JP7213784B2 - Refrigerator and food management system - Google Patents

Description

The present invention relates to refrigerators.

Refrigerators have been proposed for managing food in storage compartments. In such a refrigerator, it is possible to check the storage status in the storage chamber photographed by a camera on a terminal such as a smartphone via a network. Further, as a means other than the camera used for managing the state of storage in the storage room, an RFID reader for reading the RFID tag attached to the food is known. For example, in Patent Document 1, "A storage for storing articles to which a wireless tag is attached, an antenna that radiates radio waves into the storage body and wirelessly communicates with the wireless tag, and the wireless from the antenna. A wireless tag reader that reads wireless tag information stored in a tag, and a radio wave state changer that covers the entire inside of the storage main body as a readable area for the wireless tag by changing the radio wave state inside the storage main body. and control means for processing wireless tag information read from the wireless tag in the storage body" (Claim 1 of the same document).

JP 2009-250480 A

The conventional refrigerators described in Patent Document 1 and the like are all for detecting food stored inside the refrigerator and managing the food in the refrigerator. However, in reality, food is placed in places other than the refrigerator, and there is a possibility that such food will be purchased redundantly. In addition, with the above-described conventional refrigerator, it is not possible to manage whether or not the stock of food placed in places other than the refrigerator has run out.

SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigerator capable of managing food placed outside the refrigerator.

In order to solve the above problems, the present invention provides a refrigerator comprising a storage compartment, a food sensor for detecting food, and a communication module for transmitting information on the food detected by the food sensor to outside the refrigerator, The food sensor is an array antenna that wirelessly communicates with an RFID tag attached to food, and the directivity of the array antenna is switched between when detecting food outside the refrigerator and when detecting food inside the refrigerator. characterized by

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the refrigerator which can manage the foodstuffs put outside the refrigerator.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the refrigerator which concerns on Example 1 of this invention. 1 is a block diagram showing an electrical configuration of a refrigerator according to Example 1; FIG. 3 is a block diagram showing the configuration of an antenna and an RFID reader in the refrigerator according to Example 1. FIG. 1 is a diagram showing the overall configuration of a food management system according to Example 1; FIG. 4 is a flow chart showing an operation of reading food in the refrigerator according to the first embodiment; FIG. 10 is a diagram showing a screen when application software is started on the mobile terminal;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the basic configuration of the refrigerator will be described.

<Basic configuration of refrigerator>
FIG. 1 is a perspective view of a refrigerator 1 of Example 1 of the present invention. As shown in FIG. 1, the refrigerator 1 of this embodiment includes a heat-insulating box body, a plurality of storage compartments partitioned by the heat-insulating box body, and a storage compartment door that opens and closes the front side of each storage compartment. ing.

The heat insulating box is formed by filling a metal outer box, a resin inner box, and a vacuum heat insulating material and a foam heat insulating material between the outer box and the inner box. The storage compartments are composed of a refrigerating compartment from above, an ice making compartment, an upper freezer compartment, a lower freezer compartment, and a vegetable compartment arranged side by side. The upper freezer compartment, the lower freezer compartment, and the vegetable compartment may be switchable compartments that can be switched from the freezing temperature range to the refrigerating temperature range as necessary. Of the doors at the openings of the storage compartments, the refrigerating compartment door 2 is a left and right split rotary door, and the doors of the other storage compartments are drawer-type doors.

The door of each storage room consists of a glass outer panel provided on the surface, a door frame provided on the periphery of the outer panel, a vacuum insulation material arranged on the back surface of the outer panel, and the outer panel and the door frame. A foam heat insulating material focused on the space formed by and an inner plate provided on the back surface of the door frame. In particular, the refrigerator compartment door 2 is provided with an operation panel 12 for performing operations such as temperature setting inside the refrigerator.

In addition, although not shown, the refrigerator 1 has a cooler that generates cold air, a blower fan 18 that supplies the cold air to each storage compartment, and a damper 19 that adjusts the air volume to each storage compartment. are doing. Furthermore, in addition to the cooler, a refrigerating cycle is configured by a compressor 17 that compresses the refrigerant, a radiator that releases heat to the outside air, and a capillary tube that is a means for decompressing the refrigerant, and the refrigerant is circulated. Cool each storage compartment.

A recess 7 is formed on the rear side of the top surface of the heat insulating box, and the control board 8 and the communication module 9 are accommodated in this recess 7 . The communication module 9 is for the refrigerator 1 to communicate with the outside, and communicates with the router 24 by a wireless communication method such as wireless LAN or Bluetooth (registered trademark). The communication module 9 and the control board 8 are connected by a signal line, but since they are arranged in the same recess 7, the signal line can be short.

Furthermore, the refrigerator 1 of this embodiment has an internal antenna (first antenna) 10 on the top surface of the refrigerator compartment, and an external antenna (second antenna) 11 on the refrigerator compartment door 2 . These antennas communicate wirelessly with the RFID tag attached to the food, and based on the signals detected by these sensors, the RFID reader 14 reads various information stored in the RFID tag. In this embodiment, the 920 MHz band (so-called UHF band) is used as the frequency band of radio waves used for wireless communication with the RFID tag.

FIG. 2 is a block diagram showing the electrical configuration of the refrigerator 1 of this embodiment. As shown in FIG. 2, the control board 8 is provided with a main control unit (microcontroller) 13 that controls the entire refrigerator 1 and an RFID reader 14 that reads RFID tags.

The main control unit 13 receives input signals from the door sensor 15, the temperature sensor 16, the compressor 17, the blower fan 18, the damper 19, the operation panel 12, and the like. When the main control unit 13 receives an input signal from the temperature sensor 16, the main control unit 13 determines the rotational speed of the compressor 17 based on the temperature of the storage chamber detected by the temperature sensor 16. Send the output signal. In addition, the main control unit 13 turns ON/OFF the blower fan 18 and adjusts the opening of the damper 19 provided in the air passage based on the temperature of the storage room detected by the temperature sensor 16. signals to these. Furthermore, when receiving an input signal indicating that the door is open from the door sensor 15, the main control section 13 transmits an output signal to the operation panel 12 so as to display the fact. Further, when the main control unit 13 receives an input signal from the operation panel 12 and receives an input signal from the operation panel 12, the main control unit 13 outputs a signal to the compressor 17, the blower fan 18, the damper 19, or the like. to send. In addition, since the main control unit 13 is connected to the communication module 9, it is possible to receive information such as the temperature inside the storage compartment from outside the storage via the router 24 or the like.

FIG. 3 is a block diagram showing the configuration of an antenna that wirelessly communicates with an RFID tag, and an RFID reader 14 that reads information on the RFID tag from a signal detected by this antenna.

<Antenna>
First, the antenna will be explained. The inside-fridge antenna 10 and the outside-fridge antenna 11 are composed of array antennas whose directivity can be controlled. This array antenna has a plurality of antenna elements, and can control the direction in which radio waves are radiated by adjusting the amplitude ratio and phase difference of signals input to and output from each antenna element.

As shown in FIG. 3, the indoor antenna 10 and the outdoor antenna 11 of this embodiment include main antenna elements 10-0 and 11-0 and N subantenna elements 10-1 to 10-N and 11- 1 to 11-N, a variable attenuator 20, a variable phase shifter 21, and a power combiner/divider 22 having 1:N+1 ports. A feeding point connected to the main antenna element is connected to one of the ports distributed to a power combiner/divider 22 via a variable attenuator 20 and a variable phase shifter 21 . A feeding point connected to each subantenna element is connected to N ports distributed to the power combiner/divider 22 .

The variable attenuator 20 individually controls the feeding point voltage E1 of the main antenna elements, and the variable phase shifter 21 individually controls the phase of the main antenna elements. Therefore, by controlling the variable attenuator 20 and the variable phase shifter 21, the amplitude ratio (E1/E2) and the phase difference (φ ) can be adjusted. Since the amplitude ratio (E1/E2) and phase difference (φ) greatly affect the radiation characteristics, by appropriately adjusting these, it is possible to change the strength of directivity as needed. there is

The inside antenna 10 is arranged on the top surface of the refrigerator compartment and radiates radio waves inside the refrigerator compartment. Although the control board 8 and the communication module 9 described above are provided above the vacuum heat insulating material, the inside antenna 10 is provided below the vacuum heat insulating material. Therefore, the inside antenna 10 may be housed in the same case as the inside light. The inside antenna 10 is an array antenna having a microstrip antenna as an antenna element. Since the top surface of the refrigerating compartment has a relatively wide flat surface, a large number of antenna elements can be arranged on the substrate, making it possible to realize a high-performance array antenna.

The outside antenna 11 is arranged on the refrigerator compartment door 2 and radiates radio waves outside the refrigerator compartment. This outdoor antenna 11 is provided outside the vacuum insulation material. Therefore, the outside antenna 11 may be housed in the same case as the operation panel 12 . The outside antenna 11 is also an array antenna having a microstrip antenna as an antenna element. Since the refrigerator compartment door 2 has a relatively wide plane, a large number of antenna elements can be arranged on the substrate, and a high-performance array antenna can be realized.

<RFID reader>
Next, the configuration of the RFID reader 14 will be described. As shown in FIG. 3, the RFID reader 14 has a transmitter (circuit) 14a, a receiver (circuit) 14b, a circulator 14c, an RF controller 14d, a power supply 14e, and a switch 14f. It communicates with the RFID tag through the antenna.

Here, the transmitter 14a includes a power amplifier 14a1, and the output of the power amplifier 14a1 is input to the circulator 14c. The receiver 14b includes a BPF (band pass filter) 14b1 that limits the band of the received signal from the circulator 14c, and an LNA (low noise amplifier) 14b2 connected to the BPF 14b1. The circulator 14c guides a signal transmitted from the transmitter 14a to the antenna, and guides a signal received by the antenna from the RFID tag to the receiver 14b. The RF control unit 14d includes a signal processing unit 14d1 configured by a microprocessor or the like and controlling the operation of the transmitting unit 14a and the receiving unit 14b, and a memory 14d2 in which a predetermined program capable of executing reading processing etc. is stored in advance. Configured. The power supply unit 14e supplies power for operation to each unit, and the switch 14f switches between the first antenna and the second antenna.

Then, when the RFID reader 14 transmits radio waves through the transmitter 14a and the antenna and the radio waves are received by the RFID tag, the RFID tag transmits an RF response signal. This RF response signal is received by the receiver 14b of the RFID reader 14, and the food information read by the signal processor 14d1 is stored in the memory 14d2. Although the RFID reader 14 of this embodiment is provided on the control board 8 common to the main control unit 13 that controls the entire refrigerator 1, it is provided on a board different from the control board 8 of the main control unit 13. You can set it.

<Food management system>
Next, a food management system using the refrigerator 1 described above will be described. FIG. 4 is a diagram showing the overall configuration of the food management system according to this embodiment. In the food management system, the state of food in the refrigerator 1 can be confirmed by a display device such as the mobile terminal 26. FIG. As shown in FIG. 4, the food management system includes a refrigerator 1, a mobile terminal 26, a router 24, a network 25 such as the Internet, and a server 27.

≪Refrigerator≫
A refrigerator 1 is placed in a kitchen in a house 23 and has a communication module 9 mounted thereon. This communication module 9 is connected to a network 25 via a router 24 inside a residence 23 . The communication module 9 then transmits its own identification information and food information read by the RFID reader 14 to the router 24 . Note that the communication module 9 may be directly connected to the network 25 without going through the router 24, or may be wired instead of wireless.

≪Display device≫
The display device is a device that displays the status of food inside and outside the refrigerator 1, and may be a display terminal connected to the router 24 via a wireless LAN or the like, or a display unit provided on the door of the refrigerator 1 or the like. good. In this embodiment, a mobile terminal 26 such as a smart phone will be described as an example. The mobile terminal 26 can be connected to the network 25 via the router 24 or directly connected to the network 25 without the router 24 . Alternatively, it may be directly connected to the communication module 9 of the refrigerator 1 via Bluetooth (registered trademark) or the like.

Further, dedicated application software for managing food inside and outside the refrigerator 1 is installed in the portable terminal 26, and information on food inside and outside the refrigerator 1 can be displayed by starting this application. The application software may be downloaded and updated from the server 27 accessed via the home page of the refrigerator manufacturer.

≪Server≫
The server 27 is connected to the mobile terminal 26 and the refrigerator 1 via the network 25 . The server 27 also has a database that stores food information read by the RFID reader 14 of the refrigerator 1 . When the server 27 accesses from the mobile terminal 26, it authenticates whether or not it matches the identification information registered in association with the refrigerator 1. If the authentication is performed normally, the mobile terminal 26 accesses the server 27 Allows you to connect to databases within When the server 27 receives an information call signal from the mobile terminal 26 , the server 27 transmits the food information stored in the database to the mobile terminal 26 . The server 27 may be constructed with a single computer, or may be a cloud type constructed with a large number of computer groups.

<Reading operation of RFID tag>
An operation of reading an RFID tag in the food management system of this embodiment will be described. FIG. 5 is a flow chart showing the operation of reading food inside and outside the refrigerator 1 . As shown in FIG. 5, first, when the door sensor 15 detects that the storage compartment door is closed (step S101), the RFID reader 14 switches the switch 14f to the inside antenna 10, After radiating radio waves from the refrigerator 1, an RF response signal is received from the RFID tag, and the RFID tag of the food in the refrigerator 1 is read (step S102). As long as the storeroom door is not opened and closed again, it is considered that no food will be put in or taken out of the refrigerator 1, so the reading of the RFID tag of the food in the refrigerator 1 is finished.

Next, the RFID reader 14 switches the switch 14f to the outside antenna 11, emits radio waves from the outside antenna 11, receives the RF response signal from the RFID tag, and detects the RFID tag of the food outside the refrigerator 1 such as the kitchen. is read (step S103). Here, in this embodiment, the RFID tag inside the refrigerator is read first in step S102, but the RFID tag outside the refrigerator may be read first. Further, these readings may be performed after a predetermined period of time has passed, instead of immediately after the storage chamber door is closed.

The amount of food outside the refrigerator 1 may increase or decrease regardless of whether the storage compartment door is opened or closed. Therefore, as in step S104, radio waves are radiated from the outside antenna 11 and the RFID tag outside the refrigerator is read every time a predetermined time (for example, 60 minutes) elapses. According to the present embodiment, it is possible to continuously grasp the increase/decrease in food while suppressing power consumption.

<RFID tag>
The RFID tag generates power from the energy of radio waves received from the RFID reader 14, and transmits the signalized information inside the tag as an RF response signal via its own antenna. The RFID tag contains food attribute information such as the type of food and the expiration/expiration date of the food, and this information is read by the RFID reader 14 . At this time, the RFID reader 14 can also read the location information of the RFID tag, that is, the information on the location where the food is placed. By controlling the directivity of the inside antenna 10 and the outside antenna 11 more finely, the position information of the RFID tag not only distinguishes between inside and outside of the refrigerator, but also which position inside the refrigerator. It is possible to distinguish and recognize any position outside the refrigerator. For example, inside the refrigerator compartment, you can distinguish between the chilled compartment, the vegetable compartment, the number of shelves in the refrigerator compartment, the front of the shelf, and the back of the shelf. can

<Database>
The food attribute information and position information read by the RFID reader 14 are transmitted to the server 27 via the communication module 9 and stored in the database in the server 27 in an organized state as food information. At this time, data communication traffic can be reduced by providing a bit string corresponding to each piece of food information in communication packets transmitted and received between communication module 9 (refrigerator 1) and server 27. FIG.

A database storing food information may be placed in the refrigerator 1 or a home server. When the database is placed in the refrigerator 1, a hard disk is provided side by side with the control board 8 in the recess 7 formed near the top surface of the heat insulating box, or a dedicated semiconductor memory is provided in the control board 8. can be considered.

<Application>
FIG. 6 is a diagram showing an example of a screen when predetermined application software related to food management is activated on the portable terminal 26. As shown in FIG. As shown in FIG. 6, two tabs, kitchen and refrigerator, are provided at the top of the screen. When the kitchen is selected, a list of foods outside the refrigerator 1 is displayed. The display order can be rearranged according to your preference, such as the order of foods that are about to expire/expiration date, or the order of newest foods registered in the app. For foods that are browsed for the first time, a display indicating that the food is new may be displayed, or an alert may be issued when a predetermined period of time has passed before the best-before/expiration date. An alert can also be issued when food to be stored in the refrigerator 1 is outside the refrigerator 1. - 特許庁

In FIG. 6, only the information on whether it is the kitchen or the refrigerator, that is, whether it is outside or inside the refrigerator 1 is displayed, but information such as where it is in the kitchen and which storage room in the refrigerator 1 is also required. You may enable it to display according to. Further, the functions provided by the application software of the present embodiment are not limited to such food browsing functions and alert functions. For example, a function of displaying recommended recipes among dishes that can be cooked with food inside and outside the refrigerator 1, and a function of automatically placing an order when the stock of food registered as a regular item is running low. can provide.

<Effects of this embodiment>
According to this embodiment, by using a refrigerator that is always on in the vicinity of the kitchen where food is often placed, it is possible to continuously detect food placed outside the refrigerator. It is possible to manage food in the entire vicinity of the kitchen. Therefore, it is possible to prevent duplicate purchases of foods that are not refrigerated/frozen, and to inform the user that stocks of regular supplies such as kitchen supplies have run out or decreased. In addition, since food information inside and outside the refrigerator is automatically stored in a database, it is possible to more accurately provide alerts and recipes regarding best-before/expiration dates. As a result, it not only improves usability for the user, but also reduces food loss.

As a food sensor for detecting food, in Example 1, an RFID reader antenna is used, but in Example 2, an RFID reader antenna and a camera are used together. A camera control device is mounted on the control board 8 of this embodiment together with the RFID reader 14 . This camera control device includes a signal processing section, a memory, a power supply section, and the like.

When a camera is used as a food sensor, data processing for image identification is required, so image analysis such as color correction, brightness correction, outline extraction, pattern recognition, etc. is performed in the signal processing unit. However, since data preprocessing may require large-scale data analysis, the signal processing unit uses, for example, a high-performance processor such as an MPU chip, FPGA, dedicated ASIC chip, GPU chip, or a combination thereof. .

The camera control device may be provided on a board different from the control board 8 of the main control unit 13 that controls the refrigerator 1 as a whole, or may be an information processing resource placed outside the refrigerator 1 . When performing data processing related to image identification using information resources outside the refrigerator 1, it is necessary to provide means for transmitting a relatively large amount of data before data processing. Therefore, it is desirable that the communication module 9 of the refrigerator 1 be capable of transmitting large amounts of data via a wireless LAN or the like. The information processing resource placed outside the refrigerator 1 may be a cloud-type server, a home server device, or the like.

In this embodiment, the outside food sensor is composed of an antenna, and the inside food sensor is composed of a camera. A camera serving as an internal food sensor is provided on the inner plate of the refrigerating compartment door 2 or on the rotating partition, so that when the refrigerating compartment door 2 is closed, a wide range can be photographed from the front to the rear of the refrigerating compartment. It's becoming In this embodiment, only the camera for photographing the interior of the refrigerator compartment is provided, but a camera for photographing the interior of other storage compartments such as the freezer compartment may also be provided. Moreover, both a camera and an antenna may be used as the food sensor for inside the refrigerator. Using a camera as in this embodiment makes it possible to read food that cannot be read with an RFID tag, such as food placed in the refrigerator 1 after cooking.

In addition, when food is placed in front of the refrigerator 1, the outside food sensor can also be a camera. In this case, it is preferable to detachably install a camera on the operation panel 12 of the refrigerating compartment door 2 or in front of the top surface of the heat insulating box. A plurality of cameras may be provided in the refrigerator 1 when the food outside the refrigerator 1 cannot be photographed by one camera. In addition to the visible light camera, the camera may be an infrared camera, a multispectral camera, a TOF camera, or the like.

It may be difficult to read the RFID tag of the food in the kitchen or the like only with the outside antenna 11 provided in the refrigerator 1 as in the first embodiment. For example, in a 920 MHz band RFID system, the distance at which RFID tags can be transmitted and received is about several meters to 10 meters. Moreover, the presence or absence of an electromagnetic obstacle such as a metal object or a human body also changes the reception characteristics. Therefore, in the third embodiment, an additional transmitting/receiving device (communication auxiliary device) is provided in cooperation with the refrigerator 1 to achieve more stable reading of food.

This communication assistance device comprises, for example, a signal processing unit, a memory, a power supply unit, an antenna, etc., and is installed at a position relatively distant from the refrigerator 1, preferably at a position with good visibility such as the ceiling. By installing this communication auxiliary device, it is possible to read the RFID tag of the food placed in the electromagnetically blind spot from the refrigerator 1 and transmit the data to the refrigerator 1 . If the food information database is provided in a home server or a cloud-type server, the food information read by the communication assistance device may be sent directly to the server without going through the refrigerator 1 . In this case, the food information read by the main body of the refrigerator 1 and the food information read by the communication auxiliary device are integrated on the server.

The present invention is not limited to the first to third embodiments described above, and includes various modifications. For example, the food sensor may be an RFID reader antenna that is radio wave means, a camera that is optical means, an ultrasonic sensor that is sonic means, or a sensor fusion that combines these. Further, although the 920 MHz band RFID system is used in the first embodiment, a 2.4 GHz band RFID system or a millimeter wave band radar system may be used.

The type and installation location of the antenna are not limited to the first to third embodiments described above. For example, instead of a microstrip antenna that requires a certain area, an array antenna using linear antennas as antenna elements may be used. In addition, installing an external antenna on the refrigerator compartment door may affect the design and insulation performance. It is possible to suppress deterioration of heat resistance and heat insulation performance.

Furthermore, without distinguishing between the outside antenna and the inside antenna, a common antenna may be used, and by switching the directivity of the antenna, reading from outside to inside may be performed. In addition, the RFID tag of the food inside the refrigerator (for example, the freezer compartment) is not read, and when the food is taken in and out of the refrigerator, the user can bring the food closer to the reading position of the outside antenna to read the food inside the refrigerator. can be managed.

The above-described first to third embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described above. It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

1 refrigerator 2 refrigerator compartment door 3 ice making compartment door 4 upper freezer compartment door 5 lower freezer compartment door 6 vegetable compartment door 7 recess 8 control board 9 communication module 10 internal antenna (first antenna)
11 Outside antenna (second antenna)
12 Operation panel 13 Main controller 14 RFID reader 14a Transmitter 14a1 Power amplifier 14b Receiver 14b1 BPF (band pass filter)
14b2 LNA (low noise amplifier)
14c circulator 14d RF control unit 14d1 signal processing unit 14d2 memory 14e power supply unit 14f switch 15 door sensor 16 temperature sensor 17 compressor 18 blower fan 19 damper 20 variable attenuator 21 variable phase shifter 22 power combiner/divider 23 residence 24 router 25 Network 26 Mobile terminal 27 Server

Claims (8)

A refrigerator comprising a storage compartment, a food sensor that detects food, and a communication module that transmits information on the food detected by the food sensor to outside the refrigerator,
The food sensor is an array antenna that wirelessly communicates with an RFID tag attached to food, and the directivity of the array antenna is switched between when detecting food outside the refrigerator and when detecting food inside the refrigerator. A refrigerator characterized by In the refrigerator according to claim 1,
The refrigerator, wherein the information transmitted by the communication module to the outside of the refrigerator includes information specifying whether the food is outside or inside the refrigerator. In the refrigerator according to claim 1,
The refrigerator, wherein the food sensor includes an inside food sensor and an outside food sensor . In the refrigerator according to claim 3,
The refrigerator, wherein the outside food sensor is an array antenna that wirelessly communicates with an RFID tag attached to the food . In the refrigerator according to claim 1,
The refrigerator, wherein the food sensor reads an RFID tag attached to the food outside the refrigerator every predetermined time . In the refrigerator according to claim 1,
A refrigerator according to claim 1, wherein said array antenna comprises a microstrip antenna as an element and is provided on a door of said storage compartment . In the refrigerator according to claim 1,
A refrigerator according to claim 1, wherein a camera for photographing the inside of said storage chamber is also used as said food sensor in addition to said array antenna when detecting food in said refrigerator . A refrigerator according to claim 1 and a communication auxiliary device,
The food management system, wherein the communication auxiliary device can read the RFID tag and transmit the read information to the refrigerator or the server .

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