Fine seeding seed sensor based on dust compensation

Abstract

The invention discloses and provides a fine-seeding seed sensor based on dust compensation, which is used for detecting the number of seeds falling from a guide pipe of a vehicle, and comprises an infrared receiving circuit, an infrared transmitting circuit and a signal processing circuit, the infrared receiving circuit receives first light rays emitted by the seed shielding infrared emission circuit and converts the first light rays into first current, the infrared emission circuit converts the first current into first voltage and adjusts second light rays, and the infrared receiving circuit receives the shielded second light rays and converts the second light rays into second current and then converts the second current into second voltage; and the signal processing circuit converts the second voltage into a third voltage and compares the third voltage with a preset reference voltage, and if the third voltage is greater than the reference voltage, a first pulse signal corresponding to the seed is output to the vehicle acquisition module for counting. By adopting the technical scheme provided by the invention, the problem that the counting accuracy is reduced due to too weak received light intensity caused by too much dust can be prevented.

Description

Technical Field

[0001] The invention relates to the field of agricultural machinery, and in particular to a precision seeding sensor based on dust compensation. Background Art

[0002] In the process of sustainable development of modern agricultural planting, precision operation and precision agriculture are increasingly valued. When the precision seeder is performing sowing operations, precision seed sensors are used to count and count. Existing precision seed sensors mainly include percussion sensors and photoelectric seed sensors. Percussion sensors use the impact of seeds when they fall to achieve sensing and counting; photoelectric seed sensors sense and count based on the light blocking by seeds.

[0003] However, there are several disadvantages of the knocking sensor. In actual sowing operations, the seeds may not touch the seed guide tube when they fall, and thus cannot be detected. In addition, the same seed may collide back and forth in the seed guide tube multiple times. These factors make it difficult to achieve accurate counting. For photoelectric seed sensors, if there is a lot of dust during sowing operations, the accuracy of seed counting will be greatly reduced. Summary of the invention

[0004] In view of this, the purpose of this application is to provide a precision seeding sensor based on dust compensation. By adopting the technical solution provided by this application, the received light intensity can be maintained at a stable level by increasing the light-emitting current in a dusty working environment. It can not only prevent the problem of too weak received light intensity due to excessive dust, which in turn causes a decrease in counting accuracy, but also help users to control the state of the seeder in real time, so as to deal with abnormal seeding in a timely manner.

[0005] The embodiment of the present application provides a precision seeding sensor based on dust compensation, which is used to detect the number of seeds dropped from a duct of a vehicle, and the precision seeding sensor includes: an infrared receiving circuit, an infrared transmitting circuit and a signal processing circuit;

[0006] The infrared receiving circuit is electrically connected to the infrared transmitting circuit and the signal processing circuit respectively;

[0007] The infrared receiving circuit receives the first light emitted by the infrared transmitting circuit after being blocked by the seeds, and converts the first light blocked by the seeds into a corresponding first current;

[0008] The infrared emission circuit converts the first current into a first voltage, and adjusts the first light into a second light based on the first voltage;

[0009] The infrared receiving circuit receives the second light emitted by the infrared transmitting circuit after being blocked by the seeds, converts the second light blocked by the seeds into a corresponding second current; and converts the second current into a second voltage;

[0010] The signal processing circuit converts the second voltage into a third voltage, and the third voltage is compared with a preset reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the vehicle's acquisition module so that the acquisition module counts the seeds.

[0011] Optionally, the infrared receiving circuit includes: a photodiode module, a first GND and a first resistor;

[0012] The anode of the photodiode is electrically connected to the first GND, and the cathode of the photodiode is electrically connected to one end of the first resistor;

[0013] The photodiode receives the first light emitted by the infrared emission circuit after being blocked by the seeds, and converts the first light blocked by the seeds into a corresponding first current.

[0014] Optionally, the infrared transmitting circuit includes: a transmitting current driving circuit, a power supply voltage stabilizing module circuit and an infrared transmitting lamp module circuit;

[0015] The emission current driving circuit is electrically connected to the infrared receiving circuit and the power supply voltage stabilizing module circuit respectively, and the power supply voltage stabilizing module circuit is electrically connected to the infrared emission lamp module circuit;

[0016] The emission current driving circuit converts the first current into a fourth voltage, and amplifies the fourth voltage into a fifth voltage according to a first preset amplification factor;

[0017] The power supply voltage stabilizing module circuit converts the fifth voltage into the first voltage;

[0018] The infrared emission lamp module circuit adjusts the first light into a second light based on the first voltage;

[0019] The photodiode receiving circuit receives the second light emitted by the infrared transmitting circuit after being blocked by the seeds, and converts the second light blocked by the seeds into a corresponding second current;

[0020] The first resistor converts the second current into a second voltage.

[0021] Optionally, the emission current driving circuit includes: a second resistor, a first VCC, a first voltage stabilizing diode, a first operational amplifier, a second GND, a third resistor and a fourth resistor;

[0022] One end of the second resistor is electrically connected to the first VCC, the other end of the second resistor is electrically connected to the cathode of the first voltage regulator diode and the non-inverting input terminal of the first operational amplifier, the cathode of the first voltage regulator diode is electrically connected to the non-inverting input terminal of the first operational amplifier, the anode of the first voltage regulator diode is electrically connected to the second GND, one end of the third resistor is electrically connected to one end of the fourth resistor and the inverting input terminal of the first operational amplifier, one end of the fourth resistor is electrically connected to the inverting input terminal of the first operational amplifier, and the other end of the fourth resistor is electrically connected to the cathode of the photodiode and one end of the first resistor.

[0023] Optionally, the power supply voltage stabilization module circuit includes: a fifth resistor, a first transistor and a third GND;

[0024] One end of the fifth resistor is electrically connected to the emitter of the first transistor and the other end of the third resistor respectively, the other end of the fifth resistor is electrically connected to the third GND, and the base of the first transistor is electrically connected to the output end of the first operational amplifier.

[0025] Optionally, the infrared emission lamp module circuit includes: a first light emitting diode, a second light emitting diode, a third VCC and a third light emitting diode;

[0026] The anodes of the first light emitting diode, the second light emitting diode and the third light emitting diode are electrically connected to the third VCC, and the cathode of the second light emitting diode is electrically connected to the collector of the second transistor.

[0027] Optionally, the signal processing circuit includes: a voltage follower circuit, a signal amplification circuit and a comparator circuit;

[0028] The voltage follower circuit is electrically connected to the infrared emitting circuit and the signal amplifying circuit respectively, and the signal amplifying circuit is connected to the comparator circuit;

[0029] The voltage follower circuit converts the second voltage into a sixth voltage;

[0030] The signal amplifying circuit amplifies the sixth voltage into a third voltage according to a second preset amplification factor;

[0031] The comparator circuit compares the third voltage with the set reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the vehicle's acquisition module so that the acquisition module counts the seeds. If the third voltage is less than the set reference voltage, the second pulse signal in the comparator circuit is output to the vehicle's acquisition module so that the acquisition module does not count the seeds.

[0032] Optionally, the voltage follower circuit includes: a sixth resistor, a voltage follower, a seventh resistor, an eighth resistor and a ninth resistor;

[0033] The other end of the first resistor is electrically connected to one end of the sixth resistor and the non-inverting input end of the voltage follower, one end of the sixth resistor is electrically connected to the non-inverting input end of the voltage follower, the other end of the sixth resistor is electrically connected to one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is electrically connected to GND, one end of the eighth resistor is electrically connected to one end of the seventh resistor, the other end of the eighth resistor is electrically connected to one end of the ninth resistor, the other end of the ninth resistor is electrically connected to VCC, and the inverting input end of the voltage follower is electrically connected to the output end of the voltage follower.

[0034] Optionally, the signal amplifying circuit includes: a tenth resistor, an eleventh resistor, a twelfth resistor, a second voltage stabilizing diode, a third voltage stabilizing diode and a second operational amplifier;

[0035] One end of the tenth resistor is connected to the output end of the voltage follower, and the other end of the tenth resistor is respectively electrically connected to the anode of the second voltage follower, the cathode of the third voltage follower and one end of the eleventh resistor, the anode of the second voltage follower is electrically connected to the cathode of the third voltage follower, and the cathode of the second voltage follower is connected to the anode of the third voltage follower, the other end of the eleventh resistor is respectively electrically connected to the non-inverting input end of the second operational amplifier and one end of the twelfth resistor, the twelfth resistor is respectively electrically connected to the cathode of the second voltage follower, the anode of the third voltage follower and the output end of the second operational amplifier, and the inverting input end of the second operational amplifier is respectively electrically connected to the other end of the sixth resistor and one end of the seventh resistor.

[0036] Optionally, the comparator circuit includes: a thirteenth resistor, a fourteenth resistor, a voltage comparator, a fifteenth resistor, a second transistor, a fifth GND, a sixteenth resistor and a third VCC;

[0037] One end of the thirteenth resistor is electrically connected to the output end of the second operational amplifier, the other end of the thirteenth resistor is electrically connected to one end of the fourteenth resistor and the non-inverting input end of the voltage comparator, the other end of the fourteenth resistor is electrically connected to the output end of the voltage comparator and one end of the fifteenth resistor, the inverting input end of the voltage comparator is electrically connected to the other end of the eighth resistor and one end of the ninth resistor, the output end of the voltage comparator is electrically connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is electrically connected to the base of the second transistor, the emitter of the second transistor is electrically connected to the fifth GND, the collector of the second transistor is electrically connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is electrically connected to the third VCC.

[0038] The embodiment of the present application provides a precision seeding sensor based on dust compensation, wherein the infrared receiving circuit receives the first light emitted by the infrared transmitting circuit blocked by the seed and converts it into a first current, the infrared transmitting circuit converts the first current into a first voltage and adjusts the second light, the infrared receiving circuit receives the blocked second light and converts it into a second current and then into a second voltage, the signal processing circuit converts the second voltage into a third voltage and compares it with a preset reference voltage, and if the third voltage is greater than the reference voltage, the first pulse signal corresponding to the seed is output to the vehicle acquisition module for counting. In this way, by adopting the technical solution provided by the present application, the received light intensity can be maintained at a stable level by increasing the light-emitting current in a dusty working environment. It can not only prevent the problem of too weak received light intensity due to too much dust, thereby reducing the counting accuracy, but also help the user to control the state of the seeder in real time, so as to deal with abnormal seed dropping in time.

[0039] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 One of the structural schematic diagrams of a precision seeding sensor based on dust compensation provided in an embodiment of the present application is shown;

[0042] Figure 2 An exploded diagram of the structure of a precision seeding sensor based on dust compensation provided in an embodiment of the present application is shown;

[0043] Figure 3 A circuit diagram of a precision seeding sensor based on dust compensation provided by an embodiment of the present application is shown;

[0044] Figure 4 A second structural schematic diagram of a precision seeding sensor based on dust compensation provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0046] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0047] The precision seeding sensor described below in the embodiment of the present application can be applied to any scenario requiring seed counting. The embodiment of the present application is not limited to specific application scenarios. Any solution using a precision seeding sensor based on dust compensation provided in the embodiment of the present application is within the protection scope of the present application.

[0048] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0049] In the process of sustainable development of modern agricultural planting, precision operation and precision agriculture are increasingly valued. When the precision seeder performs sowing operations, precision seed sensors are used to count and count. Existing precision seed sensors mainly include percussion sensors and photoelectric seed sensors. The percussion sensor uses the impact of seeds when they fall to achieve sensing and counting; the photoelectric seed sensor senses and counts based on the shielding of light by seeds. However, the percussion sensor has several disadvantages. In actual sowing operations, the seeds may not touch the seed guide tube when they fall, and thus cannot be detected, and the same seed may collide back and forth in the seed guide tube multiple times. These factors make it difficult to achieve the purpose of accurate counting. For the photoelectric seed sensor, if there is a lot of dust during the sowing operation, the accuracy of seed counting will be greatly reduced. Based on this, the embodiment of the present application provides a precision seed sensor based on dust compensation, which can not only prevent the problem of too weak received light intensity due to a lot of dust, thereby reducing the counting accuracy, but also help users to control the state of the seeder in real time, so as to deal with abnormal seeding in time.

[0050] To facilitate the understanding of the present application, the technical solution provided by the present application is described in detail below in conjunction with specific embodiments.

[0051] See also Figure 1 , Figure 1 This is one of the structural schematic diagrams of a precision seeding sensor based on dust compensation provided in an embodiment of the present application.

[0052] In the embodiment of the present application, the seeds may include but are not limited to: corn, soybeans and sorghum.

[0053] like Figure 1As shown in , the precision seeding sensor based on dust compensation is used to detect the number of seeds dropped from the duct seeding of the vehicle, and the precision seeding sensor includes: an infrared receiving circuit 10, an infrared transmitting circuit 20 and an infrared receiving circuit 10. Among them, the infrared receiving circuit 10 is electrically connected to the infrared transmitting circuit 20 and the infrared receiving circuit 10 respectively. Here, the infrared receiving circuit 10 receives the first light emitted by the infrared transmitting circuit 20 after being blocked by the seed, and converts the first light blocked by the seed into a corresponding first current; the infrared transmitting circuit 20 converts the first current into a first voltage, and adjusts the first light into a second light based on the first voltage; the infrared receiving circuit 10 receives the second light emitted by the infrared transmitting circuit 20 after being blocked by the seed, and converts the second light blocked by the seed into a corresponding second current; the second current is converted into a second voltage; the signal processing circuit 30 converts the second voltage into a third voltage, and the third voltage is compared with a preset reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the acquisition module of the vehicle, so that the acquisition module counts the seeds.

[0054] See also Figure 2 , Figure 2 An exploded diagram of the structure related to a precision seeding sensor based on dust compensation provided in an embodiment of the present application.

[0055] like Figure 2 As shown in , the structure related to the precision seeding sensor based on dust compensation includes: a receiving end 1, a transmitting end 2 and a seed guide tube 3. Here, the infrared receiving circuit 10 and the signal processing circuit 30 are arranged at the receiving end 1, and the infrared transmitting circuit 20 is arranged at the transmitting end 2.

[0056] See also Figure 3 , Figure 3 A circuit diagram of a precision seeding sensor based on dust compensation provided in an embodiment of the present application.

[0057] like Figure 3 As shown in , the infrared receiving circuit 10 includes: a photodiode D12, a first GND and a first resistor R1. The anode of the photodiode D12 is electrically connected to the first GND, and the cathode of the photodiode D12 is electrically connected to one end of the first resistor R1.

[0058] Here, the photodiode D12 receives the first light emitted by the infrared emitting circuit 20 after being blocked by the seed, and converts the first light blocked by the seed into a corresponding first current. The first resistor R1 is used to convert the current flowing through the first resistor R1 into a corresponding voltage.

[0059] See also Figure 4 , Figure 4 The second structural schematic diagram of a precision seeding sensor based on dust compensation provided in an embodiment of the present application.

[0060] like Figure 4 As shown in , the infrared transmitting circuit 20 includes: an transmitting current driving circuit 22, a power supply voltage stabilizing module circuit 23 and an infrared transmitting lamp module circuit 21. Among them, the transmitting current driving circuit 22 is electrically connected to the infrared receiving circuit 10 and the power supply voltage stabilizing module circuit 23, respectively, and the power supply voltage stabilizing module circuit 23 is electrically connected to the infrared transmitting lamp module circuit 21. Here, the transmitting current driving circuit 22 is electrically connected to the infrared receiving circuit 10 and the power supply step-down voltage stabilizing module, respectively; the power supply voltage stabilizing module circuit 23 is electrically connected to the infrared transmitting lamp module circuit 21; the transmitting current driving circuit 22 converts the first current into a fourth voltage, and amplifies the fourth voltage into a fifth voltage according to a first preset amplification factor; the power supply voltage stabilizing module circuit 23 converts the fifth voltage into the first voltage; the infrared transmitting lamp module circuit 21 adjusts the first light into the second light based on the first voltage.

[0061] In an embodiment of the present application, after the infrared emitting lamp module circuit 21 adjusts the first light to the second light based on the first voltage, the photodiode D12 receiving circuit receives the second light emitted by the infrared emitting circuit 20 after being blocked by the seed, and converts the second light blocked by the seed into a corresponding second current, and the first resistor R1 converts the second current into a second voltage.

[0062] like Figure 3 As shown in, the emission current driving circuit 22 includes: a second resistor R13, a first VCC, a first voltage stabilizing diode D13, a first operational amplifier U4, a second GND, a third resistor R16 and a fourth resistor R17. Among them, one end of the second resistor R13 is electrically connected to the first VCC, the other end of the second resistor R13 is electrically connected to the cathode of the first voltage stabilizing diode D13 and the non-inverting input terminal of the first operational amplifier U4, the cathode of the first voltage stabilizing diode D1 is electrically connected to the non-inverting input terminal of the first operational amplifier U4, the anode of the first voltage stabilizing diode D1 is electrically connected to the second GND, one end of the third resistor R16 is electrically connected to one end of the fourth resistor R17 and the inverting input terminal of the first operational amplifier U4, one end of the fourth resistor R17 is electrically connected to the inverting input terminal of the first operational amplifier U4, and the other end of the fourth resistor R17 is electrically connected to the cathode of the photodiode D12 and one end of the first resistor R1.

[0063] Here, the resistor R13 is used to limit the current passing through the first voltage stabilizing diode D13; the first voltage stabilizing diode D13 is used to provide a constant voltage v in+The fourth resistor R17 converts the first current flowing through the fourth resistor R17 into a fourth voltage V in- The fourth resistor R17 and the resistor R16 adjust the differential gain of the first operational amplifier U4. The output voltage V out The calculation formula is: V out = {V in+ -V in-}×R16 / R17.

[0064] like Figure 3 As shown in , the power supply voltage stabilizing module circuit 23 includes: a fifth resistor R15, a first transistor Q2 and a third GND. Among them. One end of the fifth resistor R15 is electrically connected to the emitter of the first transistor Q2 and the other end of the third resistor R16 respectively, the other end of the fifth resistor R15 is electrically connected to the third GND, and the base of the first transistor Q2 is electrically connected to the output end of the first operational amplifier U4.

[0065] Here, the power supply voltage stabilizing module circuit 23 is used to adapt to different input voltage ranges, and can stably provide a constant voltage power supply for the infrared emission lamp module circuit 21 .

[0066] like Figure 3 As shown in , the infrared emission lamp module circuit 21 includes: a first light emitting diode, a second light emitting diode, a third VCC and a third light emitting diode. Among them, the anode of the first light emitting diode, the anode of the second light emitting diode and the anode of the third light emitting diode are electrically connected to the third VCC, and the cathode of the second light emitting diode is electrically connected to the collector of the second triode.

[0067] Specifically, as an example, the light emitting diode D42 is three light emitting diodes connected in parallel for emitting light.

[0068] like Figure 4 As shown in , the signal processing circuit 30 includes: a voltage follower circuit 31, a signal amplifying circuit 32 and a comparator circuit 33. The voltage follower circuit 31 is electrically connected to the infrared emitting circuit 20 and the signal amplifying circuit 32 respectively, and the signal amplifying circuit 32 is connected to the comparator circuit 33.

[0069] Here, the voltage follower circuit 31 converts the second voltage into a sixth voltage; the signal amplification circuit 32 amplifies the sixth voltage into a third voltage according to a second preset amplification factor; the comparator circuit 33 compares the third voltage with the set reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the vehicle's acquisition module so that the acquisition module counts the seeds. If the third voltage is less than the set reference voltage, the second pulse signal in the comparator circuit 33 is output to the vehicle's acquisition module so that the acquisition module does not count the seeds.

[0070] like Figure 3 As shown in, the voltage follower circuit 31 includes: a sixth resistor R2, a voltage follower U1, a seventh resistor R5, a fourth GND, an eighth resistor R6 and a ninth resistor R7. Among them. The other end of the first resistor R1 is electrically connected to one end of the sixth resistor R2 and the non-inverting input end of the voltage follower U1, one end of the sixth resistor R2 is electrically connected to the non-inverting input end of the voltage follower U1, the other end of the sixth resistor R2 is electrically connected to one end of the seventh resistor R5 and one end of the eighth resistor, the other end of the seventh resistor R5 is electrically connected to the fourth GND, one end of the eighth resistor R6 is electrically connected to one end of the seventh resistor R5, the other end of the eighth resistor R6 is electrically connected to one end of the ninth resistor R7, the other end of the ninth resistor R7 is electrically connected to VCC, and the inverting input end of the voltage follower U1 is electrically connected to the output end of the voltage follower U1.

[0071] Here, the sixth resistor R2, the seventh resistor R5, the eighth resistor R6 and the ninth resistor R7 provide a stable bias voltage for the voltage follower U1. The inverting input terminal of the voltage follower U1 is connected to the output terminal of the voltage follower U1 to form a negative feedback loop, so that the output voltage stably follows the input voltage change.

[0072] like Figure 3As shown in , the signal amplification circuit 32 includes: a tenth resistor R3, an eleventh resistor R4, a twelfth resistor R8, a second voltage-stabilizing diode D1, a third voltage-stabilizing diode D2, and a second operational amplifier U2. Among them, one end of the tenth resistor R3 is connected to the output end of the voltage follower U1, the other end of the tenth resistor R3 is respectively electrically connected to the anode of the second voltage-stabilizing diode D1, the cathode of the third voltage-stabilizing diode D2, and one end of the eleventh resistor R4, the anode of the second voltage-stabilizing diode D1 is electrically connected to the cathode of the third voltage-stabilizing diode D2, the cathode D1 of the second voltage-stabilizing diode is connected to the anode of the third voltage-stabilizing diode D2, the other end of the eleventh resistor R4 is respectively electrically connected to the non-inverting input end of the second operational amplifier U2 and one end of the twelfth resistor R8, the twelfth resistor R8 is respectively electrically connected to the cathode of the second voltage-stabilizing diode D1, the anode of the third voltage-stabilizing diode D2, and the output end of the second operational amplifier U2, and the inverting input end of the second operational amplifier U2 is respectively electrically connected to the other end of the sixth resistor R2 and one end of the seventh resistor R5.

[0073] Here, the tenth resistor R3 is used for the voltage output from the output end of the voltage follower U1 to generate a down pulse through the tenth resistor R3; the eleventh resistor R4 and the twelfth resistor R8 are amplification proportional resistors; D1 and D2 are protective diodes, which protect the operational amplifier U2 to prevent excessively high or low voltage from damaging the circuit, while ensuring that the voltage before and after amplification is at a certain voltage drop; the second operational amplifier U2 amplifies the voltage by a factor A, and the calculation formula for the factor A is: A=1+R8 / R4.

[0074] like Figure 3 As shown in , the comparator circuit 33 includes: a thirteenth resistor R9, a fourteenth resistor R10, a voltage comparator U3, a sixteenth resistor R12, a second transistor Q1, a fifth GND, a sixteenth resistor R12 and a third VCC. Among them, one end of the thirteenth resistor R9 is electrically connected to the output end of the second operational amplifier U2, the other end of the thirteenth resistor R9 is electrically connected to one end of the fourteenth resistor R10 and the non-inverting input end of the voltage comparator U3, the other end of the fourteenth resistor R10 is electrically connected to the output end of the voltage comparator U3 and one end of the fifteenth resistor R11, the inverting input end of the voltage comparator U3 is electrically connected to the other end of the eighth resistor R6 and one end of the ninth resistor R7, the output end of the voltage comparator U3 is electrically connected to one end of the fifteenth resistor R11, the other end of the fifteenth resistor R11 is electrically connected to the base of the second transistor Q1, the emitter of the second transistor Q1 is electrically connected to the fifth GND, the collector of the second transistor Q1 is electrically connected to one end of the sixteenth resistor R12, and the other end of the sixteenth resistor R12 is electrically connected to the third VCC.

[0075] Here, the thirteenth resistor R9 provides an appropriate voltage for the voltage comparator U3; the fourteenth resistor R10 provides a high impedance input to ensure that the input end of the voltage comparator U3 only processes voltage; the sixteenth resistor R12 can limit the current passing through the base of the second transistor Q1 to prevent excessive current from damaging the second transistor Q1; the sixteenth resistor R12 is a pull-up resistor, and the pull-up resistor enables the output signal to output a high level state when there is no external circuit driving.

[0076] The following is a specific example to illustrate the precision seeding sensor based on dust compensation:

[0077] like Figure 3 As shown in, when no seeds fall in the seed guide tube, first, the photodiode D12 receives the light emitted by the light-emitting diode D42, and the photodiode D12 converts the light into current, and the current is converted into a voltage signal after passing through the first resistor R1, and then output to one end of the tenth resistor R3 through the voltage follower U1. Then, the second operational amplifier U2 amplifies the voltage at the other end of the tenth resistor R3 and outputs it to one end of the thirteenth resistor R9, and the voltage comparator U3 compares the voltage at the other end of the thirteenth resistor R9 with the voltage at one end of the ninth resistor R7. Finally, when no seeds fall in the seed guide tube, the voltage at the other end of the thirteenth resistor R9 is higher. At this time, the output end of the voltage comparator U3 outputs a high level, and the fifteenth resistor R11 also outputs a high level, thereby turning on the second transistor Q1 and outputting a low-level signal to the vehicle's acquisition module. When the vehicle counts seeds, if the environment is dusty, first, the input voltage V at the input end of the first operational amplifier U4 is in- After the first operational amplifier U4 is applied, the output voltage V out Then, due to the output voltage V out The increase increases the voltage across the fifth resistor R15, and the current flowing through the fifth resistor R15 also increases, thereby increasing the current passing through the light emitting diode and enhancing the luminous intensity, thereby offsetting the problem of weakening the received light due to dust, and thus making the emitted light intensity and the received light intensity in a dynamic equilibrium state. When seeds fall in the seed guide tube, first, the seeds will block the light emitted by the light emitting diode D42, and the photodiode D12 receives the blocked light. At this time, the voltage signal of the first resistor R1 is basically 0, which causes the voltage at the other end of the thirteenth resistor R9 to be lower than the voltage at one end of the ninth resistor R7. Then, because the output end of the voltage comparator U3 outputs a low level, causing the fifteenth resistor R11 to output a low level, the second transistor Q1 cannot be turned on, and the high level is output to the vehicle's acquisition module through the pull-up resistor sixteenth resistor R12, thereby realizing the counting of seeds.

[0078] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0079] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0080] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0081] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A dust compensation based precision seeding sensor for detecting the number of seeds dropped from a duct of a vehicle, characterized in that: The precision seeding sensor comprises: an infrared receiving circuit, an infrared transmitting circuit and a signal processing circuit; The infrared receiving circuit is electrically connected to the infrared transmitting circuit and the signal processing circuit respectively; The infrared receiving circuit receives the first light emitted by the infrared transmitting circuit after being blocked by the seeds, and converts the first light blocked by the seeds into a corresponding first current; The infrared emission circuit converts the first current into a first voltage, and adjusts the first light into a second light based on the first voltage; The infrared receiving circuit receives the second light emitted by the infrared transmitting circuit after being blocked by the seeds, converts the second light blocked by the seeds into a corresponding second current; and converts the second current into a second voltage; The signal processing circuit converts the second voltage into a third voltage, and the third voltage is compared with a preset reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the vehicle's acquisition module so that the acquisition module counts the seeds.

2. The precision seeding sensor according to claim 1, characterized in that: The infrared receiving circuit comprises: a photodiode module, a first GND and a first resistor; The anode of the photodiode is electrically connected to the first GND, and the cathode of the photodiode is electrically connected to one end of the first resistor; The photodiode receives the first light emitted by the infrared emission circuit after being blocked by the seeds, and converts the first light blocked by the seeds into a corresponding first current.

3. The precision seeding sensor according to claim 2, characterized in that: The infrared emission circuit comprises: an emission current driving circuit, a power supply voltage stabilizing module circuit and an infrared emission lamp module circuit; The emission current driving circuit is electrically connected to the infrared receiving circuit and the power supply voltage stabilizing module circuit respectively, and the power supply voltage stabilizing module circuit is electrically connected to the infrared emission lamp module circuit; The emission current driving circuit converts the first current into a fourth voltage, and amplifies the fourth voltage into a fifth voltage according to a first preset amplification factor; The power supply voltage stabilizing module circuit converts the fifth voltage into the first voltage; The infrared emission lamp module circuit adjusts the first light into a second light based on the first voltage; The photodiode receiving circuit receives the second light emitted by the infrared transmitting circuit after being blocked by the seeds, and converts the second light blocked by the seeds into a corresponding second current; The first resistor converts the second current into a second voltage.

4. The precision seeding sensor according to claim 3, characterized in that: The emission current driving circuit includes: a second resistor, a first VCC, a first voltage stabilizing diode, a first operational amplifier, a second GND, a third resistor and a fourth resistor; One end of the second resistor is electrically connected to the first VCC, the other end of the second resistor is electrically connected to the cathode of the first voltage regulator diode and the non-inverting input terminal of the first operational amplifier, the cathode of the first voltage regulator diode is electrically connected to the non-inverting input terminal of the first operational amplifier, the anode of the first voltage regulator diode is electrically connected to the second GND, one end of the third resistor is electrically connected to one end of the fourth resistor and the inverting input terminal of the first operational amplifier, one end of the fourth resistor is electrically connected to the inverting input terminal of the first operational amplifier, and the other end of the fourth resistor is electrically connected to the cathode of the photodiode and one end of the first resistor.

5. The precision seeding sensor according to claim 4, characterized in that: The power supply voltage stabilization module circuit comprises: a fifth resistor, a first transistor and a third GND; One end of the fifth resistor is electrically connected to the emitter of the first transistor and the other end of the third resistor respectively, the other end of the fifth resistor is electrically connected to the third GND, and the base of the first transistor is electrically connected to the output end of the first operational amplifier.

6. The precision seeding sensor according to claim 5, characterized in that: The infrared emission lamp module circuit includes: a first light emitting diode, a second light emitting diode, a third VCC and a third light emitting diode; The anodes of the first light emitting diode, the second light emitting diode and the third light emitting diode are electrically connected to the third VCC respectively, and the cathode of the second light emitting diode is electrically connected to the collector of the second transistor.

7. The precision seeding sensor according to claim 3, characterized in that: The signal processing circuit includes: a voltage follower circuit, a signal amplification circuit and a comparator circuit; The voltage follower circuit is electrically connected to the infrared emitting circuit and the signal amplifying circuit respectively, and the signal amplifying circuit is connected to the comparator circuit; The voltage follower circuit converts the second voltage into a sixth voltage; The signal amplifying circuit amplifies the sixth voltage into a third voltage according to a second preset amplification factor; The comparator circuit compares the third voltage with the set reference voltage. If the third voltage is greater than the set reference voltage, the first pulse signal corresponding to each seed is output to the vehicle's acquisition module so that the acquisition module counts the seeds. If the third voltage is less than the set reference voltage, the second pulse signal in the comparator circuit is output to the vehicle's acquisition module so that the acquisition module does not count the seeds.

8. The precision seeding sensor according to claim 7, characterized in that: The voltage follower circuit comprises: a sixth resistor, a voltage follower, a seventh resistor, an eighth resistor and a ninth resistor; The other end of the first resistor is electrically connected to one end of the sixth resistor and the non-inverting input end of the voltage follower, one end of the sixth resistor is electrically connected to the non-inverting input end of the voltage follower, the other end of the sixth resistor is electrically connected to one end of the seventh resistor and one end of the eighth resistor, the other end of the seventh resistor is electrically connected to GND, one end of the eighth resistor is electrically connected to one end of the seventh resistor, the other end of the eighth resistor is electrically connected to one end of the ninth resistor, the other end of the ninth resistor is electrically connected to VCC, and the inverting input end of the voltage follower is electrically connected to the output end of the voltage follower.

9. The precision seeding sensor according to claim 8, characterized in that: The signal amplifying circuit comprises: a tenth resistor, an eleventh resistor, a twelfth resistor, a second voltage stabilizing diode, a third voltage stabilizing diode and a second operational amplifier; One end of the tenth resistor is connected to the output end of the voltage follower, and the other end of the tenth resistor is respectively electrically connected to the anode of the second voltage follower, the cathode of the third voltage follower and one end of the eleventh resistor, the anode of the second voltage follower is electrically connected to the cathode of the third voltage follower, and the cathode of the second voltage follower is connected to the anode of the third voltage follower, the other end of the eleventh resistor is respectively electrically connected to the non-inverting input end of the second operational amplifier and one end of the twelfth resistor, the twelfth resistor is respectively electrically connected to the cathode of the second voltage follower, the anode of the third voltage follower and the output end of the second operational amplifier, and the inverting input end of the second operational amplifier is respectively electrically connected to the other end of the sixth resistor and one end of the seventh resistor.

10. The precision seeding sensor according to claim 9, characterized in that: The comparator circuit includes: a thirteenth resistor, a fourteenth resistor, a voltage comparator, a fifteenth resistor, a second transistor, a fifth GND, a sixteenth resistor and a third VCC; One end of the thirteenth resistor is electrically connected to the output end of the second operational amplifier, the other end of the thirteenth resistor is electrically connected to one end of the fourteenth resistor and the non-inverting input end of the voltage comparator, the other end of the fourteenth resistor is electrically connected to the output end of the voltage comparator and one end of the fifteenth resistor, the inverting input end of the voltage comparator is electrically connected to the other end of the eighth resistor and one end of the ninth resistor, the output end of the voltage comparator is electrically connected to one end of the fifteenth resistor, the other end of the fifteenth resistor is electrically connected to the base of the second transistor, the emitter of the second transistor is electrically connected to the fifth GND, the collector of the second transistor is electrically connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is electrically connected to the third VCC.

Images