Multipurpose rainfall monitoring tester

Abstract

The utility model relates to a multipurpose rainfall monitoring tester, comprising a microprocessor module, the microprocessor module is electrically connected with an LED display module, a relay output module, a reed switch test module, an isolation power supply module and a power supply module, the relay output module is used for simulating a switch of a rainfall tester, and the reed switch test module is used for testing the rainfall. The reed switch test module is used for detecting the state of a reed switch, the isolated power supply module is electrically connected with the reed switch test module, and the power supply module is electrically connected with the LED display module, the relay output module, the reed switch test module and the isolated power supply module. The utility model has the advantage of facilitating the monitoring of the rainfall tester.

Description

Technical Field

[0001] This utility model belongs to the field of rainfall measurement instrument technology, specifically relating to a multi-purpose rainfall monitoring instrument. Background Technology

[0002] As a crucial component of the front-end data acquisition system for rainfall (intensity) monitoring cloud systems, the reliability of rain gauges directly impacts the accuracy of precipitation data, particularly in railway systems used for flood forecasting. However, during on-site installation and maintenance, malfunctions such as false alarms or missed alarms frequently occur due to aging lines, damaged sensing components, or improper connections.

[0003] Traditional detection methods rely on cloud systems and upper-level relay units (similar to routers), which are not only cumbersome and complex to operate, but also lack intuitiveness, are costly, and inconvenient. Therefore, developing a portable field detection device that can operate independently and is easy to use for testing rainfall meters has become a key requirement for ensuring the normal operation of rainfall monitoring systems. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-purpose rainfall monitoring instrument that is easy to monitor with a rainfall meter.

[0005] The technical solution of this utility model is as follows:

[0006] A multi-purpose rainfall monitoring and testing instrument includes a microprocessor module. The microprocessor module is electrically connected to an LED display module, a relay output module, a reed switch testing module, an isolated power supply module, and a power supply module. The relay output module is used to simulate the switching of the rainfall monitoring instrument. The reed switch testing module is used to detect the status of the reed switch. The isolated power supply module is electrically connected to the reed switch testing module.

[0007] The power supply module is electrically connected to the LED display module, the relay output module, the reed switch test module, and the isolation power supply module, respectively.

[0008] Furthermore, the relay output module includes a transistor Q1, a resistor R8, a relay J1, a capacitor C4, a diode D3, a capacitor C9, a resistor R11, and a terminal P1. The transistor Q1 and the resistor R8 are both connected in parallel to VCC and the PULSE pin of the microprocessor module. The transistor Q1 is also connected in parallel to pin 2 of the relay J1, the diode D3, and the capacitor C9. The other end of pin 2 of the relay J1, the diode D3, and the capacitor C9 is grounded.

[0009] Pins 3 and 4 of the relay J1 are respectively connected to capacitor C4, resistor R11 and terminal P1, wherein capacitor C4 and resistor R11 are connected in series and capacitor C4 and terminal P1 are connected in parallel.

[0010] Furthermore, the reed switch test module includes an optocoupler E1, resistors R15 and R18, capacitor C10 and R20, diode D8, terminal P3, and capacitor C16. Pin 3 of the optocoupler E1 is connected to the SW1IN pin of the microprocessor module and resistor R15. The other end of resistor R15 is grounded. Pin 4 of the optocoupler E1 is connected to VCC. Pins 1 and 2 of the optocoupler E1 are both connected to terminal P3. Pins 1 and 2 of the optocoupler E1 are connected in parallel to resistor R18, capacitor C10, and diode D8. Resistor R20 is connected in series to pin 1 of the optocoupler E1 and terminal P3, and is connected to one end of resistor R18, capacitor C10, and diode D8.

[0011] The terminal P3 is also connected to an isolation power supply module and a capacitor C16.

[0012] The capacitor C16, resistor R18, capacitor C10, diode D8, and pin 2 of optocoupler E1 are grounded.

[0013] Furthermore, the isolated power supply module includes a transistor Q4, a resistor R10, a capacitor C17, a power supply module M1, a diode D9, and a terminal P5. The transistor Q4 is connected to VCC, the ON12V pin of the microprocessor module, the capacitor C17, and pin 2 of the power supply module M1. The resistor R10 is connected in parallel on the line connecting the transistor Q4 to VCC and the ON12V pin of the microprocessor module. The capacitor C17 and pin 1 of the power supply module M1 are both grounded. Pin 4 of the power supply module M1 is connected in series with the diode D9 and the terminal P5. The capacitor C16 and the terminal P3 are connected on the line connecting the terminal P5 and the diode D9. Pin 3 of the power supply module M1 and the terminal P5 are both grounded.

[0014] Furthermore, the power supply module includes a charging management module, a power switch module, a boost module, and a low voltage detection module. The charging management module is equipped with a battery and is connected to the power switch module. The power switch module is connected to both the boost module and the low voltage detection module. The microprocessor module is connected to the power switch module, the boost module, and the low voltage detection module. The boost module is connected to the LED display module, the relay output module, the reed switch test module, and the isolated power supply module.

[0015] Furthermore, the boost module includes an inductor L1, a capacitor C13, a capacitor C14, a resistor R25, a boost chip U3, and a capacitor C15. The inductor L1 and the capacitor C13 are both connected to the power switch module. The inductor L1 is connected to pin 6 of the boost chip U3 and the resistor R25. The resistor R25 is connected to the capacitor C14. Pins 1 and 2 of the boost chip are both connected to the capacitor C15 and VCC.

[0016] The capacitors C13, C14, pin 4 of the boost chip U3, and C15 are all grounded.

[0017] Furthermore, the low voltage detection module includes resistors R26 and R27 connected in series with the power switch module. The line connecting resistors R26 and R27 is connected to the LOWV_ADC1 pin of the microprocessor module, and the other end of resistor R27 is grounded.

[0018] Furthermore, the power switch module includes resistor R13, transistor Q3, capacitor C8, rotary encoder K1, resistors R19, R21, R22, capacitors C11, C12, diodes D7 and D6, transistor Q3, resistors R17 and R16. Pin 2 of transistor Q2 and resistor R13 are both connected to the charging management module. Pin 3 of transistor Q2, capacitor C8, resistor R26, capacitor C13 and inductor L1 are connected. The other end of capacitor C8 and pin 5 of rotary encoder K1 are both grounded. Pin 1 of transistor Q3 and resistor R13 are both connected to transistor Q3 and diode D6. The other pin of transistor Q3 is connected to resistors R17 and R16 respectively. Resistor R17 is connected to pin S1 of microprocessor module. Resistor R16 and the last pin of transistor Q3 are both grounded.

[0019] Pin 4 of the rotary encoder K1 is connected to diodes D6 and D7 respectively. Diode D7, resistor R22, capacitor C12 and S2 pin of the microprocessor module are connected together. Capacitors C12 and C11 and pin 2 of the rotary encoder K1 are all grounded. Capacitor C11, resistor R19, pin 1 of the rotary encoder K1 and ECA pin of the microprocessor module are connected together. Pin 3 of the rotary encoder K1, resistor R21 and ECB pin of the microprocessor module are connected together. Resistors R19, R21 and R22 are all connected to VCC.

[0020] Furthermore, the LED display module includes an IIC bus interface P4, a resistor R24, and a resistor R23. Pin 1 of the IIC bus interface P4 is connected to VCC, resistor R24, and resistor R23, respectively. Resistor R24 ​​is connected to the SDA pin of the microprocessor module and pin 2 of the IIC bus interface P4, respectively. Resistor R23 is connected to the SCL pin of the microprocessor module and pin 3 of the IIC bus interface P4, respectively. Pin 4 of the IIC bus interface is grounded.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. This utility model is based on an embedded microprocessor module and a multifunctional circuit system that achieves unified management and coordination of multiple modules such as power management, signal processing, input / output control, and LED data display. It provides a stable power supply to the rain gauge through an isolated power supply module to block the intrusion of external interference signals, thereby improving the anti-interference capability of the device. It simulates the action of a reed switch through a relay output module and monitors the status of the reed switch through a reed switch test module, thus facilitating the monitoring of the rain gauge.

[0023] In summary, this invention has the advantage of facilitating monitoring by rainfall measuring instruments. Attached Figure Description

[0024] Figure 1 This is a circuit diagram of the microprocessor module of this utility model;

[0025] Figure 2 This is a circuit diagram of the LED display module of this utility model;

[0026] Figure 3 This is a circuit diagram of the relay output module of this utility model;

[0027] Figure 4 This is the circuit diagram of the reed switch test module of this utility model;

[0028] Figure 5 This is a circuit diagram of the isolated power supply module of this utility model;

[0029] Figure 6 This is a circuit diagram of the charging management module of this utility model;

[0030] Figure 7 This is the circuit diagram of the power switch module of this utility model;

[0031] Figure 8 This is a circuit diagram of the low voltage detection module of this utility model;

[0032] Figure 9 This is the circuit diagram of the boost module of this utility model. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] like Figures 1 to 9 As shown, the multi-purpose rainfall monitoring and testing instrument includes a microprocessor module. The microprocessor module is electrically connected to an LED display module, a relay output module, a reed switch testing module, an isolation power supply module, and a power supply module. The relay output module is used to simulate the switching of the rainfall monitoring instrument. The reed switch testing module is used to detect the status of the reed switch. The isolation power supply module is electrically connected to the reed switch testing module.

[0035] The power supply module is electrically connected to the LED display module, the relay output module, the reed switch test module, and the isolation power supply module, respectively.

[0036] The microprocessor module uses an STC microcontroller to implement functions such as control input signal acquisition, relay J1 output control, LED display logic, low voltage detection, and power management. Specifically, the STC microcontroller is an STC8H1K08 microcontroller. Pins 8 and 9 of the STC microcontroller are connected to VCC and capacitor C5. Both capacitor C5 and pin 10 of the STC microcontroller are grounded. The TX pin of the STC microcontroller is connected in series with resistor R14 and pin 3 of terminal P2. The RX pin of the STC microcontroller is connected in series with diode D5 and pin 2 of terminal P2. Pin 1 of terminal P2 is connected to VCC, and pin 4 of terminal P2 is grounded.

[0037] In this embodiment, the relay output module includes a transistor Q1, a resistor R8, a relay J1, a capacitor C4, a diode D3, a capacitor C9, a resistor R11, and a terminal P1. The transistor Q1 and the resistor R8 are both connected in parallel to VCC and the PULSE pin of the microprocessor module. The transistor Q1 is also connected in parallel to pin 2 of the relay J1, the diode D3, and the capacitor C9. The other end of pin 2 of the relay J1, the diode D3, and the capacitor C9 is grounded.

[0038] Pins 3 and 4 of the relay J1 are respectively connected to capacitor C4, resistor R11 and terminal P1, wherein capacitor C4 and resistor R11 are connected in series and capacitor C4 and terminal P1 are connected in parallel.

[0039] During testing, the STC microcontroller controls the relay output module to send a pulse signal. The STC microcontroller then controls transistor Q1 (MOSFET) to drive relay J1 to close, simulating the reed switch action of a rain gauge to achieve the on / off switching of the monitoring signal, i.e., a switching output. The relay output module has four pulse width settings (groups), which are selected by the user via rotary encoder K1. The four pulse width settings and duty cycles are shown in the table below.

[0040]

[0041] When it is necessary to simulate the reed switch being turned on, the STC microcontroller outputs a low level to pin G (gate) of transistor Q1, which turns on pins D and S of transistor Q1, and then applies the working voltage to the drive coil of relay J1 to close the contacts. The closing time is determined by the STC microcontroller according to the position in the table above.

[0042] When the time is up, the STC microcontroller sends a high level to pin G of transistor Q1, causing Q1 to turn off. Relay J1 loses its operating voltage, and its contacts release. Capacitor C9 and diode D3 in the circuit diagram are coil protection devices for relay J1, preventing damage from back electromotive force. Capacitor C4 and resistor R11 are contact protection devices for relay J1, preventing electrical sparks during switching on and off. The count value for each switching operation is displayed on the LED screen.

[0043] In this embodiment, the reed switch test module includes an optocoupler E1, resistors R15 and R18, capacitor C10, resistor R20, diode D8, terminal P3, and capacitor C16. Diode D8 is a bidirectional transient suppression diode. Pin 3 of optocoupler E1 is connected to the SW1IN pin of the microprocessor module and resistor R15. The other end of resistor R15 is grounded. Pin 4 of optocoupler E1 is connected to VCC. Pins 1 and 2 of optocoupler E1 are both connected to terminal P3. Pins 1 and 2 of optocoupler E1 are connected in parallel to resistor R18, capacitor C10, and diode D8. Resistor R20 is connected in series to pin 1 of optocoupler E1 and terminal P3, and is connected to one end of resistor R18, capacitor C10, and diode D8.

[0044] The terminal P3 is also connected to an isolation power supply module and a capacitor C16.

[0045] The capacitor C16, resistor R18, capacitor C10, diode D8, and pin 2 of optocoupler E1 are grounded.

[0046] The isolated power supply module includes a transistor Q4, a resistor R10, a capacitor C17, a power supply module M1, a diode D9, and a terminal P5. The transistor Q4 is connected to VCC, the ON12V pin of the microprocessor module, the capacitor C17, and pin 2 of the power supply module M1. The resistor R10 is connected in parallel on the line connecting the transistor Q4 to VCC and the ON12V pin of the microprocessor module. The capacitor C17 and pin 1 of the power supply module M1 are both grounded. The diode D9 and the terminal P5 are connected in series on pin 4 of the power supply module M1. The capacitor C16 and the terminal P3 are connected on the line connecting the terminal P5 and the diode D9. The pin 3 of the power supply module M1 and the terminal P5 are both grounded.

[0047] The isolated power supply module provides 12V power to the rain gauge. To prevent electrical interference, isolation devices such as power supply module M1 and optocoupler E1 are specially designed to block the intrusion of external interference signals, completely physically isolating the connection between external electrical components and this device, thus improving the device's anti-interference capability.

[0048] Transistor Q4 is the switch for the isolated power module. Since this device is portable, low power consumption is a primary design goal. When the input detection function is not used, all external devices are not powered to achieve low power consumption and extend battery life. Optocoupler E1 provides electrical isolation between this device and external switching signal devices. When the external rain gauge's switch signal is activated, it provides at least 2.1V to the diode terminal of optocoupler E1, causing the photodiode inside E1 to light up. This, in turn, excites the photodiode at the other end of the optocoupler, causing pins 3 and 4 of optocoupler E1 to conduct. This provides the STC microcontroller with a low-to-high signal. Upon receiving this signal, the STC microcontroller first performs a dejitter detection. If it confirms a true conduction state (not a momentary connection caused by interference or mechanical jitter), it performs an external pulse count (normal operation count). If this conduction state continues for 2 seconds without disconnection, the external sensor is considered faulty (adhesive). Diode D8 and capacitor C10 form a protection circuit for optocoupler E1. Resistors R20 and R18 are current-limiting devices for optocoupler E1. Each time an external switch is detected to be on, the STC microcontroller counts the number of pulses and displays the counted pulses on the LED screen.

[0049] In this embodiment, the power supply module includes a charging management module, a power switch module, a boost module, and a low voltage detection module. The charging management module is equipped with a battery and is connected to the power switch module. The power switch module is connected to both the boost module and the low voltage detection module. The microprocessor module is connected to the power switch module, the boost module, and the low voltage detection module. The boost module is connected to the LED display module, the relay output module, the reed switch test module, and the isolated power supply module.

[0050] In this embodiment, the boost module includes an inductor L1, a capacitor C13, a capacitor C14, a resistor R25, a boost chip U3, and a capacitor C15. The inductor L1 and the capacitor C13 are both connected to the power switch module. The inductor L1 is connected to pin 6 of the boost chip U3 and the resistor R25. The resistor R25 is connected to the capacitor C14. Pins 1 and 2 of the boost chip are both connected to the capacitor C15 and VCC.

[0051] The capacitors C13, C14, pin 4 of the boost chip U3, and C15 are all grounded.

[0052] In this embodiment, the low voltage detection module includes resistor R26 and resistor R27 connected in series with the power switch module. The line connecting resistor R26 and resistor R27 is connected to the LOWV_ADC1 pin of the microprocessor module, and the other end of resistor R27 is grounded.

[0053] In this embodiment, the power switch module includes a resistor R13, a transistor Q3, a capacitor C8, a rotary encoder K1, resistors R19, R21, R22, capacitors C11 and C12, a diode D7, a diode D6, a transistor Q3, a resistor R17, and a resistor R16. Pin 2 of the transistor Q2 and resistor R13 are both connected to the charging management module. Pin 3 of the transistor Q2, capacitor C8, resistor R26, capacitor C13, and inductor L1 are connected together. The other end of capacitor C8 and pin 5 of the rotary encoder K1 are both grounded. Pin 1 of the transistor and resistor R13 are both connected to transistor Q3 and diode D6. The other pin of transistor Q3 is connected to resistors R17 and R16 respectively. Resistor R17 is connected to pin S1 of the microprocessor module. Resistor R16 and the last pin of transistor Q3 are both grounded.

[0054] Pin 4 of the rotary encoder K1 is connected to diodes D6 and D7 respectively. Diode D7, resistor R22, capacitor C12 and S2 pin of the microprocessor module are connected together. Capacitors C12 and C11 and pin 2 of the rotary encoder K1 are all grounded. Capacitor C11, resistor R19, pin 1 of the rotary encoder K1 and ECA pin of the microprocessor module are connected together. Pin 3 of the rotary encoder K1, resistor R21 and ECB pin of the microprocessor module are connected together. Resistors R19, R21 and R22 are all connected to VCC.

[0055] In this embodiment, the LED display module includes an IIC bus interface P4, resistors R24 and R23. Pin 1 of the IIC bus interface P4 is connected to VCC, resistors R24 and R23 respectively. Resistor R24 ​​is connected to the SDA pin of the microprocessor module and pin 2 of the IIC bus interface P4 respectively. Resistor R23 is connected to the SCL pin of the microprocessor module and pin 3 of the IIC bus interface P4 respectively. Pin 4 of the IIC bus interface P4 is grounded. The LED display screen is connected to the STC microcontroller through the IIC bus interface.

[0056] In this embodiment, the power switch module adopts a one-button power switch control. Pressing and holding the power switch button can realize the power switch function. The low voltage detection module is used to detect whether the battery voltage is lower than the set value. The LED display shows that the voltage is low and needs to be charged. The set value can be set by the user as needed.

[0057] The charging management module includes a USB1 charging port. Resistors R5, R6, and R7 are connected in parallel between pin A9 of the USB1 charging port and pins 4 and 8 of the charging chip U2. Resistor R3 is connected to pin B5 of the USB1 charging port, and resistor R4 is connected to pin A5 of the USB1 charging port. Capacitor C1 is connected to pin B9 of the USB1 charging port and is electrically connected to pin A9 of the USB1 charging port. Resistors R9, capacitor C2, and capacitor C3 are connected to pins 4 and 8 of the charging chip U2. Diode D4, a red-green bicolor LED, is connected to resistor R9 and diode D4. Resistor R12 is connected to pin 2 of the charging chip U2. Capacitor C6, battery BT1, battery C7, resistor R13, and transistor Q2 are connected to pin 5 of the charging chip U2.

[0058] Pins 1-4, A12, and B12 of the USB1 interface are all grounded. Resistors R3 and R4, capacitors C1, C2, and C3 are all grounded. Resistors R12 and C6, battery BT1, and battery C7 are all grounded.

[0059] The USB1 port is a Type-C port, and the BT1 battery is a 3.7V battery.

[0060] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-purpose rainfall monitoring and testing instrument, characterized in that: It includes a microprocessor module, which is electrically connected to an LED display module, a relay output module, a reed switch test module, an isolation power supply module, and a power supply module. The relay output module is used to simulate the switching of a rain gauge, the reed switch test module is used to detect the status of the reed switch, and the isolation power supply module is electrically connected to the reed switch test module. The power supply module is electrically connected to the LED display module, the relay output module, the reed switch test module, and the isolation power supply module, respectively.

2. The multi-purpose rainfall monitoring and testing instrument according to claim 1, characterized in that: The relay output module includes a transistor Q1, a resistor R8, a relay J1, a capacitor C4, a diode D3, a capacitor C9, a resistor R11, and a terminal P1. The transistor Q1 and the resistor R8 are both connected in parallel to VCC and the PULSE pin of the microprocessor module. The transistor Q1 is also connected in parallel to pin 2 of the relay J1, the diode D3, and the capacitor C9. The other end of pin 2 of the relay J1, the diode D3, and the capacitor C9 is grounded. Pins 3 and 4 of the relay J1 are respectively connected to capacitor C4, resistor R11 and terminal P1, wherein capacitor C4 and resistor R11 are connected in series and capacitor C4 and terminal P1 are connected in parallel.

3. The multi-purpose rainfall monitoring and testing instrument according to claim 2, characterized in that: The reed switch test module includes an optocoupler E1, resistors R15 and R18, capacitors C10 and R20, a diode D8, a terminal block P3, and a capacitor C16. Pin 3 of the optocoupler E1 is connected to the SW1IN pin of the microprocessor module and resistor R15. The other end of resistor R15 is grounded. Pin 4 of the optocoupler E1 is connected to VCC. Pins 1 and 2 of the optocoupler E1 are both connected to terminal block P3. Pins 1 and 2 of the optocoupler E1 are connected in parallel with resistor R18, capacitor C10, and diode D8. Resistor R20 is connected in series with pin 1 of the optocoupler E1 and terminal block P3, and is connected to one end of resistor R18, capacitor C10, and diode D8. The terminal P3 is also connected to an isolation power supply module and a capacitor C16. The capacitor C16, resistor R18, capacitor C10, diode D8, and pin 2 of optocoupler E1 are grounded.

4. The multi-purpose rainfall monitoring and testing instrument according to claim 3, characterized in that: The isolated power supply module includes a transistor Q4, a resistor R10, a capacitor C17, a power supply module M1, a diode D9, and a terminal P5. The transistor Q4 is connected to VCC, the ON12V pin of the microprocessor module, the capacitor C17, and pin 2 of the power supply module M1. The resistor R10 is connected in parallel on the line connecting the transistor Q4 to VCC and the ON12V pin of the microprocessor module. The capacitor C17 and pin 1 of the power supply module M1 are both grounded. The diode D9 and the terminal P5 are connected in series on pin 4 of the power supply module M1. The capacitor C16 and the terminal P3 are connected on the line connecting the terminal P5 and the diode D9. The pin 3 of the power supply module M1 and the terminal P5 are both grounded.

5. The multi-purpose rainfall monitoring and testing instrument according to claim 4, characterized in that: The power supply module includes a charging management module, a power switch module, a boost module, and a low voltage detection module. The charging management module is equipped with a battery and is connected to the power switch module. The power switch module is connected to both the boost module and the low voltage detection module. The microprocessor module is connected to the power switch module, the boost module, and the low voltage detection module. The boost module is connected to the LED display module, the relay output module, the reed switch test module, and the isolated power supply module.

6. The multi-purpose rainfall monitoring and testing instrument according to claim 5, characterized in that: The boost module includes an inductor L1, a capacitor C13, a capacitor C14, a resistor R25, a boost chip U3, and a capacitor C15. The inductor L1 and capacitor C13 are both connected to the power switch module. The inductor L1 is connected to pin 6 of the boost chip U3 and resistor R25. Resistor R25 is connected to capacitor C14. Pins 1 and 2 of the boost chip are both connected to capacitor C15 and VCC. The capacitors C13, C14, pin 4 of the boost chip U3, and C15 are all grounded.

7. The multi-purpose rainfall monitoring and testing instrument according to claim 6, characterized in that: The low voltage detection module includes resistors R26 and R27 connected in series with the power switch module. The line connecting resistors R26 and R27 is connected to the LOWV_ADC1 pin of the microprocessor module, and the other end of resistor R27 is grounded.

8. The multi-purpose rainfall monitoring and testing instrument according to claim 7, characterized in that: The power switch module includes resistor R13, transistor Q3, capacitor C8, rotary encoder K1, resistors R19, R121, R22, capacitors C11 and C12, diodes D7 and D6, transistor Q3, resistors R17 and R16. Pin 2 of transistor Q2 and resistor R13 are both connected to the charging management module. Pin 3 of transistor Q2, capacitor C8, resistor R26, capacitor C13 and inductor L1 are connected. The other end of capacitor C8 and pin 5 of rotary encoder K1 are both grounded. Pin 1 of transistor Q3 and resistor R13 are both connected to transistor Q3 and diode D6. The other pin of transistor Q3 is connected to resistors R17 and R16 respectively. Resistor R17 is connected to pin S1 of microprocessor module. Resistor R16 and the last pin of transistor Q3 are both grounded. Pin 4 of the rotary encoder K1 is connected to diodes D6 and D7 respectively. Diode D7, resistor R22, capacitor C12 and S2 pin of the microprocessor module are connected together. Capacitors C12 and C11 and pin 2 of the rotary encoder K1 are all grounded. Capacitor C11, resistor R19, pin 1 of the rotary encoder K1 and ECA pin of the microprocessor module are connected together. Pin 3 of the rotary encoder K1, resistor R21 and ECB pin of the microprocessor module are connected together. Resistors R19, R21 and R22 are all connected to VCC.

9. The multi-purpose rainfall monitoring and testing instrument according to claim 6, characterized in that: The LED display module includes an IIC bus interface P4, resistors R24 and R23. Pin 1 of the IIC bus interface P4 is connected to VCC, resistors R24 and R23 respectively. Resistor R24 ​​is connected to the SDA pin of the microprocessor module and pin 2 of the IIC bus interface P4 respectively. Resistor R23 is connected to the SCL pin of the microprocessor module and pin 3 of the IIC bus interface P4 respectively. Pin 4 of the IIC bus interface P4 is grounded.

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