阅读说明：本技术 一种甲醛监测系统及方法 (Formaldehyde monitoring system and method ) 是由 唐旋 田依含 宋一鸣 任玥 刘明 漆超 方娇莉 于 2021-07-18 设计创作，主要内容包括：本发明涉及一种甲醛监测系统及方法,属于物联网技术领域。本发明包括甲醛监测仪、云端远程服务器和智能终端设备；甲醛监测仪通过网络通与云端连接,用于将采集到的甲醛数据通过网络传输到云服务器；所述云服务器通过网络与智能终端设备连接,用于将接收到的甲醛监测仪传输的数据进行存储和分析后传送给智能终端设备显示。通过云服务器存储和分析数据后,再由智能终端设备显示数据,进一步降低了成本的同时还增强了系统的功能。本发明还提供了一种甲醛监测方法,能够充分利用网络和物联网技术,通过智能终端设备来展现数据,能够进一步降低成本,同时还能提供更加丰富的监测信息。(The invention relates to a formaldehyde monitoring system and method, and belongs to the technical field of Internet of things. The formaldehyde monitoring system comprises a formaldehyde monitor, a cloud remote server and intelligent terminal equipment; the formaldehyde monitor is connected with the cloud end through a network and is used for transmitting the acquired formaldehyde data to the cloud server through the network; the cloud server is connected with the intelligent terminal equipment through a network and used for storing and analyzing the received data transmitted by the formaldehyde monitor and then transmitting the data to the intelligent terminal equipment for display. After the data are stored and analyzed by the cloud server, the data are displayed by the intelligent terminal device, so that the cost is further reduced, and the functions of the system are enhanced. The invention also provides a formaldehyde monitoring method, which can make full use of the network and the Internet of things technology, display data through the intelligent terminal equipment, further reduce the cost and provide richer monitoring information.)

1. A formaldehyde monitoring system, its characterized in that: the formaldehyde monitoring system comprises a formaldehyde monitor, a cloud server and an intelligent terminal; the formaldehyde monitor is connected with the cloud server through a network and used for transmitting the acquired formaldehyde data to the cloud server through the network; the cloud server is connected with the intelligent terminal equipment through a network and used for storing and analyzing the received data transmitted by the formaldehyde monitor and then transmitting the data to the intelligent terminal equipment for display.

2. The formaldehyde monitoring system of claim 1, wherein the formaldehyde monitor comprises:

the data acquisition unit is used for acquiring a formaldehyde concentration value in the air regularly through the formaldehyde gas sensor;

the data cache unit is used for storing the formaldehyde concentration value which fails to be transmitted when the network is disconnected;

and the data communication unit is used for transmitting the formaldehyde concentration value in the regularly collected air to the cloud server through the network module, or checking whether a cached formaldehyde concentration value exists or not when the network is communicated, and transmitting the cached formaldehyde concentration value to the cloud server if the cached formaldehyde concentration value exists.

3. The formaldehyde monitoring system of claim 1, wherein the cloud server comprises:

the data acquisition and communication service unit is used for communicating with the formaldehyde monitor, receiving the concentration value of formaldehyde in the air detected by the formaldehyde monitor and storing the data in a database;

the intelligent data analysis unit is used for intelligently calculating historical data detected by the formaldehyde monitor and stored in a database to obtain the trend of future formaldehyde concentration values in the air of a monitoring point where the formaldehyde monitor is located;

and the intelligent terminal communication service unit is used for communicating with the intelligent terminal equipment and transmitting the real-time formaldehyde concentration value detected by the formaldehyde monitor or the future concentration value predicted by the intelligent analysis unit to the intelligent terminal equipment.

4. The formaldehyde monitoring system of claim 3, wherein the intelligent data analysis unit comprises: the home decoration mode trend prediction module and the home mode trend prediction module;

the home decoration mode trend prediction module is used for predicting the environment after home decoration is finished, predicting how long the user can reach the check-in standard according to a gas diffusion equation and by combining historical data detected by a formaldehyde monitor, and recommending the user how much time to check in through the intelligent terminal;

the home mode trend prediction module is used for predicting the change trend of a monitoring point of the formaldehyde monitor for a period of time in the future according to historical data detected by the formaldehyde monitor and reminding a user through the intelligent terminal.

5. The formaldehyde monitoring system according to any one of claims 1-4, wherein: each formaldehyde monitor has a unique ID, and the intelligent terminal device is communicated with the cloud server periodically to obtain the real-time formaldehyde concentration value transmitted by the latest monitor with the specified ID and the trend predicted value calculated by the intelligent analysis unit.

6. A method of monitoring formaldehyde with the formaldehyde monitoring system of claim 1, comprising the steps of:

the formaldehyde monitor is connected with the cloud server through a network, and transmits the acquired formaldehyde data to the cloud server through the network;

the cloud server is connected with the intelligent terminal equipment through a network, and stores and analyzes received data transmitted by the formaldehyde monitor; and the cloud server transmits the stored and analyzed data collected by the formaldehyde monitor to the intelligent terminal equipment for display.

7. The method of claim 6, wherein the formaldehyde is monitored using the formaldehyde monitoring system of claim 1, and further comprising: the formaldehyde monitor regularly acquires a formaldehyde concentration value in the air through a formaldehyde gas sensor; the formaldehyde monitor transmits the formaldehyde concentration value in the air collected periodically to a cloud server through a network; the formaldehyde monitor stores formaldehyde concentration values which are failed to be transmitted due to network disconnection, and transmits the cached formaldehyde concentration values to the cloud server when the network is connected.

8. The method of claim 6, wherein the formaldehyde is monitored using the formaldehyde monitoring system of claim 1, and further comprising: the cloud server receives a formaldehyde concentration value in the air detected by the formaldehyde monitor, and stores the data in a database; the cloud server intelligently calculates historical data stored in a database and detected by the formaldehyde monitor to obtain the trend of future formaldehyde concentration values in the air of a monitoring point where the formaldehyde monitor is located; and the intelligent terminal communication service unit is communicated with the intelligent terminal equipment and transmits the real-time formaldehyde concentration value or the predicted future concentration value detected by the formaldehyde monitor to the intelligent terminal equipment.

9. The method of claim 6, wherein the formaldehyde is monitored using the formaldehyde monitoring system of claim 1, and further comprising: the cloud server is divided into a home decoration mode trend prediction module and a home mode for trend prediction; the home decoration mode predicts the environment after home decoration is finished, predicts how long time the user needs to reach the check-in standard by combining historical data detected by a formaldehyde monitor according to a gas diffusion equation, and suggests the user how much time the user needs to check in through an intelligent terminal; the home mode predicts the change trend of a formaldehyde monitor monitoring point for a period of time in the future according to historical data detected by the formaldehyde monitor, and reminds a user through the intelligent terminal.

10. The method of any one of claims 6 to 9, wherein the formaldehyde is monitored using the formaldehyde monitoring system of claim 1, and wherein: each formaldehyde monitor has a unique ID, and the intelligent terminal equipment is communicated with the cloud server regularly to obtain a real-time formaldehyde concentration value transmitted by the latest monitor with the specified ID and a trend predicted value intelligently analyzed by the cloud server.

Technical Field

The invention relates to a formaldehyde monitoring system and method, and belongs to the technical field of Internet of things.

Background

At present, most of formaldehyde detectors directly display data collected by a formaldehyde gas sensor on a screen of the collector after the data are collected, the detection data can be displayed in time in the mode, but more data cannot be stored due to the limitation of factors such as the cost of the detectors, historical data cannot be analyzed, so that more information is difficult to obtain, and the function of the formaldehyde detectors is limited. Meanwhile, the formaldehyde detector based on the electrochemical sensor provided by the prior art can only perform real-time detection, read data at a certain moment, and cannot continuously detect the formaldehyde value within a certain period of time, so that the data detection is accidental, and the 1-hour mean definition in the formaldehyde detection standard is difficult to meet.

Disclosure of Invention

The invention aims to solve the technical problem of providing a formaldehyde monitoring system and method, which can utilize a network to transmit data, display richer monitoring information through intelligent terminal equipment and provide uninterrupted monitoring, thereby solving the problems.

The technical scheme of the invention is as follows: a formaldehyde monitoring system comprises a formaldehyde monitor, a cloud server and an intelligent terminal; the formaldehyde monitor is connected with the cloud server through a network and used for transmitting the acquired formaldehyde data to the cloud server through the network; the cloud server is connected with the intelligent terminal equipment through a network and used for storing and analyzing the received data transmitted by the formaldehyde monitor and then transmitting the data to the intelligent terminal equipment for display.

The formaldehyde monitor comprises a data acquisition unit, a data acquisition unit and a formaldehyde gas sensor, wherein the data acquisition unit is used for acquiring the concentration value of formaldehyde in the air regularly through the formaldehyde gas sensor; the data cache unit is used for storing the formaldehyde concentration value which fails to be transmitted when the network is disconnected; and the data communication unit is used for transmitting the formaldehyde concentration value in the regularly collected air to the cloud server through the network module, or checking whether a cached formaldehyde concentration value exists or not when the network is communicated, and transmitting the cached formaldehyde concentration value to the cloud server if the cached formaldehyde concentration value exists.

The cloud server comprises a data acquisition communication service unit, a data storage unit and a data processing unit, wherein the data acquisition communication service unit is used for communicating with the formaldehyde monitor, receiving the concentration value of formaldehyde in the air detected by the formaldehyde monitor and storing the data in a database; the intelligent data analysis unit is used for intelligently calculating historical data detected by the formaldehyde monitor and stored in a database; a trend of future formaldehyde concentration values in the air of a monitoring point where the formaldehyde monitor is located; and the intelligent terminal communication service unit is used for communicating with the intelligent terminal equipment and transmitting the real-time formaldehyde concentration value detected by the formaldehyde monitor or the future concentration value predicted by the intelligent analysis unit to the intelligent terminal equipment. The intelligent data analysis unit comprises: the home decoration mode trend prediction module and the home mode trend prediction module; the home decoration mode trend prediction module is used for predicting the environment after home decoration is finished, predicting how long the user can reach the check-in standard according to a gas diffusion equation and by combining historical data detected by a formaldehyde monitor, and recommending the user how much time to check in through the intelligent terminal; and the home mode trend prediction module is used for predicting the change trend of a monitoring point of the formaldehyde monitor in a future period of time according to the historical data detected by the formaldehyde monitor and reminding a user through the intelligent terminal.

Each formaldehyde monitor has a unique ID, and the intelligent terminal device is communicated with the cloud server periodically to obtain the real-time formaldehyde concentration value transmitted by the latest monitor with the specified ID and the trend predicted value calculated by the intelligent analysis unit.

A formaldehyde monitoring method comprises the following steps:

the formaldehyde monitor is connected with the cloud server through a network, and transmits the acquired formaldehyde data to the cloud server through the network;

the cloud server is connected with the intelligent terminal equipment through a network, and stores and analyzes received data transmitted by the formaldehyde monitor; and the cloud server transmits the stored and analyzed data collected by the formaldehyde monitor to the intelligent terminal equipment for display.

The formaldehyde monitor regularly acquires a formaldehyde concentration value in the air through a formaldehyde gas sensor; the formaldehyde monitor transmits the formaldehyde concentration value in the air collected periodically to a cloud server through a network; the formaldehyde monitor stores formaldehyde concentration values which are failed to be transmitted due to network disconnection, and transmits the cached formaldehyde concentration values to the cloud server when the network is connected.

The cloud server receives a formaldehyde concentration value in the air detected by the formaldehyde monitor, and stores the data in a database; the cloud server intelligently calculates historical data stored in a database and detected by the formaldehyde monitor to obtain the trend of future formaldehyde concentration values in the air of a monitoring point where the formaldehyde monitor is located; and the intelligent terminal communication service unit is communicated with the intelligent terminal equipment and transmits the real-time formaldehyde concentration value or the predicted future concentration value detected by the formaldehyde monitor to the intelligent terminal equipment. The cloud server is divided into a home decoration mode trend prediction module and a home mode for trend prediction; the home decoration mode predicts the environment after home decoration is finished, predicts how long time the user needs to reach the check-in standard by combining historical data detected by a formaldehyde monitor according to a gas diffusion equation, and suggests the user how much time the user needs to check in through an intelligent terminal; the home mode predicts the change trend of a formaldehyde monitor monitoring point for a period of time in the future according to historical data detected by the formaldehyde monitor, and reminds a user through the intelligent terminal.

Each formaldehyde monitor has a unique ID, and the intelligent terminal equipment is communicated with the cloud server regularly to obtain a real-time formaldehyde concentration value transmitted by the latest monitor with the specified ID and a trend predicted value intelligently analyzed by the cloud server.

The invention has the beneficial effects that: compared with the prior art, the method and the system can fully utilize the network and internet of things technology, display data through the intelligent terminal equipment, further reduce the cost and provide richer monitoring information; the invention also provides trend prediction for predicting future formaldehyde concentration trend, which is convenient for users to plan home decoration.

Drawings

FIG. 1 is a block diagram of the system components of an embodiment of the present invention;

FIG. 2 is a structural diagram of the formaldehyde monitor according to the present invention;

FIG. 3 is a flow diagram of a formaldehyde monitoring process of the present invention;

FIG. 4 is a molecular diffusion diagram of an embodiment of the present invention.

In the figure: the system comprises a formaldehyde monitoring system 100, a cloud server 110, a formaldehyde monitor 120, an intelligent terminal 130, a data acquisition unit 121, a communication unit 122 and a data caching unit 123.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

As shown in fig. 1, a formaldehyde monitoring system 100 according to the present invention includes a cloud server 110, a formaldehyde monitor 120, and an intelligent terminal 130. The formaldehyde collection monitor 120 is connected with the cloud server 110 through a network, and is used for transmitting collected formaldehyde data to the cloud server 110 through the network; the cloud server 110 is connected to the intelligent terminal 130 through a network, and is configured to store and analyze the received data transmitted by the formaldehyde monitor 120, and transmit the data to the intelligent terminal 130 for display.

The formaldehyde monitor 120 can be connected to the cloud server 110 after being connected to the internet through network communication modules such as an ethernet module, a WIFI module, or a 5G module. In this embodiment, the WIFI module is used to access the internet.

The cloud server 110 applies for a cloud server rental service provided by a cloud computing manufacturer such as an airy cloud server or an Tencent cloud server. The intelligent terminal device 130 includes a mobile phone, a tablet computer and the like. Each formaldehyde monitor 120 has a unique ID. During use, the formaldehyde monitor 120 is bound through the WeChat applet of the intelligent terminal device 130 according to the ID of the formaldehyde monitor. In this embodiment, the ID of the formaldehyde monitor is generated from the serial number of the microcontroller.

As shown in fig. 1, the cloud server 110 includes a data acquisition and communication service unit 111, configured to communicate with the formaldehyde monitor 120, receive a formaldehyde concentration value in the air detected by the formaldehyde monitor 120, and store the data in a database. And the intelligent data analysis unit 112 is used for intelligently calculating the historical data detected by the formaldehyde monitor and stored in the database to obtain the trend of the future formaldehyde concentration value in the air of the monitoring point where the formaldehyde monitor 120 is located. The intelligent terminal communication service unit 113 is configured to communicate with the intelligent terminal 130, and transmit the real-time formaldehyde concentration value detected by the formaldehyde monitor 120 or the future concentration value predicted by the intelligent analysis unit 112 to the intelligent terminal 113.

The data intelligent analysis unit 112 includes: the home decoration mode trend prediction module and the home mode trend prediction module; the home decoration mode trend prediction module is used for predicting the environment after home decoration is finished, predicting how long the user can reach the check-in standard by combining historical data detected by the formaldehyde monitor 120 according to a gas diffusion equation, and suggesting how much time the user check-in is through the intelligent terminal 130; and the home mode trend prediction module is used for predicting the change trend of the monitoring point of the formaldehyde monitor 120 in a future period of time according to the historical data detected by the formaldehyde monitor 120 and reminding the user through the intelligent terminal 130.

The formaldehyde concentration value is required to be not more than 0.1mg/m per hour mean value according to the latest standard³Is a safe living environment.

The home decoration mode prediction principle and the basic method comprise the following steps: diffusion equation + time series prediction model.

The home decoration mode mainly aims at the house decoration back and before living, and is characterized in that: the house is not inhabited by people and has small man-made interference factors, and for newly decorated houses, people mainly adopt a windowing ventilation mode to discharge indoor harmful gases and utilize the diffusion and dilution capability of the convection mixing effect of the atmosphere on the harmful substances. Therefore, the concentration change condition of the harmful gas is analyzed by adopting a convection diffusion equation, and meanwhile, a time sequence prediction model is adopted to predict the diffusion process of the harmful gas which is discharged into indoor air from a harmful source and then discharged to the outdoor. The calculation of a is briefly described as follows: data detectable by production instrumentation: indoor concentration of formaldehyde (unit: mg/m)³) Temperature (unit: c) humidity (unit: %) time (detailed to year, month, day, hour, minute and second).

1. Convection diffusion equation

The mass transfer rule of the flow system is represented by a convection diffusion equation, and the concentration distribution can be obtained by solving the equation. The equation is obtained by carrying out material balance on a certain space infinitesimal body in the system. For a two-component system, the amount of component A flowing into a micelle is added to the amount generated by chemical reaction in the micelle, and the outflow is subtracted to obtain the accumulated amount of component A in the micelle. Considering that both the entry and exit of component a into and out of the infinitesimal body are caused by both diffusion and convection, and that the diffusion flux is expressed by feike's law, as depicted in fig. 4, the following convective diffusion equation can be derived:

notation of symbols:

1、D_ABis the molecular diffusion coefficient.

2、r_AIs the amount of component A generated by chemical reaction in unit time and unit volume space, the initial sum of the harmful contents of indoor home decoration is a fixed value but not a variable value, r_A＝0。

3、C_AThe value of the mass concentration of the harmful gas in the environment can be measured by the instrument

4.τ is the measurement time.

5、u_x、u_yAnd u_zThe flow velocity u is the value of the x, y and z direction components of the right hand coordinate system.

The atmospheric air enters the chamber, and the ventilation area and the ventilation direction in the chamber are random, so that the atmospheric air forms small turbulence in the chamber. Turbulent flow formation means that the gas flow rate slows down, tending to equalize in the x, y, z directions, thenDecomposing the wind speed V imported in real time by the background to obtain a numerical value for measuring for a period of time (the moment is recorded after the small program detects that the concentration changes for the first timeAnd the difference value of the last measurement and recording time is the measurement time tau) according to the diffusion equation, divide D_ABThe other quantities are known quantities, and finally the space molecular diffusion coefficient D can be calculated_ABThe longest time of natural diffusion relative to the standard concentration can be judged according to the coefficient and the concentration difference at that time, and the survival time can be deduced.

2. Time series model

Briefly, the following steps are carried out: the time sequence is a sequence formed by arranging numerical values of a variable at different times in chronological order, and the time unit of the time sequence can be minutes, hours, days, weeks, ten days, months, seasons, years and the like. The time series model is a mathematical model established by using time series, is mainly used for short-term prediction in the future, and belongs to a trend prediction method.

(II) a home mode prediction principle and a basic method: linear relation equation + BP neural network mathematical model

The formaldehyde monitor's in the mode of living mainly to the daily indoor environment of people function has: real-time detection and real-time reporting of harmful gases and numerical prediction of harmful substances in a week.

The method comprises the following steps: in the aspect of predicting the function of the second mode, the following prediction algorithm is obtained through a large amount of experiments and data processing: big data are generated based on long-term real-time monitoring data uploading, two algorithms are combined, future data sources can be brought back to an original measured database for comparison, the data prediction adopts an indoor and outdoor double-line mutual correction principle, a BP neural network mathematical algorithm is adopted at the same time, the measured data are deeply learned, the harmful gas value is predicted by combining the temperature and humidity values of an outdoor line, the two algorithms are combined, and finally accurate predicted data are returned

And (3) calculating: data detectable by production instrumentation: indoor formaldehyde concentration rho (unit: mg/m)³) Temperature T (unit: c) humidity RH (unit: %) time t (detailed year, month, day).

1. Indoor and outdoor double-line mutual correction

Indoor wiring: experiments show that indoor formaldehyde emission and temperature form a promotion trend, the formaldehyde concentration is increased by about 15% -30% when the formaldehyde concentration is increased by 1 ℃, and a relevant temperature formula 1 is finally determined by considering error values through a large number of experiments:

Δρ₁＝ΔT*18％ρ (1)

humidity becomes a promoting trend, the humidity value increases by 1%, the formaldehyde concentration increases by about 0.5%, and the relative humidity formula 1 is finally determined:

Δρ₂＝ΔRH*0.5％ρ (2)

therefore, the predicted values are obtained through integration:

ρ′＝ρ+Δρ₁+Δρ₂ (3)

outdoor wiring: introducing weather forecast data to obtain outdoor temperature and humidity at each time in the future, detecting indoor and outdoor temperature difference and humidity difference in real time (correcting the obtained temperature difference in real time), obtaining estimated change of temperature and humidity, and using formula rho' ═ rho + delta rho₁+Δρ₂Predicted future data may be calculated.

Note: through comparison of a large number of experimental consideration error values, 18% and 0.5% are set as initial values, after a certain amount of detection data exist for a user, a prediction data source is brought back to an original detection database for comparison, and the 18% and 0.5% are corrected so that prediction is more accurate

According to the quantity of the harmful gas concentration collected by the detection entity and the quantity related to the environment, the BP neural network algorithm is adopted to deeply learn the relation between the quantity of the harmful gas concentration and the environment, and a neural network which is specific to the indoor environment of each user can be constructed, so that an accurate prediction model is achieved.

As shown in fig. 2, which is a structural diagram of the formaldehyde monitor of the present invention, the formaldehyde monitor 120 includes: the data acquisition unit 121 is used for acquiring a formaldehyde concentration value in the air regularly through a formaldehyde gas sensor; a data cache unit 122, configured to store a formaldehyde concentration value that fails to be transmitted when a network is disconnected; the data communication unit 123 is configured to transmit the formaldehyde concentration value in the regularly collected air to the cloud server 110 through a network module, or check whether a cached formaldehyde concentration value exists when the network is connected, and transmit the cached formaldehyde concentration value to the cloud server 112 if the cached formaldehyde concentration value exists.

The data acquisition unit 121 includes: a temperature and humidity sensor, a formaldehyde gas sensor and a data acquisition program; the data cache unit 122 includes an EEPROM memory and a storage management program; the data communication unit 123 includes: a network module and a network communication program. The data acquisition program, the storage management program and the network communication program are operated in a microcontroller (MCU, namely a single chip microcomputer). The network module uses a WIFI network module ESP 8266.

According to the application condition, the network communication and system operation effects are comprehensively considered. When the system runs, the formaldehyde monitor 130 collects data every 10 seconds and transmits the data to the cloud server 110. Or data can be acquired 1 time per second or 2 seconds, and then the data is transmitted to the cloud server 110 after averaging every 10 seconds, so that the detection accuracy is further improved without affecting the performance of the cloud server 110, and the server load is reduced.

In this embodiment, the ID of the formaldehyde monitor is generated from the serial number of the microcontroller.

As shown in fig. 3, a flow chart of the formaldehyde monitoring method of the present invention includes:

s1, the formaldehyde monitor 120 is connected with the cloud server 110 through a network, and the acquired formaldehyde data are transmitted to the cloud server 110 through the network.

And S2, connecting the cloud server 110 with the intelligent terminal device 130 through a network, and storing and analyzing the received data transmitted by the formaldehyde monitor 120.

And S3, the cloud server 110 transmits the stored and analyzed data collected by the formaldehyde monitor 120 to the intelligent terminal device 130 for display.

The formaldehyde monitor 120 periodically collects the concentration value of formaldehyde in the air through a formaldehyde gas sensor. The formaldehyde monitor 120 takes data every 10 s.

The formaldehyde concentration value in the regularly collected air is transmitted to the cloud server 110 by the formaldehyde monitor 120 through a network, and after the formaldehyde monitor 120 collects data, the formaldehyde concentration value is immediately transmitted to the cloud server 110 through the network.

The formaldehyde monitor 120 stores the formaldehyde concentration value that is failed in transmission due to the network outage, and transmits the cached formaldehyde concentration value to the cloud server 110 when the network is connected. During the data transmission process, if the network is disconnected or the data transmission fails, the formaldehyde monitor 120 will cache the data in the memory chip or the memory of the microcontroller.

The cloud server 110 receives the formaldehyde concentration value in the air detected by the formaldehyde monitor 120, and stores the data in a database;

the cloud server 110 intelligently calculates historical data stored in a database and detected by the formaldehyde monitor 110 to obtain the trend of future formaldehyde concentration values in the air of a monitoring point where the formaldehyde monitor is located;

the intelligent terminal communication service unit 113 communicates with the intelligent terminal device 130, and transmits the real-time formaldehyde concentration value or the predicted future concentration value detected by the formaldehyde monitor 120 to the intelligent terminal device 130. The cloud server 112 is divided into a home mode trend prediction module and a home mode for trend prediction; the home decoration mode predicts the environment after home decoration is finished, predicts how long time the user needs to reach the check-in standard by combining historical data detected by the formaldehyde monitor 120 according to a gas diffusion equation, and recommends how much time the user checks in through the intelligent terminal 130; the home mode predicts the change trend of the monitoring point of the formaldehyde monitor 120 in a future period of time according to the historical data detected by the formaldehyde monitor 120, and reminds the user through the intelligent terminal 130.

The intelligent calculation comprises the following steps: a home mode and a home-mounted mode. The home decoration mode prediction principle and the basic method are as follows: diffusion equation + time series prediction model. The home mode prediction principle and the basic method are as follows: linear relation equation + BP neural network mathematical model. The specific principles and methods of implementation are described in detail in an embodiment of a formaldehyde monitoring system.

The formaldehyde monitor 120 includes: the data acquisition unit 121 is used for acquiring a formaldehyde concentration value in the air regularly through a formaldehyde gas sensor; a data cache unit 122, configured to store a formaldehyde concentration value that fails to be transmitted when a network is disconnected; the data communication unit 123 is configured to transmit the formaldehyde concentration value in the regularly collected air to the cloud server 110 through a network module, or check whether a cached formaldehyde concentration value exists when the network is connected, and transmit the cached formaldehyde concentration value to the cloud server 112 if the cached formaldehyde concentration value exists. The data acquisition unit 121 includes: a temperature and humidity sensor, a formaldehyde gas sensor and a data acquisition program; the data cache unit 122 includes an EEPROM memory and a storage management program; the data communication unit 123 includes: a network module and a network communication program. The data acquisition program, the storage management program and the network communication program are operated in a microcontroller (MCU, namely a single chip microcomputer). The network module uses a WIFI network module ESP 8266.

Each formaldehyde monitor has a unique ID, and the intelligent terminal device 130 periodically communicates with the cloud server 112 to obtain the real-time formaldehyde concentration value transmitted by the latest ID-assigned monitor 120 and the trend prediction value intelligently analyzed by the cloud server.

According to the invention, historical data and real-time data are checked through the mobile phone terminal, so that the information is richer, the distance limit is broken through, and no screen prevails over a screen. Meanwhile, the indoor formaldehyde gas content is monitored in real time continuously, and the national standard is met. And (4) predicting by adopting methods such as a time series prediction model and the like according to a gas diffusion equation. Future trends and predictions of home decoration stay times can be seen.

While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit and scope of the present invention.