Electronic air pressure switch main control board

Abstract

The present disclosure provides an electronic wind pressure switch main control board, including a first data transmission interface, a second data transmission interface, a single chip microcomputer, a display module, a setting module, an alarm module and a photoelectric coupling module; the first data transmission interface is used to transmit the pressure signal of the pressure sensor to the single chip microcomputer; the second data transmission interface is used to transmit the concentration signal of the concentration sensor to the single chip microcomputer, and the control on-off signal of the photoelectric coupling module is transmitted to the external fan; the setting module is used to set the pressure alarm threshold and the concentration alarm threshold; the single chip microcomputer is used to process the pressure signal and the concentration signal and display the processed pressure value and concentration value on the display module, output an alarm signal when the pressure value is greater than or less than the pressure alarm threshold or the concentration value is greater than the concentration alarm threshold, and output a control on-off signal. Through the linkage action between the modules set, the external fan can be accurately turned on and off.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure sensors, and in particular relates to an electronic wind pressure switch main control board. Background Art

[0002] The wind pressure switch is a gas pressure control component that uses a single-chip microcomputer and its associated control circuit, a pressure sensor and a methane sensor to control the operating state of an external fan. When the pressure sensor detects that the gas pressure is greater than the set pressure value or the methane concentration is greater than the set concentration value within a certain space, the fan is turned on to ventilate and reduce the pressure. The wind pressure switch is mainly used for machinery that requires pressure reduction and for the detection of leaks of methane, butane, coal gas, etc., such as pneumatic presses, pneumatic shearing machines, gas water heaters, gas boilers, gas furnaces, wall-mounted boilers and other electrical products that use gas.

[0003] Therefore, how to achieve precise control of the operating status of the external fan has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provides an electronic wind pressure switch main control board.

[0005] The present disclosure provides an electronic wind pressure switch main control board, including a single-chip microcomputer and a first data transmission interface, a second data transmission interface, a display module, a setting module, an alarm module and a photoelectric coupling module respectively electrically connected to the single-chip microcomputer, wherein the first data transmission interface is also used to be electrically connected to a pressure sensor, the second data transmission interface is also used to be electrically connected to a concentration sensor, and the photoelectric coupling module is also used to be electrically connected to an external fan;

[0006] The first data transmission interface is used to transmit the pressure signal of the pressure sensor to the single chip microcomputer;

[0007] The second data transmission interface is used to transmit the concentration signal of the concentration sensor to the single-chip microcomputer, and to transmit the control on-off signal of the photoelectric coupling module to the external fan;

[0008] The setting module is used to set the pressure alarm threshold and the concentration alarm threshold;

[0009] The single chip microcomputer is used to process the pressure signal and the concentration signal and display the processed pressure value and concentration value on the display module; and

[0010] The single chip microcomputer is further used to control the alarm module to output an alarm signal and output the control on-off signal when the pressure value is greater than or less than the pressure alarm threshold or the concentration value is greater than the concentration alarm threshold.

[0011] In some implementations, the first data transmission interface uses an IIC interface;

[0012] The input end of the IIC interface is electrically connected to the output end of the pressure sensor, the first output end of the IIC interface is electrically connected to the P3.0 port of the microcontroller through the data line SDA, and the second output end of the IIC interface is electrically connected to the P1.7 port of the microcontroller through the control line SCL.

[0013] In some embodiments, the display module uses a digital tube;

[0014] The first chip select signal terminal DIG1 of the digital tube is electrically connected to the P0.4 port of the single-chip microcomputer, the second chip select signal terminal DIG2 of the digital tube is electrically connected to the P0.3 port of the single-chip microcomputer, the third chip select signal terminal DIG3 of the digital tube is electrically connected to the P0.1 port of the single-chip microcomputer, and the fourth chip select signal terminal DIG4 of the digital tube is electrically connected to the P0.0 port of the single-chip microcomputer.

[0015] In some embodiments, the setting module includes a setting key switch, an increase key switch, and a decrease key switch;

[0016] The first end of the setting button switch is electrically connected to the P1.0 port of the single-chip microcomputer, the first end of the increase button switch is electrically connected to the P1.1 port of the single-chip microcomputer, the first end of the decrease button switch is electrically connected to the P1.2 port of the single-chip microcomputer, and the second ends of the setting button switch, the increase button switch and the decrease button switch are all grounded.

[0017] In some embodiments, the pressure alarm threshold comprises a pressure alarm high pressure threshold and a pressure alarm low pressure threshold;

[0018] The alarm module includes an LED alarm circuit, and the LED alarm circuit includes a first LED light and a second LED light, and the colors of the first LED light and the second LED light are different; the first LED light is electrically connected to the P0.2 port of the single-chip microcomputer, and the second LED light is electrically connected to the P1.6 port of the single-chip microcomputer; wherein,

[0019] The single chip microcomputer is also used to control the first LED light to turn on when the pressure value exceeds the pressure alarm high pressure threshold, and control the photoelectric coupling module to electrically turn on the external fan; and to control the second LED light to turn on when the pressure value is lower than the pressure alarm low pressure threshold, and control the photoelectric coupling module to electrically turn off the external fan.

[0020] In some embodiments, the alarm module further includes a buzzer alarm circuit, which includes a voltage source, a buzzer and a transistor; the first electrode of the transistor is electrically connected to the voltage source through the buzzer, the second electrode of the transistor is grounded, and the control electrode of the transistor is electrically connected to the P0.7 port of the single-chip microcomputer; wherein,

[0021] The single chip microcomputer is also used to control the buzzer to alarm when the pressure value is lower than the pressure alarm low pressure threshold.

[0022] In some embodiments, an edge-triggered shift register circuit is also included;

[0023] The data input end of the edge-triggered shift register circuit is electrically connected to the P1.3 port of the single-chip microcomputer, the clock signal end is electrically connected to the P1.5 port of the single-chip microcomputer, and the output end of the edge-triggered shift register is electrically connected to the input end of the display module.

[0024] In some embodiments, the photoelectric coupling module includes a photoelectric coupling tube and a transient suppression diode;

[0025] The photoelectric coupling tube is electrically connected to the second data transmission interface and the external fan respectively, the anode terminal of the transient suppression diode is grounded, and the cathode of the transient suppression diode is electrically connected to the second data transmission interface.

[0026] In some embodiments, a main program download module is also included;

[0027] The first port of the main program download module is electrically connected to a voltage source, the second port of the main program download module is electrically connected to a P1.6 port of the single-chip microcomputer, the third port of the main program download module is electrically connected to a P0.2 port of the single-chip microcomputer, and the fourth port of the main program download module is grounded.

[0028] In some embodiments, a backup program download module is also included;

[0029] The first port of the standby program download module is grounded, the second port of the standby program download module is electrically connected to the P0.7 port of the single-chip microcomputer, the third port of the standby program download module is electrically connected to the P0.6 port of the single-chip microcomputer, and the fourth port of the standby program download module is electrically connected to a voltage source.

[0030] The electronic wind pressure switch main control board disclosed in the present invention reads the pressure signal in the pressure sensor through the first data transmission interface and transmits it to the single-chip microcomputer, reads the concentration signal of the concentration sensor through the second data transmission interface, obtains the pressure value and concentration value after processing by the single-chip microcomputer, and after judgment by the single-chip microcomputer, the display module displays the pressure value measured by the current pressure sensor and the concentration value measured by the concentration sensor. When the pressure value does not match the pressure alarm threshold or the concentration value does not match the concentration alarm threshold, the single-chip microcomputer controls the alarm module to output an alarm, and at the same time controls the photoelectric coupling module to turn on or off the external fan. The electronic wind pressure switch main control board of this embodiment can realize the precise opening and closing of the external fan through the linkage action between the modules set. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural schematic diagram of a main control board of an electronic wind pressure switch according to an embodiment of the present disclosure;

[0032] Figure 2 The figure is a schematic diagram of the structure of the electronic wind pressure switch main control board according to another embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] like Figure 1 and Figure 2 As shown, the embodiment of the present disclosure relates to an electronic wind pressure switch main control board 100, including a first data transmission interface 110, a single-chip computer 120, a display module 130, a setting module 140, an alarm module 150, a second data transmission interface 160 and a photoelectric coupling module 170. The first data transmission interface 110, the display module 130, the setting module 140, the alarm module 150, the second data transmission interface 160 and the photoelectric coupling module 170 are all electrically connected to the single-chip computer 120. The first data transmission interface 110 is also used to be electrically connected to a pressure sensor (not shown in the figure), and the second data transmission interface 160 is also used to be electrically connected to a concentration sensor (not shown in the figure). The photoelectric coupling module 170 is also used to be electrically connected to a fan (not shown in the figure).

[0035] like Figure 1 and Figure 2As shown, the first data transmission interface 110 is used to transmit the pressure signal of the pressure sensor to the single-chip microcomputer 120. The second data transmission interface 160 is used to transmit the concentration signal of the concentration sensor to the single-chip microcomputer 120, and transmit the control on-off signal of the photoelectric coupling module 170 to the external fan. As an example, the concentration sensor can be a methane sensor. The setting module 140 is used to set the pressure alarm threshold and the concentration alarm threshold. The single-chip microcomputer 120 is used to process the pressure signal and the concentration signal and display the processed pressure value and concentration value on the display module 130, and control the alarm module 150 to output an alarm signal when the pressure value is greater than or less than the pressure alarm threshold or the concentration value is greater than the concentration alarm threshold, and output the control on-off signal to control the photoelectric coupling module 170 to turn the external fan on or off.

[0036] The electronic wind pressure switch main control board of this embodiment reads the pressure signal in the pressure sensor through the first data transmission interface and transmits it to the single-chip microcomputer, reads the concentration signal of the concentration sensor through the second data transmission interface, obtains the pressure value and concentration value after processing by the single-chip microcomputer, and after judgment by the single-chip microcomputer, the display module displays the pressure value measured by the current pressure sensor and the concentration value measured by the concentration sensor. When the pressure value does not match the pressure alarm threshold or the concentration value does not match the concentration alarm threshold, the single-chip microcomputer controls the alarm module to output an alarm, and at the same time controls the photoelectric coupling module to turn on or off the external fan. The electronic wind pressure switch main control board of this embodiment can realize the precise opening and closing of the external fan through the linkage action between the modules set.

[0037] For example, Figure 1 and Figure 2 As shown, the first data transmission interface 110 adopts an IIC interface. The input end of the IIC interface is electrically connected to the output end of the pressure sensor, the first output end of the IIC interface is electrically connected to the P3.0 port of the single-chip microcomputer 120 through the data line SDA, and the second output end of the IIC interface is electrically connected to the P1.7 port of the single-chip microcomputer 120 through the control line SCL.

[0038] For example, Figure 1 and Figure 2 As shown, the display module 130 uses a digital tube. The first chip selection signal terminal DIG1 of the digital tube is electrically connected to the P0.4 port of the single-chip microcomputer 120, the second chip selection signal terminal DIG2 of the digital tube is electrically connected to the P0.3 port of the single-chip microcomputer 120, the third chip selection signal terminal DIG3 of the digital tube is electrically connected to the P0.1 port of the single-chip microcomputer 120, and the fourth chip selection signal terminal DIG4 of the digital tube is electrically connected to the P0.0 port of the single-chip microcomputer 120.

[0039] For example, Figure 1 and Figure 2 As shown, the setting module 140 includes a setting key switch SW1, an increase key switch SW2 and a decrease key switch SW3. The first end of the setting key switch SW1 is electrically connected to the P1.0 port of the single-chip microcomputer 120, the first end of the increase key switch SW2 is electrically connected to the P1.1 port of the single-chip microcomputer 120, the first end of the decrease key switch SW3 is electrically connected to the P1.2 port of the single-chip microcomputer, and the second ends of the setting key switch SW1, the increase key switch SW2 and the decrease key switch SW3 are all grounded.

[0040] Specifically, the setting module 140 can set the pressure alarm threshold through different buttons, set the pressure alarm high pressure threshold, the pressure alarm low pressure threshold, the number of shutdown times, the time value for automatically lowering the high and low pressure thresholds, and the methane alarm concentration level value.

[0041] In one embodiment, press the setting button switch SW1, and press it to display in sequence: the set pressure alarm high pressure threshold, the set pressure alarm low pressure threshold, the set maximum closing times, the actual closing times, the set time value for automatically reducing the high and low pressure thresholds, the cumulative working time of the fan, and the methane alarm concentration level value. When the actual closing times reach the set maximum closing times, the display module displays "CCCC". When any button switch is not pressed within 10 minutes, the display module automatically turns off and enters the power saving mode. When the increase button switch SW2 or the decrease button switch SW3 is pressed arbitrarily, the display module starts to display the current actual air pressure value collected. Press the setting button SW1 for 2 seconds and then release it, the display flashes, and enters the setting mode. Press it to display the next setting in sequence: the set pressure alarm high pressure threshold, the set pressure alarm low pressure threshold, the set maximum closing times, the set time value for automatically reducing the high and low pressure thresholds, and the set methane alarm concentration level. When setting, press the increase button switch SW2 once to increase the set value by 1, press the decrease button switch SW3 once to decrease the set value by 1, and press the increase button switch SW2 or the decrease button switch SW3 without releasing it to increase or decrease the set value rapidly. When no button switch is pressed for 2 seconds during setting, the display returns to the pressure value read from the pressure sensor.

[0042] In another embodiment, the function of the button is used (zero calibration and special function setting):

[0043] (1) Do not turn on the power first, press the setting button switch SW1 and the increase button switch SW2 at the same time and do not release them, then turn on the power and release the two buttons to enable / disable the alarm function;

[0044] (2) Do not turn on the power first, press the increase button switch SW2 and the decrease button switch SW3 at the same time and do not release them, then turn on the power and release the two buttons to calibrate the sensor pressure data to zero;

[0045] (3) Do not turn on the power first, press the setting key switch SW1 and the reduction key switch SW3 at the same time without releasing them, then turn on the power and release the two key switches to clear the stored closing times.

[0046] For example, Figure 1 and Figure 2 As shown, the alarm module 150 includes an LED alarm circuit 151 and a buzzer alarm circuit 152. The LED alarm circuit 151 includes a first LED light and a second LED light, and the colors of the first LED light and the second LED light are different. In one example, the first LED light is a green light, and the second LED light is a red light. The first LED light is electrically connected to the P0.2 port of the single-chip microcomputer, and the second LED light is electrically connected to the P1.6 port of the single-chip microcomputer. The first LED light can be a green light, and the second LED light can be a red light.

[0047] For example, Figure 1 and Figure 2 As shown, the buzzer alarm circuit 152 includes a voltage source, a buzzer BEEP and a transistor Q2, the transistor Q2 is a J3Y type, and is used to amplify the circuit. The first electrode of the transistor Q2 is electrically connected to the voltage source through the buzzer BEEP, the second electrode of the transistor Q2 is grounded, and the control electrode of the transistor Q2 is electrically connected to the P0.7 port of the single-chip computer 120.

[0048] Specifically, when the pressure value is greater than the set pressure alarm high pressure threshold, the first LED light (green light) is on, and the second LED light (red light) is off. At the same time, the single chip controls the photoelectric coupling module 170 to electrically turn on the fan to start the fan for pressure relief. When the pressure value is less than the set pressure alarm low pressure threshold, the green light is off, the red light is on, the buzzer alarms, and the single chip controls the photoelectric coupling module 170 to electrically turn off the external fan and turn off the fan. When the concentration value is greater than the set concentration alarm threshold, the buzzer alarms, and at the same time, the single chip controls the photoelectric coupling module 170 to electrically turn on the external fan to start the external fan to dilute the gas concentration. It has the advantages of simple operation and clear use; the LED alarm circuit and the buzzer alarm circuit are used in combination, and light and sound are transmitted, making it easy to understand and simple.

[0049] In addition, when the external fan is closed for a maximum number of times, the wind pressure switch will not control the fan to work, the buzzer will alarm, and the digital tube will display "CCCC"; at this time, the external fan needs to be cleared for a maximum number of times, and then the wind pressure switch can work normally.

[0050] When the accumulated working time of the external fan reaches the set time value for automatically lowering the high and low pressure thresholds, the set pressure alarm high pressure threshold and the set pressure alarm low pressure threshold are automatically lowered by 80% (the automatic lowering ratio can be adjusted through the code).

[0051] For example, Figure 1 and Figure 2 As shown, it also includes an edge-triggered shift register circuit 180, which inputs data serially and outputs data in parallel. The data input terminals DSA and DSB of the edge-triggered shift register circuit are electrically connected to the P1.3 port of the single-chip microcomputer, the clock signal terminal CP is electrically connected to the P1.5 port of the single-chip microcomputer, and the output terminals (Q0 to Q7) of the edge-triggered shift register are electrically connected to the input terminals of the digital tube. When the low level changes to the high level, the edge is triggered, and the single-chip microcomputer executes the program to control the digital tube to output and display through the edge-triggered shift register.

[0052] For example, Figure 1 and Figure 2 As shown, the photoelectric coupling module 170 includes a photoelectric coupling tube MOC3021 and a transient suppression diode D3. One end of the photoelectric coupling tube MOC3021 is electrically connected to the second data transmission interface, and the other end of the photoelectric coupling tube MOC3021 is electrically connected to the P1.4 port of the single-chip microcomputer. The anode end of the transient suppression diode D3 is grounded, and the cathode of the transient suppression diode is electrically connected to the second data transmission interface. The addition of the transient suppression diode in the photoelectric coupling module can prevent damage to the components in the electronic wind pressure differential sensor and prevent interference caused by switches between buses.

[0053] For example, Figure 1 and Figure 2As shown, it also includes a main program download module 191 and a standby program download module 192. The first port of the main program download module 191 is electrically connected to the voltage source, the second port of the main program download module 191 is electrically connected to the P1.6 port of the single-chip microcomputer, the third port of the main program download module 191 is electrically connected to the P0.2 port of the single-chip microcomputer, and the fourth port of the main program download module is grounded. The first port of the standby program download module 192 is grounded, the second port of the standby program download module 192 is electrically connected to the P0.7 port of the single-chip microcomputer, the third port of the standby program download module 192 is electrically connected to the P0.6 port of the single-chip microcomputer, and the fourth port of the standby program download module 192 is electrically connected to the voltage source. The standby program download module 192 is a USB-TTL download mode. Both program download ports can realize program download and power supply.

[0054] The electronic wind pressure switch main control board disclosed in the present invention has a 5V or 3.3V power supply option, IIC signal output, dual power supply mode, two download program mode ports, photoelectric coupling circuit detection, LED light control, buzzer alarm circuit monitoring, and digital tube pressure value output. The program is compiled in C language and supports re-editing; it is easy to install and simple to operate. The buttons have multiple functions and are highly practical; the buzzer alarm is safe and reliable.

[0055] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An electronic wind pressure switch main control board, characterized in that: It includes a single-chip microcomputer and a first data transmission interface, a second data transmission interface, a display module, a setting module, an alarm module and a photoelectric coupling module which are electrically connected to the single-chip microcomputer respectively, wherein the first data transmission interface is also used to be electrically connected to a pressure sensor, the second data transmission interface is also used to be electrically connected to a concentration sensor, and the photoelectric coupling module is also used to be electrically connected to an external fan; The first data transmission interface is used to transmit the pressure signal of the pressure sensor to the single chip microcomputer; The second data transmission interface is used to transmit the concentration signal of the concentration sensor to the single-chip microcomputer, and to transmit the control on-off signal of the photoelectric coupling module to the external fan; The setting module is used to set the pressure alarm threshold and the concentration alarm threshold; the pressure alarm threshold includes the pressure alarm high pressure threshold and the pressure alarm low pressure threshold; The single chip microcomputer is used to process the pressure signal and the concentration signal and display the processed pressure value and concentration value on the display module; and The single chip microcomputer is further used to control the alarm module to output an alarm signal and output the control on-off signal when the pressure value is greater than the pressure alarm high pressure threshold or less than the pressure alarm low pressure threshold or the concentration value is greater than the concentration alarm threshold; The photoelectric coupling module includes a photoelectric coupling tube and a transient suppression diode; The photoelectric coupling tube is electrically connected to the second data transmission interface and the external fan respectively, the anode terminal of the transient suppression diode is grounded, and the cathode of the transient suppression diode is electrically connected to the second data transmission interface; When the external fan is shut down times reaches the set maximum number of times, the electronic air pressure switch main control board will not control the external fan to work, and the alarm module will output an alarm signal. After the external fan is shut down times are reset to zero, the electronic air pressure switch main control board will work normally; and when the external fan's cumulative working time reaches the set time value for automatically lowering the high and low air pressure thresholds, the set pressure alarm high pressure threshold and the set pressure alarm low pressure threshold are automatically lowered by 80%.

2. The electronic wind pressure switch main control board according to claim 1, characterized in that: The first data transmission interface adopts an IIC interface; The input end of the IIC interface is electrically connected to the output end of the pressure sensor, the first output end of the IIC interface is electrically connected to the P3.0 port of the microcontroller through the data line SDA, and the second output end of the IIC interface is electrically connected to the P1.7 port of the microcontroller through the control line SCL.

3. The electronic wind pressure switch main control board according to claim 1, characterized in that: The display module adopts a digital tube; The first chip select signal terminal DIG1 of the digital tube is electrically connected to the P0.4 port of the single-chip microcomputer, the second chip select signal terminal DIG2 of the digital tube is electrically connected to the P0.3 port of the single-chip microcomputer, the third chip select signal terminal DIG3 of the digital tube is electrically connected to the P0.1 port of the single-chip microcomputer, and the fourth chip select signal terminal DIG4 of the digital tube is electrically connected to the P0.0 port of the single-chip microcomputer.

4. The electronic wind pressure switch main control board according to any one of claims 1 to 3, characterized in that: The setting module includes a setting key switch, an increase key switch and a decrease key switch; The first end of the setting button switch is electrically connected to the P1.0 port of the single-chip microcomputer, the first end of the increase button switch is electrically connected to the P1.1 port of the single-chip microcomputer, the first end of the decrease button switch is electrically connected to the P1.2 port of the single-chip microcomputer, and the second ends of the setting button switch, the increase button switch and the decrease button switch are all grounded.

5. The electronic wind pressure switch main control board according to any one of claims 1 to 3, characterized in that: The alarm module includes an LED alarm circuit, and the LED alarm circuit includes a first LED light and a second LED light, and the colors of the first LED light and the second LED light are different; the first LED light is electrically connected to the P0.2 port of the single-chip microcomputer, and the second LED light is electrically connected to the P1.6 port of the single-chip microcomputer; wherein, The single chip microcomputer is also used to control the first LED light to turn on when the pressure value exceeds the pressure alarm high pressure threshold, and control the photoelectric coupling module to electrically turn on the external fan; and to control the second LED light to turn on when the pressure value is lower than the pressure alarm low pressure threshold, and control the photoelectric coupling module to electrically turn off the external fan.

6. The electronic wind pressure switch main control board according to claim 5, characterized in that: The alarm module also includes a buzzer alarm circuit; The buzzer alarm circuit includes a voltage source, a buzzer and a transistor; the first electrode of the transistor is electrically connected to the voltage source through the buzzer, the second electrode of the transistor is grounded, and the control electrode of the transistor is electrically connected to the P0.7 port of the single-chip microcomputer; wherein, The single chip microcomputer is also used to control the buzzer to alarm when the pressure value is lower than the pressure alarm low pressure threshold.

7. The electronic wind pressure switch main control board according to any one of claims 1 to 3, characterized in that: Also included is an edge-triggered shift register circuit; The data input end of the edge-triggered shift register circuit is electrically connected to the P1.3 port of the single-chip microcomputer, the clock signal end is electrically connected to the P1.5 port of the single-chip microcomputer, and the output end of the edge-triggered shift register is electrically connected to the input end of the display module.

8. The electronic wind pressure switch main control board according to any one of claims 1 to 3, characterized in that: It also includes the main program download module; The first port of the main program download module is electrically connected to a voltage source, the second port of the main program download module is electrically connected to a P1.6 port of the single-chip microcomputer, the third port of the main program download module is electrically connected to a P0.2 port of the single-chip microcomputer, and the fourth port of the main program download module is grounded.

9. The electronic wind pressure switch main control board according to claim 8, characterized in that: Also includes a backup program download module; The first port of the standby program download module is grounded, the second port of the standby program download module is electrically connected to the P0.7 port of the single-chip microcomputer, the third port of the standby program download module is electrically connected to the P0.6 port of the single-chip microcomputer, and the fourth port of the standby program download module is electrically connected to a voltage source.

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