Intelligent radar wireless water level gauge

Abstract

The utility model discloses a kind of intelligent radar wireless water level gauge, including shell (11);It is in the shell (11) for gathering obtain water level gauge three degrees of freedom and calculate its inclination angle information of inclination sensor (8);Radar sensor (7) is equipped in the bottom of the shell (11);And PCBA mainboard (9) in the shell (11), and the MCU circuit (3) and LoRa wireless communication circuit (6) connected with this PCBA mainboard (9), the MCU circuit (3) is connected to the radar sensor (7) pin by pin, for sending data to radar module or accepting radar module data, and data transmission is realized by the LoRa wireless communication circuit (6).The utility model passes through reasonable circuit design and chip function, low voltage and charging saturation protection are carried out to storage battery simultaneously, ensure the stable operation of equipment and the service life of battery.

Description

Technical Field

[0001] This utility model belongs to the field of water level measurement technology, and more specifically, relates to an intelligent radar wireless water level gauge. Background Technology

[0002] Water safety issues have become increasingly prominent in recent years. Problems such as insufficient equipment accuracy, slow response, and inconvenient deployment often lead to inaccurate and untimely water level data collection, failing to meet the needs of modern water management. Against this backdrop, an intelligent radar wireless water level gauge has emerged. It can monitor water level changes in real time and accurately, and transmit data back wirelessly in a timely manner. It is widely applicable to water conservancy projects, urban flood control, and agricultural irrigation, providing strong protection for water safety.

[0003] In traditional water level monitoring, strong electromagnetic interference can easily lead to signal transmission distortion in high-pressure environments such as deep reservoirs. In confined spaces like urban manholes, cable installation faces challenges such as high construction difficulty and long construction periods. Furthermore, in long-term field monitoring scenarios, exposed transmission cables are prone to aging and damage, and theft and battery theft are particularly prominent issues. These technical shortcomings make it difficult to balance reliability and economy in traditional water level monitoring systems under complex environments. For example, patent document CN215413937U discloses a wireless water level gauge system that improves assembly efficiency and measurement accuracy through a threaded connection between the measuring rod and the mounting rod, as well as the connection design of the sensing strip.

[0004] However, the patent document CN215413937U still has the following technical problems: (1) The waterproofness and stability of the equipment are not fully considered, which affects the measurement accuracy and equipment life; (2) The water level gauge lacks an efficient wireless communication and independent power supply system, which limits its application in remote areas or in situations where wiring is difficult. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this utility model provides an intelligent radar wireless water level gauge, comprising a main body, a housing on the top of the main body, a control integrated circuit board (PCBA) main board inside the housing, an expansion port, a power port, and a debugging port reserved at the bottom of the housing, and a battery box connected to the bottom of the housing. The battery box has a built-in power supply and a power port on its surface. The main body also has a solar panel. Through reasonable circuit design and chip function, this circuit can effectively manage the charging process of the solar panel, while providing low voltage and charge saturation protection for the battery, ensuring stable operation of the device and extending the battery's lifespan.

[0006] To achieve the above objectives, this utility model provides an intelligent radar wireless water level gauge, comprising:

[0007] case;

[0008] An inclination sensor is installed inside the housing to acquire the three degrees of freedom of the water level gauge and calculate its tilt angle information;

[0009] A radar sensor is installed at the bottom of the housing.

[0010] The PCBA motherboard is located inside the housing, and the MCU circuit and LoRa wireless communication circuit are connected to the PCBA motherboard. The MCU circuit is connected to the radar sensor pins through pins to send data to or receive data from the radar module, and to realize data transmission through the LoRa wireless communication circuit.

[0011] Furthermore, it also includes a data storage circuit connected to the PCBA motherboard.

[0012] Furthermore, it also includes a power conditioning circuit connected to the PCBA motherboard.

[0013] Furthermore, the power supply conditioning circuit includes a solar charge and discharge management circuit.

[0014] Furthermore, it also includes a Bluetooth communication circuit connected to the PCBA motherboard.

[0015] Furthermore, the housing is provided with a radar sensor mounting plate for mounting the tilt sensor.

[0016] Furthermore, the bottom of the housing is provided with an expansion port, a power port, and a debugging port.

[0017] Furthermore, a battery compartment is provided at the bottom of the outer casing, and a power port is provided on the battery compartment.

[0018] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects:

[0019] (1) The water level gauge of this utility model includes a body, a shell is provided on the top of the body, a control integrated circuit board PCBA main board is provided inside the shell, an expansion port, a power port and a debugging port are reserved at the bottom of the shell, and the bottom of the shell is also connected to a battery box. The battery box has a built-in power supply and a battery box power port is provided on the battery box. The body is also provided with a solar panel. Through reasonable circuit design and chip function, the circuit can effectively manage the charging process of the solar panel, and at the same time provide low voltage and charge saturation protection for the battery, so as to ensure the stable operation of the equipment and the service life of the battery.

[0020] (2) The water level gauge of this utility model, the wireless radar water level gauge adopts LoRa wireless communication and integrates core circuits such as solar charging and discharging management circuit and radar sensor, thereby realizing the independent data acquisition and data communication functions of the entire radar wireless water level gauge.

[0021] (3) The water level gauge of this utility model uses a chip to detect the voltage / current of the solar panel and adjust the impedance matching in real time to maximize the output power, thereby realizing MPPT dynamic tracking.

[0022] (4) The water level gauge of this utility model uses SGM61410 as the core device in the voltage conditioning circuit. The efficiency of the synchronous step-down regulator is greatly improved. In order to suppress the instantaneous current change during communication and avoid the instantaneous current change during the operation of the communication circuit, which would lead to the instability of the power supply system, the entire system is guaranteed to work stably. Attached Figure Description

[0023] Figure 1 This invention relates to an intelligent radar wireless water level gauge.

[0024] Figure 2 This is a circuit functional diagram of an intelligent radar wireless water level gauge according to an embodiment of the present invention;

[0025] Figure 3 This is a flowchart illustrating the operation of the intelligent radar wireless water level gauge in this embodiment of the present invention.

[0026] Figure 4 This is the core circuit of the MCU in the embodiment of this utility model;

[0027] Figure 5 This is the solar charge and discharge management circuit in the embodiment of this utility model;

[0028] Figure 6 This is a voltage conditioning circuit in an embodiment of the present invention.

[0029] In all the accompanying drawings, the same reference numerals indicate the same technical features, specifically: 1-Solar charging and discharging management circuit, 2-Power supply conditioning circuit, 3-MCU circuit, 4-Data storage circuit, 5-Bluetooth communication circuit, 6-LoRa wireless communication circuit, 7-Radar sensor, 8-Tilt sensor, 9-PCBA main board, 10-Radar sensor mounting plate, 11-Housing. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1This utility model provides an intelligent radar wireless water level gauge, including a housing 11. Inside the housing 11 is a control integrated circuit board (PCBA) main board 9, and connected to the PCBA main board 9 are a solar charging / discharging management circuit 1, a power conditioning circuit 2, an MCU circuit 3, a data storage circuit 4, a Bluetooth communication circuit 5, and a LoRa wireless communication circuit 6. The housing 11 also contains a radar sensor mounting plate 10, on which a tilt sensor 8 is mounted. This sensor collects and calculates the tilt angle measured by the radar sensor in the X, Y, and Z directions, as well as the current device status. Furthermore, a radar sensor 7 is located at the bottom of the housing 11. The MCU core circuit is connected to the radar sensor module pins via pins to send or receive data from the radar module, enabling bidirectional data communication between the MCU and the radar sensor. The bottom of the housing 11 has reserved expansion ports, a power port, and a debugging port. The bottom of the housing is also connected to a battery box, which has a built-in power supply and a power port. A solar panel is also mounted on the main body. Figure 2 As shown, PCBA motherboard 9 includes an STM32L431RCT6 chip. The inputs of the STM32L431RCT6 chip are connected to the built-in sensors, external expansion interfaces, solar charge / discharge management circuitry, voltage conditioning circuitry, Bluetooth communication circuitry, radar sensing circuitry, and tilt sensor circuitry. The outputs of the STM32L431RCT6 chip are also connected to a LoRa wireless communication module. Specifically, the solar panel is connected to the VPAD input to provide charging input for the circuit. The VBAT port is connected to the battery for charging and discharging when needed. The Vpow port outputs a stable voltage for use by subsequent voltage conditioning circuitry. Pin 1 of the CN3795 chip is connected to the input of a related circuit via resistor R20 and diode LED3; this connection may be used for charging status indication or other control signal transmission. Capacitor C9 is connected between the input and ground, acting as a filter to help stabilize the chip's input voltage. Pin 4 is connected to the input of the relevant circuit. A lithium battery is connected in series between pins 3 and 2, with the negative terminal of the lithium battery grounded to ensure normal operation and safety protection of the circuit. Through reasonable circuit design and chip function, this circuit can effectively manage the charging process of the solar panel, while providing low voltage and charge saturation protection for the battery, ensuring stable operation of the equipment and extending battery life.

[0032] like Figure 4As shown, the input terminals of the STM32L431RCT6 chip are also connected to a data storage circuit, which uses SPI communication. One end of the SPI_MOSO signal line is connected to pin 35 of the STM32L431RCT6 chip, and the other end is connected to pins 2 of the MB85RS64PNF and W25Q128 chips respectively. One end of the SPI_MISO signal line is connected to pin 36 of the STM32L431RCT6 chip, and the other end is connected to pins 5 of the MB85RS64PNF and W25Q128 chips respectively. One end of the SPI_CLK signal line is connected to pin 34 of the STM32L431RCT6 chip, and the other end is connected to pins 6 of the two data storage module chips respectively. The SPI_CLK clock signal is generated by the master device MCU for synchronous data transmission.

[0033] like Figure 4 As shown, the Bluetooth communication circuit primarily uses UART (Universal Asynchronous Receiver / Transmitter) communication. Through the serial peripheral interface Bluetooth_USART_TX, one end is connected to pin 24 of the MCU core circuit, and the other end is connected to pin 15 of the N32WB031 Bluetooth module chip, enabling data output from the host MCU to the Bluetooth communication module. Through the serial peripheral interface Bluetooth_USART_RX, one end is connected to pin 25 of the MCU core circuit, and the other end is connected to pin 14 of the N32WB031 Bluetooth module chip, enabling data input from the Bluetooth communication module to the host MCU.

[0034] like Figure 4 As shown, the LoRa wireless communication circuit mainly adopts UART communication. Through the serial peripheral interface RF_M1, one end is connected to pin 29 of the MCU core circuit, and the other end is connected to pin 3 of the LoRa module E32-TTL-100, realizing data output from the master device MCU to the LoRa communication module. Through the serial peripheral interface RF_M0, one end is connected to pin 30 of the MCU core circuit, and the other end is connected to pin 4 of the LoRa module E32-TTL-100, realizing data input from the LoRa communication module to the master device MCU.

[0035] like Figure 4 As shown, the radar sensor circuit primarily uses UART communication. The MCU core circuit is connected to pin 2 of the J6 radar sensor module chip via pin 16 to send data to the radar module; simultaneously, the MCU core circuit is connected to pin 1 of the J6 radar sensor module chip via pin 17 to receive data sent by the radar module. This connection method enables bidirectional data communication between the MCU and the radar sensor.

[0036] like Figure 4 As shown, the MCU core circuit communicates with the ADXL345 accelerometer sensor via the IIC interface. The serial peripheral interface SDA connects to pin 41 of the MCU core circuit on one end and pin 13 of the ADXL345 tilt sensor module on the other end for bidirectional data transmission. The serial peripheral interface SCL connects to pin 42 of the MCU core circuit on one end and pin 14 of the ADXL345 tilt sensor module on the other end for synchronous data transmission. Built-in sensors include a tilt accelerometer sensor; the external expansion interface connects to a radar level gauge. The wireless communication module supports 4G / 5G and LoRa communication. The battery box contains a lithium battery.

[0037] like Figure 6 As shown, the voltage conditioning circuit comprises two circuits, both using the SGM61410 as the core component. It conditions the Vpow voltage signal output from the solar charge / discharge management circuit to a stable voltage. One conditioning circuit outputs V33 voltage to power the entire radar wireless water level gauge circuit. The other conditioning circuit outputs V33FS voltage to power the LoRa wireless communication circuit. Providing a separate power conditioning circuit for the LoRa wireless communication circuit avoids excessive instantaneous current fluctuations during communication circuit operation that could lead to power instability. Furthermore, it can be adapted to different output voltages for different LoRa modules, such as 5V.

[0038] Figure 5 The solar charge and discharge management circuit in Figure 6 The voltage conditioning circuit is closely connected to the solar charge / discharge management circuit, with the Vpow output providing the input voltage. Specifically, the solar charge / discharge management circuit manages the electrical energy from the solar panel, and after processing by the CN3795 chip, outputs a stable voltage from the Vpow port. This voltage is then fed into the voltage conditioning circuit. The SGM61410 chip in the voltage conditioning circuit conditions the input Vpow voltage, generating stable V33 and V33FS voltages, providing the necessary stable power to various circuit modules on the PCBA motherboard and the LoRa wireless communication circuit. The CN3795 chip in the solar charge / discharge management circuit has MPPT functionality. Its pin 1 is connected to the input of the relevant circuit through resistor R20 and diode LED3. One end of capacitor C9 is also connected between the input and pin 1, with the other end of C9 grounded. Pin 4 is connected to the input of the relevant circuit. A lithium battery is connected in series between pins 3 and 2, with the negative terminal of the lithium battery grounded, i.e., pin 2 is grounded. This circuit connects to a solar panel to manage the charging and discharging of the device, enabling functions such as low voltage protection and charge saturation protection.

[0039] In this invention, the solar panel is attached to an external solar panel bracket and connected to a charging transient voltage suppression simulation circuit to manage the charging and discharging of the device. When the lithium battery voltage is below 4V, low voltage protection is activated to stop power supply to the device, ensuring that the battery voltage is not damaged. When the lithium battery voltage is above 12V and the lithium battery voltage reaches saturation, charging is stopped again to protect the battery voltage.

[0040] The data storage circuit mainly consists of two memory chips: the ferroelectric RAM (FRAM) chip MB85RS64PNF and the FLASH memory chip W25Q128. The MB85RS64PNF has a storage capacity of 8KB and is used to store all operating parameters, temporary variables, and event records of the integrated radar level gauge. Its CS pin is connected to the FRAM_CS signal, the VCC pin is connected to the V33 power supply, the SO pin is connected to the SPI_MISO signal, the SI pin is connected to the SPI_MOSI signal, the SCK pin is connected to the SPI_CLK signal, the HOLD and WP pins are connected to the V33 power supply, and the VSS pin is grounded. The W25Q128 has a storage capacity of 16MB and is used to store timed data records from the radar level gauge. Its CS pin is connected to the FLASH_CS signal, the Vcc pin is connected to the V33 power supply, the Q pin is connected to the SPI_MISO signal, the D pin is connected to the SPI_MOSI signal, the C pin is connected to the SPI_CLK signal, the HOLD and WP pins are connected to the V33 power supply, and the Vss pin is grounded. Both circuits interact with the MCU via the SPI bus to achieve data storage and retrieval functions.

[0041] The working principle of the intelligent radar wireless water level gauge can be divided into the following four steps: First, the wireless radar water level gauge adopts LoRa wireless communication and integrates core circuits such as solar charging and discharging management circuit and radar sensor, thereby realizing the independent data acquisition and data communication functions of the entire radar wireless water level gauge.

[0042] The second step involves the solar charge / discharge management circuit utilizing the CN3795 chip to detect the solar panel voltage / current and adjust impedance matching in real time to maximize output power, thereby achieving MPPT dynamic tracking. Since the VBAT terminal supports lithium batteries, lithium iron phosphate batteries, and lithium titanate batteries, it automatically switches to battery power when solar energy is insufficient, achieving seamless switching between dual power sources. Furthermore, the system also incorporates overcharge and over-discharge protection mechanisms. The solar charge / discharge management circuit provides an independent power supply system for the intelligent wireless radar level gauge.

[0043] The third step involves a voltage conditioning circuit using the SGM61410 as the core component. This significantly improves the efficiency of the synchronous buck regulator. To suppress sudden current surges during communication and prevent instability caused by instantaneous current changes in the communication circuit, the entire system operates stably. The anti-interference design consists of two circuits: one circuit, designed for loads such as MCUs / sensors, employs a low-ripple design; the other circuit, for loads such as LoRa modules, has an independent LC filter to resist current surges.

[0044] The fourth step involves the MCU core circuit initially initializing the MCU system after power-on. Next, it obtains operating parameters from the data storage circuit. Following this, it initializes the Bluetooth communication circuit, LoRa wireless communication circuit, radar sensor circuit, and tilt sensor circuit according to these parameters. Then, it acquires the RTC time and checks if data acquisition and reporting are required. If not, the timed data acquisition does not need to be reported. Otherwise, it proceeds to the next step: Is it time for data acquisition? If so, it performs data acquisition, including the tilt angle calculated from the X, Y, and Z directions by the tilt sensor, the water level information measured by the radar sensor, and the current device status. After acquisition, it continues to the next step: Is there a communication request? If so, it responds to the communication request from the gateway or data acquisition unit, then returns to the step checking for data acquisition and reporting before continuing. Otherwise, it returns directly to that step.

[0045] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An intelligent radar wireless water level gauge characterized by, include: Shell (11); An inclination sensor (8) is installed inside the housing (11) to collect the three degrees of freedom of the water level gauge and calculate its tilt angle information. A radar sensor (7) is provided at the bottom of the housing (11). And a PCBA motherboard (9) located inside the housing (11), an MCU circuit (3) and a LoRa wireless communication circuit (6) connected to the PCBA motherboard (9), the MCU circuit (3) being connected to the radar sensor (7) pins via pins, for sending data to or receiving data from the radar module, and for transmitting data via the LoRa wireless communication circuit (6).

2. The intelligent radar wireless water level gauge according to claim 1, characterized in that, It also includes a data storage circuit (4) connected to the PCBA motherboard (9).

3. An intelligent radar wireless water level gauge according to claim 2, characterized in that, It also includes a power conditioning circuit (2) connected to the PCBA motherboard (9).

4. The intelligent radar wireless water level gauge according to claim 3, characterized in that, The power supply conditioning circuit (2) includes a solar charge and discharge management circuit (1).

5. A smart radar wireless water level gauge according to any one of claims 1-4, characterized in that, It also includes a Bluetooth communication circuit (5) connected to the PCBA motherboard (9).

6. A smart radar wireless water level gauge according to any one of claims 1-4, characterized in that, The housing (11) is provided with a radar sensor mounting plate (10) for mounting the tilt sensor (8).

7. A smart radar wireless water level gauge according to claim 6, characterized in that, The bottom of the housing (11) is provided with an expansion port, a power port and an debugging port.

8. A smart radar wireless water level gauge according to claim 7, characterized in that, The bottom of the housing (11) is provided with a battery box, and the battery box is provided with a power port.

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