CN211235840U - Soil detection equipment - Google Patents
Soil detection equipment Download PDFInfo
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- CN211235840U CN211235840U CN201921827448.5U CN201921827448U CN211235840U CN 211235840 U CN211235840 U CN 211235840U CN 201921827448 U CN201921827448 U CN 201921827448U CN 211235840 U CN211235840 U CN 211235840U
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Abstract
The utility model relates to the field of soil detection, and discloses a soil detection device, which comprises a soil humidity sensor, an analog-to-digital converter, a microprocessor, a liquid crystal display module and a power supply module, wherein the output end of the soil humidity sensor is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with the input end of the microprocessor, the input end of the liquid crystal display module is connected with the output end of the microprocessor, and the output end of the power supply module is connected with the input end of; the power supply module comprises a rectifier bridge, a first capacitor, a first resistor, a first triode, a first diode, a second resistor, a first operational amplifier, a second capacitor and a voltage output end, wherein one alternating current input end of the rectifier bridge is connected with one end of 220V alternating current, and the other alternating current input end of the rectifier bridge is connected with the other end of the 220V alternating current. Implement the utility model discloses a soil detection equipment has following beneficial effect: the safety and the reliability of the circuit are higher.
Description
Technical Field
The utility model relates to a soil testing field, in particular to soil testing equipment.
Background
Soil environment testing refers to determining the environmental quality (or the pollution degree) and the variation trend thereof by measuring representative values of factors affecting the soil environment quality. The soil detection generally refers to soil environment detection, and generally comprises technical contents of stationing sampling, sample preparation, analysis methods, result characterization, data statistics, quality evaluation and the like. The soil environment can be collected and detected by adopting the soil detection equipment. Some soil detection equipment's in the prior art power supply part is owing to lack corresponding circuit protection function, for example: the safety and reliability of the circuit are low due to the lack of the current-limiting protection function.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide the higher soil detection equipment of security and reliability of a circuit.
The utility model provides a technical scheme that its technical problem adopted is: the method comprises the steps of constructing soil detection equipment, wherein the soil detection equipment comprises a soil humidity sensor, an analog-to-digital converter, a microprocessor, a liquid crystal display module and a power supply module, wherein the output end of the soil humidity sensor is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with the input end of the microprocessor, the input end of the liquid crystal display module is connected with the output end of the microprocessor, and the output end of the power supply module is connected with the input end of the microprocessor;
the power supply module comprises a rectifier bridge, a first capacitor, a first resistor, a first triode, a first diode, a second resistor, a first operational amplifier, a second capacitor and a voltage output end, wherein one alternating current input end of the rectifier bridge is connected with one end of 220V alternating current, the other alternating current input end of the rectifier bridge is connected with the other end of the 220V alternating current, one direct current output end of the rectifier bridge is grounded, the other direct current output end of the rectifier bridge is respectively connected with the first triode, one end of the first capacitor, one end of the second resistor and the power supply end of the first operational amplifier, the other end of the first capacitor is grounded, the base electrode of the first triode is connected with one end of the first resistor, the other end of the first resistor is connected with the output end of the first operational amplifier, and the other end of the second resistor and the non-inverting input end of the first operational amplifier are both grounded, the emitting electrode of the first triode is connected with the anode of the first diode, the cathode of the first diode is respectively connected with one end of the second capacitor, the inverting input end and the voltage output end of the first operational amplifier, and the other end of the second capacitor is grounded.
In the soil detecting apparatus of the present invention, the first diode has a model of S-101T.
Soil check out test set in, power module still includes the third resistance, the one end of third resistance with the one end of first electric capacity is connected, the other end of third resistance with the collecting electrode of first triode is connected.
In the soil detecting apparatus of the present invention, the resistance of the third resistor is 18k Ω.
In the soil detection device of the present invention, the power supply module further includes a fourth resistor, one end of the fourth resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier.
In the soil detecting apparatus of the present invention, the resistance of the fourth resistor is 43k Ω.
In the soil detecting device of the present invention, the first triode is an NPN-type triode.
Implement the utility model discloses a soil detection equipment has following beneficial effect: the soil humidity sensor, the analog-to-digital converter, the microprocessor, the liquid crystal display module and the power supply module are arranged; the power module includes rectifier bridge, first electric capacity, first resistance, first triode, first diode, second resistance, first operational amplifier, second electric capacity and voltage output end, and first diode is used for carrying out the current-limiting protection, consequently the utility model discloses the security and the reliability of circuit are higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the soil detection device of the present invention;
fig. 2 is a schematic circuit diagram of the power supply module in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model discloses in the soil detection device embodiment, this soil detection device's schematic structure diagram is shown in FIG. 1. In fig. 1, the soil detection device comprises a soil humidity sensor 1, an analog-to-digital converter 2, a microprocessor 3, a liquid crystal display module 4 and a power supply module 5, wherein the output end of the soil humidity sensor 1 is connected with the input end of the analog-to-digital converter 2, the output end of the analog-to-digital converter 2 is connected with the input end of the microprocessor 3, the input end of the liquid crystal display module 4 is connected with the output end of the microprocessor 3, and the output end of the power supply module 5 is connected with the input end of the microprocessor 3.
The type that soil moisture sensor 1 adopted is FDS100, and soil moisture sensor 1 is the single channel connection. The soil humidity sensor 1 adopts a stainless steel probe to ensure the service life; the exterior is encapsulated by epoxy resin pure colloid, the sealing performance is good, and the epoxy resin pure colloid can be directly buried in soil for use. The analog-to-digital converter 2 is a circuit that converts the acquired analog quantity into a digital quantity and sends the digital quantity to the microprocessor 3. The microprocessor 3 is of the type AT89C 51.
Fig. 2 is a schematic circuit diagram of a power supply module in this embodiment, in fig. 2, the power supply module 5 includes a rectifier bridge Z, a first capacitor C1, a first resistor R1, a first transistor Q1, a first diode D1, a second resistor R2, a first operational amplifier a1, a second capacitor C2, and a voltage output Vo, wherein an ac input terminal of the rectifier bridge Z is connected to one end of the 220V ac power, another ac input terminal of the rectifier bridge Z is connected to the other end of the 220V ac power, one dc output terminal of the rectifier bridge Z is grounded, another dc output terminal of the rectifier bridge Z is connected to one end of the first transistor Q1, one end of the first capacitor C1, one end of the second resistor R2, and a power supply terminal of the first operational amplifier a1, another end of the first capacitor C1 is grounded, a base of the first transistor Q1 is connected to one end of the first resistor R1, and another end of the first resistor R1 is connected to an output terminal of the first operational amplifier a1, the other end of the second resistor R2 and the non-inverting input end of the first operational amplifier A1 are both grounded, the emitter of the first triode Q1 is connected with the anode of the first diode D1, the cathode of the first diode D1 is respectively connected with one end of the second capacitor C2, the inverting input end of the first operational amplifier A1 and the voltage output end Vo, and the other end of the second capacitor C2 is grounded.
The rectifier bridge Z is a bridge rectifier circuit formed by four diodes, and adopts a bridge rectifier circuit structure in the prior art, and adopts an operating principle which is also in the prior art, and the details are not described here.
In this embodiment, the first diode D1 is a current limiting diode, and is used for current limiting protection of the emitter current of the first transistor Q1. The current limiting protection principle is as follows: when the emitter current of the first triode Q1 is large, the first diode D1 can reduce the emitter current of the first triode Q1 to keep the first triode Q1 in a normal working state, and the elements in the circuit are not burnt out due to too large current, so that the safety and reliability of the circuit are high. It should be noted that in the present embodiment, the first diode D1 has a model number S-101T. Of course, in practical applications, the first diode D1 may also be a diode with a similar type of function.
In this embodiment, the first transistor Q1 is an NPN transistor. Of course, in practical applications, the first transistor Q1 may also be another type of diode with similar functions.
In this embodiment, the power supply module 5 further includes a third resistor R3, one end of the third resistor R3 is connected to one end of the first capacitor C1, and the other end of the third resistor R3 is connected to a collector of the first transistor Q1. The third resistor R3 is a current limiting resistor, and is used for current limiting protection of the collector current of the first transistor Q1. The current limiting protection principle is as follows: when the collector current of the first triode Q1 is large, the third resistor R3 can reduce the collector current of the first triode Q1 to keep the first triode Q1 in a normal working state, so that the device in the circuit is not burned out due to too large current, and the safety and reliability of the circuit are further enhanced. It should be noted that, in the present embodiment, the resistance of the third resistor R3 is 18k Ω. Of course, in practical applications, the resistance of the third resistor R3 may be adjusted according to specific situations, that is, the resistance of the third resistor R3 may be increased or decreased according to specific situations.
In this embodiment, the power supply module 5 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the cathode of the first diode D1, and the other end of the fourth resistor R4 is connected to the inverting input terminal of the first operational amplifier a 1. The fourth resistor R4 is a current limiting resistor for current limiting protection. The current limiting protection principle is as follows: when the current of the branch where the fourth resistor R4 is located is large, the current of the branch where the fourth resistor R4 is located can be reduced by the fourth resistor R4, so that the branch can be kept in a normal operating state, and the component in the circuit can not be burned out due to the large current, so that the safety and reliability of the circuit can be further enhanced. It should be noted that, in the present embodiment, the resistance of the fourth resistor R4 is 43k Ω. Of course, in practical applications, the resistance of the fourth resistor R4 may be adjusted according to specific situations, that is, the resistance of the fourth resistor R4 may be increased or decreased according to specific situations.
In short, in the present embodiment, since the current-limiting diode is provided in the power supply module 5, the safety and reliability of the circuit are high.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The soil detection equipment is characterized by comprising a soil humidity sensor, an analog-to-digital converter, a microprocessor, a liquid crystal display module and a power supply module, wherein the output end of the soil humidity sensor is connected with the input end of the analog-to-digital converter, the output end of the analog-to-digital converter is connected with the input end of the microprocessor, the input end of the liquid crystal display module is connected with the output end of the microprocessor, and the output end of the power supply module is connected with the input end of the microprocessor;
the power supply module comprises a rectifier bridge, a first capacitor, a first resistor, a first triode, a first diode, a second resistor, a first operational amplifier, a second capacitor and a voltage output end, wherein one alternating current input end of the rectifier bridge is connected with one end of 220V alternating current, the other alternating current input end of the rectifier bridge is connected with the other end of the 220V alternating current, one direct current output end of the rectifier bridge is grounded, the other direct current output end of the rectifier bridge is respectively connected with the first triode, one end of the first capacitor, one end of the second resistor and the power supply end of the first operational amplifier, the other end of the first capacitor is grounded, the base electrode of the first triode is connected with one end of the first resistor, the other end of the first resistor is connected with the output end of the first operational amplifier, and the other end of the second resistor and the non-inverting input end of the first operational amplifier are both grounded, the emitting electrode of the first triode is connected with the anode of the first diode, the cathode of the first diode is respectively connected with one end of the second capacitor, the inverting input end and the voltage output end of the first operational amplifier, and the other end of the second capacitor is grounded.
2. The soil sensing device of claim 1, wherein the first diode is of type S-101T.
3. The soil detection device of claim 1, wherein the power supply module further comprises a third resistor, one end of the third resistor is connected to one end of the first capacitor, and the other end of the third resistor is connected to the collector of the first triode.
4. The soil sensing device of claim 3, wherein the third resistor has a resistance of 18k Ω.
5. The soil detection device of claim 1, wherein the power supply module further comprises a fourth resistor, one end of the fourth resistor is connected to the cathode of the first diode, and the other end of the fourth resistor is connected to the inverting input terminal of the first operational amplifier.
6. The soil detection device of claim 5, wherein the fourth resistor has a resistance of 43k Ω.
7. The soil detection device of any one of claims 1 to 6, wherein the first transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921827448.5U CN211235840U (en) | 2019-10-28 | 2019-10-28 | Soil detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921827448.5U CN211235840U (en) | 2019-10-28 | 2019-10-28 | Soil detection equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211235840U true CN211235840U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921827448.5U Active CN211235840U (en) | 2019-10-28 | 2019-10-28 | Soil detection equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211235840U (en) |
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2019
- 2019-10-28 CN CN201921827448.5U patent/CN211235840U/en active Active
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