CN210119462U - Air formaldehyde distributed cloud monitoring system - Google Patents
Air formaldehyde distributed cloud monitoring system Download PDFInfo
- Publication number
- CN210119462U CN210119462U CN201920443084.4U CN201920443084U CN210119462U CN 210119462 U CN210119462 U CN 210119462U CN 201920443084 U CN201920443084 U CN 201920443084U CN 210119462 U CN210119462 U CN 210119462U
- Authority
- CN
- China
- Prior art keywords
- formaldehyde
- circuit
- module
- data
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The utility model relates to an air formaldehyde distributed cloud monitoring system, including a plurality of formaldehyde concentration measurement module, data transmission module and cloud platform module, formaldehyde concentration measurement module is used for measuring the concentration data of formaldehyde in the air and transmits to the cloud platform module after packing data through the data transmission module, and the cloud platform module receives the data package and analyzes, and displays and stores the data after analyzing; the formaldehyde concentration measuring module comprises a microprocessor, a formaldehyde concentration measuring circuit, a weak current amplifying circuit and an analog-to-digital conversion circuit. The utility model discloses a be provided with a plurality of formaldehyde concentration measurement module, realized the real-time supervision of the regional a plurality of formaldehyde concentrations of awaiting measuring, solved the problem that present formaldehyde measurement system measurement node is few, effective monitoring distance is short.
Description
Technical Field
The utility model relates to an air formaldehyde distributing type cloud monitoring system.
Background
Formaldehyde is a first carcinogen, the superscript of indoor formaldehyde gas can cause long-term influence on human bodies, and the measurement of indoor formaldehyde content becomes an important component of environmental measurement. Early formaldehyde concentration monitoring was mainly based on chemical and physical methods. Koucao et al found that formaldehyde in acidic media solution can inhibit potassium bromate and can oxidize basic fuchsin solution to cause it to fade, establishing a suppressed kinetic photometry of liquid formaldehyde monitoring. Yaohijun et al used a capillary column made of elastic quartz glass, directly measured formaldehyde using acetone as an internal standard, and analyzed by chromatography. These methods achieve effective measurement of formaldehyde molecules, but have major drawbacks in terms of convenience, flexibility and universality of measurement.
With the development of modern electronic and sensor technology, more and more analytical instruments are used in formaldehyde concentration monitoring. However, such instruments are often used in scientific research and metering, and the measured formaldehyde parameter data are only stored in the terminal monitoring machine, and are lack of local information processing and storage, which is not favorable for dynamic real-time monitoring of formaldehyde concentration in a large range. And utilize wiFi technique to monitor formaldehyde, each monitoring node uses the same network data transmission protocol, simple structure, convenient to use. However, the method has poor measurement accuracy, short communication distance and poor penetrability, and limits the use occasions and the monitoring coverage range of the system. In order to solve the problems of complicated multi-node formaldehyde monitoring mode, high professional requirement and the like, Zigbee is utilized in a formaldehyde monitoring system. However, in actual operation, the permeability of the Zigbee technology is poor, and the data transmission distance is short, which is not favorable for long-distance and large-range monitoring.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can solve above-mentioned air formaldehyde distributing type cloud monitoring system who has now problems.
In order to achieve the above purpose, the utility model provides a following technical scheme: an air formaldehyde distributed cloud monitoring system comprises a plurality of formaldehyde concentration measuring modules, a data transmission module and a cloud platform module, wherein the formaldehyde concentration measuring modules are used for measuring concentration data of formaldehyde in air, packaging the concentration data through the data transmission module and transmitting the packaged concentration data to the cloud platform module, and the cloud platform module receives and analyzes the data packet and displays and stores the analyzed data;
the formaldehyde concentration measuring module comprises a microprocessor, a formaldehyde concentration measuring circuit, a weak current amplifying circuit and an analog-to-digital conversion circuit, wherein a current signal generated in the formaldehyde concentration measuring circuit is amplified by the weak current amplifying circuit and then is transmitted to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit converts the amplified current signal into a digital signal and then transmits the digital signal to the microprocessor, and the microprocessor receives the digital signal and transmits the digital signal to the data transmission module.
Furthermore, the formaldehyde concentration measuring circuit is an electrochemical formaldehyde sensor, and the electrochemical formaldehyde sensor converts the formaldehyde concentration into a corresponding current signal after detecting the formaldehyde concentration in the air.
Furthermore, the formaldehyde concentration measuring module also comprises a power circuit and a voltage reduction circuit which is connected with the power circuit and is used for reducing the voltage value of the power circuit.
Furthermore, the voltage reduction circuit comprises a first-stage voltage reduction circuit and a second-stage voltage reduction circuit, the first-stage voltage reduction circuit reduces voltage and then outputs a first voltage reduction value, the second-stage voltage reduction circuit comprises a first voltage reduction circuit and a second voltage reduction circuit, the first voltage reduction circuit reduces voltage of the first voltage reduction value and outputs a second voltage reduction value, and the second voltage reduction circuit reduces voltage of the first voltage reduction value and outputs a third voltage reduction value.
Further, the first step-down value is 5.5V, the second step-down value is 5V, and the third step-down value is 3.3V.
Further, the cloud platform comprises a network communication module in signal connection with the data transmission module and a protocol processing module connected with the network communication module.
The beneficial effects of the utility model reside in that: the utility model discloses a be provided with a plurality of formaldehyde concentration measurement module, realized the real-time supervision of the regional a plurality of formaldehyde concentrations of awaiting measuring, solved the problem that present formaldehyde measurement system measurement node is few, effective monitoring distance is short.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Figure 1 is the utility model discloses an air formaldehyde distributing type cloud monitoring system structure schematic diagram.
Fig. 2 is a circuit schematic diagram of the first stage voltage reduction circuit.
Fig. 3 is a circuit schematic diagram of the second stage voltage reduction circuit.
Fig. 4 is a schematic circuit diagram of the weak current amplifying circuit.
Fig. 5 is a circuit schematic diagram of an analog-to-digital conversion circuit.
Fig. 6 is a flow chart of the air formaldehyde distributed cloud monitoring method of the present invention.
Fig. 7 is a flowchart of the microprocessor receiving an instruction sent by the cloud platform module.
Fig. 8 is a flowchart of the microprocessor sending instructions to the cloud platform module.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Please refer to fig. 1 to 5, the utility model discloses an air formaldehyde distributed cloud monitoring system in a preferred embodiment, the system includes a plurality of formaldehyde concentration measurement module 1, data transmission module 2 and cloud platform module 3, formaldehyde concentration measurement module 1 is arranged in measuring the concentration data of formaldehyde in the air and through data transmission module 2 with the concentration data packing after transmission extremely cloud platform module 3, cloud platform module 3 receives the data packet and analyzes the data packet to data after analyzing are shown and are stored.
The formaldehyde concentration measuring module 1 further comprises a power circuit 11 and a voltage reduction circuit 12 connected with the power circuit 11 for reducing the voltage value of the power circuit 11. The voltage reduction circuit 12 comprises a first-stage voltage reduction circuit and a second-stage voltage reduction circuit, the first-stage voltage reduction circuit reduces voltage and outputs a first voltage reduction value, the second-stage voltage reduction circuit comprises a first voltage reduction circuit and a second voltage reduction circuit, the first voltage reduction circuit reduces voltage of the first voltage reduction value and outputs a second voltage reduction value, and the second voltage reduction circuit reduces voltage of the first voltage reduction value and outputs a third voltage reduction value. In this embodiment, the power circuit 11 is a 12V power supply, the first step-down value is 5.5V, the second step-down value is 5V, and the third step-down value is 3.3V.
The formaldehyde concentration measuring module 1 further comprises a microprocessor 16, a formaldehyde concentration measuring circuit 13, a weak current amplifying circuit 14 and an analog-to-digital conversion circuit 15, wherein a current signal generated in the formaldehyde concentration measuring circuit 13 is amplified by the weak current amplifying circuit 14 and then transmitted to the analog-to-digital conversion circuit 15, the analog-to-digital conversion circuit 15 converts the amplified current signal into a digital signal and then transmits the digital signal to the microprocessor 16, and the microprocessor 16 receives the digital signal and transmits the digital signal to the data transmission module 2. In this embodiment, the microprocessor 16 is an MCU, the formaldehyde concentration measuring circuit 13 is an electrochemical formaldehyde sensor, the electrochemical formaldehyde sensor 13 converts the formaldehyde concentration into a corresponding current signal after detecting the formaldehyde concentration in the air, and the weak current amplifying circuit 14 is a nA-level weak current amplifying circuit 14.
The first-stage voltage reduction circuit 12 takes an LM2596 chip as a core, a 12V power supply supplies power to the chip LM2596, output capacitors CVCC and C1_8 play a role in output filtering and also improve the stability of a voltage stabilization loop, R _ F1, R _ F2 and R _ F3 are feedback resistors and are used for adjusting output voltage, 2 pins are output, and the expression of the output voltage is as follows:
VOUT＝VREF×(1+(R_F2+R_F3)/R_F1)
in the formula, VREFFor an internal reference source, VREF1.23V. The output voltage was set to 5.5V.
The second-stage voltage reduction circuit 12 takes an SPX3819 chip as a core. The voltage reduction circuit 12 takes a voltage of 5.5V as an input, and the voltage is reduced to 5V and supplied to the nA-level weak current amplification circuit 14 of the formaldehyde concentration measurement module 1. In the figure, pin 1 of the SPX3819 chip is an input pin of the voltage reduction circuit 12, pin 2 is grounded, pin 3 is an enable terminal, a resistor R5VOut _1 and a resistor R5VOut _2 connected to pin 4 are used for adjusting the output voltage of pin 5 to 5V, decoupling capacitors C5.0 and C3_1 mainly play a role in filtering to stabilize the output voltage, and an inductor LVCC2 is used for preventing current sudden change from causing interference to the power supply and the ground of the chip. The second-stage voltage reduction circuit 12 can provide a high-stability 5V voltage, so that the signal stability of the weak current amplification circuit 14 is ensured. The second voltage reduction circuit 12 has the same principle, and is not described herein again.
The weak current amplifying circuit 14 is used for amplifying the nA-level weak current generated by the electrochemical formaldehyde sensor and supplying the same to the analog-to-digital conversion circuit 15. Wherein, P1 is connected with formaldehyde sensor, and Port (+) and Port (-) are output ports. Because the electrochemical formaldehyde sensor can generate a point position drift phenomenon in a standby state, the electrochemical formaldehyde sensor directly causes self loss caused by non-external environment to the sensor, and the accuracy of finally measured data such as formaldehyde concentration and the like is influenced. Therefore, in order to prevent the generation of the phenomenon, field effect transistors are used in the design of the circuit to be in short circuit with the Port (+) terminal and the Port (-) terminal of the electrochemical formaldehyde sensor P1, wherein Q1 is a P-type field effect transistor of a model J177. The current passes through a weak current amplifying circuit 14 based on an AD8628 chip, and the weak current signal is amplified into a corresponding voltage signal. R10 is a potentiometer, and the amplification factor of the circuit can be changed by changing R10, so that the data can be calibrated.
A high-precision 18-bit analog-to-digital conversion circuit 15 with an MCP3421 chip as a core is designed. The analog voltage signal output from the weak current amplifying circuit 14 is converted into a digital signal. Vin + and Vin-are differential signal input pins, where the input voltage is current limited through R _ AD _ IN1 into the Vin + pin, which is grounded. VSS is the ground pin and VDD is the positive power pin. SCL is the serial clock input pin of IIC interface, and SDA is the two-way serial data pin of IIC interface, because SCL and SDA pin are the drain-source open circuit N channel driver, consequently SCL and SDA pin and VCC line between add pull resistance R _ AD1 and R _ AD2 respectively, guarantee the stability of IIC communication.
The analog-to-digital conversion circuit 15 converts the analog signal output by the weak current amplification circuit 14 into a digital signal, and the microprocessor 16MCU performs signal acquisition, data processing, protocol transmission, and data transmission.
In this embodiment, the data transmission module 2 is a GPRS-DTU. The microprocessor 16 collects the digital signals sent by the analog-to-digital conversion circuit 15, processes the data, then sends the processed data to a Modbus protocol and sends the processed data to the GPRS-DTU, and the GPRS-DTU sends the data to a cloud server of a cloud platform through a GPRS network of the mobile internet, so that remote data transmission, storage and analysis are realized.
The cloud platform comprises a network communication module 31 for signal connection with the data transmission module 2 and a protocol processing module 32 connected with the network communication module 31. Firstly, equipment access is completed, then the cloud platform module 3 actively sends a reading instruction to the formaldehyde concentration measuring module 1 through the network communication module 31, the equipment returns data, and the protocol processing module 32 completes analysis, storage, alarm and the like according to data point rules. And finally, the user can obtain the concentration parameters of the formaldehyde in the air in real time in a monitoring center, App or a WeChat small program. The core of the whole communication process is Modbus protocol transmission in the MCU 16, including receiving and sending Modbus protocol data.
Referring to fig. 6 to 8 again, the present invention further provides an air formaldehyde distributed cloud monitoring method, which includes the following steps:
the cloud platform module 3 sends a command for requesting to inquire the formaldehyde concentration to the formaldehyde concentration measurement module 1 through the data transmission module 2;
the formaldehyde concentration measuring module 1 receives and analyzes the request instruction, measures the formaldehyde concentration in the air according to the analyzed request instruction, and generates a corresponding data instruction according to the measured formaldehyde concentration and sends the data instruction to the cloud platform module 3;
and adding a check code CRC when the formaldehyde concentration measurement module 1 sends a data instruction to the cloud platform module 3.
Specifically, the method further comprises:
the cloud platform module 3 sends a command for requesting to inquire the formaldehyde concentration to the formaldehyde concentration measurement module 1 through the data transmission module 2;
the formaldehyde concentration measuring module receives a request instruction through an interrupt receiving program in the microprocessor 16 to interrupt the allowable position 1 of the mark register, sends the received request instruction to a receiving cache area, and starts timing after a timer is initialized;
the timer is preset with a timing value range, and if the receiving buffer receives the request instruction in the timing value range, it is determined that the microprocessor 16 receives the request instruction.
In this embodiment, the cloud platform module 3 sends an instruction requesting for inquiring the formaldehyde concentration to the MCU through the GPRS-DTU, and the MCU receives the instruction through the interrupt receiving program. When the instruction is received, interrupting the allowable position 1 of the MCU flag register and sending the received instruction to a receiving cache region, then initializing a timer and starting timing, wherein the timing of the timer is 3.5T (T is the time required for sending the instruction), if the instruction is received within 3.5T, the MCU determines a request instruction sent by the cloud platform through the GPRS-DTU, otherwise, the timer restarts the timing, and whether the instruction is completely received is continuously judged.
Specifically, the method further comprises:
the microprocessor 16 has a sub-machine address, when the address code in the request instruction is the same as the address code of the sub-machine address, the microprocessor 16 continues to analyze the request instruction and analyzes the function code;
when the function code is 03, the microprocessor 16 executes an operation of reading data, and automatically generates a check code CRC when sending a return instruction to the cloud platform module 3.
The GPRS-DTU firstly sends an instruction for requesting to inquire the formaldehyde concentration to the MCU, and the MCU analyzes the request instruction after obtaining the request instruction. The MCU has a sub-machine address, when the address code in the command is the same as that of the address of the MCU, the MCU can continue to analyze the request command and analyze the function code, when the function code is 03, the operation of reading data is executed, a check code CRC is automatically generated, and finally a return command is generated and sent to the cloud server of the cloud platform module 3 through the GPRS-DTU.
In summary, the following steps: the utility model realizes the real-time monitoring of a plurality of formaldehyde concentrations in the area to be measured by arranging a plurality of formaldehyde concentration measuring modules 1, and solves the problems of few measuring nodes and short effective monitoring distance of the prior formaldehyde measuring system; the method for processing the formaldehyde data based on the cloud platform realizes real-time analysis and storage of large data volume and solves the key problem of weak data processing capability in the existing formaldehyde monitoring system.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. The air formaldehyde distributed cloud monitoring system is characterized by comprising a plurality of formaldehyde concentration measuring modules, a data transmission module and a cloud platform module, wherein the formaldehyde concentration measuring modules are used for measuring concentration data of formaldehyde in air, packaging the concentration data through the data transmission module and transmitting the packaged concentration data to the cloud platform module, and the cloud platform module receives and analyzes the data packets and displays and stores the analyzed data;
the formaldehyde concentration measuring module comprises a microprocessor, a formaldehyde concentration measuring circuit, a weak current amplifying circuit and an analog-to-digital conversion circuit, wherein a current signal generated in the formaldehyde concentration measuring circuit is amplified by the weak current amplifying circuit and then is transmitted to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit converts the amplified current signal into a digital signal and then transmits the digital signal to the microprocessor, and the microprocessor receives the digital signal and transmits the digital signal to the data transmission module.
2. The air formaldehyde distributed cloud monitoring system of claim 1, wherein the formaldehyde concentration measurement circuit is an electrochemical formaldehyde sensor that converts the formaldehyde concentration into a corresponding current signal after detecting the formaldehyde concentration in the air.
3. The air formaldehyde distributed cloud monitoring system of claim 1, wherein the formaldehyde concentration measurement module further comprises a power circuit and a voltage reduction circuit connected to the power circuit for reducing a voltage value of the power circuit.
4. The air formaldehyde distributed cloud monitoring system of claim 3, wherein the voltage reduction circuit comprises a first stage voltage reduction circuit and a second stage voltage reduction circuit, the first stage voltage reduction circuit reduces the voltage to output a first reduced voltage value, the second stage voltage reduction circuit comprises a first voltage reduction circuit and a second voltage reduction circuit, the first voltage reduction circuit reduces the voltage of the first reduced voltage value to output a second reduced voltage value, and the second voltage reduction circuit reduces the voltage of the first reduced voltage value to output a third reduced voltage value.
5. The air formaldehyde distributed cloud monitoring system of claim 4, wherein the first pressure reduction value is 5.5V, the second pressure reduction value is 5V, and the third pressure reduction value is 3.3V.
6. The air formaldehyde distributed cloud monitoring system of claim 1, wherein the cloud platform comprises a network communication module in signal connection with the data transmission module and a protocol processing module connected with the network communication module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920443084.4U CN210119462U (en) | 2019-04-03 | 2019-04-03 | Air formaldehyde distributed cloud monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920443084.4U CN210119462U (en) | 2019-04-03 | 2019-04-03 | Air formaldehyde distributed cloud monitoring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210119462U true CN210119462U (en) | 2020-02-28 |
Family
ID=69612576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920443084.4U Active CN210119462U (en) | 2019-04-03 | 2019-04-03 | Air formaldehyde distributed cloud monitoring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210119462U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946354A (en) * | 2019-04-03 | 2019-06-28 | 苏州市计量测试院 | Air formaldehyde distribution cloud monitors system and method |
-
2019
- 2019-04-03 CN CN201920443084.4U patent/CN210119462U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946354A (en) * | 2019-04-03 | 2019-06-28 | 苏州市计量测试院 | Air formaldehyde distribution cloud monitors system and method |
| CN109946354B (en) * | 2019-04-03 | 2024-03-15 | 苏州市计量测试院 | Air formaldehyde distributed cloud monitoring system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104181280A (en) | Water quality monitoring node based on WSN | |
| CN210119462U (en) | Air formaldehyde distributed cloud monitoring system | |
| CN203349869U (en) | Henhouse environment wireless monitoring system | |
| CN109946354B (en) | Air formaldehyde distributed cloud monitoring system and method | |
| CN105806505A (en) | GSM-based high-precision remote temperature monitoring system | |
| CN104730215A (en) | Gas detection digital bridge and detection processing method thereof | |
| CN101158604A (en) | Humiture measurement mechanism | |
| CN205749391U (en) | A kind of toxic and harmful detector system | |
| CN202362263U (en) | Novel intelligent gas detector | |
| CN213041771U (en) | Water sample pH value detector | |
| CN203396701U (en) | Sensor node device for methane content WSN (wireless sensor network) | |
| CN205426376U (en) | Long -range wireless programme -controlled intelligent temperature transmitter | |
| CN103499938A (en) | Control system applied to NH3-N water quality online automatic monitor | |
| Tianpei et al. | A Design of PH3 Monitoring System Based on NB-IoT [C] | |
| Zhou et al. | The research of carbon dioxide gas monitoring platform based on the wireless sensor networks | |
| CN206724997U (en) | A kind of humiture transducer with radio communication function | |
| CN218330320U (en) | Contact temperature measuring device | |
| Alduais et al. | Implementation and analysis of an updating data strategy on IoT-Waspmote Gases Testbed with 2.4 GHz XBee for Air Quality Application | |
| Chen et al. | A Design of Industrial Park Environment Monitoring System Based on NB-IoT | |
| Bu et al. | Research on High Precision pH Sensing Device Based on Cloud Platform Service | |
| CN204576783U (en) | Based on the radio transmitting device of X-bee | |
| CN217237860U (en) | Wisdom orchard soil moisture content monitoring system based on loRa technique | |
| Zhao et al. | The research about detection of dissolved oxygen in water based on C8051F040 | |
| Lihao et al. | Design and test of a high precision digital CO monitor | |
| Zhenfeng et al. | A WIRELESS REMOTE MONITORING SENSOR FOR AGRICULTURAL ENVIRONMENT BASED ON NB-IoT. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |