CN214893547U - Resonant water depth sensor module - Google Patents
Resonant water depth sensor module Download PDFInfo
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- CN214893547U CN214893547U CN202120680683.5U CN202120680683U CN214893547U CN 214893547 U CN214893547 U CN 214893547U CN 202120680683 U CN202120680683 U CN 202120680683U CN 214893547 U CN214893547 U CN 214893547U
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Abstract
A resonant water depth sensor module is matched with an external resonant water level sensor and used for accurately measuring the depth of liquid; the circuit comprises a coupling network, a two-way inverter, a voltage division output circuit and an MCU; the coupling network, the two-way phase inverter, the voltage division output circuit and the MCU are sequentially connected to form a resonant water depth sensor module; the method comprises the steps that by utilizing the principle that resonant frequency of a resonant water level sensor changes due to different liquid depths, rectangular waves with the same frequency as the resonant frequency of the resonant water level sensor are output through the resonant water level sensor, a coupling network and an inverter, the rectangular waves are input into an MCU, and the MCU calculates the actually measured liquid depth according to the frequency of the input rectangular waves; the utility model discloses a resonant mode depth of water sensor module has circuit structure simple, with low costs, advantage that measurement accuracy is high, is convenient for use widely on a large scale.
Description
Technical Field
The utility model relates to a liquid degree of depth measures technical field, concretely relates to resonant mode depth of water sensor module.
Background
In the fields of industrial and agricultural production and domestic and household appliances, such as an agricultural liquid medicine spraying box, a household washing machine and the like, the liquid depth measuring technology can be applied; however, the existing liquid level depth sensor module is generally higher in price, so that a sensor module with low price and high measurement precision needs to be developed to meet the large-scale requirements in the fields of industrial and agricultural production and domestic household appliances.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiency in the background art, the utility model discloses a resonant water depth sensor module, it utilizes the principle that different liquid depths make resonance level sensor resonant frequency produce the change, through resonance level sensor, coupling network, the phase inverter output with resonance level sensor resonant frequency the same frequency's rectangular wave, with rectangular wave input MCU, MCU calculates the actual measurement's liquid depth according to the frequency of input rectangular wave; the utility model discloses a resonant mode depth of water sensor module has circuit structure simple, with low costs, advantage that measurement accuracy is high, is convenient for use widely on a large scale.
In order to realize the utility model aims at, the utility model adopts the following technical scheme: a resonant water depth sensor module is matched with an external resonant water level sensor and used for accurately measuring the depth of liquid; the resonant water level sensor is essentially an LC parallel resonant circuit, and the working principle of the resonant water level sensor is that the inductance of an inductance coil in the resonant water level sensor is changed by utilizing the pressure generated by the liquid level to be detected, so that the resonant frequency of the resonant water level sensor is changed, and then the actual resonant frequency of the resonant water level sensor is measured, so that the depth of the liquid to be measured can be calculated; the resonant water depth sensor module comprises a coupling network, a double-path phase inverter, a voltage division output circuit and an MCU; the coupling network, the two-way phase inverter, the voltage division output circuit and the MCU are sequentially connected to form a resonant water depth sensor module; the resonant water depth sensor module has the working principle that the resonant water level sensor transmits a resonant signal to the double-path phase inverter through the coupling network, the double-path phase inverter outputs rectangular waves with the same frequency as the resonant frequency of the resonant water level sensor, the rectangular waves are input into the MCU after passing through the voltage division output circuit, and finally the MCU calculates the actual liquid depth to be measured according to the frequency of the input rectangular waves.
Further, the resonant water level sensor is provided with A, B, C three output ends; the coupling network comprises three resistors R1, R2 and R3 which are connected in series, one ends of R1 and R2 are respectively connected with a A, B end of the resonant water level sensor, and a common connecting end of R1, R2 and R3 outputs a resonant signal of the resonant water level sensor; the output end C of the resonant water level sensor is grounded;
the two-way phase inverter comprises an inverter A and an inverter B; wherein the input terminal of the inverter A is connected to the common connection terminal of R1 and R3, and the output terminal of the inverter A is connected to the common connection terminal of R2 and R3; after a resonance signal of the resonance water level sensor passes through the reverser A, outputting a rectangular wave with the same frequency as the resonance frequency of the resonance water level sensor;
the input end of the inverter B is connected with the input end of the inverter A, the rectangular wave signal output by the inverter A is fed back to the input end of the inverter B through the resistor R3, and is output from the output end of the inverter B after being shaped by the inverter B, so that the waveform quality output by the inverter B is ensured.
Furthermore, the voltage division output circuit comprises two series-connected resistors R6 and R7, one end of the resistor R6 is connected with the output end of the inverter B, one end of the resistor R7 is grounded, and the common connecting end of the resistor R6 and the resistor R7 outputs a divided rectangular wave signal to be input into the MCU; the purpose of the voltage division output circuit is to ensure the matching of the output voltage of the reverser B and the working voltage of the MCU; the resistor R7 is connected with a filter capacitor C3 in parallel, and the purpose of the resistor R7 is to filter high-frequency interference input into MCU rectangular waves and ensure the accuracy of the MCU in measuring the output frequency of the resonant water level sensor.
Further, the MCU comprises a timer external clock input end T0, a serial port output end TXD and a serial port input end RXD; the external clock input end T0 of the timer is connected with the common connection end of R6 and R7, and is used for receiving the number of counting input rectangular waves and measuring the frequency output by the resonant water level sensor, and the specific working method is as follows: the method comprises the following steps that the number of input rectangular waves is recorded by the external clock input end T0 of a timer of the MCU, overflow is generated once when set N rectangular waves are recorded, an integer variable count is set to record the overflow times N in one second, the external clock input end T0 of the timer generates interruption once every one second, and the output frequency of the resonant water level sensor is calculated; the calculation formula is as follows:
wherein
The resonant frequency of the resonant water level sensor measured by the MCU;
the number of overflows recorded for the integer variable count in one second;
setting the number of rectangular waves recorded during overflow;
the number of the rectangular waves currently recorded when the external clock input end T0 of the timer is interrupted; specific examples are as follows; assuming that every 256 rectangular waves input at the external clock input end T0 of the timer overflow, and the total overflow time is eighty-eight times in one second, when the external clock input end T0 of the timer is interrupted, and the number of the rectangular waves recorded at present is 235, the resonant frequency of the resonant water level sensor measured by the MCU is:
hz; the method for calculating the liquid depth through the resonance frequency of the resonance water level sensor measured by the MCU comprises the following steps: before the resonant water depth sensor module is used, firstly, a plurality of liquid depths and the resonant frequency output by the corresponding resonant water level sensor are calibrated, then curve fitting is carried out on the calibrated liquid depths and the resonant frequency output by the corresponding resonant water level sensor to obtain a fitting curve relation, and the MCU can calculate the depth of the measured liquid through the measured resonant frequency of the resonant water level sensor according to the fitting curve relation.
Further, the device comprises a three-pin connector and a four-pin connector; the resonance water level sensor is connected with the coupling network through a three-pin connector; the four-pin connector comprises a power pin VCC, a ground pin GND, a serial port output pin TXD and a serial port receiving pin RXD, and the four-pin connector is respectively connected with a power supply, a ground and MCU serial port output end TXD and a serial port input end RXD of the resonant water depth sensor module; namely, the resonant water depth sensor module is connected with the resonant water level sensor through a three-pin connector, and the resonant water depth sensor module is connected with rear-end equipment through a four-pin connector; the data sent by the resonant water depth sensor module and the back-end equipment comprise the depth of a liquid to be measured and the measured frequency, and the data sending format is @ XXXXX # XXXXXX, wherein @ is a frequency frame header, and @ subsequent XXXXX is a frequency value; wherein # is a liquid depth frame header and # subsequent XXXX is a liquid depth value.
Further, the power supply indicating circuit comprises a current limiting resistor R9, a light emitting diode D1 and a filter capacitor C5 which are connected in series; the power supply indicating circuit is connected between a power supply VCC of the resonant water depth sensor module and a ground GND in series; the power supply indicating circuit is used for indicating the power-on state of the resonant water depth sensor module.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has: a resonant water depth sensor module is matched with an external resonant water level sensor and used for accurately measuring the depth of liquid; the circuit comprises a coupling network, a two-way inverter, a voltage division output circuit and an MCU; the coupling network, the two-way phase inverter, the voltage division output circuit and the MCU are sequentially connected to form a resonant water depth sensor module; the method comprises the steps that by utilizing the principle that resonant frequency of a resonant water level sensor changes due to different liquid depths, rectangular waves with the same frequency as the resonant frequency of the resonant water level sensor are output through the resonant water level sensor, a coupling network and an inverter, the rectangular waves are input into an MCU, and the MCU calculates the actually measured liquid depth according to the frequency of the input rectangular waves; the utility model discloses a resonant mode depth of water sensor module has circuit structure simple, with low costs, advantage that measurement accuracy is high, is convenient for use widely on a large scale.
Drawings
FIG. 1 is a schematic block diagram of a resonant water depth sensor module;
FIG. 2 is a schematic circuit diagram of a resonant water depth sensor module;
FIG. 3 is a schematic diagram of a resonant water level sensor circuit;
FIG. 4 is a circuit diagram of a coupling network;
FIG. 5 is a circuit diagram of a two-way inverter;
FIG. 6 is a wiring diagram of a voltage-dividing output circuit;
FIG. 7 is a wiring diagram of a power indication circuit;
FIG. 8 is a MCU wiring diagram.
In the figure: 1. a resonant water level sensor; 2. a coupling network; 3. a double-path inverter; 4. a voltage division output circuit; 5. MCU; 6. a three-pin connector; 7. a four-pin connector; 8. a power indication circuit.
Detailed Description
The invention will be explained in more detail by the following examples, which disclose the invention and are intended to protect all technical improvements within the scope of the invention.
A resonant water depth sensor module is matched with an external resonant water level sensor 1 and used for accurately measuring the depth of liquid; the resonant water depth sensor module comprises a coupling network 2, a double-path inverter 3, a voltage division output circuit 4 and an MCU 5; the coupling network 2, the two-way inverter 3, the voltage division output circuit 4 and the MCU5 are sequentially connected to form a resonant water depth sensor module;
the resonance water level sensor 1 is an LC parallel resonance circuit and comprises an inductance adjustable inductance coil and two capacitors connected in series, wherein the inductance of the inductance coil changes along with the change of water depth, so that the output frequency of the LC parallel resonance circuit changes, and the resonance water level sensor 1 is provided with A, B, C three output ends;
the coupling network 2 comprises three resistors R1, R2 and R3 which are connected in series, one ends of R1 and R2 are respectively connected with a A, B end of the resonant water level sensor 1, and the common connection ends of R1, R2 and R3 output;
the two-way inverter 3 comprises an inverter A and an inverter B; wherein the input terminal of the inverter A is connected to the common connection terminal of R1 and R3, and the output terminal of the inverter A is connected to the common connection terminal of R2 and R3;
the input end of the inverter B is connected with the input end of the inverter A, and the output end of the inverter B outputs the shaped rectangular wave signal;
the voltage division output circuit 4 comprises two series-connected resistors R6 and R7, one end of the resistor R6 is connected with the output end of the inverter B, one end of the resistor R7 is grounded, and the common connecting end of the resistor R6 and the resistor R7 outputs a divided rectangular wave signal; the resistor R7 is connected with a filter capacitor C3 in parallel;
the MCU5 comprises a timer external clock input end T0, a serial port output end TXD and a serial port input end RXD; the external clock input end T0 of the timer is connected with the common connection end of R6 and R7;
comprises a three-pin connector 6 and a four-pin connector 7; the resonance water level sensor 1 is connected with the coupling network 2 through a three-pin connector 6; the four-pin connector 7 comprises a power pin VCC, a ground pin GND, a serial port output pin TXD and a serial port receiving pin RXD, and is respectively connected with a power supply, a ground and a serial port output end TXD and a serial port input end RXD of the MCU5 of the resonant water depth sensor module;
the power supply indicating circuit 8 comprises a current limiting resistor R9, a light emitting diode D1 and a filter capacitor C5 which are connected in series; and the power supply indicating circuit 8 is connected in series between a power supply VCC of the resonant water depth sensor module and the ground GND.
The part of the utility model not detailed is prior art.
Claims (6)
1. A resonant water depth sensor module is matched with an external resonant water level sensor (1) and used for accurately measuring the depth of liquid; the method is characterized in that: the circuit comprises a coupling network (2), a two-way inverter (3), a voltage division output circuit (4) and an MCU (5); the coupling network (2), the two-way phase inverter (3), the voltage division output circuit (4) and the MCU (5) are sequentially connected to form the resonant water depth sensor module.
2. The resonant water depth sensor module of claim 1, wherein: the resonant water level sensor (1) is provided with A, B, C three output ends; wherein the output end C of the resonant water level sensor (1) is grounded;
the coupling network (2) comprises three resistors R1, R2 and R3 which are connected in series, one ends of R1 and R2 are respectively connected with a A, B end of the resonant water level sensor (1), and a common connecting end of R1, R2 and R3 is connected with the double-path inverter (3);
the double-path phase inverter (3) comprises an inverter A and an inverter B; wherein the input terminal of the inverter A is connected to the common connection terminal of R1 and R3, and the output terminal of the inverter A is connected to the common connection terminal of R2 and R3;
the input end of the reverser B is connected with the input end of the reverser A, and the output end of the reverser B outputs the shaped rectangular wave signal which is connected with the MCU (5) through the voltage division output circuit (4).
3. The resonant water depth sensor module of claim 2, wherein: the voltage division output circuit (4) comprises two series-connected resistors R6 and R7, one end of a resistor R6 is connected with the output end of the reverser B, one end of a resistor R7 is grounded, and the common connecting end of the resistor R6 and the common connecting end of the resistor R7 are connected with the MCU (5); the resistor R7 is connected in parallel with a filter capacitor C3.
4. The resonant water depth sensor module of claim 3, wherein: the MCU (5) comprises a timer external clock input end T0, a serial port output end TXD and a serial port input end RXD; the timer external clock input terminal T0 is connected to the common connection of R6, R7.
5. The resonant water depth sensor module of claim 4, wherein: comprises a three-pin connector (6) and a four-pin connector (7); the resonance water level sensor (1) is connected with the coupling network (2) through a three-pin connector (6); the four-pin connector (7) comprises a power pin VCC, a ground pin GND, a serial port output pin TXD and a serial port receiving pin RXD, and is respectively connected with a power supply, a ground of the resonant water depth sensor module, and a serial port output end TXD and a serial port input end RXD of the MCU (5).
6. The resonant water depth sensor module of claim 4, wherein: the power supply indicating circuit (8) comprises a current limiting resistor R9, a light emitting diode D1 and a filter capacitor C5 which are connected in series; and the power supply indicating circuit (8) is connected between a power supply VCC of the resonant water depth sensor module and the ground GND in series.
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| CN202120680683.5U CN214893547U (en) | 2021-04-02 | 2021-04-02 | Resonant water depth sensor module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200670A (en) * | 2022-07-19 | 2022-10-18 | 北京奕润通科技有限公司 | Liquid level sensor for vehicle and liquid level detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200670A (en) * | 2022-07-19 | 2022-10-18 | 北京奕润通科技有限公司 | Liquid level sensor for vehicle and liquid level detection method |
| CN115200670B (en) * | 2022-07-19 | 2023-11-21 | 北京奕润通科技有限公司 | Liquid level sensor for vehicle and liquid level detection method |
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