Multi-point monitoring device for tobacco curing environment

Abstract

The utility model discloses a multi-point monitoring device for a tobacco curing environment. The multi-point monitoring device comprises a shell, a single chip microcomputer, an oxygen sensor, an ammonia gas sensor, a formaldehyde sensor, a temperature and humidity sensor, a core wrapping temperature sensor, a moisture sensor, a wireless communication module and a power module, signal processing circuits are arranged between the oxygen sensor, the ammonia gas sensor and the formaldehyde sensor and the single chip microcomputer, each signal processing circuit comprises a voltage dividing module, at least one operational amplification module and an analog-to-digital conversion module, and the signal processing circuits are used for converting current signals into voltage signals, amplifying the voltage signals, converting the voltage signals into digital signals and transmitting the digital signals to the single chip microcomputer; the wireless communication module is used for sending the data received by the single-chip microcomputer to a remote terminal. The power supply module is used for providing working voltage suitable for the device. By means of the tobacco curing environment multi-point monitoring device, automatic and efficient monitoring of a large-area tobacco storehouse can be achieved in a simple and convenient arrangement mode.

Description

Technical Field

[0001] The present application relates to the technical field of tobacco curing, and in particular to a multi-point monitoring device for a tobacco curing environment. Background Art

[0002] In the tobacco curing industry, existing tobacco warehouses typically occupy a large area, with multiple tobacco stacks within a single warehouse. This necessitates testing various parameters within the airtight curing environment within the warehouse, such as oxygen, ammonia, and formaldehyde content, as well as temperature, humidity, and moisture. The temperature of the tobacco cores within each stack also needs to be monitored. Existing tobacco curing environment parameter testing equipment is typically independently designed, configured, and operated. Consequently, when faced with a large warehouse and numerous tobacco stacks, a large number of sensors of each type must be deployed, resulting in a disorganized and chaotic environment. Some environmental parameters are repeatedly collected and tested, increasing the operational costs of tobacco curing environment parameter monitoring and hindering the realization of automated and intelligent monitoring objectives and effects. Summary of the Invention

[0003] In view of this, an embodiment of the present application provides, on one hand, a multi-point monitoring device for a tobacco curing environment, wherein a plurality of tobacco stacks are placed in the tobacco curing environment, each tobacco stack includes a plurality of stacked tobacco storage boxes, and the tobacco storage boxes are used to store tobacco, and the multi-point monitoring device is arranged in the tobacco storage box, and the multi-point monitoring device includes a shell and a single-chip microcomputer arranged in the shell, and the single-chip microcomputer is electrically connected to an oxygen sensor, an ammonia sensor, a formaldehyde sensor, a temperature and humidity sensor, a core temperature sensor, a moisture sensor, a wireless communication module and a power supply module; wherein a signal processing circuit is provided between the oxygen sensor, the ammonia sensor and the formaldehyde sensor and the single-chip microcomputer, and the signal processing circuit includes a voltage divider module, at least one operational amplifier module and an analog-to-digital conversion module; wherein the voltage divider One end of the voltage divider module is electrically connected to the oxygen sensor, the ammonia sensor or the formaldehyde sensor, and the other end is electrically connected to at least one operational amplifier module. The voltage divider module is used to convert the current signal into a voltage signal; the operational amplifier module is arranged between the voltage divider module and the analog-to-digital conversion module, and is used to amplify the voltage signal received from the voltage divider module; the analog-to-digital conversion module is arranged between the operational amplifier module and the single-chip microcomputer, and is used to convert the voltage signal received from the operational amplifier module into a digital signal and transmit it to the single-chip microcomputer; the wireless communication module is used to send the oxygen content, ammonia content, formaldehyde content, temperature and humidity data, core temperature data and moisture data received by the single-chip microcomputer to a remote terminal; the power supply module is used to provide a working voltage suitable for the multi-point monitoring device.

[0004] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the operational amplifier module includes an operational amplifier and an adjustment resistor, the operational amplifier is electrically connected to the adjustment resistor, and the amplification factor of the operational amplifier module is adjusted by adjusting the resistance value of the adjustment resistor.

[0005] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the analog-to-digital conversion module includes an analog-to-digital conversion chip, and the clock pin, enable pin and data output pin of the analog-to-digital conversion chip are respectively electrically connected to different I / O pins of the single-chip microcomputer.

[0006] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the temperature and humidity sensor includes a first wired communication module, the first wired communication module is electrically connected to the single-chip microcomputer, and the first wired communication module transmits data with the single-chip microcomputer via an integrated circuit bus I2C communication method.

[0007] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the core temperature sensor includes a second wired communication module, the second wired communication module is electrically connected to the single-chip microcomputer, and the second wired communication module transmits data with the single-chip microcomputer via an integrated circuit bus I2C communication method.

[0008] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the moisture sensor includes a third wired communication module, and the third wired communication module includes a data sending pin, a data receiving pin and a read-write control pin, which are respectively electrically connected to different I / O pins of the single-chip microcomputer for data transmission with the single-chip microcomputer.

[0009] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the wireless communication module includes a LORA wireless communication module, a WIFI wireless communication module and a 4G wireless communication module; wherein, the LORA wireless communication module transmits data with the single-chip microcomputer through a serial peripheral interface SPI communication mode; the WIFI wireless communication module and the 4G wireless communication module transmit data with the single-chip microcomputer through a universal synchronous / asynchronous receiver / transmitter USART communication mode.

[0010] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the power supply module includes a voltage stabilizing circuit, the voltage stabilizing circuit is connected to an external power supply module or a battery-powered module, the voltage stabilizing circuit includes a voltage conversion module, and the input pin and ground pin of the voltage conversion module are respectively connected to the positive pole and negative pole of the external power supply module or the battery-powered module to convert its output voltage into the operating voltage of other modules.

[0011] According to the multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application, optionally, the single-chip microcomputer is also electrically connected to a first dip switch and a second dip switch; the first dip switch and the second dip switch each include eight switch buttons, and each switch button can be set to an on state or an off state; the first dip switch is used to set the device data upload time interval and the communication channel, and the second dip switch is used to set the communication address and the communication mode.

[0012] On the other hand, an embodiment of the present application provides a multi-point monitoring system for a tobacco curing environment, comprising a remote terminal and a multi-point monitoring device for a tobacco curing environment as described in any one of the embodiments of the present application; the tobacco curing environment comprises a plurality of tobacco stacks, each of the tobacco stacks being provided with the multi-point monitoring device for the tobacco curing environment, the multi-point monitoring device for the tobacco curing environment being used to collect temperature and humidity, oxygen content, ammonia content, formaldehyde content, temperature and humidity data and moisture data around the tobacco stack, as well as core temperature data in the tobacco stack, and send the data to the remote terminal.

[0013] The multi-point monitoring device for tobacco curing environment provided in the embodiment of the present application can, on the one hand, realize integrated automatic detection of oxygen content, ammonia content, formaldehyde content, temperature, humidity, core package temperature and moisture content related to tobacco stack curing, thereby reducing the workload of detection personnel and improving detection efficiency. At the same time, compared with the traditional various sensors that form a type of detection device separately, the number of detection device controls and wiring is reduced, the layout scheme of the detection device is simplified, and the detection and monitoring efficiency is further improved. On the other hand, the multi-point monitoring device for tobacco curing environment can wirelessly transmit oxygen content, ammonia content, formaldehyde content, temperature, humidity, core package temperature and moisture content data to a remote terminal, realize automatic data uploading and recording, reduce the error rate of data recording, and improve detection accuracy. On the other hand, during the nitrogen filling and oxygen reduction process, automatic detection of environmental parameters around the tobacco stack can be realized without personnel entering the low-oxygen working area, which can improve detection safety and reduce detection risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings in the embodiments of the present application.

[0015] Figure 1 Schematic diagram of the overall structure of a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0016] Figure 2 This is a circuit connection diagram of a signal processing circuit in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0017] Figure 3 This is a circuit connection diagram of a temperature and humidity sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0018] Figure 4 This is a circuit connection diagram of a core temperature sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0019] Figure 5 This is a circuit connection diagram of a moisture sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0020] Figure 6 This is a circuit connection diagram of a wireless communication module in a multi-point monitoring device for a tobacco curing environment provided by an embodiment of the present application;

[0021] Figure 7 This is a circuit connection diagram of a power module in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0022] Figure 8 This is a structural diagram of an eight-position DIP switch in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application;

[0023] Figure 9 This is a schematic diagram of the layout of a multi-point monitoring system for a tobacco curing environment in one embodiment of the present application.

[0024] Description of Reference Numerals

[0025] 10. Shell

[0026] 20. Microcontroller

[0027] 30. Oxygen sensor

[0028] 31. Ammonia sensor

[0029] 32. Formaldehyde sensor

[0030] 33. Temperature and humidity sensor

[0031] 331. First wired communication module

[0032] 34. Core temperature sensor

[0033] 341. Second wired communication module

[0034] 35. Moisture sensor

[0035] 351. Third wired communication module

[0036] 36. Signal processing circuit

[0037] 361. Voltage divider module

[0038] 362. Operational amplifier module

[0039] 363. Analog-to-digital conversion module

[0040] 40. Wireless communication module

[0041] 41. LoRa wireless communication module; 42. Wi-Fi wireless communication module; 43. 4G wireless communication module

[0042] 50. Power module

[0043] 51. Voltage stabilizing circuit; 52. External power supply module; 53. Battery power supply module

[0044] 61, the first eight-position DIP switch; 62, the second eight-position DIP switch DETAILED DESCRIPTION

[0045] The principles and spirit of the present application will be described below with reference to several exemplary embodiments. It should be understood that the purpose of providing these embodiments is to make the principles and spirit of the present application clearer and more thorough, so that those skilled in the art can better understand and implement the principles and spirit of the present application. The exemplary embodiments provided herein are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments herein, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of this application.

[0046] In the detailed description that follows, reference may be made to the various specification drawings that are part of this application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar figure numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be utilized or structural, logical or electrical changes may be made to the embodiments of the present application. In addition, similar terms including first, second, and third in this application are only used to distinguish one entity (or operation) from another entity (or operation), and do not require or imply any order or association between these entities (or operations).

[0047] Figure 1 This is a schematic diagram of the overall structure of the multi-point monitoring device for tobacco curing environment provided in the embodiment of the present application. Figure 1 As shown, a multi-point monitoring device for a tobacco curing environment in an embodiment of the present application can be used to detect various environmental parameters around a tobacco stack. The multi-point monitoring device for a tobacco curing environment may include a shell 10, in which a single-chip microcomputer 20, an oxygen sensor 30, an ammonia sensor 31, a formaldehyde sensor 32, a temperature and humidity sensor 33, a core temperature sensor 34, a moisture sensor 35, a signal processing circuit 36, a wireless communication module 40 and a power supply module 50 are provided.

[0048] The oxygen sensor 30 can be used to detect the oxygen content, i.e., the oxygen concentration, around the tobacco stack. Specifically, the oxygen sensor 30 can output a current signal in response to the oxygen content around the tobacco stack. The ammonia sensor 31 can be used to detect the ammonia content, i.e., the ammonia concentration, around the tobacco stack. Specifically, the ammonia sensor 31 can output a current signal in response to the ammonia content around the tobacco stack. The formaldehyde sensor 32 can be used to detect the formaldehyde content, i.e., the formaldehyde concentration, around the tobacco stack. Specifically, the formaldehyde sensor 32 can output a current signal in response to the formaldehyde content around the tobacco stack.

[0049] Generally speaking, the current values ​​of the current signals output by the oxygen sensor 30, the ammonia sensor 31, and the formaldehyde sensor 32 are relatively small, such as current signals at the microampere level. Therefore, in order to improve the accuracy of the detection of oxygen content, ammonia content, and formaldehyde content, the tobacco curing environment multi-point monitoring device is provided with a signal processing circuit 36. The oxygen sensor 30, the ammonia sensor 31, and the formaldehyde sensor 32 are respectively electrically connected to the first signal circuit, and then respectively electrically connected to the single-chip computer 20, forming independent signal transmission circuits to convert the current signals of the oxygen sensor 30, the ammonia sensor 31, and the formaldehyde sensor 32 into voltage signals, amplify the voltage signals, and convert the amplified voltage signals into digital signals for transmission to the single-chip computer 20.

[0050] Temperature and humidity sensor 33 can be used to detect the temperature and humidity around the tobacco stack, core temperature sensor 34 can be used to detect the core temperature inside the tobacco stack, and moisture sensor 35 can be used to detect the moisture content inside the tobacco stack. Temperature and humidity sensor 33, core temperature sensor 34, and moisture sensor 35 are each electrically connected to microcontroller 20 and transmit the collected data to microcontroller 20.

[0051] The wireless communication module 40 can be electrically connected to the single-chip microcomputer 20, and the wireless communication module 40 can communicate with the single-chip microcomputer 20. The wireless communication module 40 can be used to receive data such as oxygen content, ammonia content, formaldehyde content, temperature, humidity, moisture content, etc. around the tobacco stack sent by the single-chip microcomputer 20, as well as the temperature data of the core package inside the tobacco stack, and wirelessly transmit these data to the remote terminal to realize automatic detection of environmental parameters around and inside the tobacco stack.

[0052] The power module 50 can be electrically connected to the single-chip microcomputer 20. The power module 50 is used to convert the output voltage of the external power supply into the operating voltage of other modules, so that external power supplies of different types and different output voltages can support the operation of other modules after conversion.

[0053] The multi-point monitoring device for tobacco curing environment provided in the embodiment of the present application can, on the one hand, realize integrated automatic detection of oxygen content, ammonia content, formaldehyde content, temperature, humidity, core package temperature and moisture content related to tobacco stack curing, thereby reducing the workload of detection personnel and improving detection efficiency. At the same time, compared with the traditional various sensors that form a type of detection device separately, the number of detection device controls and wiring is reduced, the layout scheme of the detection device is simplified, and the detection and monitoring efficiency is further improved. On the other hand, the multi-point monitoring device for tobacco curing environment can wirelessly transmit oxygen content, ammonia content, formaldehyde content, temperature, humidity, core package temperature and moisture content data to a remote terminal, realize automatic data uploading and recording, reduce the error rate of data recording, and improve detection accuracy. On the other hand, during the nitrogen filling and oxygen reduction process, automatic detection of environmental parameters around the tobacco stack can be realized without personnel entering the low-oxygen working area, which can improve detection safety and reduce detection risks.

[0054] Figure 2 This is a circuit connection diagram of a signal processing circuit in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 2 As shown, according to some embodiments of the present application, optionally, the signal processing circuit 36 ​​may include a voltage divider module 361 , at least one operational amplifier module 362 and an analog-to-digital conversion module 363 . Figure 2 The following description takes an example in which the signal processing circuit 36 ​​includes two operational amplifier modules 362 , namely a first operational amplifier module 362 a and a second operational amplifier module 362 b .

[0055] Taking the oxygen sensor 30 as an example, Figure 2As shown, voltage divider module 361 is electrically connected between oxygen sensor 30 and at least one operational amplifier module 362. Voltage divider module 361 can be used to convert a current signal into a voltage signal. A first end of voltage divider module 361 is electrically connected to the output end of oxygen sensor 30, and a second end of voltage divider module 361 is grounded. After the current signal flows through voltage divider module 361, voltage divider module 361 generates a voltage, thereby converting the current signal into a voltage signal. Voltage divider module 361 can be a voltage divider resistor. The resistance value of the voltage divider resistor can be flexibly adjusted according to actual conditions and is not limited in this application.

[0056] After the voltage divider module 361 converts the current signal into a voltage signal, the voltage value of the voltage signal is also small, such as only at the millivolt level. At least one operational amplifier module 362 can be electrically connected to the voltage divider module 361, and at least one operational amplifier module 362 can be used to amplify the voltage signal to obtain an amplified voltage signal. Figure 2 As shown, after the voltage signal is amplified by the first operational amplifier module 362a and the second operational amplifier module 362b, a voltage signal with a relatively large voltage value, such as a voltage signal of 0.4V-2V, can be obtained. The amplification factors of the first operational amplifier module 362a and the second operational amplifier module 362b can be flexibly adjusted according to actual conditions, and this application does not limit this.

[0057] Each operational amplifier module 362 may include an operational amplifier and an adjustment resistor. The adjustment resistor is electrically connected to the operational amplifier, and the amplification factor of the operational amplifier module 362 can be adjusted by adjusting the resistance value of the adjustment resistor.

[0058] like Figure 2 As shown, the analog-to-digital conversion module 363 is electrically connected between at least one operational amplifier module 362 and the single-chip microcomputer 20. The analog-to-digital conversion module 363 can be used to convert the amplified voltage signal into a digital signal and transmit the digital signal to the single-chip microcomputer 20. In some examples, the analog-to-digital conversion module 363 can be an analog-to-digital conversion (AD) chip. The clock pin, enable pin, and data output pin of the AD chip can be electrically connected to different I / O pins of the single-chip microcomputer 20, respectively. The AD chip can be used to perform analog-to-digital conversion on the amplified voltage signal output by the operational amplifier module 362, convert the amplified voltage signal into a digital signal, and transmit the digital signal to the single-chip microcomputer 20. The single-chip microcomputer 20 can be used to read the digital signal output by the AD chip to obtain oxygen content data around the tobacco stack.

[0059] Similarly, the ammonia sensor 31 and the formaldehyde sensor 32 are connected to the signal processing circuit 36, and the current signal is converted into a voltage signal. The millivolt-level voltage signal is amplified and then converted into a digital signal. After being read by the single-chip microcomputer 20, the ammonia content or formaldehyde content data around the tobacco stack is obtained.

[0060] Figure 3 This is a circuit connection diagram of a temperature and humidity sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 3 As shown, in some embodiments, the temperature and humidity sensor 33 uses a first wired communication module 331 to communicate with the single-chip microcomputer 20. The first wired communication module 331 transmits data with the single-chip microcomputer 20 through an integrated circuit bus (Inter-Integrated Circuit, I2C) communication method. For example, the clock signal output pin and the data signal output pin of the first wired communication module 331 are electrically connected to different I / O pins of the single-chip microcomputer 20 respectively.

[0061] Figure 4 This is a circuit connection diagram of a core temperature sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 4 As shown, in some embodiments, the core temperature sensor 34 uses a second wired communication module 341 to communicate with the microcontroller 20, and the second wired communication module 341 transmits data with the microcontroller 20 through the integrated circuit bus I2C communication method. For example, the clock signal output pin and the data signal output pin of the second wired communication module 341 can be electrically connected to different I / O pins of the microcontroller 20 respectively.

[0062] Figure 5 This is a circuit connection diagram of a moisture sensor in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 5 As shown, in some embodiments, the core temperature sensor 34 uses a third wired communication module 351 to communicate with the microcontroller 20. The third wired communication module 351 includes a data sending pin, a data receiving pin and a read-write control pin, which are electrically connected to different I / O pins of the microcontroller 20 respectively.

[0063] Figure 6 This is a circuit connection diagram of a wireless communication module in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 6As shown, in some embodiments, the wireless communication module 40 includes a LORA wireless communication module 41, a WIFI wireless communication module 42, and a 4G wireless communication module 43. Among them, the LORA wireless communication module 41 transmits data with the single-chip microcomputer 20 through a serial peripheral interface (SPI) communication mode, and the WIFI wireless communication module 42 and the 4G wireless communication module 43 transmit data with the single-chip microcomputer 20 through a USART (Universal Synchronous / Asynchronous Receiver / Transmitter) communication mode.

[0064] Figure 7 This is a circuit connection diagram of a power module in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 7 As shown, the power module 50 includes a voltage stabilizing circuit 51. The voltage stabilizing circuit 51 can be connected to an external power module 52 and a battery power module 53. The battery power module 53 can include a rechargeable lithium battery pack and a dry cell battery. The voltage stabilizing circuit 51 includes a voltage conversion module. The input pin and ground pin of the voltage conversion module are respectively connected to the positive and negative poles of the external power module 52 or the battery power module 53 to convert its output voltage into the operating voltage of other modules. Through the voltage stabilizing circuit 51, it is possible to convert the output voltage of the external power module 52 and the battery power module 53 into the operating voltage of other modules. The power supply method can be flexibly selected according to actual work needs. For example, during tobacco storage, in places with higher electricity safety, dry cells can be used to avoid the risk of spontaneous combustion of rechargeable lithium batteries.

[0065] The tobacco curing environment multi-point monitoring device provided in the embodiment of the present application can be provided with an eight-position dial switch in each device. Figure 8 This is a structural diagram of an eight-position dial switch in a multi-point monitoring device for a tobacco curing environment provided in an embodiment of the present application. Figure 8 As shown, the eight-position DIP switch is provided with eight switch buttons, each of which can be set to "ON" or "OFF." The eight-position DIP switch includes a first eight-position DIP switch 61 and a second eight-position DIP switch 62. The first eight-position DIP switch 61 controls the device's data upload interval and sets the device's communication channel through the combination of the switch buttons; the second eight-position DIP switch 62 sets the device's communication address and communication mode through the combination of the switch buttons. The communication channel, communication address, and communication mode are used to form a network to form multiple data transmission nodes. The eight-position DIP switch can be electrically connected to the single-chip microcomputer 20.

[0066] Some embodiments of the present application also provide a tobacco curing environment multi-point monitoring system, wherein the tobacco stack environmental parameter detection system includes a large environment, which can be a large tobacco curing base such as a factory building or a warehouse, and the present application does not limit this. The large environment includes at least one or more small environments, which can be a tobacco stack storage unit such as a warehouse, and the present application does not limit this. The small environment is set to one or more layers, and each layer of the small environment includes at least one or more tobacco stacks. A tobacco curing environment multi-point monitoring device is arranged in each tobacco stack, and the tobacco curing environment multi-point monitoring device is used to wirelessly transmit the oxygen concentration, ammonia concentration, formaldehyde concentration, temperature and humidity, moisture content, and core temperature data inside the tobacco stack to a remote terminal. According to the tobacco curing environment multi-point monitoring system provided by the embodiment of the present application, by arranging the tobacco curing environment multi-point monitoring device provided by the embodiment of the present application in each tobacco stack, the layout plan is simplified, the layout difficulty is reduced, and the automatic detection of parameters in the complex environment of multiple tobacco stacks in a large environment scenario is achieved.

[0067] In some embodiments, the single chip microcomputer 20 can be a low-power single chip microcomputer product, which can increase the working time of the device under the same power consumption.

[0068] In some embodiments, the oxygen sensor 30 , the ammonia sensor 31 , and the formaldehyde sensor 32 may be sensors with high sensitivity and high stability, which are suitable for long-term monitoring of the relevant gas content in the environment.

[0069] In some embodiments, the operational amplifier module 362 may use an operational amplifier with high precision and low noise characteristics to ensure the quality and accuracy of the sensor output signal.

[0070] In some embodiments, the temperature and humidity sensor 33 uses a high-precision temperature and humidity module. The temperature and humidity sensor 33 can be powered by a 3.3V power supply and transmit data with the microcontroller 20 via an inter-integrated circuit (I2C) communication method. In some embodiments, the core temperature sensor 34 can use a high-precision sensor. The core temperature sensor 34 can be powered by a 3.3V power supply and transmit data with the microcontroller 20 via an inter-integrated circuit (I2C) communication method. In some embodiments, the moisture sensor 35 can use a TK100T moisture sensor 35. The moisture sensor 35 can be powered by a 3.3V power supply and transmit data with the microcontroller 20 via a third wired communication module 351. In some embodiments, the third wired communication module 351 can be an RS485 communication chip. The above sensor selection has the advantages of high precision and stability, and can provide accurate and reliable measurement data. The I2C or RS485 communication method transmits data with the microcontroller, which is used to conveniently perform integrated monitoring of the measurement data.

[0071] In some embodiments, the LORA wireless communication module 41 can be integrated by the SX1278 chip and communicate with the single-chip microcomputer 20 via a serial peripheral interface (SPI) communication mode. The WIFI wireless communication module 42 can be integrated by the ESP32 series chip and connected to the single-chip microcomputer 20 using a USART (Universal Synchronous / Asynchronous Receiver / Transmitter). The 4G wireless communication module 43 is connected to the single-chip microcomputer 20 via a USART. By setting a variety of wireless communication modes such as LORA, WIFI, and 4G, the multi-point monitoring device for tobacco curing environment provided in the embodiment of the present application can transmit and collect data through multiple communication modes, which is convenient for the integrated management of multi-point monitoring. The power module 50 can provide an efficient DC boost function to increase the lower input voltage to the required higher voltage output.

[0072] In some embodiments, as Figure 8As shown, the combination of the first four switch buttons in the first eight-position DIP switch 61 is used to set the data upload interval for a multi-point tobacco curing environment monitoring device. Using a binary number system, the positions from left to right are 1, 2, 4, and 8, respectively. The cycle time base is set to 30 minutes. Assuming the data upload cycle is set to 6 hours, the positions of the first four switches are OFF, OFF, ON, and ON, respectively, i.e., 4×30 + 8×30 = 360 minutes. The combination of the last four switch buttons in the first eight-position DIP switch 61 is used to set the communication channel for the multi-point tobacco curing environment monitoring device. Using a binary number system, the positions from left to right are 1, 2, 4, and 8, respectively. This allows for a total of 16 communication channels, from 00 to 15. For example, when the positions of the last four switches are OFF, ON, OFF, and ON, respectively, communication channel 10 is used. The second eight-position DIP switch 62 can be used to set the communication address and communication mode for the multi-point tobacco curing environment monitoring device. Specifically, the combination of the first six switch buttons in the second eight-position DIP switch 62 is used to set the communication address of a multi-point monitoring device for a tobacco curing environment. Using a binary number system, the positions from left to right are 1, 2, 4, 8, 16, and 32, respectively. This allows for a total of 64 communication addresses, from 00 to 63. For example, when the first six switch positions are ON, OFF, OFF, ON, OFF, and ON, communication address 41 is used. The combination of the last two switch buttons in the second eight-position DIP switch 62 is used to set the communication mode of the multi-point monitoring device for a tobacco curing environment. Using a binary number system, the positions from left to right are 1 and 2, respectively. This allows for four communication modes. For example, when the last two switches are both off, mode 0 is selected. Using the first eight-position DIP switch 61 and the second eight-position DIP switch 62, 16 different communication channels, four communication modes, and 64 communication addresses can be set. Once the system is networked, data transmission for 16*4*64=4096 nodes can be achieved.

[0073] The embodiment of the present application can also construct a multi-point monitoring system for a tobacco curing environment, including a remote terminal and the multi-point monitoring device of the above embodiment; the tobacco curing environment includes multiple tobacco stacks, and each of the tobacco stacks is provided with the multi-point monitoring device of the tobacco curing environment. The multi-point monitoring device of the tobacco curing environment is used to collect temperature and humidity, oxygen content, ammonia content, formaldehyde content, temperature and humidity data and moisture data around the tobacco stack, as well as the core temperature data in the tobacco stack, and send them to the remote terminal.

[0074] Figure 9 This is a schematic diagram of the layout of a multi-point monitoring system for tobacco curing environment in one embodiment of the present application. Figure 9As shown, a tobacco factory has 10 warehouses, each with four floors, each containing 24 tobacco stacks. A tobacco curing environment multi-point monitoring device is placed in each tobacco stack, resulting in a total of 960 tobacco curing environment multi-point monitoring devices deployed throughout the factory's warehouses. Each device transmits collected data on oxygen content, ammonia content, formaldehyde content, temperature, humidity, core package temperature, and moisture content to a remote terminal via LoRa, Wi-Fi, or 4G wireless communication. Each device has a unique data transmission node, for example, each node is named using a "channel-mode-address" format. The embodiments of the present application enable multi-point monitoring of multiple tobacco stacks within a tobacco factory warehouse.

[0075] It should be noted that the present application is not limited to the specific configurations and processes described above or shown in the figures. The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working process of the described system, device, module or unit can refer to the corresponding process in the method embodiment without further description. It should be understood that the scope of protection of the present application is not limited to this. Any technician familiar with the technical field can think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of the present application.

Claims

1. A multi-point monitoring device for tobacco curing environment, characterized in that: A plurality of tobacco stacks are placed in the tobacco curing environment, each tobacco stack includes a plurality of stacked tobacco storage boxes, and the tobacco storage boxes are used to store tobacco. The multi-point monitoring device is arranged in the tobacco storage box, and the multi-point monitoring device includes a shell and a single-chip microcomputer arranged in the shell, and the single-chip microcomputer is electrically connected to an oxygen sensor, an ammonia sensor, a formaldehyde sensor, a temperature and humidity sensor, a core temperature sensor, a moisture sensor, a wireless communication module and a power module; wherein, A signal processing circuit is provided between each of the oxygen sensor, the ammonia sensor, and the formaldehyde sensor and the single-chip microcomputer. The signal processing circuit includes a voltage divider module, at least one operational amplifier module, and an analog-to-digital conversion module. One end of the voltage divider module is electrically connected to the oxygen sensor, the ammonia sensor, or the formaldehyde sensor, and the other end is electrically connected to the at least one operational amplifier module. The voltage divider module is used to convert a current signal into a voltage signal. The operational amplifier module is provided between the voltage divider module and the analog-to-digital conversion module, and is used to amplify the voltage signal received from the voltage divider module. The analog-to-digital conversion module is provided between the operational amplifier module and the single-chip microcomputer, and is used to convert the voltage signal received from the operational amplifier module into a digital signal and transmit it to the single-chip microcomputer. The wireless communication module is used to send the oxygen content, ammonia content, formaldehyde content, temperature and humidity data, core temperature data and moisture data received by the single chip computer to a remote terminal; the power supply module is used to provide an operating voltage suitable for the multi-point monitoring device.

2. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The operational amplifier module includes an operational amplifier and an adjusting resistor. The operational amplifier is electrically connected to the adjusting resistor. The amplification factor of the operational amplifier module is adjusted by adjusting the resistance value of the adjusting resistor.

3. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The analog-to-digital conversion module includes an analog-to-digital conversion chip, and a clock pin, an enable pin, and a data output pin of the analog-to-digital conversion chip are electrically connected to different I / O pins of the single-chip microcomputer respectively.

4. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The temperature and humidity sensor includes a first wired communication module, which is electrically connected to the single-chip microcomputer. The first wired communication module transmits data with the single-chip microcomputer via an integrated circuit bus I2C communication mode.

5. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The core temperature sensor includes a second wired communication module, which is electrically connected to the single-chip microcomputer. The second wired communication module transmits data with the single-chip microcomputer via an integrated circuit bus I2C communication mode.

6. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The moisture sensor includes a third wired communication module, which includes a data sending pin, a data receiving pin and a read-write control pin, which are electrically connected to different I / O pins of the microcontroller respectively and are used for data transmission with the microcontroller.

7. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The wireless communication module includes a LORA wireless communication module, a WIFI wireless communication module and a 4G wireless communication module; wherein, the LORA wireless communication module transmits data with the single-chip microcomputer through a serial peripheral interface SPI communication mode; the WIFI wireless communication module and the 4G wireless communication module transmit data with the single-chip microcomputer through a universal synchronous / asynchronous receiver / transmitter USART communication mode.

8. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The power supply module includes a voltage stabilizing circuit, which is connected to an external power supply module or a battery-powered module. The voltage stabilizing circuit includes a voltage conversion module, and the input pin and ground pin of the voltage conversion module are respectively connected to the positive electrode and negative electrode of the external power supply module or the battery-powered module to convert its output voltage into the operating voltage of other modules.

9. The multi-point monitoring device for tobacco curing environment according to claim 1, characterized in that: The single-chip microcomputer is electrically connected to a first dip switch and a second dip switch; the first dip switch and the second dip switch each include eight switch buttons, each switch button can be set to an on state or an off state; the first dip switch is used to set the data upload time interval and communication channel of the device, and the second dip switch is used to set the communication address and communication mode.

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