CN221078529U - Analog circuit for measuring soil EC - Google Patents
Analog circuit for measuring soil EC Download PDFInfo
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- CN221078529U CN221078529U CN202323155593.2U CN202323155593U CN221078529U CN 221078529 U CN221078529 U CN 221078529U CN 202323155593 U CN202323155593 U CN 202323155593U CN 221078529 U CN221078529 U CN 221078529U
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- 239000002689 soil Substances 0.000 title claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses an analog circuit for measuring soil EC, which relates to the technical field of EC measurement. The device comprises an EC measuring circuit, a voltage clamping circuit and a signal output circuit, wherein the EC measuring circuit, the voltage clamping circuit and the signal output circuit are sequentially connected; the EC measuring circuit consists of a first resistor, a second resistor and a bridge circuit, the voltage clamping circuit consists of a capacitor and a voltage stabilizing diode, the signal output circuit comprises a third resistor, PWM input signals are connected into a front end contact of the bridge circuit through the first resistor, a rear end contact of the bridge circuit is connected with the second resistor to the ground, the rear end contact of the bridge circuit is also connected with one end of the capacitor, the other end of the capacitor is reversely connected with the voltage stabilizing diode to the ground, and a node between the capacitor and the voltage stabilizing diode is connected with the third resistor to the output end. The utility model has wide dynamic range of detection data, high equipment consistency, high measurement precision and wide application prospect.
Description
Technical Field
The utility model relates to the technical field of EC measurement, in particular to an analog circuit for measuring soil EC.
Background
The traditional soil EC measurement is based on a potential difference method and mainly comprises a power input circuit, a soil EC detection circuit, a voltage lifting circuit and an output signal acquisition circuit. The power input circuit is used for providing power supply for the EC sensor; the EC detection circuit is used for transmitting signals at the signal transmitting end, and receiving the transmitted signals of the transmitting end after the signals pass through soil at the signal receiving end; the voltage lifting circuit is used for guaranteeing that signals received by the signal receiving end of the EC detection circuit reduce distortion to the greatest extent so as to guarantee the accuracy of data; the output signal acquisition circuit is used for transmitting signals received by the signal receiving end of the EC sensing circuit to the MCU.
However, in an agricultural application environment, this circuit has the following drawbacks: the dynamic range of the detection data is small; the consistency of different devices is poor; the data fluctuation is large under the same test environment, and the measurement accuracy is general. In order to solve the above problems, it is necessary to design a new analog circuit for measuring the soil EC.
Disclosure of utility model
Aiming at the defects in the prior art, the utility model aims to provide the analog circuit for measuring the soil EC, which has the advantages of simple structure, reasonable design, wide dynamic range of detection data, high equipment consistency, high measurement precision, strong practicability and easy popularization and use.
In order to achieve the above object, the present utility model is realized by the following technical scheme: an analog circuit for measuring soil EC comprises an EC measuring circuit, a voltage clamping circuit and a signal output circuit, wherein the EC measuring circuit, the voltage clamping circuit and the signal output circuit are sequentially connected; the EC measuring circuit consists of a first resistor, a second resistor and a bridge circuit, the voltage clamping circuit consists of a capacitor and a voltage stabilizing diode, the signal output circuit comprises a third resistor, PWM input signals are connected into a front end contact of the bridge circuit through the first resistor, a rear end contact of the bridge circuit is connected with the second resistor to the ground, the rear end contact of the bridge circuit is also connected with one end of the capacitor, the other end of the capacitor is reversely connected with the voltage stabilizing diode to the ground, and a node between the capacitor and the voltage stabilizing diode is connected with the third resistor to the output end.
Preferably, the zener diode adopts a diode B0530WS.
The utility model has the beneficial effects that: the circuit has the advantages of simple design, wide dynamic range of detection data, high equipment consistency, high measurement precision, small data fluctuation under the same environment and wide application prospect.
Drawings
The utility model is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a system block diagram of the present utility model;
Fig. 2 is a circuit diagram of the present utility model.
Description of the embodiments
The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.
Referring to fig. 1-2, the present embodiment adopts the following technical scheme: an analog circuit for measuring soil EC comprises an EC measuring circuit 1, a voltage clamping circuit 2 and a signal output circuit 3, wherein the EC measuring circuit 1, the voltage clamping circuit 2 and the signal output circuit 3 are connected in sequence; the EC measuring circuit 1 consists of a first resistor R1, a second resistor R2 and a bridge circuit J6, the voltage clamping circuit 2 consists of a capacitor C1 and a voltage stabilizing diode D1, the signal output circuit 3 comprises a third resistor R3, PWM input signals are connected to the front end contact of the bridge circuit J6 through the first resistor R1, the rear end contact of the bridge circuit J6 is connected with the second resistor R2 to the ground end, the rear end contact of the bridge circuit J6 is also connected with one end of the capacitor C1, the other end of the capacitor C1 is reversely connected with the voltage stabilizing diode D1 to the ground end, and a node between the capacitor C1 and the voltage stabilizing diode D1 is connected with the third resistor R3 to the output end; the zener diode D1 adopts a diode B0530WS.
The PWM input signal of this embodiment sequentially passes through the EC measurement circuit 1, the voltage clamp circuit 2, and the signal output circuit 3, and its working principle is: the EC measuring circuit 1 measures the measured object EC by using an alternating current bridge method, the MCU inputs PWM wave pulse signals, the pulse signals are transmitted to the rear end contact of the bridge circuit J6 through a transmission medium by the front end contact of the bridge circuit J6, the voltage clamping circuit 2 clamps the negative half shaft of the EC measuring output signal to be close to 0V so as to increase the dynamic range of the output signal, and the signal output circuit 3 inputs the signal after voltage clamping into the MCU.
In the specific embodiment, the EC circuit is measured by adopting an alternating current bridge method, compared with the equipment for measuring the EC circuit by adopting the traditional potential difference method, the measuring dynamic range is wider, the equipment consistency is higher, the measuring precision is high, the data fluctuation under the same environment is small, and in addition, compared with the traditional voltage dividing circuit, the diode voltage clamping circuit adopted in the circuit is simpler in circuit design, the clamping voltage is stable, and the circuit has wide market application prospect.
The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (2)
1. The analog circuit for measuring the soil EC is characterized by comprising an EC measuring circuit (1), a voltage clamping circuit (2) and a signal output circuit (3), wherein the EC measuring circuit (1), the voltage clamping circuit (2) and the signal output circuit (3) are connected in sequence; the EC measuring circuit (1) comprises a first resistor (R1), a second resistor (R2) and a bridge circuit (J6), the voltage clamping circuit (2) comprises a capacitor (C1) and a voltage stabilizing diode (D1), the signal output circuit (3) comprises a third resistor (R3), PWM input signals are connected into a front end contact of the bridge circuit (J6) through the first resistor (R1), a rear end contact of the bridge circuit (J6) is connected with the second resistor (R2) to the ground end, a rear end contact of the bridge circuit (J6) is connected with one end of the capacitor (C1), the other end of the capacitor (C1) is reversely connected with the voltage stabilizing diode (D1) to the ground end, and a node between the capacitor (C1) and the voltage stabilizing diode (D1) is connected with the third resistor (R3) to the output end.
2. An analog circuit for measuring soil EC according to claim 1, characterized in that said zener diode (D1) is a diode B0530WS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323155593.2U CN221078529U (en) | 2023-11-22 | 2023-11-22 | Analog circuit for measuring soil EC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323155593.2U CN221078529U (en) | 2023-11-22 | 2023-11-22 | Analog circuit for measuring soil EC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221078529U true CN221078529U (en) | 2024-06-04 |
Family
ID=91250493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323155593.2U Active CN221078529U (en) | 2023-11-22 | 2023-11-22 | Analog circuit for measuring soil EC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221078529U (en) |
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2023
- 2023-11-22 CN CN202323155593.2U patent/CN221078529U/en active Active
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