Intelligent well lid terminal monitoring circuit

Abstract

The utility model discloses an intelligent well lid terminal monitoring circuit, which is characterized in that an environment detection module and a wireless communication module are controlled by a main control module to carry out real-time cloud detection on a well lid, and the environment detection module can test states of opening, temperature, displacement, damage and the like of the well lid to carry out monitoring and judgment; the environment detection module detects that the well lid is in an abnormal state, namely, when the situation occurs, the environment detection module sends collected information to the main control chip, the main control chip analyzes and judges the information, and if the data exceed a set threshold value, the main control chip sends well lid data to the software platform in real time through the wireless communication module; the software platform can monitor the well lid in real time and regulate and control the data of the well lid through the wireless communication module; the well lid is further provided with a Hall switch, the well lid can be opened only through a specific magnetic key, the safety protection performance of the well lid is improved, and the well lid is prevented from being stolen or mistakenly opened.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent monitoring, in particular to an intelligent manhole cover terminal monitoring circuit. Background Art

[0002] With the rapid economic development of various cities in my country, the basic building facilities in the cities are constantly improving, and the construction of smart cities is also steadily following up. Based on my country's huge and complex underground pipeline system, manhole covers play an important role in assisting the management and control of underground pipelines. However, the manhole covers in most cities currently have a single function, high cost of manual maintenance and repair, and great difficulty in management. In addition, other problems such as theft or damage of manhole covers cannot be known in the first time, causing great social security risks. They can only be known through daily inspections by patrol personnel and reports from enthusiastic citizens. In fact, it is also difficult for the public to contact the department responsible for maintaining the manhole covers. Most people have no way to quickly get the contact information in the first time. Therefore, there is an urgent need for a smart manhole cover that can remotely monitor the manhole cover in real time through the Internet of Things technology. Utility Model Content

[0003] In view of the shortcomings of the above-mentioned technology that the manhole cover management is relatively difficult and the manhole cover status cannot be monitored, the utility model provides an intelligent manhole cover terminal monitoring circuit.

[0004] In order to achieve the above object, the utility model provides an intelligent manhole cover terminal monitoring circuit, which is characterized by comprising:

[0005] The environmental detection module collects information about whether the manhole cover is tilted, whether the manhole cover is immersed in water, whether the manhole cover is leaking light or cracking, and whether the manhole cover is dragged and displaced to generate a detection signal;

[0006] A main control module, responding to the detection signal and generating a corresponding driving signal according to the signal source;

[0007] A wireless communication module is used to respond to the driving signal, send the real-time data of the manhole cover to the software platform, and alert the software platform when the manhole cover is in an abnormal state;

[0008] The power supply module is used to provide power to the environment detection module, the main control module and the wireless communication module.

[0009] As an improved solution of the present utility model, the main control module includes a main control chip; the environment detection module includes an angle detection circuit, a liquid detection circuit, a temperature detection circuit and a photosensitivity detection circuit, the angle detection circuit includes a gravity acceleration chip, and the temperature detection circuit includes; the wireless communication module includes a wireless communication chip, a SIM card circuit and a level matching circuit.

[0010] As an improved solution of the present utility model, the gravity acceleration chip includes a first angle detection pin, a second angle detection pin, a third angle detection pin, a fourth angle detection pin and a fifth angle detection pin, the first angle detection pin is coupled to the ground, the second angle detection pin is connected to the first angle signal pin of the main control chip, the third angle detection pin is connected to the second angle signal pin of the main control chip, the fourth angle detection pin is connected to the third angle signal pin of the main control chip; the fifth angle detection pin is connected to the fourth angle signal pin of the main control chip.

[0011] As an improved solution of the present utility model, the liquid detection circuit includes a first liquid detection pin and a second liquid detection pin, the first liquid detection pin is coupled to the first liquid signal pin and the second liquid signal pin of the main control chip, and the second liquid detection pin is coupled to the ground.

[0012] As an improved solution of the present utility model, the photosensitivity detection circuit includes a first photoresistor and a second photoresistor, one end of the first photoresistor and one end of the second photoresistor are coupled to the ground, and one end of the first photoresistor and the other end of the second photoresistor are connected to the first photosensitivity signal pin, the second photosensitivity signal pin, the third photosensitivity signal pin and the fourth photosensitivity signal pin of the main control chip.

[0013] As an improved solution of the present utility model, the main control chip includes a first temperature detection pin and a second temperature detection pin, the temperature detection circuit includes a voltage-stabilizing diode Z1 and a temperature measuring resistor, the first temperature detection pin is connected to one end of the temperature measuring resistor through the voltage-stabilizing diode Z1, and the other end of the temperature measuring resistor is coupled to the second temperature detection pin.

[0014] As an improved solution of the utility model, the level matching circuit includes a first transistor and a second transistor, the main control chip includes a first level signal pin and a second level signal pin, the wireless communication chip includes a first level enable pin and a second level enable pin, the first level enable pin is connected to the first level signal pin through the first transistor, and the second level enable pin is connected to the second level signal pin through the second transistor.

[0015] As an improved solution of the utility model, the power module includes a battery power supply and voltage collection circuit and a DC-DC boost circuit; the battery voltage collection circuit includes a first voltage output pin, a second voltage output pin and a first MOS tube, the first voltage output pin is connected to the first MOS tube and coupled to BAT- and the voltage detection pin of the main control chip, and the second voltage output pin is coupled to the ground; the DC-DC boost circuit includes a communication boost chip, the communication boost chip includes a first boost enable pin, a second boost enable pin, a third boost enable pin and a second MOS tube, the first boost enable pin is coupled to the boost signal pin and BAT+ of the main control chip through the second MOS tube, the second boost enable pin is coupled to the power input pin of the wireless communication chip, and the third boost enable pin is coupled to the ground.

[0016] As an improved solution of the utility model, the main control module adopts a main control chip of model HC32L176KATA, the wireless communication module adopts a 3.6V wireless communication chip of model BC28, and the power module adopts a lithium sub-A type ER18505 battery pack.

[0017] As an improved solution of the utility model, it also includes a piezoelectric buzzer and a Hall switch, one output pin of the piezoelectric buzzer is coupled to the ground, and the other output pin is coupled to the main control chip; the Hall switch includes a first switch enable pin, a second switch enable pin and a third switch enable pin, the first switch enable pin is coupled to BAT1, the second switch enable pin is coupled to the ground, and the third switch enable pin is connected to the switch signal pin of the main control chip.

[0018] The beneficial effect of the utility model is as follows: compared with the prior art, the intelligent manhole cover terminal monitoring circuit provided by the utility model controls the environmental detection module and the wireless communication module through the main control module to perform real-time cloud detection of the manhole cover. The environmental detection module can test the status including the opening, temperature, displacement and damage of the manhole cover for monitoring and judgment. When the environmental detection module detects that the manhole cover is in an abnormal state, that is, when the above situation occurs, the environmental detection module sends the collected information to the main control chip, and the main control chip analyzes and judges. If the data exceeds the set threshold, the main control chip will send the manhole cover data to the software platform in real time through the wireless communication module. The software platform can monitor the manhole cover in real time and regulate the data of the manhole cover through the wireless communication module. The manhole cover is also provided with a Hall switch, which can be opened by a specific magnetic key, thereby improving the safety and protection of the manhole cover to prevent theft or accidental opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a module interaction diagram of the utility model;

[0020] Figure 2 This is the circuit diagram of the main control chip of the utility model;

[0021] Figure 3 This is the battery voltage collection circuit diagram of the utility model;

[0022] Figure 4 This is the buzzer circuit diagram of the utility model;

[0023] Figure 5 This is the Hall switch circuit diagram of the utility model;

[0024] Figure 6 This is a circuit diagram of a wireless communication chip of the utility model;

[0025] Figure 7 This is a circuit diagram of a SIM card of the present utility model;

[0026] Figure 8 This is a level matching circuit diagram of the utility model;

[0027] Fig. 9 This is a DC-DC boost circuit diagram of the utility model;

[0028] Fig.10 Angle detection circuit diagram of the utility model;

[0029] Fig.11 This is a liquid detection circuit diagram of the utility model;

[0030] Fig.12 This is a photosensitivity detection circuit diagram of the utility model;

[0031] Fig.13 This is a temperature detection circuit diagram of the utility model;

[0032] Fig.14 This is a schematic diagram of the battery voltage changing with temperature of the present utility model. DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0034] In the following description, example details are given to provide a deeper understanding of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. It should be understood that the specific embodiments are only used to explain the utility model, and are not used to limit the utility model.

[0035] It should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the existence of features, integers, steps, operations, elements or components, but do not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components or combinations thereof.

[0036] In the existing technology, the manhole covers in most cities have a single function, the cost of manual maintenance and repair is high, the management is difficult, and other problems such as theft or damage of the manhole covers cannot be known in the first time, causing great social security risks. They can only be known through daily inspections by patrol personnel and reports from enthusiastic citizens. But in fact, it is difficult for the public to contact the department responsible for maintaining the manhole covers. Therefore, there is an urgent need for a smart manhole cover that can remotely monitor the manhole covers in real time through the Internet of Things technology.

[0037] In order to solve the above technical problems, the utility model provides an intelligent manhole cover terminal monitoring circuit. Figure 1-Figure 14 , including an environment detection module, a main control module, a wireless communication module, and a power module, wherein the environment detection module is used to collect information on whether the manhole cover is tilted, whether the manhole cover is immersed in water, whether the manhole cover is leaking light and cracking, and whether the manhole cover is dragged and displaced to generate a detection signal; the main control module is used to respond to the detection signal and generate a corresponding drive signal according to the signal source; the wireless communication module is used to respond to the drive signal, send the real-time data of the manhole cover to the software platform, and remind the software platform when the manhole cover is in an abnormal state; the power module is used to provide power to the environment detection module, the main control module, and the wireless communication module; through the above circuit, the environment detection module sends different detection data to the main control module, and the main control module analyzes the detection data to determine whether the detected value exceeds the set alarm threshold. If it exceeds, the abnormal situation of the manhole cover is reported to the software platform through the wireless communication module and the piezoelectric buzzer is used to sound an alarm. The management personnel can monitor in real time on the software platform through the wireless communication module, and can change and adjust the data of the manhole cover and remotely set the data information of the manhole cover.

[0038] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and Fig.10, and also includes a gravity acceleration chip U3 of model BMA253, and the gravity acceleration chip U8 includes a first angle detection pin, a second angle detection pin, a third angle detection pin, a fourth angle detection pin and a fifth angle detection pin, which correspond to pins 1, 2, 12, 5 and 6 of the gravity acceleration chip U8 respectively; wherein the first angle detection pin is coupled to the ground, and the second angle detection pin is connected to the first angle signal pin of the main control chip U1 (corresponding to pin 59 of the main control chip U1), The third angle detection pin is connected to the second angle signal pin of the main control chip U1 (corresponding to pin 58 of the main control chip U1), the fourth angle detection pin is connected to the third angle signal pin of the main control chip U1 (corresponding to pin 56 of the main control chip U1); the fifth angle detection pin is connected to the fourth angle signal pin of the main control chip U1 (corresponding to pin 57 of the main control chip U1); through the above connection, the signal interaction between the gravity acceleration chip U8 and the main control chip U1 is realized, and the gravity acceleration chip U8 can detect the angle of the manhole cover. The state is judged to realize the signal interaction between the gravity acceleration chip U8 and the main control chip U1. The gravity acceleration chip U8 can judge the angle state of the manhole cover. In daily life, the manhole cover will be subjected to various situations such as various vehicles running over, road vibration or pedestrians stepping on it, so the gravity acceleration chip U8 can detect the inclination angle of the manhole cover to determine whether the manhole cover is displaced or dislocated. By setting the installation angle of the manhole cover to an absolute angle of 0°, when the manhole cover is lifted, the gravity acceleration chip U8 detects that the manhole cover is Whether the angle between the manhole cover and the installation plane exceeds the threshold. When the tilt angle is greater than the threshold and less than 90°, the manhole cover is judged to be in a tilted posture. If the tilt angle is greater than the threshold and greater than 90°, the manhole cover is judged to be in a flipped posture. When the gravity acceleration chip U8 detects that the angle of the manhole cover has changed, the corresponding data is sent to the software platform by the main control chip U1. After the normal angle is restored, the full data is reported to the software platform again, and a standby signal is generated. The main control chip U1 responds to the standby signal and goes into standby mode to achieve power saving.

[0039] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and Fig.11The liquid detection circuit includes a first liquid detection pin and a second liquid detection pin. The first liquid detection pin is coupled to the first liquid signal pin (corresponding to pin 23 of the main control chip U1) and the second liquid signal pin (corresponding to pin 47 of the main control chip U1) of the main control chip U1. The second liquid detection pin is coupled to the ground. The liquid detection circuit determines whether the manhole cover is immersed in water or whether water overflows from the inside of the manhole cover by detecting the conductivity value of the stainless steel electrode on the manhole cover. The main control chip U1 analyzes the conductivity value of the stainless steel electrode to determine the specific water immersion condition of the manhole cover. The main control chip U1 uses the wireless communication module to alarm the software platform and report the specific information of the manhole cover.

[0040] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and Fig.12 The light-sensitive detection circuit includes a first photoresistor RL1 and a second photoresistor RL2. One end of the first photoresistor RL1 and one end of the second photoresistor RL2 are coupled to the ground, and the other ends are connected to a first light-sensitive signal pin (corresponding to pin 19 of the main control chip U1), a second light-sensitive signal pin (corresponding to pin 22 of the main control chip U1), a third light-sensitive signal pin (corresponding to pin 36 of the main control chip U1) and a fourth light-sensitive signal pin (corresponding to pin 48 of the main control chip U1) of the main control chip U1. The light-sensitive detection circuit determines whether the manhole cover is damaged, cracked or incomplete according to the intensity of the external light source. The first photoresistor RL1 and the second photoresistor RL2 receive the external light source, and the main control chip U1 calculates the resistance change of the first photoresistor RL1 and the second photoresistor RL2 to obtain the light intensity data, and sends the detected light intensity data to the main control chip U1. The main control chip U1 analyzes the light intensity data and sends it to the software platform through the wireless communication module.

[0041] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and Fig.13The main control chip U1 includes a first temperature detection pin (corresponding to pin 18 of the main control chip U1) and a second temperature detection pin (corresponding to pin 20 of the main control chip U1). The temperature detection circuit includes a voltage-stabilizing diode Z1 and a temperature-measuring resistor R19. The first temperature detection pin is connected to one end of the temperature-measuring resistor R19 through the voltage-stabilizing diode Z1, and the other end of the temperature-measuring resistor R19 is coupled to the second temperature detection pin. The voltage of the voltage-stabilizing diode Z1 maintains the voltage 2.5V reference voltage in the temperature detection circuit to improve the stability of the overall circuit. One end of the temperature-measuring resistor R19 connected to the voltage-stabilizing diode Z1 provides a pull-up resistor to limit the current. Since the output voltage of the battery under different temperature conditions is not equal and changes in a certain regularity, the ambient temperature is calculated by collecting the resistance change in the temperature-measuring resistor R19 and cooperating with the output voltage of the battery. The detection temperature working range is between -20°C and 70°C, and can be calculated in conjunction with the ambient temperature detected by the temperature detection circuit.

[0042] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and Fig. 9 The DC-DC boost circuit includes a communication boost chip U3, and the communication boost chip U3 includes a first boost enable pin, a second boost enable pin, a third boost enable pin, and a second MOS tube, which correspond to pins 4, 1, and 3 of the communication boost chip U3, respectively. The first boost enable pin is coupled to the boost signal pin (corresponding to pin 41 of the main control chip U1) and BAT+ of the main control chip U1 through the second MOS tube, and the second boost enable pin is coupled to the power input pin of the wireless communication chip U2 (corresponding to pin 44 of the wireless communication chip U2). , the third boost enable pin is coupled to the ground. Since the voltage of the circuit will be affected by various factors and reduced, a stable input voltage is provided to the wireless communication chip U2 through the boost circuit, and the voltage is stabilized by the communication boost chip U3. The first boost enable pin of the communication boost chip U3 is connected to the second MOS tube, and the gate voltage in the second MOS tube is controlled to change the output of the drain voltage to regulate the voltage output by the battery BAT+. The second MOS tube also protects the boost circuit from burning, ensuring that the wireless communication chip U2 is not affected by the battery voltage. Please see the attached Fig.14 Because the voltage output by the battery will change under different temperature conditions, especially in high and low temperature environments, the difference in the output voltage values ​​is large. The battery voltage will change drastically due to temperature fluctuations. Unstable voltage will affect the operation of the wireless communication chip U2, resulting in network fluctuations in remote monitoring, which in turn affects the real-time communication monitoring of the manhole cover. Therefore, the DC-DC boost circuit is used to enable the wireless communication chip to have a stable voltage input to ensure the normal operation of the manhole cover communication function.

[0043] In another embodiment, all technical features of the above embodiments are included, see Figure 2 and attached Figure 4-5 , also includes a piezoelectric buzzer and a Hall switch HR, one output pin of the piezoelectric buzzer is coupled to the ground, and the other output pin is coupled to the main control chip U1; in the specific solution, the main control chip U1 has a sound signal pin, which corresponds to pin No. 16 of the main control chip U1, and is connected to the piezoelectric buzzer through the pin. The piezoelectric buzzer is also connected to BAT+ to realize the transmission of the working voltage and then drive the piezoelectric buzzer. When the main control chip U1 receives the abnormal detection signal, it will send an output signal to the piezoelectric buzzer for a sound reminder, thereby improving the safety alarm function of the manhole cover, and the piezoelectric buzzer has a long service life, does not generate radio frequency noise, and has lower energy consumption than a normal buzzer; the Hall switch HR It includes a first switch enable pin, a second switch enable pin and a third switch enable pin. The first switch enable pin is coupled to BAT1, the second switch enable pin is coupled to the ground, and the third switch enable pin is connected to the switch signal pin of the main control chip U1 (corresponding to pin 42 of the main control chip U1). Since the touch switch previously set has a great risk of being accidentally opened by humans or small animals, the use of a contactless Hall switch HR can avoid the above situation. A specific magnetic key is required to control the opening and closing of the Hall switch HR, which improves safety. As a semiconductor component, the Hall switch HR has the characteristics of long service life, fast response time, strong anti-interference ability and low power consumption, and is extremely suitable for use on manhole covers.

[0044] In another embodiment, all technical features of the above embodiments are included, see Figure 2-Figure 3 and Figure 6 The battery power supply and voltage collection circuit includes a first voltage output pin of a battery BAT1 (corresponding to pin 1 of the battery BAT1), a second voltage output pin (corresponding to pin 2 of the battery BAT1) and a first MOS switch Q3. The first voltage output pin is connected to the first MOS tube Q3 and then coupled to BAT- and a voltage detection pin of a main control chip (corresponding to pin 33 of the main control chip U1). The second voltage output pin is coupled to the ground. The first voltage output pin is connected to the first MOS tube Q3 to prevent the output voltage from decreasing, and to prevent reverse connection, to prevent the battery from being burned, and to effectively reduce current energy consumption. A resistor R13 is connected between the first MOS tube Q3 and the voltage detection pin. The resistor R13 is used to detect the voltage value passing through the first MOS tube Q3. The voltage detection pin collects voltage through the resistor R13.

[0045] In another embodiment, all technical features of the above embodiments are included, see Figure 2 , Figure 6 and Figure 8The level matching circuit includes a first transistor and a second transistor, the main control chip includes a first level signal pin (corresponding to pin 31 of the main control chip U1) and a second level signal pin (corresponding to pin 18 of the main control chip U1), the wireless communication chip includes a first level enable pin (corresponding to pin 17 of the wireless communication chip U2) and a second level enable pin (corresponding to pin 18 of the wireless communication chip U2), the first level enable pin is connected to the first level signal pin through the first transistor Q8, the second level enable pin is connected to the second level signal pin through the second transistor Q9, and the first level enable pin is connected to the second level signal pin through the first transistor The transistor Q8 is connected to the first level signal pin, and the second level enable pin is connected to the second level signal pin of the main control chip U1 through the second transistor Q9. In order to make the communication of the wireless communication module stable, transistors Q8 and transistors Q9 are set in the level matching circuit to ensure the stable connection between the wireless communication circuit and the main control chip U1, and maintain high-level output and input. When the first level signal pin inputs a high-level signal, the first transistor Q8 is turned off, and the first level enable pin outputs a high-level signal. Similarly, when the second level enable pin inputs a high-level signal, the second transistor Q9 is turned off, and the second level signal pin inputs a high-level signal.

[0046] In another embodiment, all the technical features of the above embodiments are included, and the SIM card circuit includes a first communication pin (corresponding to pin 1 of SIM card U5), a second communication pin (corresponding to pin 3 of SIM card U5), a third communication pin (corresponding to pin 8 of SIM card U5), a fourth communication pin (corresponding to pin 6 of SIM card U5) and a fifth communication pin (corresponding to pin 7 of SIM card U5), and the first communication pin, the second communication pin, the third communication pin, the fourth communication pin and the fifth communication pin are respectively connected to the first transmission pin (corresponding to pin 10 of wireless communication chip U2), the second transmission pin (corresponding to pin 11 of wireless communication chip U2), and the fifth communication pin (corresponding to pin 12 of wireless communication chip U2). The SIM card is a patch design, and the SIM card is welded on the manhole cover. The NB-IOT narrowband Internet of Things has the advantages of low power consumption, low cost and wide coverage. Through SIM card communication, the information of the manhole cover can be stably transmitted to the software platform, and the clock time will be calibrated once a day to avoid errors in recording time.

[0047] In another embodiment, all the technical features of the above embodiments are included, the main control module adopts the main control chip of model HC32L176KATA, the wireless communication module adopts the 3.6V wireless communication chip U2 of model BC28, the power module adopts the lithium-substrate A type ER18505 battery pack in parallel with the super capacitor of model 1520, the super capacitor can store energy and provide instantaneous large current power supply capability to ensure the stability and reliability of instantaneous high-power RF transmission of communication; the lithium-substrate A type battery pack consists of three lithium-substrate batteries in parallel, the lithium-substrate A type battery has a large capacity of 12000mAh, as a disposable battery, it can provide a power supply time of at least 3 years and up to 5 years, and the model of the communication boost chip U3 is XT3608.

[0048] The advantages of the utility model are:

[0049] 1) A gravity acceleration sensor is set up to detect whether the manhole cover is displaced or opened.

[0050] 2) Set liquid contacts to confirm whether the manhole cover is in a submerged or wading state.

[0051] 3) Use the temperature measuring resistor to calculate the ambient temperature of the manhole cover.

[0052] 4) Use a photoresistor to confirm whether the manhole cover is open or has leaks or damage.

[0053] 5) Set up a level matching circuit to ensure stable communication between the wireless communication module and the main control module.

[0054] 6) Set up a Hall switch that can only be opened with a specific magnetic key to ensure that the manhole cover will not be opened at will and to ensure project safety.

[0055] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An intelligent manhole cover terminal monitoring circuit, characterized in that: include: Environmental detection module, which is used to collect information on whether the manhole cover is tilted, whether the manhole cover is soaked in water, whether the manhole cover is leaking light or cracked, and whether the manhole cover is dragged and displaced to generate a detection signal; A main control module, which is used to respond to the detection signal and generate a corresponding driving signal according to the signal source; A wireless communication module is used to respond to the driving signal, send the real-time data of the manhole cover to the software platform, and alert the software platform when the manhole cover is in an abnormal state; The power supply module is used to provide power to the environment detection module, the main control module and the wireless communication module.

2. The intelligent manhole cover terminal monitoring circuit according to claim 1 is characterized in that: The main control module includes a main control chip; the environment detection module includes an angle detection circuit, a liquid detection circuit, a temperature detection circuit and a photosensitivity detection circuit, and the angle detection circuit includes a gravity acceleration chip; the wireless communication module includes a wireless communication chip, a SIM card circuit and a level matching circuit, and the power supply module includes a battery power supply and voltage acquisition circuit and a DC-DC boost circuit.

3. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The gravity acceleration chip includes a first angle detection pin, a second angle detection pin, a third angle detection pin, a fourth angle detection pin and a fifth angle detection pin. The first angle detection pin is coupled to the ground, the second angle detection pin is connected to the first angle signal pin of the main control chip, the third angle detection pin is connected to the second angle signal pin of the main control chip, the fourth angle detection pin is connected to the third angle signal pin of the main control chip; the fifth angle detection pin is connected to the fourth angle signal pin of the main control chip.

4. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The liquid detection circuit includes a first liquid detection pin and a second liquid detection pin, the first liquid detection pin is coupled to a first liquid signal pin and a second liquid signal pin of a main control chip, and the second liquid detection pin is coupled to the ground.

5. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The photosensitivity detection circuit includes a first photoresistor and a second photoresistor, one end of the first photoresistor and one end of the second photoresistor are coupled to the ground, and the other ends are connected to the first photosensitivity signal pin, the second photosensitivity signal pin, the third photosensitivity signal pin and the fourth photosensitivity signal pin of the main control chip.

6. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The main control chip includes a first temperature detection pin and a second temperature detection pin. The temperature detection circuit includes a voltage-stabilizing diode and a temperature measuring resistor. The first temperature detection pin is connected to one end of the temperature measuring resistor through the voltage-stabilizing diode, and the other end of the temperature measuring resistor is coupled to the second temperature detection pin.

7. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The level matching circuit includes a first transistor and a second transistor, the main control chip includes a first level signal pin and a second level signal pin, the wireless communication chip includes a first level enable pin and a second level enable pin, the first level enable pin is connected to the first level signal pin through the first transistor, and the second level enable pin is connected to the second level signal pin through the second transistor.

8. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The power module includes a battery power supply and voltage collection circuit and a DC-DC boost circuit; the battery voltage collection circuit includes a first voltage output pin, a second voltage output pin and a first MOS tube, the first voltage output pin is connected to the first MOS tube and coupled to BAT- and the voltage detection pin of the main control chip, and the second voltage output pin is coupled to the ground; the DC-DC boost circuit includes a communication boost chip, the communication boost chip includes a first boost enable pin, a second boost enable pin, a third boost enable pin and a second MOS tube, the first boost enable pin is coupled to the boost signal pin and BAT+ of the main control chip through the second MOS tube, the second boost enable pin is coupled to the power input pin of the wireless communication chip, and the third boost enable pin is coupled to the ground.

9. The intelligent manhole cover terminal monitoring circuit according to claim 2 is characterized in that: The main control module adopts a main control chip of model HC32L176KATA, the wireless communication module adopts a 3.6V wireless communication chip of model BC28, and the power module adopts a lithium sub-A type ER18505 battery pack.

10. The intelligent manhole cover terminal monitoring circuit according to claim 2, characterized in that: It also includes a piezoelectric buzzer and a Hall switch, one output pin of the piezoelectric buzzer is coupled to the ground, and the other output pin is coupled to the main control chip; the Hall switch includes a first switch enable pin, a second switch enable pin and a third switch enable pin, the first switch enable pin is coupled to BAT1, the second switch enable pin is coupled to the ground, and the third switch enable pin is connected to the switch signal pin of the main control chip.

Images