Water quality data acquisition instrument

Abstract

The utility model relates to the technical field of acquisition instruments and communication, particularly provides a water quality data acquisition instrument, and aims to solve the problem of unstable work of an acquisition instrument in the prior art. The battery pack comprises a battery module, the voltage conversion module is connected with the battery module; the voltage conversion module comprises a boost circuit and a buck circuit; the main control module is connected with the step-down circuit; the NB communication module or the WIFI communication module is connected with the main control module; the sensor communication module is connected with the main control module; and the display module is connected with the main control module. According to the utility model, the water quality data of the sensor can be remotely read and uploaded to the cloud platform, and the data transmission process is higher in stability, more reliable and low in power consumption, and can be flexibly applied to various environments. In addition, the NB communication module is low in power consumption, so that the working time of the acquisition instrument can be prolonged. The WIFI communication coverage is wide, the data transmission rate is high, and the water quality data can be uploaded to the cloud platform in real time to be stored.

Description

Technical Field

[0001] This utility model belongs to the field of data acquisition and communication technology, and specifically relates to a water quality data acquisition instrument. Background Technology

[0002] Water quality data acquisition instruments typically involve connecting to sensors to obtain the water quality data detected by the sensors, and uploading the water quality data to a cloud platform or backend. However, during the communication data transmission process, most existing water quality data acquisition instruments use traditional GPRS or 4G communication, which consumes a lot of power and easily leads to rapid battery depletion, affecting the device's operating time. In addition, if operating in remote areas or areas with weak signals, traditional GPRS or 4G communication cannot guarantee a stable connection for the acquisition instrument, resulting not only in the inability to upload data in real time and delays during transmission, but also in data transmission failures, affecting usability. Utility Model Content

[0003] This invention provides a water quality data acquisition instrument, which aims to solve the problem of unstable operation of existing acquisition instruments.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a water quality data acquisition instrument, including:

[0006] Battery module;

[0007] A voltage conversion module is connected to the battery module; the voltage conversion module includes a boost circuit and a buck circuit.

[0008] The main control module is connected to the output terminal of the step-down circuit;

[0009] The device includes either an NB communication module or a WIFI communication module; the NB communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the NB communication module; or, the WIFI communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the WIFI communication module.

[0010] A sensor communication module is connected to the main control module; the data acquisition instrument communicates with the sensor through the sensor communication module.

[0011] The display module is connected to the main control module and is used to display water quality data.

[0012] A further solution: The main control module includes an STM32F072C8T6 chip; pins 1, 9, 24 and 48 of the STM32F072C8T6 chip are all connected to the output of the step-down circuit.

[0013] Based on the above solution, the STM32F072C8T6 chip is connected to the output terminal of the step-down circuit, which can meet the voltage requirements of the STM32F072C8T6 chip and ensure that the STM32F072C8T6 chip can operate stably.

[0014] A further solution: When the data acquisition device communicates with the cloud platform through the NB communication module, the NB communication module includes a USIM communication circuit and a BC260YCNQA-I03-CNASA chip; the USIM communication circuit includes a serial port level matching circuit, a NANO SIM XG6P H1.35 clip, and an external SIM IoT communication card mounted on the NANO SIM XG6P H1.35 clip;

[0015] The MCU RXD terminal of the serial port level matching circuit is connected to pin 12 of the STM32F072C8T6 chip; the MCU TXD terminal of the serial port level matching circuit is connected to pin 13 of the STM32F072C8T6 chip; the TXD terminal of the serial port level matching circuit is connected to pin 18 of the BC260YCNQA-I03-CNASA chip; the RXD terminal of the serial port level matching circuit is connected to pin 17 of the BC260YCNQA-I03-CNASA chip; the VDD EXT terminal of the serial port level matching circuit is connected to pin 24 of the BC260YCNQA-I03-CNASA chip; pin 1 of the NANO SIM XG6PH1.35 latch is connected to pin 14 of the BC260YCNQA-I03-CNASA chip; the NANO SIM XG6PH1.35 latch... Pin 2 of the H1.35 latch is connected to pin 12 of the BC260YCNQA-I03-CNASA chip, pin 3 of the NANOSIM XG6P H1.35 latch is connected to pin 13 of the BC260YCNQA-I03-CNASA chip, and pin 7 of the NANO SIM XG6P H1.35 latch is connected to pin 11 of the BC260YCNQA-I03-CNASA chip.

[0016] Based on the above scheme, the NB communication method has low power consumption, which can extend the working time of the data acquisition device. Furthermore, using the USIM communication circuit for data encryption can improve the security of water quality data transmission.

[0017] A further solution: When the data acquisition device communicates with the cloud platform through the Wi-Fi communication module, the Wi-Fi communication module includes an ESP-12F chip;

[0018] Pin 15 of the ESP-12F chip is connected to pin 12 of the STM32F072C8T6 chip, and pin 16 of the ESP-12F chip is connected to pin 13 of the STM32F072C8T6 chip.

[0019] Based on the above scheme, the data acquisition device uses WIFI communication to upload data, which is convenient and has a high transmission rate, allowing for the transmission of large amounts of data.

[0020] A further solution: The WIFI communication module also includes an LDO voltage regulator module for independently powering the WIFI communication module; the voltage output terminal of the LDO voltage regulator module is connected to pin 8 of the ESP-12F chip.

[0021] Based on the above solution, the LDO voltage regulator module provides power to the WIFI communication module separately, enabling the WIFI communication module to obtain a more stable and sufficient voltage. It can also avoid interference from noise in other circuits, thereby ensuring the stability and reliability of the WIFI communication module.

[0022] A further solution: the sensor communication module is an RS485 communication module; the RS485 communication module includes an SP3485 chip;

[0023] Pin 1 of the SP3485 chip is connected to pin 31 of the STM32F072C8T6 chip, pins 2 and 3 of the SP3485 chip are both connected to pin 29 of the STM32F072C8T6 chip, and pin 4 of the SP3485 chip is connected to pin 30 of the STM32F072C8T6 chip.

[0024] Based on the above scheme, the RS485 communication has advantages such as anti-interference and high reliability, making it a better choice for communication between the data acquisition instrument and the sensor.

[0025] A further embodiment: The display module includes an OLED; the OLED is connected to pins 42 and 43 of the STM32F072C8T6 chip.

[0026] Based on the above solution, the display module enables the data acquisition instrument to display water quality data, making it convenient for users to view.

[0027] A further solution: The battery module uses a lithium battery for charging and discharging; the battery module includes an ETA9742E8A chip; pin 6 of the ETA9742E8A chip is connected to pin 1 of the lithium battery, and pin 7 of the ETA9742E8A chip outputs a 5V voltage.

[0028] Based on the above solution, the lithium battery is a one-piece charging and discharging unit, which is convenient and has a fast charging speed. Furthermore, the lithium battery offers better safety, featuring overcharge and over-discharge protection.

[0029] A further solution: The input terminal of the boost circuit is connected to pin 7 of the ETA9742E8A chip. The boost circuit receives a 5V voltage, boosts the 5V voltage to a 12V voltage, and outputs the voltage from the output terminal of the boost circuit.

[0030] The input terminal of the buck circuit is connected to the output terminal of the boost circuit; the buck circuit receives 12V voltage, reduces the 12V voltage to 3.3V voltage, and outputs it from the output terminal of the buck circuit.

[0031] Based on the above scheme, the boost circuit and the buck circuit can better meet the voltage requirements of different modules, ensure the stability of each module during operation, and protect the components in each module from voltage damage.

[0032] A further solution: a water quality data acquisition instrument, which also includes a 12V voltage output control module for controlling the sensor switch;

[0033] The 12V voltage output control module is connected to the main control module, and the input terminal of the 12V voltage output control module is connected to the output terminal of the boost circuit.

[0034] The beneficial effects of this utility model are as follows:

[0035] 1. The battery module of this utility model provides a stable voltage for the operation of the data acquisition device; the sensor communication module enables the data acquisition device to communicate with the sensor, thereby remotely reading the water quality data collected by the sensor; the display module can display the collected water quality data in real time, allowing users to grasp the data promptly and clearly, improving the convenience of the data acquisition device; the NB communication module or WIFI communication module enables the data acquisition device to upload the collected water quality data to the cloud platform. With the help of these modules, the data acquisition device of this utility model has higher stability, greater reliability, and lower power consumption, making it flexible and adaptable to various environments. Even in remote areas or areas with weak signals, the data acquisition device can work normally and stably.

[0036] 2. Compared to the GPRS or 4G communication used in existing data acquisition devices, this invention uses NB communication, which has lower power consumption, reducing the power consumption of the battery module and extending the working time of the data acquisition device. In addition to NB communication, this invention also uses WIFI communication, which has wide coverage and a high data transmission rate, enabling real-time uploading of water quality data to a cloud platform for storage.

[0037] 3. The boost circuit and buck circuit of the voltage conversion module in this utility model can meet the voltage requirements of each module, which can not only ensure the stability of the data acquisition instrument, but also extend the battery life to a certain extent. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the connection structure of each module of a water quality data acquisition instrument according to this utility model;

[0040] Figure 2 A schematic diagram of the circuit connection structure of the battery module in this utility model;

[0041] Figure 3 A schematic diagram of the circuit connection structure of the voltage conversion module in this utility model;

[0042] Figure 4 A schematic diagram of the circuit connection structure of the main control module in this utility model;

[0043] Figure 5 A schematic diagram of the circuit connection structure of the 12V voltage output control module in this utility model;

[0044] Figure 6 A schematic diagram of the circuit connection structure of the NB communication module in this utility model;

[0045] Figure 7 A schematic diagram of the circuit connection structure of the WIFI communication module in this utility model;

[0046] Figure 8 A schematic diagram of the circuit connection structure of the sensor communication module in this utility model;

[0047] Figure 9 A schematic diagram of the circuit connection structure of the display module in this utility model. Detailed Implementation

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0049] like Figure 1 As shown, this embodiment provides a water quality data acquisition instrument, including:

[0050] Battery module;

[0051] A voltage conversion module is connected to the battery module; the voltage conversion module includes a boost circuit and a buck circuit.

[0052] The main control module is connected to the output terminal of the step-down circuit;

[0053] The device includes either an NB communication module or a WIFI communication module; the NB communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the NB communication module; or, the WIFI communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the WIFI communication module.

[0054] A sensor communication module is connected to the main control module; the data acquisition instrument communicates with the sensor through the sensor communication module.

[0055] The display module is connected to the main control module and is used to display water quality data.

[0056] like Figure 2 As shown, a further example of the battery module is as follows: the battery module uses a lithium battery for charging and discharging; the battery module includes an ETA9742E8A chip; pin 6 of the ETA9742E8A chip is connected to pin 1 of the lithium battery, pin 7 of the ETA9742E8A chip outputs a 5V voltage, and pin 2 of the lithium battery is grounded.

[0057] Pin 1 of the ETA9742E8A chip is a switch pin, and it is connected to pin 19 of the STM32F072C8T6 chip via inductor L1.

[0058] In addition, the battery module also includes a USB port. The USB port can be used for Type-C charging or discharging; pin 1 of the USB port is connected to pin 7 of the ETA9742E8A chip, and pin 2 of the USB port is grounded.

[0059] like Figure 3 As shown, a further example of the voltage conversion module is as follows: the boost circuit increases the received 5V voltage to 12V and outputs it to power the sensor or LDO voltage regulator module; the buck circuit reduces the received 12V voltage to 3.3V and outputs it to power the main control module.

[0060] Specifically, the input terminal of the boost circuit is connected to pin 7 of the ETA9742E8A chip. The boost circuit receives a 5V voltage, boosts the 5V voltage to a 12V voltage, and outputs the voltage from the output terminal of the boost circuit. The boost circuit can use a SY7208ABC chip, which receives a 5V voltage and outputs a 12V voltage.

[0061] The input terminal of the buck circuit is connected to the output terminal of the boost circuit. The buck circuit receives a 12V voltage, reduces the 12V voltage to 3.3V, and outputs the 3.3V voltage. The buck circuit can employ an MP245 1DJ-LF-Z chip, which receives a 12V voltage and outputs a 3.3V voltage.

[0062] Based on the above solution, a water quality data acquisition instrument further includes a 12V voltage output control module for controlling the sensor switch; when the acquisition instrument is connected to the sensor to transmit the water quality data detected by the sensor, under the action of the main control module, the 12V voltage output control module can control the sensor to be turned on or off.

[0063] The 12V voltage output control module is connected to the main control module, and the input terminal of the 12V voltage output control module is connected to the output terminal of the boost circuit.

[0064] Specifically, such as Figure 4 As shown, the main control module includes an STM32F072C8T6 chip; pins 1, 9, 24 and 48 of the STM32F072C8T6 chip are all connected to the output terminal of the step-down circuit.

[0065] like Figure 5 As shown, the 12V voltage output control module includes two outputs, namely a first 12V voltage output circuit and a second 12V voltage output circuit.

[0066] The first 12V voltage output circuit includes Q1 (P-channel MOSFET) and Q2 (N-channel MOSFET). Pin D (drain) of Q1 is the output terminal (out1) of the first 12V voltage output circuit, and pin D of Q1 is connected to ground via capacitors C23 and C24; pin S (source) of Q1 is connected to the 12V voltage (output terminal of the boost circuit); pin G (gate) of Q1 is connected to pin D (drain) of Q2, and a resistor R13 is connected between pin S and pin G of Q1. Pin G (drain) of Q2 is connected to pin 45 of the STM32F072C8T6 chip; pin S (source) of Q2 is grounded, and a resistor R14 is connected between pin G and pin S of Q2.

[0067] The second 12V voltage output circuit includes Q3 (P-channel MOSFET) and Q4 (N-channel MOSFET). The drain pin (D) of Q3 is the output terminal (out2) of the second 12V voltage output circuit, and the drain pin of Q3 is connected to ground via capacitors C25 and C26. The source pin (S) of Q3 is connected to the 12V voltage (the output terminal of the boost circuit). The gate pin (G) of Q3 is connected to the drain pin (D) of Q4, and a resistor R15 is connected between the drain pin (S) and the gate pin (G) of Q3. The drain pin (G) of Q4 is connected to pin 46 of the STM32F072C8T6 chip; the source pin (S) of Q4 is grounded, and a resistor R16 is connected between the source pin (G) and the source pin (S) of Q4.

[0068] The data acquisition device can communicate with the cloud platform using two methods. In the first method, the data acquisition device communicates with the cloud platform through the NB communication module; in the second method, the data acquisition device communicates with the cloud platform through the WIFI communication module.

[0069] like Figure 6 and Figure 4 As shown, when the first scheme is adopted, the data acquisition device communicates with the cloud platform through the NB communication module. The NB communication module includes a USIM communication circuit and a BC260YCNQA-I03-CNASA chip. The USIM communication circuit includes a serial port level matching circuit, a NANO SIM XG6P H1.35 clip, and an external SIM IoT communication card set on the NANO SIM XG6P H1.35 clip.

[0070] Specifically, the serial port level matching circuit consists of an NPN transistor D1 and a resistor R4. The MCU RXD terminal (the collector of D1, which is connected to a 3.3V voltage via resistor R2) of the serial port level matching circuit is connected to pin 12 of the STM32F072C8T6 chip; the MCU TXD terminal (one end of resistor R4) of the serial port level matching circuit is connected to pin 13 of the STM32F072C8T6 chip; the TXD terminal (the emitter of D1) of the serial port level matching circuit is connected to pin 18 of the BC260YCNQA-I03-CNASA chip; the RXD terminal (the other end of resistor R4) of the serial port level matching circuit is connected to pin 17 of the BC260YCNQA-I03-CNASA chip; and the VDD terminal of the serial port level matching circuit... The EXT terminal (the base of D1, which is also connected to a resistor R3 and a capacitor C3 connected in parallel) is connected to pin 24 of the BC260YCNQA-I03-CNASA chip.

[0071] Pin 1 of the NANO SIM XG6P H1.35 latch is connected to pin 14 of the BC260YCNQA-I03-CNASA chip; pin 2 of the NANO SIM XG6P H1.35 latch is connected to pin 12 of the BC260YCNQA-I03-CNASA chip; pin 3 of the NANO SIM XG6P H1.35 latch is connected to pin 13 of the BC260YCNQA-I03-CNASA chip; and pin 7 of the NANO SIM XG6P H1.35 latch is connected to pin 11 of the BC260YCNQA-I03-CNASA chip.

[0072] Additionally, the external SIM IoT communication card can be connected to pins 1, 2, 3, and 7 of the NANO SIM XG6P H1.35 latch. Specifically, pin 1 (USIM VDD) of the NANO SIM XG6P H1.35 latch provides power to the external SIM IoT communication card; pin 2 (USIM RST) of the NANO SIM XG6P H1.35 latch is used for resetting the external SIM IoT communication card; pin 3 (USIM CLK) of the NANO SIM XG6P H1.35 latch provides the clock frequency for the external SIM IoT communication card; and pin 7 (USIM DATA) of the NANO SIM XG6P H1.35 latch is used for data communication with the external SIM IoT communication card.

[0073] like Figure 7 and Figure 4 As shown, when the second scheme is adopted, the data acquisition device communicates with the cloud platform through the WIFI communication module, and the WIFI communication module includes an ESP-12F chip;

[0074] Pin 15 of the ESP-12F chip is connected to pin 12 of the STM32F072C8T6 chip, and pin 16 of the ESP-12F chip is connected to pin 13 of the STM32F072C8T6 chip.

[0075] It should be noted that when the second scheme is adopted, the WIFI communication module also includes an LDO voltage regulator module for independently powering the WIFI communication module; the voltage output terminal of the LDO voltage regulator module is connected to pin 8 of the ESP-12F chip.

[0076] The LDO voltage regulator module can use an AMS1117-3.3V chip; pin 3 of the AMS1117-3.3V is connected to the output terminal of the boost circuit, pin 2 of the AMS1117-3.3V outputs a 3.3V voltage and is connected to pin 8 of the ESP-12F chip, and pin 1 of the AMS1117-3.3V is grounded; wherein, a capacitor C30 is connected between pin 1 and pin 2 of the AMS1117-3.3V, and a capacitor C31 is connected between pin 1 and pin 3 of the AMS1117-3.3V.

[0077] like Figure 8 and Figure 4 As shown, a further example of the sensor communication module is: the sensor communication module is an RS485 communication module; the RS485 communication module includes an SP3485 chip;

[0078] Pin 1 of the SP3485 chip is connected to pin 31 of the STM32F072C8T6 chip, pins 2 and 3 of the SP3485 chip are both connected to pin 29 of the STM32F072C8T6 chip, and pin 4 of the SP3485 chip is connected to pin 30 of the STM32F072C8T6 chip.

[0079] A resistor R18 is connected between pins 6 and 7 of the SP3485 chip; a bidirectional diode D2 and a resettable fuse F2 are connected in series at pin 6 of the SP3485 chip; a bidirectional diode D3 and a resettable fuse F3 are connected in series at pin 7 of the SP3485 chip, and the bidirectional diodes D2 and D3 are connected to ground. Pin 6 of the SP3485 chip is connected to a 3.3V voltage via a resistor R19; pin 7 of the SP3485 chip is connected to ground via a resistor R17.

[0080] Pin 8 of the SP3485 chip is connected to a 3.3V voltage. Additionally, pin 8 is connected to capacitor C27 and then grounded. Pin 5 of the SP3485 chip is grounded.

[0081] like Figure 9 and Figure 4 As shown, a further example of the display module is as follows: the display module includes an OLED; the OLED is connected to pins 42 and 43 of the STM32F072C8T6 chip. Specifically, pin 18 of the OLED is connected to pin 42 of the STM32F072C8T6 chip, and pins 19 and 20 of the OLED are connected to pin 43 of the STM32F072C8T6 chip.

[0082] This utility model is not limited to the above-mentioned optional embodiments. Under the premise of non-contradiction, the various solutions can be combined arbitrarily. Anyone can derive other forms of products under the guidance of this utility model. However, no matter what changes are made in their shape or structure, all technical solutions that fall within the scope of the claims of this utility model are within the protection scope of this utility model.

Claims

1. A water quality data acquisition instrument, characterized in that, include: Battery module; A voltage conversion module is connected to the battery module; the voltage conversion module includes a boost circuit and a buck circuit. The main control module is connected to the output terminal of the step-down circuit; The device includes either an NB communication module or a WIFI communication module; the NB communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the NB communication module; or, the WIFI communication module is connected to the main control module, and the data acquisition device communicates with the cloud platform through the WIFI communication module. A sensor communication module is connected to the main control module; the data acquisition instrument communicates with the sensor through the sensor communication module. The display module is connected to the main control module and is used to display water quality data.

2. The water quality data acquisition instrument according to claim 1, characterized in that, The main control module includes an STM32F072C8T6 chip; pins 1, 9, 24 and 48 of the STM32F072C8T6 chip are all connected to the output of the step-down circuit.

3. A water quality data acquisition instrument according to claim 2, characterized in that, When the data acquisition device communicates with the cloud platform through the NB communication module, the NB communication module includes a USIM communication circuit and a BC260YCNQA-I03-CNASA chip; the USIM communication circuit includes a serial port level matching circuit, a NANO SIM XG6P H1.35 clip, and an external SIM IoT communication card mounted on the NANO SIM XG6P H1.35 clip; The MCU RXD terminal of the serial port level matching circuit is connected to pin 12 of the STM32F072C8T6 chip; the MCU TXD terminal of the serial port level matching circuit is connected to pin 13 of the STM32F072C8T6 chip; the TXD terminal of the serial port level matching circuit is connected to pin 18 of the BC260YCNQA-I03-CNASA chip; the RXD terminal of the serial port level matching circuit is connected to pin 17 of the BC260YCNQA-I03-CNASA chip; the VDD EXT terminal of the serial port level matching circuit is connected to pin 24 of the BC260YCNQA-I03-CNASA chip; pin 1 of the NANO SIM XG6PH1.35 latch is connected to pin 14 of the BC260YCNQA-I03-CNASA chip; the NANO SIM XG6PH1.35 latch... Pin 2 of the H1.35 latch is connected to pin 12 of the BC260YCNQA-I03-CNASA chip, pin 3 of the NANOSIM XG6P H1.35 latch is connected to pin 13 of the BC260YCNQA-I03-CNASA chip, and pin 7 of the NANO SIM XG6P H1.35 latch is connected to pin 11 of the BC260YCNQA-I03-CNASA chip.

4. A water quality data acquisition instrument according to claim 2, characterized in that, When the data acquisition device communicates with the cloud platform through the WIFI communication module, the WIFI communication module includes an ESP-12F chip; Pin 15 of the ESP-12F chip is connected to pin 12 of the STM32F072C8T6 chip, and pin 16 of the ESP-12F chip is connected to pin 13 of the STM32F072C8T6 chip.

5. A water quality data acquisition instrument according to claim 4, characterized in that, The WIFI communication module also includes an LDO voltage regulator module for independently powering the WIFI communication module; the voltage output terminal of the LDO voltage regulator module is connected to pin 8 of the ESP-12F chip.

6. A water quality data acquisition instrument according to claim 2, characterized in that, The sensor communication module is an RS485 communication module; the RS485 communication module includes an SP3485 chip. Pin 1 of the SP3485 chip is connected to pin 31 of the STM32F072C8T6 chip, pins 2 and 3 of the SP3485 chip are both connected to pin 29 of the STM32F072C8T6 chip, and pin 4 of the SP3485 chip is connected to pin 30 of the STM32F072C8T6 chip.

7. A water quality data acquisition instrument according to claim 2, characterized in that, The display module includes an OLED; the OLED is connected to pins 42 and 43 of the STM32F072C8T6 chip.

8. A water quality data acquisition instrument according to claim 1, characterized in that, The battery module uses a lithium battery for charging and discharging; the battery module includes an ETA9742E8A chip; pin 6 of the ETA9742E8A chip is connected to pin 1 of the lithium battery, and pin 7 of the ETA9742E8A chip outputs a 5V voltage.

9. A water quality data acquisition instrument according to claim 8, characterized in that, The input terminal of the boost circuit is connected to pin 7 of the ETA9742E8A chip. The boost circuit receives a 5V voltage, boosts the 5V voltage to a 12V voltage, and outputs it from the output terminal of the boost circuit. The input terminal of the buck circuit is connected to the output terminal of the boost circuit; the buck circuit receives 12V voltage, reduces the 12V voltage to 3.3V voltage, and outputs it from the output terminal of the buck circuit.

10. A water quality data acquisition instrument according to claim 9, characterized in that, It also includes a 12V voltage output control module for controlling the sensor switch; The 12V voltage output control module is connected to the main control module, and the input terminal of the 12V voltage output control module is connected to the output terminal of the boost circuit.

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