Extensible high-frequency nozzle control panel for agricultural precise spraying

Abstract

The utility model discloses an extensible high-frequency spray head control panel for agricultural precise spraying, which comprises a spray head control module, the spray head control module comprises an optical coupler and an mos tube, an IN pin of the optical coupler is connected with a main control module, a GND pin of the optical coupler is grounded through a resistor R1, a VCC pin of the optical coupler is connected with a control voltage end of a power supply module, and the control voltage end of the power supply module is grounded through a resistor R2. The OUT pin of the optical coupler is connected with the source pin S of the mos tube through a resistor R2 and a light emitting diode LED1, the source pin S of the mos tube is grounded, the OUT pin of the optical coupler is connected with the grid pin C of the mos tube, a resistor R3 is connected between the source pin S of the mos tube and the grid pin C of the mos tube, the drain pin D of the mos tube is connected with an execution voltage end through a diode D1, the drain pin D of the mos tube is connected with a first power connection terminal CN1, and the first power connection terminal CN1 is connected with a second power connection terminal CN2. And the first power connection terminal CN1 is also connected with an execution voltage end. Isolation of low-pressure control signals and high-pressure spray head signals can be achieved, and a control panel is well protected.

Description

Technical Field

[0001] This utility model relates to the field of irrigation equipment technology, specifically to an expandable high-frequency sprinkler head control board for precision agricultural spraying. Background Technology

[0002] Precision agriculture is becoming a trend, with precision spraying of pesticides and fertilizers playing a crucial role. Precision spraying requires not only image recognition and artificial intelligence algorithms to identify crops, but also high-frequency nozzles and their control modules to receive signals and execute the spraying of pesticides or fertilizers. Controlling these high-frequency nozzles requires a dedicated high-frequency control board. Therefore, it is necessary to provide a scalable high-frequency nozzle control board for precision agricultural spraying to meet the evolving needs of precision agriculture. Utility Model Content

[0003] The purpose of this invention is to provide an expandable high-frequency nozzle control board for precision agricultural spraying, in order to meet the ever-evolving needs of precision operations in the agricultural field.

[0004] To achieve the above objectives, this utility model discloses an expandable high-frequency nozzle control board for precision agricultural spraying. The control board includes a nozzle control module, which includes an optocoupler and a MOSFET. The optocoupler's IN pin is connected to the main control module, its GND pin is grounded through resistor R1, its VCC pin is connected to the control voltage terminal of the power module, its OUT pin is connected to the MOSFET's source pin S through resistor R2 and LED1, the MOSFET's source pin S is grounded, the optocoupler's OUT pin is connected to the MOSFET's gate pin G, a resistor R3 is connected between the MOSFET's source pin S and gate pin G, the MOSFET's drain pin D is connected to the execution voltage terminal through diode D1, the MOSFET's drain pin D is connected to the first power terminal CN1, and the first power terminal CN1 is also connected to the execution voltage terminal.

[0005] Preferably, there are eight optocouplers and eight MOSFETs. Each group consists of four optocouplers and four MOSFETs, with each group of MOSFETs corresponding to one eight-port first power terminal CN1. The port connected to the drain pin D of the MOSFET and the port connected to the execution voltage terminal of the first power terminal CN1 are alternately arranged. The specification of the first power terminal CN1 is 3.81mm. The four optocouplers in each group are connected in parallel with the control voltage terminal of the power module, and the four MOSFETs in each group are connected in parallel with the execution voltage terminal.

[0006] Preferably, resistor R1 is 510Ω, resistor R2 is 1KΩ, and resistor R3 is 10KΩ; the color of LED1 is green; the optocoupler is LTV-247; the MOSFET is UTM6016C, with the three source pins (S) of the MOSFET connected to each other and the four drain pins (D) of the MOSFET connected to each other; the power module control voltage is 5V, and the execution voltage is 12V-24V.

[0007] Preferably, the main control module includes a main control chip. The VBAT pin of the main control chip is connected to the system voltage terminal of the power module; the PC13 pin of the main control chip is connected to the LED circuit; the PC14 pin of the main control chip is connected to the input terminal of the first crystal oscillator circuit; the PC15 pin of the main control chip is connected to the output terminal of the first crystal oscillator circuit; the OSC_IN pin of the main control chip is connected to the input terminal of the second crystal oscillator circuit; the OSC_OUT pin of the main control chip is connected to the output terminal of the second crystal oscillator circuit; the RST pin of the main control chip is connected to the reset circuit; the VSSA pin of the main control chip is grounded; the VDDA pin of the main control chip is connected to the system voltage terminal of the power module; the PA0, PA1, U2_TX, U2_RX, S1_MISO, S1_MOSI, PB0, or PB1 pins of the main control chip are connected to the IN pin of the optocoupler; and the U2_CK, S1_CK, PB12, S2_CK, S2_MISO, and S... Pins 2_MOSI, PA8, PA9, PA10, JTDI, JTDO, JNRST, PA6, PA7, PB8, and PB9 are connected to an 8x2 pin connector. A 3x2 pin connector connects the main control chip PB2 / BOOT1 pin to the main control chip BOOT1 pin. Pins PB10, PB11, PA11, PA12, and PB5 of the main control chip are connected to the communication module. Pin VSS_1 of the main control chip is grounded, and pin VDD_1 of the main control chip is connected to the system voltage terminal of the power module. Pins PA9 and PA10 of the main control chip are connected to the touch screen HMI. Pins JIMS and JTCK of the main control chip are connected to the download port SWD. Pin VSS_2 of the main control chip is grounded, and pin VDD_2 of the main control chip is connected to the system voltage terminal of the power module. Pin VSS_3 of the main control chip is grounded, and pin VDD_3 of the main control chip is connected to the system voltage terminal of the power module.

[0008] Preferably, the LED circuit includes a light-emitting diode LED2 and a resistor R4. The end of LED2 furthest from resistor R4 is connected to pin PC13 of the main control chip, and the end of resistor R4 furthest from LED2 is connected to the power module system voltage terminal. The LED2 is blue, and the resistor R4 is 510Ω. The frequency of the first crystal oscillator circuit is 32.768Hz, and the frequency of the second crystal oscillator circuit is 8MHz. The main control chip is an STM32F103C8T6, and the power module system voltage is 3.3V.

[0009] Preferably, the reset circuit includes a switch KEY1, a resistor R5, and a capacitor C1 connected in parallel with the switch KEY1, all connected in series. The end of the switch KEY1 away from the resistor R5 is grounded, and the end of the resistor R5 away from the switch KEY1 is connected to the power module system voltage terminal. The RST pin of the main control chip is connected to the end of the resistor R5 closest to the switch KEY1. The resistor R5 is 10KΩ and the capacitor C1 is 104pF.

[0010] Preferably, the communication module includes a 485 chip and a CAN chip; the RO pin of the 485 chip is connected to the PB11 pin of the main control chip, and the RO pin of the 485 chip is also connected to the power module system voltage terminal through resistor R6; the RE and DE pins of the 485 chip are connected to the PB15 pin of the main control chip; the DI pin of the 485 chip is connected to the PB10 pin of the main control chip; the VCC pin of the 485 chip is connected to the power module system voltage terminal, and the VCC pin of the 485 chip is also grounded through capacitor C2; the B and A pins of the 485 chip are connected to the second power terminal CN2; and there is a connection between the B pin and the A pin of the 485 chip. A resistor R7 is connected. Pin B of the 485 chip is also grounded through a resistor R8. Pin A of the 485 chip is also connected to the power module system voltage terminal through a resistor R9. Pin TXD of the CAN chip is connected to pin PA12 of the main control chip. Pin GND of the CAN chip is grounded. Pin VCC of the CAN chip is connected to the power module system voltage terminal. Pin VCC of the CAN chip is also grounded through a capacitor C3. Pin RXD of the CAN chip is connected to pin PA11 of the main control chip. Pins CANH and CANL of the CAN chip are connected to the second power terminal CN2. A resistor R10 is connected between pins CANH and CANL of the CAN chip.

[0011] Preferably, the 485 chip is model SP3485E, and the CAN chip is model SN65HVD230; capacitor C2 is 104pF, resistor R6 is 4.7KΩ, resistor R7 is 120Ω, resistor R8 is 360Ω, resistor R9 is 360Ω, resistor R10 is 120Ω, capacitor C2 is 104pF, and capacitor C3 is 104pF; the second terminal CN2 has a specification of 3.81mm.

[0012] Preferably, the power module includes a step-down chip and a voltage regulator chip; the FREQ pin of the step-down chip is connected to a resistor R11, and capacitors C4, C5, and C6, along with a power supply, are connected in parallel between the resistor R11 and the VIN pin of the step-down chip; capacitors C7 and C8 are connected in parallel between the resistor R11 and the SW pin of the step-down chip; a toggle switch is connected between the IN pin of the voltage regulator chip and the SW pin of the step-down chip; capacitor C9 and diode D2 are connected in parallel between the IN pin of the voltage regulator chip and the GND pin; and capacitors C10 and C11, along with a light-emitting diode LED3, are connected in parallel between the OUT pin of the voltage regulator chip and the GND pin.

[0013] Preferably, the step-down chip is model MP1854, and the voltage regulator chip is model LD1117-3.3; resistor R11 is 100KΩ, capacitor C4 is 104pF, capacitor C5 is 220μF, capacitor C6 is 104pF, capacitor C7 is 220μF, capacitor C8 is 104pF, capacitor C9 is 220μF, capacitor C10 is 220μF, and capacitor C11 is 104pF; the color of LED3 is red.

[0014] In summary, the beneficial effects of this utility model are: it can achieve isolation between low-pressure control signals and high-pressure nozzle signals, and better protect the control board. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the nozzle control module in an expandable high-frequency nozzle control board for precision agricultural spraying according to this utility model.

[0016] Figure 2 This is a schematic diagram of the main control module in an expandable high-frequency nozzle control board for precision agricultural spraying according to this utility model.

[0017] Figure 3 This is a schematic diagram of the communication module in an expandable high-frequency nozzle control board for precision agricultural spraying according to this utility model.

[0018] Figure 4 This is a schematic diagram of the power module in an expandable high-frequency nozzle control board for precision agricultural spraying, according to this utility model. Detailed Implementation

[0019] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] like Figures 1 to 4 As shown, an expandable high-frequency sprinkler control board for precision agricultural spraying includes a power module, a communication module, a main control module, and a sprinkler control module. The power module filters, reduces, and regulates the 12V to 24V input power to supply power to the various components. The communication module primarily receives external sprinkler control commands via RS485 and CAN communication and sends them to the main control module, while simultaneously sending feedback information from the main control module to the outside. Based on the externally sent sprinkler control information, the main control module parses the information into specific sprinkler control commands and processes these commands into PWM high-frequency control signals, which are then sent to the sprinkler control circuit. The sprinkler control module controls the on / off state of the MOSFETs based on the received control signals, thereby controlling the sprinkler to perform the spraying action. The sprinkler uses a high-frequency sprinkler with a maximum controllable frequency of 200Hz, which utilizes existing technology and will not be described in detail here.

[0025] like Figure 1As shown, specifically, the nozzle control module includes an optocoupler and a MOSFET. The optocoupler's IN pin is connected to the main control module, the optocoupler's GND pin is grounded through resistor R1, the optocoupler's VCC pin is connected to the power module's control voltage terminal, the optocoupler's OUT pin is connected to the MOSFET's source pin S through resistor R2 and LED1, the MOSFET's source pin S is grounded, the optocoupler's OUT pin is connected to the MOSFET's gate pin G, a resistor R3 is connected between the MOSFET's source pin S and the MOSFET's gate pin G, the MOSFET's drain pin D is connected to the execution voltage terminal through diode D1, the MOSFET's drain pin D is connected to the first power terminal CN1, and the first power terminal CN1 is also connected to the execution voltage terminal.

[0026] The system contains eight optocouplers and eight MOSFETs. Each group consists of four optocouplers and four MOSFETs, with each group of MOSFETs corresponding to one eight-port first power terminal CN1. The port connecting the first power terminal CN1 and the MOSFET drain pin D is alternately connected to the port connecting the first power terminal CN1 and the execution voltage terminal. The first power terminal CN1 has a diameter of 3.81mm. The four optocouplers in each group are connected in parallel with the power module control voltage terminal, and the four MOSFETs in each group are connected in parallel with the execution voltage terminal. Resistors R1 is 510Ω, R2 is 1KΩ, and R3 is 10KΩ. The LED1 is green. The optocoupler model is LTV-247. The MOSFET model is UTM6016C, with the three source pins (S) interconnected and the four drain pins (D) interconnected. The power module control voltage is 5V, and the execution voltage is 12V-24V.

[0027] It can achieve isolation between low-pressure control signals and high-pressure nozzle signals, providing better protection for the control board. It uses a high-power MOSFET UTM6016G, with a maximum single-channel output current of up to 3A.

[0028] like Figure 2As shown, the main control module includes a main control chip. The VBAT pin of the main control chip is connected to the system voltage terminal of the power module; the PC13 pin of the main control chip is connected to the LED circuit; the PC14 pin of the main control chip is connected to the input terminal of the first crystal oscillator circuit; the PC15 pin of the main control chip is connected to the output terminal of the first crystal oscillator circuit; the OSC_IN pin of the main control chip is connected to the input terminal of the second crystal oscillator circuit; the OSC_OUT pin of the main control chip is connected to the output terminal of the second crystal oscillator circuit; the RST pin of the main control chip is connected to the reset circuit; the VSSA pin of the main control chip is grounded; the VDDA pin of the main control chip is connected to the system voltage terminal of the power module; the PA0, PA1, U2_TX, U2_RX, S1_MISO, S1_MOSI, PB0, or PB1 pins of the main control chip are connected to the IN pin of the optocoupler; the U2_CK, S1_CK, PB12, S2_CK, S2_MISO, and S... Pins 2_MOSI, PA8, PA9, PA10, JTDI, JTDO, JNRST, PA6, PA7, PB8, and PB9 are connected to an 8x2 pin connector. A 3x2 pin connector connects the main control chip PB2 / BOOT1 pin to the main control chip BOOT1 pin. Pins PB10, PB11, PA11, PA12, and PB5 of the main control chip are connected to the communication module. Pin VSS_1 of the main control chip is grounded, and pin VDD_1 of the main control chip is connected to the system voltage terminal of the power module. Pins PA9 and PA10 of the main control chip are connected to the touch screen HMI. Pins JIMS and JTCK of the main control chip are connected to the download port SWD. Pin VSS_2 of the main control chip is grounded, and pin VDD_2 of the main control chip is connected to the system voltage terminal of the power module. Pin VSS_3 of the main control chip is grounded, and pin VDD_3 of the main control chip is connected to the system voltage terminal of the power module.

[0029] The LED circuit includes a light-emitting diode (LED2) and a resistor R4. The end of LED2 furthest from resistor R4 is connected to pin PC13 of the main control chip, and the end of resistor R4 furthest from LED2 is connected to the power module system voltage terminal. The LED2 is blue, and the resistor R4 is 510Ω. The frequency of the first crystal oscillator circuit is 32.768Hz, and the frequency of the second crystal oscillator circuit is 8MHz. The main control chip is an STM32F103C8T6, and the power module system voltage is 3.3V.

[0030] The reset circuit includes a switch KEY1 connected in series, a resistor R5, and a capacitor C1 connected in parallel with the switch KEY1. The end of the switch KEY1 furthest from the resistor R5 is grounded, and the end of the resistor R5 furthest from the switch KEY1 is connected to the power module system voltage terminal. The RST pin of the main control chip is connected to the end of the resistor R5 closest to the switch KEY1. The resistor R5 is 10KΩ and the capacitor C1 is 104pF.

[0031] The PWM high-frequency control signal is issued by the internal timer of the STM32 chip, which can control the duty cycle and frequency, thereby controlling the spraying amount.

[0032] like Figure 3 As shown, the communication module includes a 485 chip and a CAN chip. The RO pin of the 485 chip is connected to pin PB11 of the main control chip. The RO pin of the 485 chip is also connected to the power module system voltage terminal through resistor R6. The RE and DE pins of the 485 chip are connected to pin PB15 of the main control chip. The DI pin of the 485 chip is connected to pin PB10 of the main control chip. The VCC pin of the 485 chip is connected to the power module system voltage terminal. The VCC pin of the 485 chip is also grounded through capacitor C2. Pins B and A of the 485 chip are connected to the second power terminal CN2. There is a connection between pins B and A of the 485 chip. A resistor R7 is connected. Pin B of the 485 chip is also grounded through a resistor R8. Pin A of the 485 chip is also connected to the power module system voltage terminal through a resistor R9. Pin TXD of the CAN chip is connected to pin PA12 of the main control chip. Pin GND of the CAN chip is grounded. Pin VCC of the CAN chip is connected to the power module system voltage terminal. Pin VCC of the CAN chip is also grounded through a capacitor C3. Pin RXD of the CAN chip is connected to pin PA11 of the main control chip. Pins CANH and CANL of the CAN chip are connected to the second power terminal CN2. A resistor R10 is connected between pins CANH and CANL of the CAN chip.

[0033] The 485 chip is model SP3485E, and the CAN chip is model SN65HVD230; capacitor C2 is 104pF, resistor R6 is 4.7KΩ, resistor R7 is 120Ω, resistor R8 is 360Ω, resistor R9 is 360Ω, resistor R10 is 120Ω, capacitor C2 is 104pF, and capacitor C3 is 104pF; the second terminal CN2 has a specification of 3.81mm.

[0034] It enables bidirectional communication between the main control module and external devices. Both communication methods support a one-to-many master-slave configuration, allowing for unlimited expansion of the control board by setting device numbers, thus controlling more nozzles.

[0035] like Figure 4As shown, the power module includes a step-down chip and a voltage regulator chip. The FREQ pin of the step-down chip is connected to resistor R11. A parallel capacitor C4, capacitor C5, capacitor C6 and a power supply are connected between resistor R11 and the VIN pin of the step-down chip. A parallel capacitor C7 and capacitor C8 are connected between resistor R11 and the SW pin of the step-down chip. A toggle switch is connected between the IN pin of the voltage regulator chip and the SW pin of the step-down chip. A parallel capacitor C9 and diode D2 are connected between the IN pin of the voltage regulator chip and the GND pin. A parallel capacitor C10, capacitor C11 and LED3 are connected between the OUT pin of the voltage regulator chip and the GND pin.

[0036] The step-down chip is model MP1854, and the voltage regulator chip is model LD1117-3.3; resistor R11 is 100KΩ, capacitor C4 is 104pF, capacitor C5 is 220μF, capacitor C6 is 104pF, capacitor C7 is 220μF, capacitor C8 is 104pF, capacitor C9 is 220μF, capacitor C10 is 220μF, and capacitor C11 is 104pF; the color of LED3 is red.

[0037] It supports a wide voltage input of 12-24V and can achieve step-down and voltage regulation functions of 5V and 3.3V.

[0038] The software program flow of the control board can be referred to as follows:

[0039] Step 1: The first step is to initialize the peripherals, including the clock, LEDs, 485, CAN, and MOSFET control ports.

[0040] Step 2: Enter the while loop and wait for instructions. The LED will flash in a cycle to indicate the direction.

[0041] Step 3: If data is received from the 485 interface, enter the serial port receive interrupt, parse the MOSBUS protocol to control the corresponding nozzle, and update the PWM frequency and duty cycle at the same time; if data is received from the CAN interface, enter the CAN receive interrupt, parse the CAN protocol to control the corresponding nozzle, and update the PWM frequency and duty cycle at the same time, control the switching of the nozzle and its switching frequency.

[0042] Step 4: After execution is complete, enter the while loop and wait for the next instruction.

[0043] It should be noted that this software flow is for reference only. The control board may adopt, but is not limited to, this software flow. Users can develop their own software based on the hardware circuit schematic.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. An expandable high-frequency nozzle control board for precision agricultural spraying, characterized in that, The system includes an optocoupler and a MOSFET. The optocoupler's IN pin is connected to the main control module, its GND pin is grounded through resistor R1, its VCC pin is connected to the power module's control voltage terminal, its OUT pin is connected to the MOSFET's source pin S through resistor R2 and LED1, the MOSFET's source pin S is grounded, the optocoupler's OUT pin is connected to the MOSFET's gate pin G, a resistor R3 is connected between the MOSFET's source pin S and gate pin G, the MOSFET's drain pin D is connected to the execution voltage terminal through diode D1, the MOSFET's drain pin D is connected to the first power terminal CN1, and the first power terminal CN1 is also connected to the execution voltage terminal.

2. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 1, characterized in that, The number of optocouplers and MOSFETs is eight each. Four optocouplers and four MOSFETs form a group, and a group of MOSFETs corresponds to one eight-port first electrical terminal CN1. The port connected to the first power terminal CN1 and the drain pin D of the MOSFET is alternately set to connect to the first power terminal CN1 and the execution voltage terminal. The first electrical terminal CN1 has a diameter of 3.81 mm. The four optocouplers in each group are connected in parallel with the control voltage terminal of the power module, and the four MOSFETs in each group are connected in parallel with the execution voltage terminal.

3. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 1, characterized in that, Resistor R1 is 510Ω, resistor R2 is 1KΩ, and resistor R3 is 10KΩ; The color of LED1 is green; The optocoupler model is LTV-247; The MOSFET model is UTM6016C. The three source pins (S) of the MOSFET are connected to each other, and the four drain pins (D) of the MOSFET are connected to each other. The power module has a control voltage of 5V and an execution voltage of 12V-24V.

4. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 1, characterized in that, The main control module includes a main control chip. The VBAT pin of the main control chip is connected to the system voltage terminal of the power module, and the PC13 pin of the main control chip is connected to the LED circuit. The main control chip's PC14 pin is connected to the input terminal of the first crystal oscillator circuit, the main control chip's PC15 pin is connected to the output terminal of the first crystal oscillator circuit, the main control chip's OSC_IN pin is connected to the input terminal of the second crystal oscillator circuit, and the main control chip's OSC_OUT pin is connected to the output terminal of the second crystal oscillator circuit. The RST pin of the main control chip is connected to the reset circuit; The VSSA pin of the main control chip is grounded, the VDDA pin of the main control chip is connected to the system voltage terminal of the power module, the PA0, PA1, U2_TX, U2_RX, S1_MISO, S1_MOSI, PB0 or ​​PB1 pins of the main control chip are connected to the IN pin of the optocoupler, the U2_CK, S1_CK, PB12, S2_CK, S2_MISO, S2_MOSI, PA8, PA9, PA10, JTDI, JTDO, JNRST, PA6, PA7, PB8 and PB9 pins of the main control chip are connected to the 8X2 pin connector, and a 3X2 pin connector is connected between the PB2 / BOOT1 pin and the BOOT1 pin of the main control chip. Pins PB10, PB11, PA11, PA12, and PB5 of the main control chip are connected to the communication module. The main control chip's VSS_1 pin is grounded, and its VDD_1 pin is connected to the power module system voltage terminal. The main control chip's PA9 and PA10 pins are connected to the touchscreen HMI. The main control chip's JIMS and JTCK pins are connected to the download port SWD. The main control chip's VSS_2 pin is grounded, and its VDD_2 pin is connected to the power module system voltage terminal. The main control chip's VSS_3 pin is grounded, and its VDD_3 pin is connected to the power module system voltage terminal.

5. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 4, characterized in that, The LED circuit includes a light-emitting diode LED2 and a resistor R4. The end of LED2 furthest from resistor R4 is connected to pin PC13 of the main control chip, and the end of resistor R4 furthest from LED2 is connected to the power module system voltage terminal. The color of LED2 is blue, and the resistance of R4 is 510Ω. The frequency of the first crystal oscillator circuit is 32.768 Hz, and the frequency of the second crystal oscillator circuit is 8 MHz. The main control chip is an STM32F103C8T6. The power module system voltage is 3.3V.

6. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 4, characterized in that, The reset circuit includes a switch KEY1 connected in series, a resistor R5, and a capacitor C1 connected in parallel with the switch KEY1. The end of the switch KEY1 furthest from the resistor R5 is grounded, and the end of the resistor R5 furthest from the switch KEY1 is connected to the power module system voltage terminal. The RST pin of the main control chip is connected to the end of the resistor R5 closest to the switch KEY1. The resistor R5 is 10KΩ and the capacitor C1 is 104pF.

7. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 4, characterized in that, The communication module includes a 485 chip and a CAN chip; The RO pin of the 485 chip is connected to the PB11 pin of the main control chip. The RO pin of the 485 chip is also connected to the power module system voltage terminal through resistor R6. The RE and DE pins of the 485 chip are connected to the PB15 pin of the main control chip. The DI pin of the 485 chip is connected to the PB10 pin of the main control chip. The VCC pin of the 485 chip is connected to the power module system voltage terminal. The VCC pin of the 485 chip is also grounded through capacitor C2. The B and A pins of the 485 chip are connected to the second power terminal CN2. A resistor R7 is connected between the B and A pins of the 485 chip. The B pin of the 485 chip is also grounded through resistor R8. The A pin of the 485 chip is also connected to the power module system voltage terminal through resistor R9. The CAN chip's TXD pin is connected to the main control chip's PA12 pin, the CAN chip's GND pin is grounded, the CAN chip's VCC pin is connected to the power module's system voltage terminal, the CAN chip's VCC pin is also grounded through capacitor C3, the CAN chip's RXD pin is connected to the main control chip's PA11 pin, the CAN chip's CANH and CANL pins are connected to the second power terminal CN2, and a resistor R10 is connected between the CAN chip's CANH and CANL pins.

8. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 7, characterized in that, The model number of the 485 chip is SP3485E, and the model number of the CAN chip is SN65HVD230; Resistor R6 is 4.7KΩ, resistor R7 is 120Ω, resistor R8 is 360Ω, resistor R9 is 360Ω, resistor R10 is 120Ω, capacitor C2 is 104pF, and capacitor C3 is 104pF. The second electrical terminal CN2 has a diameter of 3.81mm.

9. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 1, characterized in that, The power module includes a step-down chip and a voltage regulator chip; The FREQ pin of the step-down chip is connected to resistor R11. Resistors R11 and the VIN pin of the step-down chip are connected in parallel with capacitors C4, C5, and C6 and the power supply. Resistors R11 and the SW pin of the step-down chip are connected in parallel with capacitors C7 and C8. A toggle switch is connected between the IN pin of the voltage regulator chip and the SW pin of the buck converter chip. A capacitor C9 and a diode D2 are connected in parallel between the IN pin of the voltage regulator chip and the GND pin. A capacitor C10, a capacitor C11, and a light-emitting diode LED3 are connected in parallel between the OUT pin of the voltage regulator chip and the GND pin.

10. The expandable high-frequency nozzle control board for precision agricultural spraying as described in claim 9, characterized in that, The step-down chip is model MP1854, and the voltage regulator chip is model LD1117-3.3; The resistor R11 is 100KΩ, the capacitor C4 is 104pF, the capacitor C5 is 220μF, the capacitor C6 is 104pF, the capacitor C7 is 220μF, the capacitor C8 is 104pF, the capacitor C9 is 220μF, the capacitor C10 is 220μF, and the capacitor C11 is 104pF. The color of LED3 is red.

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