters the distribution facility 4 in the process of distribution or storage and the passive WUP circuit block 16 receives radio waves from the gateway 41, as shown in the wakeup section of FIG. Power supply starts. Radio waves are converted into electric power by the wireless power supply circuit block 162 shown in FIG.

At step SW12, the G/W signal (gateway signal) is received by the connection request signal issued by the gateway 41. The G/W signal contains a unique base station ID for each gateway 41, which is a radio base station. In the second control circuit block 161, at step SW13, it is collated with the base station ID stored in the second memory. If it is identified as the base station ID stored in the second memory, an INT signal (interrupt signal) is transmitted to the communication section in step SW14. In steps SW12 and SW13, G/W signal reception and G/W signal identification are repeated until the base station ID stored in the second memory is identified. In this way, the sensor tag 1 detects the approach of the gateway 41 capable of transmitting measurement data without consuming the power of the power supply battery 15 .

Upon receiving the INT signal from the wakeup section, the communication section shifts from the deep sleep mode (SLP) to the semi-wakeup mode (SWUP) in step SC11. Therefore, the power consumption is suppressed by setting the deep sleep mode (SLP) except during measurement until the data can be transmitted to the gateway 41 . Then, in step SC12, the presence or absence of measurement data in the first memory of the first control circuit block 13 is confirmed. In the quasi-wakeup mode (SWUP), the communication circuit block 11 does not operate and therefore does not consume power, but the first control circuit block 13 operates normally. If there is no measurement data in the first memory, the process returns to the deep sleep mode (SLP) at step SC17. On the other hand, if there is measurement data in the first memory, the process shifts to wakeup mode (WUP) in step SC13.

In the wake-up mode (WUP), power is supplied to the communication circuit block 11 to enable wireless communication. Then, in step SC14, it is determined whether or not the base station ID of the received G/W signal is stored in the first memory. If the received base station ID is not in the first memory, the process returns to the deep sleep mode (SLP) at step SC17.

If the base station ID of the G/W signal is in the first memory in step SC14, the measurement data in the first memory is sent to the G/W (gateway 41) together with the tag ID, which is a code unique to the sensor tag 1, in step SC15. wirelessly to Then, in step SC16, the measurement data stored in the first memory is erased, and in step SC17, the deep sleep mode (SLP) is entered.

When the sensor tag 1 moves through the logistics facility 4 shown in FIG. 2, the gateway 41 received during wake-up and the gateway 41 during communication may differ. The base station ID is separately identified in the flow of the wakeup part and the flow of the communication part. Therefore, even if the gateways 41 are different as described above, wireless transmission of measurement data and the like can be performed without any problem.

In Embodiment 1, the first CPU of the first control circuit block 13 is used for both the flow of the measurement unit and the flow of the communication unit in FIG. When the INT signal is transmitted while the flow of the measurement section is being executed, the flow of the communication section is not performed until the flow of the measurement section goes to step SM14 and enters the deep sleep mode (SLP). Further, when the flow of the measurement unit starts to operate due to a timer or event drive while the flow of the communication unit is being executed, the flow of the communication unit is stopped and the flow of the measurement unit is performed. However, the process is not stopped between steps SC15 and SC16. If the communication unit receives the INT signal when the flow of the measurement unit reaches step SM14, the process starts from step SC11. The flow of the measurement part takes precedence over the flow of the communication part.

The measurement data and tag IDs transmitted as described above are sent from the gateway 41 to the server 6 via the Internet 5 and stored. The tag ID of the sensor tag 1 is displayed on the electronic paper of the sensor tag 1 as a two-dimensional bar code as shown in FIG. Therefore, by loading the displayed two-dimensional bar code into the terminal and accessing the server 6, the history of temperature and impact can be viewed. Then, when quality deterioration occurs in the article 2, it is possible to evaluate in which process, such as transportation or storage, the abnormal temperature or shock occurred from the date and time of the measurement data, and to improve the process. In addition, from the measurement data of a plurality of sensor tags 1 accumulated in the server 6, it is possible to grasp the overall distribution situation and analyze the problem.

Immediately after step SC16, a step of returning to step SC12 after switching to a quasi-wakeup mode (SWUP) may be provided when the G/W signal is received. In this step, if the G/W signal has not been received or the received base station ID is not stored in the first memory, the process shifts to deep sleep mode (SLP) in step SC17. By doing so, the frequency of deep sleep mode (SLP) can be reduced.

As described above, the operation of the CPU is set to the deep sleep mode (SLP) mode when measurement and communication are not required, the sensor is used for intermittent measurement and event-driven type, and the operation mode of the processor driving the electronic paper is rewritten. By setting the deep sleep mode (SLP) to non-time, the power consumption of the sensor tag 1 as a whole can be reduced, and the duration of the thin power supply battery 15 can be greatly extended.

In the second embodiment, the operations of temperature measurement and impact measurement are performed in the same manner as steps SM11 to SM13 in the first embodiment, as shown in steps SM21 to SM23 in the flow of the measurement unit in FIG. However, in step SM24 of the second embodiment, it is determined whether there is an INT signal by step SW24 in the flow of the wakeup section. If there is no INT signal, it returns to the deep sleep mode (SLP) at step SM26. If there is an INT signal, a wake-up (WUP) request is made to the communication section in step SM25. Then, in step SM26, it returns to the deep sleep mode (SLP). Steps SW21 to SW24, which are the operations of the wakeup section, are the same as steps SW11 to SW14 in the first embodiment.

In the second embodiment, in step SC21 in the communication unit, when both the INT signal from the wakeup unit and the wakeup request (WUP request) from the measurement unit are present, the deep sleep mode (SLP) is switched to the wakeup mode. (WUP). Then, similarly to steps SC14 to SC17 of the first embodiment, after identifying the base station ID of the G/W signal in steps SC22 to SC25 and transmitting the measurement data in the memory and the tag ID to the gateway 41 (G/W), Erase the measurement data and return to deep sleep mode (SLP).

Also in the second embodiment, the first CPU of the first control circuit block 13 is used for both the flow of the measurement unit and the flow of the communication unit in FIG. In the temperature measurement by the timer, the flow of the communication section starts after a WUP request is issued in step SM24 of the measurement section. It is unlikely that an impact will occur during execution of the flow of the measurement part or the communication part and it will be event-driven.

In the second embodiment, when the measurement data is stored in the first memory in step SM23, the INT signal is identified in step SM24, and if there is an INT signal, a WUP request is made in step SM25. Thereby, it is possible to shift to the wakeup mode (WUP) at the timing of the measurement and transmit the measurement data to the gateway 41 . Therefore, if it is possible to send the measurement data, the measurement data is promptly sent. As a result, for example, when there is a temperature rise while the goods 2 are being stored in the distribution facility 4, the temperature rise is promptly transmitted, and it is possible to respond early.

In Example 3, the operations of temperature measurement and impact measurement are performed in the same manner as steps SM11 to SM14 in Example 1, as shown in steps SM31 to SM34 in the flow of the measurement unit in FIG. Steps SW31 to SW34, which are the operations of the wakeup section, are also the same as steps SW11 to SW14 in the first embodiment.

In the third embodiment, the communication unit receives the INT signal from the wakeup unit and shifts from deep sleep mode (SLP) to wakeup mode (WUP) in step SC31. In wakeup mode (WUP), power is supplied to the communication circuit block 11 . Then, in step SC32, it is determined whether or not the base station ID stored in the first memory is present in the G/W signal of the received radio wave. If there is no such G/W signal, it returns to the deep sleep mode (SLP) at step SC37 and waits for an INT signal at step SC31.

If there is such a G/W signal, the presence or absence of measurement data in the first memory of the first control circuit block 13 is checked in step SC33. If there is no measurement data in the first memory, the process proceeds to step SC36. On the other hand, if there is measurement data in the first memory, in step SC34 the measurement data in the first memory and the tag ID are transmitted to the gateway 41 (G/W) of the base station ID identified in step SC32. After that, in step SC35, the measurement data is erased from the first memory, and the process proceeds to step SC36.

In step SC36, the mode shifts to the deep sleep mode (SLP), and when the timer by the counter of the first control circuit block 13 elapses for a predetermined time, the mode shifts to the wakeup mode (WUP) again. Then, the process returns to step SC32 to identify the G/W signal. By step SC36, the power consumption of the power supply battery 15 can be suppressed by repeating the deep sleep mode (SLP) and the wakeup mode (WUP) at predetermined time intervals while the G/W signal is present.

　There is a possibility that the measurement data is stored in the first memory while in the deep sleep mode (SLP) for a predetermined period of time in step SC36. However, when the sensor tag 1 moves after a predetermined period of time and the G/W signal having the base station ID stored in the first memory cannot be recognized, step SC32 returns to the deep sleep mode (SLP) of step SC37. Then, it waits for the next INT signal. On the other hand, when the sensor tag 1 does not move much and wireless transmission is possible, if the measurement data and the tag ID are stored in the first memory, they are wirelessly transmitted to the gateway 41 . The predetermined time in step SC36 is preferably longer than the temperature measurement interval in step SM31.

Also in Example 3, the first CPU of the first control circuit block 13 is used for both the flow of the measurement unit and the flow of the communication unit in FIG. In the third embodiment, while the deep sleep mode (SLP) is set in step SC36, the measurement data is stored in the first memory by shifting to the quasi-wakeup mode (SWUP) by the timer of the measurement unit or event driven. be. It is unlikely that the measurement unit will start to operate at a timing other than step SC36 of the communication unit flow.

<Other embodiments>
Examples 1 to 3 are examples using the block configuration of the sensor tag 1 in one embodiment shown in FIG. 2, but the block configuration of the sensor tag in another embodiment shown in FIG. 7 may be used. In FIG. 7, the passive WUP circuit block 16 is provided with a secondary battery 164 . The secondary battery 164 is charged with power obtained from the wireless power supply circuit block 163, and is supplied to the second control circuit block 161 via the wireless power supply circuit block 163 when radio waves weaken. The secondary battery 164 is provided so that the wireless power supply circuit block 163 can stably supply power until the second control circuit block 161 sends out the INT signal. Therefore, long-term power supply may not be performed, and a capacitor may be used for the secondary battery 164 .

In Examples 1 to 3, the measurement data in the first memory is deleted after being transmitted. However, it is also possible to set a transmitted flag without erasing the data so that the data will not be transmitted in subsequent transmissions. Alternatively, all measurement data may be transmitted each time without being erased.

Also, the wireless power supply circuit block 163 shown in FIG. 7 is connected to the power supply battery 15 . The wireless power supply circuit block 163 supplies surplus power obtained from radio waves to the power supply battery 15 to charge it. The power battery 15 is a secondary battery of a chemical battery. Only one of the configuration in which the power supply battery 15 is charged from the wireless power supply circuit block 163 and the configuration in which the secondary battery 164 is provided may be provided.

Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like are made within the scope of the present invention. is included in the present invention. In addition, each of the above-described embodiments can be combined by utilizing each other's techniques unless there is a particular contradiction or problem in the purpose, configuration, or the like.

For example, in Examples 1 to 3, base station IDs of a plurality of gateways 41 accessible by the sensor tag 1 are stored in the first memory and the second memory. However, the accessible gateway 41 may change at any time due to installation or removal. Therefore, the base station IDs of a plurality of accessible gateways 41 can be stored in the server 6, updated and managed, and transmitted to the sensor tag 1. FIG. In this case, when the first control circuit block 13 of the sensor tag 1 accesses the server 6 via the gateway 41, the updated accessible base station ID is downloaded from the server 6 and updated.

In addition, although one first CPU is used for the communication unit and the measurement unit in Examples 1 to 3, the communication circuit block 11 and the measurement circuit block 12 may be provided with separate CPUs or the like. Also, although gateways are used as radio base stations, radio base stations other than gateways may be used. If there is only one gateway 41, the router 42 may be omitted.

In one embodiment and another embodiment, as shown in FIG. 1, the date and time when distribution or storage started, the destination, a two-dimensional barcode, etc. are displayed on electronic paper. However, part or all of the display surface may be printed. Also, when using a display, the maximum temperature, the presence or absence of impact, etc. during distribution or storage may be displayed.

The above-described examples and embodiments are intended for physical distribution, and are used by attaching sensor tags to articles. However, the sensor tag may be attached to a person and used as a wearable sensor. For example, wearable vital sensors such as body temperature, pulse, pulse wave (ECG (electrocardiogram), PPG (optical heart rate sensor), etc.), SpO ₂ (blood oxygen concentration), blood pressure, etc. are acquired, and the acquired data is sent to the server through the gateway. etc., can be considered. Moreover, it may be used as a sensor tag for radiation measurement in the form of a name tag, and used to measure the radiation dose when a worker at a nuclear power plant works. In this case, the radiation dose can be detected and stored in the sensor tag together with the measurement time, and the radiation data can be retrieved by a gateway provided in a dressing room or the like. By analyzing the radiation data of each individual worker together with the work diary that describes the work for each hour, it is possible to investigate the work place and work content with high radioactivity.

1 sensor tag 11 communication circuit block 12 measurement circuit block 13 first control circuit block 14 main power circuit block 15 power battery 16 passive WUP circuit block 161 second control circuit block 162 wireless power supply circuit block 163 wireless power supply circuit block 164 secondary battery 2 Goods 3 Refrigerated truck 4 Logistics facility 41 Gateway 42 Router 5 Internet 6 Server

Claims

A communication unit, a measurement unit, a power supply battery that supplies power to the communication unit and the measurement unit, and a wakeup unit that is not supplied with power from the power supply battery,
The wakeup unit identifies a wireless base station by radio wave power obtained from radio waves and outputs an interrupt signal to the communication unit;
The measurement unit performs measurement with a sensor and stores measurement data,
For monitoring, wherein the communication unit wakes up from a deep sleep mode by the interrupt signal and wirelessly transmits the measurement data stored in the measurement unit to the wireless base station or another wireless base station. device.
The monitoring device according to claim 1, wherein the power battery is charged by radio wave power of the wakeup unit.
The monitoring device according to claim 1 or 2, wherein the communication unit switches to a deep sleep mode when connection to the wireless base station or the other wireless base station becomes impossible.
The monitoring device according to any one of claims 1 to 3, wherein the communication unit repeats a deep sleep mode and a wakeup mode at predetermined time intervals after waking up.
5. The apparatus according to any one of claims 1 to 4, wherein a secondary battery different from the power supply battery is charged with the radio wave power, and power is supplied from the secondary battery to the wakeup unit. monitoring device.
6. The apparatus according to any one of claims 1 to 5, wherein the wakeup unit stores a base station ID of the radio base station, and identifies the radio base station by the stored base station ID. monitoring device.