Internet-of-things temperature and humidity recorder for cold chain

Abstract

The utility model relates to the technical field of temperature recorders, and discloses an internet-of-things temperature and humidity recorder for a cold chain. The device comprises a master control module, a display module, a temperature and humidity acquisition module, a communication module, a buzzing alarm module, a Bluetooth module and a USB module, wherein the display module is electrically connected with the master control module; the temperature and humidity acquisition module comprises an external temperature and humidity sensor and a built-in temperature and humidity sensor, the input end of the external temperature and humidity sensor is electrically connected with the main control module, and the input end of the built-in temperature and humidity sensor is electrically connected with the main control module; the communication module is electrically connected with the main control module; the buzzing alarm module is electrically connected with the main control module; the Bluetooth module is electrically connected with the main control module; and the USB module is electrically connected with the main control module. According to the invention, various high-performance functions can be provided, and the temperature and humidity data of the internal space of the cold chain device can be conveniently acquired, recorded, stored and output.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature and humidity recorders, and in particular to an Internet of Things temperature and humidity recorder used in a cold chain. Background Art

[0002] During the transportation of fresh produce, the temperature and humidity environment must be kept constant and low, which requires not only a powerful cold chain transport vehicle, but also the cooperation of the insulated box. The traditional method is to set a temperature and humidity recorder in the insulated box of the cold chain transport vehicle to obtain the temperature and humidity data in the insulated box from the temperature and humidity recorder, but the existing temperature and humidity recorders have fewer functions and lower functionality, and the existing temperature and humidity recorders no longer meet the current needs of the cold chain transportation process. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an IoT temperature and humidity recorder for cold chain, which has multiple functions and high performance, and can conveniently acquire, record, store and output the temperature and humidity data of the internal space of the cold chain device.

[0004] According to an embodiment of the utility model, an Internet of Things temperature and humidity recorder for cold chain includes a main control module, a display module, a temperature and humidity acquisition module, a communication module, a buzzer alarm module, a Bluetooth module, and a USB module. The display module is electrically connected to the main control module; the temperature and humidity acquisition module includes an external temperature and humidity sensor and a built-in temperature and humidity sensor, the output end of the external temperature and humidity sensor is electrically connected to the main control module, and the output end of the built-in temperature and humidity sensor is electrically connected to the main control module; the communication module is electrically connected to the main control module; the buzzer alarm module is electrically connected to the main control module; the Bluetooth module is electrically connected to the main control module; and the USB module is electrically connected to the main control module.

[0005] According to some embodiments of the present utility model, the display module includes:

[0006] A first triode, a base of which is electrically connected to the main control module via a first resistor, and an emitter of the first triode is grounded;

[0007] The display screen has an input terminal electrically connected to the collector of the first transistor through a second resistor.

[0008] According to some embodiments of the embodiments of the present utility model, the communication module includes:

[0009] A 4G communication module, the input end of which is electrically connected to the main control module;

[0010] A SIM card module, an input end of which is electrically connected to the main control module;

[0011] The antenna module is electrically connected to the output end of the 4G communication module.

[0012] According to some embodiments of the present utility model, the antenna module includes:

[0013] A GPS antenna, one end of which is grounded, the other end of which is electrically connected to the 4G communication module via a third resistor, and the other end of which is also electrically connected to the 4G communication module via a first inductor;

[0014] A 4G antenna, one end of which is grounded, and the other end of which is electrically connected to the 4G communication module via a first capacitor.

[0015] According to some embodiments of the present utility model, the buzzer alarm module includes:

[0016] A second triode, a base of which is electrically connected to the main control module via a fourth resistor, and an emitter of the second triode is grounded;

[0017] a voltage stabilizing diode, the anode of which is connected to the collector of the second transistor;

[0018] A buzzer, one end of which is connected to the cathode of the voltage-stabilizing diode, and the other end of which is connected to the collector of the second transistor;

[0019] An alarm indicator light is electrically connected to the main control module.

[0020] According to some embodiments of the present utility model, the USB module includes:

[0021] A USB input module, wherein a first input end is electrically connected to the main control module, the first input end of the USB input module is electrically connected to the USB interface through a fifth resistor and a second inductor, the second input end of the USB input module is electrically connected to the main control module, and the second input end of the USB input module is electrically connected to the USB interface through a sixth resistor and the second inductor;

[0022] A USB switching module is electrically connected to the main control module, and the USB switching module is used to switch the USB interface to a power supply interface, and the power supply interface supplies power to the IoT temperature and humidity recorder.

[0023] According to some embodiments of the embodiments of the present utility model, the IoT temperature and humidity recorder also includes a storage module, and the storage module is electrically connected to the main control module.

[0024] According to some embodiments of the present utility model, the IoT temperature and humidity recorder also includes a mode selection module, which is electrically connected to the main control module. The mode selection module includes multiple function buttons, and the multiple function buttons are electrically connected to the main control module.

[0025] According to some embodiments of the present utility model, the mode selection module further includes a status indicator light for indicating a selection state of the mode selection module, and the status indicator light is electrically connected to the main control module.

[0026] According to some embodiments of the present utility model, the IoT temperature and humidity recorder also includes a power management module, which is used to power the main control module, the display module, the temperature and humidity acquisition module, the communication module, the buzzer alarm module, the Bluetooth module, and the USB module.

[0027] The utility model discloses an Internet of Things temperature and humidity recorder for cold chain, which has at least the following beneficial effects: the temperature and humidity data of the cold chain device are acquired through the temperature and humidity acquisition module, and the temperature and humidity data are displayed through the display module; the Bluetooth module, the communication module, and the USB module are used to interact with the external device for temperature and humidity data; the USB module can also power the Internet of Things temperature and humidity recorder of the present application; when the temperature and humidity of the cold chain device are abnormal, the buzzer alarm module will be used to provide a buzzer alarm.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0030] Figure 1 This is a schematic diagram of the structure of an IoT temperature and humidity recorder for cold chain according to an embodiment of the utility model;

[0031] Figure 2 A circuit schematic diagram of a display module according to an embodiment of the present utility model;

[0032] Figure 3 This is a circuit schematic diagram of the main control module of the embodiment of the utility model;

[0033] Figure 4 The circuit schematic diagram of the mode selection module of the embodiment of the utility model;

[0034] Figure 5 The circuit schematic diagram of the buzzer alarm module of the embodiment of the utility model;

[0035] Figure 6 A circuit schematic diagram of a Bluetooth module and a storage module according to an embodiment of the utility model;

[0036] Figure 7 This is a circuit diagram of the temperature and humidity acquisition module of the embodiment of the utility model;

[0037] Figure 8 A schematic diagram of a part of the circuit of the communication module of the embodiment of the utility model;

[0038] Fig. 9 Another part of the circuit schematic diagram of the communication module of the embodiment of the utility model;

[0039] Fig.10 This is a circuit diagram of a USB module according to an embodiment of the present utility model;

[0040] Fig.11 This is a circuit diagram of a power management module according to an embodiment of the present utility model.

[0041] Reference numerals: main control module 100 , display module 200 , temperature and humidity acquisition module 300 , communication module 400 , buzzer alarm module 500 , Bluetooth module 600 , USB module 700 , storage module 800 , mode selection module 900 , power management module 1000 . DETAILED DESCRIPTION

[0042] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0043] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably confirm the specific meaning of the above terms in the present utility model in combination with the specific content of the technical solution.

[0046] refer to Figure 1 According to an embodiment of the utility model, an IoT temperature and humidity recorder for cold chain includes a main control module 100, a display module 200, a temperature and humidity acquisition module 300, a communication module 400, a buzzer alarm module 500, a Bluetooth module 600, and a USB module 700. The display module 200 is electrically connected to the main control module 100; the temperature and humidity acquisition module 300 includes an external temperature and humidity sensor and a built-in temperature and humidity sensor, the output end of the external temperature and humidity sensor is electrically connected to the main control module 100, and the output end of the built-in temperature and humidity sensor is electrically connected to the main control module 100; the communication module 400 is electrically connected to the main control module 100; the buzzer alarm module 500 is electrically connected to the main control module 100; the Bluetooth module 600 is electrically connected to the main control module 100; and the USB module 700 is electrically connected to the main control module 100.

[0047] Among them, reference Figure 3 The main control chip U811 in the main control module 100 uses a 32-bit ARM M3 core processor, which is responsible for controlling each module, data calculation, and data transmission. Figure 6 The Bluetooth module 600 includes a Bluetooth chip U20, and the Bluetooth module 600 is used to wirelessly interact with other external devices; wherein the Bluetooth module 600 can be wirelessly connected to a corresponding printer, and a user can print a paper file of relevant data through the printer connected to the Bluetooth module 600. Figure 7The first port SHT30_SDA_W of the external temperature and humidity sensor USB2 is electrically connected to the corresponding pin on the main control chip U811, and the first port SHT30_SDA_W is also grounded after combining a diode D38 and an inductor L27. The second port SHT30_SCL_W of the external temperature and humidity sensor USB2 is electrically connected to the corresponding pin on the main control chip U811, and the second port SHT30_SCL_W is also grounded after combining a diode D39 and an inductor L27; the first port SHT30-SDA of the built-in temperature and humidity sensor U78 is electrically connected to the corresponding pin of the main control chip U811, the second port SHT30-SCL of the built-in temperature and humidity sensor U78 is electrically connected to the corresponding pin of the main control chip U811, and the second port SHT30-SCL of the built-in temperature and humidity sensor U78 is also connected to the power supply VCC33 through a resistor R291. The built-in temperature and humidity sensor U78 is arranged in the enclosed space inside the cold chain device, and the external temperature and humidity sensor USB2 is arranged on the outer wall of the enclosed space inside the cold chain device. By cooperating with the built-in temperature and humidity sensor U78 and the external temperature and humidity sensor USB2, that is, comparing the temperature and humidity data obtained by the built-in temperature and humidity sensor U78 with the external temperature and humidity sensor USB2, the temperature and humidity data of the enclosed space inside the cold chain device can be accurately obtained.

[0048] refer to Figure 2 According to some embodiments of the present utility model, the display module 200 includes:

[0049] A first transistor Q106, the base of which is electrically connected to the main control module 100 via a first resistor R295, and the emitter of the first transistor Q106 is grounded;

[0050] The input end of the display screen FPC1 is electrically connected to the collector of the first transistor Q106 through the second resistor R269.

[0051] The display screen FPC1 includes an LCD display screen, and the contents displayed on the display screen FPC1 include operating parameters, temperature and humidity data, fault information, time, communication signal strength of the communication module 400, connection status of each interactive interface or interactive device, etc., wherein the temperature and humidity data include real-time temperature and humidity data, historical temperature and humidity data, and the number of stored temperature and humidity data. The required data is visualized through the display screen FPC1, simplifying the interaction between various data of the cold chain device in cold chain transportation and the user.

[0052] refer to Figure 8 and Fig. 9 According to some embodiments of the present utility model, the communication module 400 includes:

[0053] 4G communication module, the input end of which is electrically connected to the main control module 100;

[0054] SIM card module, the input end of which is electrically connected to the main control module 100;

[0055] The antenna module is electrically connected to the output end of the 4G communication module.

[0056] Among them, reference Figure 8 and Fig. 9 The 4G communication module includes a 4G communication chip U77, which is electrically connected to the main control module 100. The SIM card module includes a SIM card CARD1, and multiple pins of the SIM card CARD1 are electrically connected to corresponding pins of the 4G communication chip U77; the communication module 400 also includes a first communication status indicator LED20, a second communication status indicator LED21, and a communication control module. The anode of the first communication status indicator LED20 is connected to the power supply VCC33, the cathode of the first communication status indicator LED20 is connected to the collector of the transistor Q1 through a resistor R247, the emitter of the transistor Q1 is grounded, and the base of the transistor Q1 is connected to the corresponding pin of the 4G communication chip U77 through a resistor R245, the anode of the second communication status indicator LED21 is connected to the power supply VCC33, and the cathode of the second communication status indicator LED21 is connected to the collector of the transistor Q1 through a resistor R247. R250 is connected to the collector of transistor Q102, the emitter of transistor Q102 is grounded, and the base of transistor Q102 is connected to the corresponding pin of 4G communication chip U77 through resistor R248; the first communication status indicator LED20 and the second communication status indicator LED21 are used to indicate the preset communication status of communication module 400 with the preset indicator status, and the communication status at least includes communication start status, communication maintenance status, communication interruption status, communication end status, and communication shutdown status; the communication control module includes a communication control chip U83 electrically connected to the main control module 100. When the communication module 400 is in a state of communicating with other external devices and needs to disconnect the communication state between the two, the communication control chip U83, the 4G communication chip U77, and the main control module 100 are disconnected according to the relevant instructions of disconnecting the communication state. The upload and interaction of real-time and historical temperature and humidity data and real-time and historical cold chain device positioning trajectory information can be realized through the communication module 400.

[0057] refer to Figure 8 According to some embodiments of the present utility model, the antenna module includes:

[0058] A GPS antenna ANT1, one end of which is grounded, and the other end of the GPS antenna ANT1 is electrically connected to the 4G communication module via a third resistor R251, and the other end of the GPS antenna ANT1 is also electrically connected to the 4G communication module via a first inductor L21;

[0059] One end of the 4G antenna ANT4 is grounded, and the other end of the 4G antenna is electrically connected to the 4G communication module via the first capacitor C214.

[0060] Among them, the GPS antenna ANT1 is used to obtain the positioning trajectory information data of the cold chain device, and the 4G antenna ANT4 is used to achieve efficient communication between the communication module 400 and other external devices.

[0061] refer to Figure 5 According to some embodiments of the present utility model, the buzzer alarm module 500 includes:

[0062] The second triode Q105, the base of which is electrically connected to the main control module 100 via the fourth resistor R292, and the emitter of the second triode Q105 is grounded;

[0063] The positive electrode of the voltage stabilizing diode D36 is connected to the collector of the second transistor Q105;

[0064] One end of the buzzer BUZE1 is connected to the cathode of the voltage stabilizing diode D36, and the other end of the buzzer BUZE1 is connected to the collector of the second transistor Q105;

[0065] The alarm indicator LED2 is electrically connected to the main control module 100 .

[0066] Among them, when the temperature and humidity data obtained by the temperature and humidity acquisition module 300 is abnormal (the temperature and humidity data is outside the preset upper and lower threshold range), the main control module 100 will control the buzzer BUZE1 to sound an alarm, the alarm indicator LED2 to display the corresponding alarm status, and send alarm related information to other external devices connected to the communication module 400 through the communication module 400, so as to remind the operator to deal with the abnormal situation in time. In addition, when the IoT temperature and humidity recorder is powered on, the main control module 100 will first self-check each module of the IoT temperature and humidity recorder. When the functions of each module checked are normal, it will operate normally. When the module function is abnormal, the main control module 100 will send an alarm sound through the buzzer BUZE1, the alarm indicator LED2 will display the corresponding alarm status, and send alarm related information to other external devices connected to the communication module 400 through the communication module 400, so as to remind the operator to deal with the module with abnormal function in time, and then send relevant operation instructions to the IoT temperature and humidity recorder through the corresponding function button of the mode selection module 900 or other external devices, and start the IoT temperature and humidity recorder.

[0067] refer to Fig.10 According to some embodiments of the present utility model, the USB module 700 includes:

[0068] A USB input module, wherein the first input terminal USB_FS_DP is electrically connected to the main control module 100, the first input terminal USB_FS_DP of the USB input module is electrically connected to the connection device H10 through the fifth resistor R272 and the second inductor L24, the second input terminal USB_FS_DM of the USB input module is electrically connected to the main control module 100, the second input terminal USB_FS_DM of the USB input module is electrically connected to the connection device H10 through the sixth resistor R273 and the second inductor L24, and the connection device H10 is electrically connected to the USB interface;

[0069] The USB switching module is electrically connected to the main control module 100. The USB switching module is used to switch the USB interface or the connecting device H10 to a power supply interface; by connecting the external USB charging interface to the USB interface, and powering the IoT temperature and humidity recorder.

[0070] Among them, the USB interface can be connected to an external data storage device such as a U disk, and the temperature and humidity data, the potential information data of the cold chain device and other related data can be stored and backed up in the external data storage device through the USB interface; the Internet of Things temperature and humidity recorder of this application can also be built-in with a rechargeable ternary lithium battery, which can be charged through an external USB charging interface, and the rechargeable ternary lithium battery can be used to power the Internet of Things temperature and humidity recorder. The built-in rechargeable ternary lithium battery can be used as a backup battery when the external environment is powered off, providing a stable power supply for the Internet of Things temperature and humidity recorder.

[0071] refer to Figure 6 According to some embodiments of the present utility model, the IoT temperature and humidity recorder further includes a storage module 800 , and the storage module 800 is electrically connected to the main control module 100 .

[0072] Among them, reference Figure 6 The storage module 800 includes a data storage chip U68, which is electrically connected to the main control chip U811 in the main control module 100. It is conceivable that the interaction of temperature and humidity data and other related data between the data storage chip U68 and the main control module 100 is a two-way interaction. The data storage chip U68 can be selected according to the actual required data storage capacity, etc.

[0073] refer to Figure 1 and Figure 4 According to some embodiments of the present utility model, the IoT temperature and humidity recorder also includes a mode selection module 900, which is electrically connected to the main control module 100. The mode selection module 900 includes multiple function buttons, which are electrically connected to the main control module 100.

[0074] Among them, reference Figure 4The mode selection module 900 at least includes a first function button SW1, a second function button SW2, a third function button SW3, and a fourth function button SW4. The function buttons can be used to start and end the IoT temperature and humidity recorder, start checking each module of the IoT temperature and humidity recorder, and start wireless printing using Bluetooth. The number of function buttons and the functions that can be realized are not limited to these.

[0075] refer to Figure 4 According to some embodiments of the present utility model, the mode selection module 900 further includes a status indicator LED1 for indicating the selection state of the mode selection module 900, and the status indicator LED1 is electrically connected to the main control chip U811 of the main control module 100. The selection state of the mode selection module 900 is indicated by the preset different status indicators LED1.

[0076] refer to Figure 1 and Fig.10 According to some embodiments of the present utility model, the IoT temperature and humidity recorder further includes a power management module 1000, which is used to power the main control module 100, the display module 200, the temperature and humidity acquisition module 300, the communication module 400, the buzzer alarm module 500, the Bluetooth module 600, and the USB module 700. It is conceivable that the power management module 1000 is also used to power the storage module 800 and the mode selection module 900.

[0077] The utility model discloses an Internet of Things temperature and humidity recorder for cold chain, which has at least the following beneficial effects: the temperature and humidity data of the cold chain device are obtained through the temperature and humidity acquisition module 300, and the temperature and humidity data are displayed through the display module 200. The display module 200 can also display the location, time and other information obtained by the communication module 400. The Bluetooth module 600, the communication module 400 and the USB module 700 are used to interact with external devices for temperature and humidity data and other data. The USB module 700 can also power the Internet of Things temperature and humidity recorder of the present application. The storage module 800 is used to store temperature and humidity data and other related data. The mode selection module 900 is used to select the preset mode of the Internet of Things temperature and humidity recorder. When the temperature and humidity of the cold chain device are abnormal or the module in the Internet of Things temperature and humidity recorder has a functional abnormality, the buzzer alarm module 500 will be used to provide an alarm.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An IoT temperature and humidity recorder for cold chain, characterized in that: include: Main control module; A display module, electrically connected to the main control module; A temperature and humidity acquisition module, comprising an external temperature and humidity sensor and a built-in temperature and humidity sensor, wherein the output end of the external temperature and humidity sensor is electrically connected to the main control module, and the output end of the built-in temperature and humidity sensor is electrically connected to the main control module; A communication module, electrically connected to the main control module; A buzzer alarm module, electrically connected to the main control module; A Bluetooth module, electrically connected to the main control module; The USB module is electrically connected to the main control module.

2. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The display module comprises: A first triode, a base of which is electrically connected to the main control module via a first resistor, and an emitter of the first triode is grounded; The display screen has an input terminal electrically connected to the collector of the first transistor through a second resistor.

3. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The communication module comprises: A 4G communication module, the input end of which is electrically connected to the main control module; A SIM card module, an input end of which is electrically connected to the main control module; The antenna module is electrically connected to the output end of the 4G communication module.

4. The IoT temperature and humidity recorder for cold chain according to claim 3, characterized in that: The antenna module comprises: A GPS antenna, one end of which is grounded, the other end of which is electrically connected to the 4G communication module via a third resistor, and the other end of which is also electrically connected to the 4G communication module via a first inductor; A 4G antenna, one end of which is grounded, and the other end of which is electrically connected to the 4G communication module via a first capacitor.

5. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The buzzer alarm module comprises: A second triode, a base of which is electrically connected to the main control module via a fourth resistor, and an emitter of the second triode is grounded; a voltage stabilizing diode, the anode of which is connected to the collector of the second transistor; A buzzer, one end of which is connected to the cathode of the voltage-stabilizing diode, and the other end of which is connected to the collector of the second transistor; An alarm indicator light is electrically connected to the main control module.

6. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The USB module comprises: A USB input module, wherein a first input end is electrically connected to the main control module, the first input end of the USB input module is electrically connected to the USB interface through a fifth resistor and a second inductor, the second input end of the USB input module is electrically connected to the main control module, and the second input end of the USB input module is electrically connected to the USB interface through a sixth resistor and the second inductor; A USB switching module is electrically connected to the main control module, and the USB switching module is used to switch the USB interface to a power supply interface, and the power supply interface supplies power to the IoT temperature and humidity recorder.

7. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The IoT temperature and humidity recorder also includes a storage module, which is electrically connected to the main control module.

8. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The IoT temperature and humidity recorder also includes a mode selection module, which is electrically connected to the main control module. The mode selection module includes a plurality of function buttons, which are electrically connected to the main control module.

9. The IoT temperature and humidity recorder for cold chain according to claim 8, characterized in that: The mode selection module further includes a status indicator light for indicating a selection state of the mode selection module, and the status indicator light is electrically connected to the main control module.

10. The IoT temperature and humidity recorder for cold chain according to claim 1, characterized in that: The IoT temperature and humidity recorder also includes a power management module, which is used to power the main control module, the display module, the temperature and humidity acquisition module, the communication module, the buzzer alarm module, the Bluetooth module, and the USB module.

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