Outdoor LED advertisement screen fault remote detection system based on onenet Internet of Things

Abstract

The utility model discloses an outdoor LED advertisement screen fault remote detection system based on onenet Internet of Things. The system comprises a system detection device, a system transmission device, an onenet Internet of Things cloud platform and a user terminal which are in communication connection in sequence. A current analog signal of a power supply box used by the LED advertisement screen is acquired through a current acquisition sensor, the received current analog signal is isolated through an optocoupler isolation unit and then is transmitted to a first microprocessor for analog-to-digital conversion, a current digital signal is acquired, and the current digital signal is transmitted to system transmission equipment; total current data information is obtained through the system transmission equipment according to the received current digital signal and is transmitted to the onenet Internet of Things cloud platform; and comparing the total current data information with a preset total current threshold value through the onenet Internet of Things cloud platform to obtain an LED advertisement screen detection signal, and sending the LED advertisement screen detection signal to a user side to realize remote fault detection of the outdoor LED advertisement screen.

Description

Technical Field

[0001] The utility model relates to the technical field of outdoor LED advertising screen fault remote detection, in particular to an outdoor LED advertising screen fault remote detection system based on the OneNet Internet of Things. Background Art

[0002] For practitioners engaged in the integration of LED outdoor advertising screen systems, many outdoor advertising projects, including LED large-screen advertisements, bus stop advertisements, merchant light box advertisements, etc., are particularly difficult to maintain in the later stages. People have to be sent to drive to each project site to check every day, and the maintenance cost is very high. If problems are not discovered in a timely manner, customers will complain and deduct maintenance fees. If there is some way to remotely monitor the working status of the outdoor advertising screens they installed so that the system can be maintained in a targeted manner, it will greatly save maintenance costs and improve work efficiency. To remotely determine whether an advertising lighting device is working properly, the most intuitive way is to use a device to replace the human eye, and transmit videos or pictures of the device working to the maintenance personnel, who will determine whether the device is working properly to decide whether it is necessary to go to the site for maintenance;

[0003] At present, traditional LED outdoor advertising screens use industrial-grade video surveillance equipment to monitor the advertising screens by taking photos or videos to obtain video streams. Since video surveillance equipment requires various performance requirements such as protection from rain, lightning, wind and sun, the equipment is expensive. In addition, video surveillance equipment or systems need to be configured with expensive traffic cards and need to develop dedicated server software and client software on a shared cloud. At the same time, when the number of outdoor LED advertising screens is small, maintenance personnel can use the pictures and video data obtained by video surveillance equipment to diagnose and maintain faults, but when there are many pictures or video data, it is more difficult, which leads to the problem of difficulty in installation and high facility costs. Summary of the invention

[0004] The utility model provides an outdoor LED advertising screen fault remote detection system based on the onenet Internet of Things to overcome the above technical problems.

[0005] In order to achieve the above purpose, the technical solution of the utility model is:

[0006] A onenet Internet of Things-based outdoor LED advertising screen fault remote detection system, the outdoor LED advertising screen includes a plurality of sub-screen units, including a power box connected to each sub-screen unit and a system detection device, a system transmission device, a onenet Internet of Things cloud platform and a user terminal that are sequentially communicated and connected;

[0007] The system detection device includes a current acquisition sensor, an optical coupling isolation unit, a voltage conversion module, a first microprocessor and a first wireless communication module; and the voltage conversion module is used to convert the voltage of a preset external power supply to power the current acquisition sensor, the optical coupling isolation unit, the microprocessor and the first wireless communication module;

[0008] The current acquisition sensor is used to collect the current flowing into the power box to obtain a current analog signal, and transmit the collected current analog signal to the optical coupling isolation unit; the optical coupling isolation unit is used to isolate the received current analog signal, and transmit the isolated current analog signal to the first microprocessor;

[0009] The first microprocessor is used to perform analog-to-digital conversion on the output signal of the optical coupling isolation unit, obtain a current digital signal, and transmit the current digital signal to a system transmission device by controlling the first wireless communication module;

[0010] The system transmission device includes a power module and a second wireless communication module connected to the power module, a second microprocessor and a NB-IoT module; and the second microprocessor is used to control the second wireless communication module to receive the current digital signal, and can obtain total current data information according to the received current digital signal;

[0011] The NB-IoT module is communicatively connected with the second microprocessor, and is used to transmit the total current data information to the onenet IoT cloud platform, and the onenet IoT cloud platform is used to compare the received total current data information with a preset total current threshold value to obtain an LED advertising screen detection signal;

[0012] The onenet Internet of Things cloud platform is communicatively connected with a user terminal, and the user terminal is used to receive a detection signal of an LED advertising screen to realize remote fault detection of an outdoor LED advertising screen.

[0013] Furthermore, the connection circuit of the current acquisition sensor includes a current acquisition chip, and the current acquisition chip is specifically a HLW8110 chip;

[0014] Pin 1 of the current acquisition chip is connected to one end of the first resistor R1 and one end of the second capacitor C2, pin 2 of the current acquisition chip is connected to one end of the third resistor R3 and one end of the third capacitor C3, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded;

[0015] The other end of the first resistor R1 is connected to one end of the second resistor R2 and pin 1 of the wiring terminal P2, and pin 2 of the wiring terminal P2 is connected to one end of the power box (i.e., the 220V input end L of the power box); the other end of the third resistor R3 is grounded to the other end of the second resistor R2 and the other end of the power box (i.e., the 220V output end N of the power box);

[0016] Pin 3 of the current acquisition chip is connected to one end of the fifth capacitor C5, one end of the ninth resistor R9 and one end of the fifth resistor R5, and the other end of the fifth capacitor C5 and the other end of the ninth resistor R9 are grounded; the other end of the fifth resistor R5 is sequentially connected to the eighth resistor R8, the fourth resistor R4, the seventh resistor R7 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to one end of the power box, and pin 4 of the current acquisition chip is grounded;

[0017] Pin 5 of the current acquisition chip is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded, pin 6 / pin 7 of the current acquisition chip are respectively connected to the A_TXD / A_RXD terminals of the optocoupler isolation unit, and pin 8 of the current acquisition chip is connected to one end of the first capacitor C1 and the A_5V terminal of the optocoupler isolation unit, and the other end of the first capacitor C1 is grounded.

[0018] Furthermore, the connection circuit of the optical coupling isolation unit includes a first isolation chip and a second isolation chip, and the first isolation chip and the second isolation chip are specifically PS2501;

[0019] Pin 1 of the first isolation chip is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the D_3V3 terminal, pin 2 of the first isolation chip is connected to pin 11 of the first microprocessor, and the first microprocessor is specifically an MSP430FR2100 single-chip microcomputer, pin 3 of the first isolation chip is grounded, pin 4 of the first isolation chip is connected to one end of the eleventh resistor R11 and the A_RXD terminal of the optocoupler isolation unit, and the other end of the eleventh resistor R11 is connected to the A_5V terminal;

[0020] Pin 1 of the second isolation chip is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the A_5V terminal, pin 2 of the second isolation chip is connected to the A_TXD terminal of the optocoupler isolation unit, pin 3 of the second isolation chip is grounded, pin 4 of the second isolation chip is connected to one end of the thirteenth resistor R13 and pin 12 of the first microprocessor, and the other end of the thirteenth resistor R13 is connected to the D_3V3 terminal.

[0021] Furthermore, the second microprocessor adopts MSP430FR2033 single chip microcomputer.

[0022] Further, the connection circuit of the NB-IoT module includes a first module chip, a second module chip and a third module chip, and the first module chip is specifically BC26, the second module chip is specifically SIMCARD, and the third module chip is specifically SMF05C;

[0023] Pin 1 of the second module chip is connected to pin 14 of the first module chip, pin 5 of the third module chip and one end of a ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded; Pin 2 of the second module chip is connected to pin 4 of the third module chip and one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to one end of the eighth capacitor C8 and pin 12 of the first module chip;

[0024] Pin 3 of the second module chip is connected to pin 3 of the third module chip and one end of a fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to one end of a seventh capacitor C7 and pin 13 of the first module chip, and the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded, and pin 4 of the second module chip is grounded;

[0025] Pin 6 of the second module chip is connected to pin 6 of the third module chip, one end of the sixth capacitor C6 and one end of the sixteenth resistor R16, and the other end of the sixth capacitor C6 is grounded; the other end of the sixteenth resistor R16 is connected to one end of the seventeenth resistor R17 and pin 11 of the first module chip, and the other end of the seventeenth resistor R17 is connected to pin 14 of the first module chip.

[0026] Furthermore, the first wireless communication module and the second wireless communication module are both 2.4G wireless communication modules, and the chip of the 2.4G wireless communication module is si24r1.

[0027] Beneficial effect: The utility model provides an outdoor LED advertising screen fault remote detection system based on the onenet Internet of Things. The current acquisition sensor of the system detection equipment collects the current analog signal of the power box used by the LED advertising screen, and the received current analog signal is isolated by the optocoupler isolation unit and transmitted to the first microprocessor to perform analog-to-digital conversion on the output signal of the optocoupler isolation unit to obtain the current digital signal, and the current digital signal is transmitted to the system transmission equipment through the first wireless communication module; and the system transmission equipment obtains the total current data information according to the received current digital signal and transmits it to the onenet Internet of Things cloud platform; the total current data information is compared with the preset total current threshold through the onenet Internet of Things cloud platform to obtain the LED advertising screen detection signal, and the LED advertising screen detection signal is sent to the user end to realize remote fault detection of the outdoor LED advertising screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a schematic diagram of the outdoor LED advertising screen fault remote detection system based on the onenet Internet of Things of the present utility model;

[0030] Figure 2 It is a connection circuit schematic diagram of the current acquisition sensor in the basic embodiment;

[0031] Figure 3 This is a schematic diagram of the connection circuit of the optocoupler isolation unit in the basic embodiment;

[0032] Figure 4 The first microprocessor chip pin diagram in the basic embodiment;

[0033] Figure 5 This is a pin diagram of the second microprocessor chip in the basic embodiment;

[0034] Figure 6 This is a schematic diagram of the connection circuit of the NB-IoT module in the basic embodiment. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] This embodiment provides a remote fault detection system for outdoor LED advertising screens based on the onenet Internet of Things. Figure 1 As shown, the outdoor LED advertising screen includes several sub-screen units, including a power box connected to each sub-screen unit and a system detection device, a system transmission device, a onenet IoT cloud platform and a user terminal that are sequentially connected in communication; and the transmission device has the function of data interaction with the onenet IoT cloud platform; the user terminal is specifically a PC console or a mobile phone APP;

[0037] Specifically, the outdoor LED advertising screen includes a plurality of sub-screen units connected in parallel or in series according to actual needs, wherein if the connection mode of each sub-screen unit in the outdoor LED advertising screen is series connection, only one system detection device needs to be set to detect the current of the circuit of the connection line of its power box; if the connection mode of each sub-screen unit in the outdoor LED advertising screen is parallel connection, then a system detection device needs to be separately set for each sub-screen unit to detect the current of the circuit of the connection line of its power box;

[0038] The system detection device includes a current acquisition sensor, an optical coupling isolation unit, a voltage conversion module, a first microprocessor and a first wireless communication module; and the voltage conversion module is used to convert the voltage of a preset external power supply, that is, the voltage conversion module converts the 220V mains power into a 3.3V voltage to provide power for the current acquisition sensor, the optical coupling isolation unit, the microprocessor and the first wireless communication module;

[0039] The current acquisition sensor is used to collect or measure the current flowing into the power box to obtain a current analog signal, and transmit the collected current analog signal to the optical coupling isolation unit; the optical coupling isolation unit is used to isolate the received current analog signal, and transmit the isolated current analog signal to the first microprocessor;

[0040] The first microprocessor is used to perform analog-to-digital conversion on the output signal of the optical coupling isolation unit, obtain a current digital signal, and transmit the current digital signal to a system transmission device by controlling the first wireless communication module;

[0041] The system transmission device includes a power module and a second wireless communication module connected to the power module, a second microprocessor and a NB-IoT module; and the second microprocessor is used to control the second wireless communication module to receive the current digital signal, and can obtain total current data information according to the received current digital signal, wherein the total current data information is obtained by accumulating the obtained current digital signal through the second microprocessor, wherein the power module is specifically a battery;

[0042] The NB-IoT module is communicatively connected with the second microprocessor, and is used to transmit the total current data information to the onenet IoT cloud platform, and the onenet IoT cloud platform is used to compare the received total current data information with a preset total current threshold value to obtain an LED advertising screen detection signal;

[0043] The onenet IoT cloud platform is connected to the user end through Ethernet or WiFi communication, and the user end is used to receive the LED advertising screen detection signal to realize remote fault detection of the outdoor LED advertising screen.

[0044] In this embodiment, the current analog signal of the power box used for the LED advertising screen is collected by the current acquisition sensor of the system detection device, and the received current analog signal is isolated by the optical coupling isolation unit, and then transmitted to the first microprocessor to perform analog-to-digital conversion on the output signal of the optical coupling isolation unit to obtain the current digital signal, and the current digital signal is transmitted to the system transmission device through the first wireless communication module; and the total current data information is obtained according to the received current digital signal by the system transmission device and transmitted to the onenet Internet of Things cloud platform; the total current data information is compared with the preset total current threshold through the onenet Internet of Things cloud platform to obtain the LED advertising screen detection signal, and the LED advertising screen detection signal is sent to the user end to realize the remote fault detection of the outdoor LED advertising screen, which greatly improves the efficiency and timeliness of the fault detection work of the outdoor LED advertising screen, and saves the equipment installation cost and labor cost. At the same time, the current status of the entire system is detected in real time through the onenet Internet of Things cloud platform to determine whether a fault occurs, that is, if the total current data information obtained is less than the preset total current threshold, it is confirmed that the outdoor LED advertising screen is faulty. The outdoor LED advertising screen fault remote detection system in this embodiment has the advantages of low cost, easy installation, and strong reliability.

[0045] In a specific embodiment, Figure 2 As shown, the connection circuit of the current acquisition sensor includes a current acquisition chip, and the current acquisition chip is specifically the HLW8110 chip of Heliwei Company;

[0046] Pin 1 of the current acquisition chip is connected to one end of the first resistor R1 and one end of the second capacitor C2, pin 2 of the current acquisition chip is connected to one end of the third resistor R3 and one end of the third capacitor C3, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded;

[0047] The other end of the first resistor R1 is connected to one end of the second resistor R2 and pin 1 of the wiring terminal P2, and pin 2 of the wiring terminal P2 is connected to one end of the power supply box; the other end of the third resistor R3 is grounded to the other end of the second resistor R2 and the other end of the power supply box;

[0048] Pin 3 of the current acquisition chip is connected to one end of the fifth capacitor C5, one end of the ninth resistor R9 and one end of the fifth resistor R5, and the other end of the fifth capacitor C5 and the other end of the ninth resistor R9 are grounded; the other end of the fifth resistor R5 is sequentially connected to the eighth resistor R8, the fourth resistor R4, the seventh resistor R7 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to one end of the power box, and pin 4 of the current acquisition chip is grounded;

[0049] Pin 5 of the current acquisition chip is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded, pin 6 / pin 7 of the current acquisition chip are respectively connected to the A_TXD / A_RXD terminals of the optocoupler isolation unit, and pin 8 of the current acquisition chip is connected to one end of the first capacitor C1 and the A_5V terminal of the optocoupler isolation unit, and the other end of the first capacitor C1 is grounded.

[0050] In a specific embodiment, Figure 3 As shown, the connection circuit of the optical coupling isolation unit includes a first isolation chip and a second isolation chip, and the first isolation chip and the second isolation chip are specifically PS2501;

[0051] Pin 1 of the first isolation chip is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the D_3V3 terminal, and pin 2 of the first isolation chip is connected to pin 11 of the first microprocessor. Figure 4 As shown, the chip of the first microprocessor is specifically the MSP430FR2100 single-chip microcomputer of TI company, the pin 3 of the first isolation chip is grounded, the pin 4 of the first isolation chip is connected to one end of the eleventh resistor R11 and the A_RXD terminal of the optocoupler isolation unit, and the other end of the eleventh resistor R11 is connected to the A_5V terminal;

[0052] Pin 1 of the second isolation chip is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the A_5V terminal, pin 2 of the second isolation chip is connected to the A_TXD terminal of the optocoupler isolation unit, pin 3 of the second isolation chip is grounded, pin 4 of the second isolation chip is connected to one end of the thirteenth resistor R13 and pin 12 of the first microprocessor, and the other end of the thirteenth resistor R13 is connected to the D_3V3 terminal.

[0053] In a specific embodiment, Figure 5 As shown, the second microprocessor chip adopts the MSP430FR2033 single-chip microcomputer of TI Company.

[0054] In a specific embodiment, Figure 6 As shown, the connection circuit of the NB-IoT module includes a first module chip, a second module chip and a third module chip, and the first module chip is specifically a BC26 module of Quectel Communications, the second module chip is specifically a SIMCARD, and the third module chip is specifically SMF05C;

[0055] Pin 1 of the second module chip is connected to pin 14 of the first module chip, pin 5 of the third module chip and one end of a ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded; Pin 2 of the second module chip is connected to pin 4 of the third module chip and one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to one end of the eighth capacitor C8 and pin 12 of the first module chip;

[0056] Pin 3 of the second module chip is connected to pin 3 of the third module chip and one end of a fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to one end of a seventh capacitor C7 and pin 13 of the first module chip, and the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded, and pin 4 of the second module chip is grounded;

[0057] Pin 6 of the second module chip is connected to pin 6 of the third module chip, one end of the sixth capacitor C6 and one end of the sixteenth resistor R16, and the other end of the sixth capacitor C6 is grounded; the other end of the sixteenth resistor R16 is connected to one end of the seventeenth resistor R17 and pin 11 of the first module chip, and the other end of the seventeenth resistor R17 is connected to pin 14 of the first module chip.

[0058] In a specific embodiment, both the first wireless communication module and the second wireless communication module are 2.4G wireless communication modules, and the chip of the 2.4G wireless communication module is si24r1.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A remote fault detection system for outdoor LED advertising screens based on the onenet Internet of Things, wherein the outdoor LED advertising screen comprises a plurality of sub-screen units, characterized in that: It includes a power box connected to each sub-screen unit and a system detection device, a system transmission device, a onenet Internet of Things cloud platform and a user terminal that are sequentially connected in communication; The system detection device includes a current acquisition sensor, an optical coupling isolation unit, a voltage conversion module, a first microprocessor and a first wireless communication module; and the voltage conversion module is used to convert the voltage of a preset external power supply to power the current acquisition sensor, the optical coupling isolation unit, the microprocessor and the first wireless communication module; The current acquisition sensor is used to collect the current flowing into the power box to obtain a current analog signal, and transmit the collected current analog signal to the optical coupling isolation unit; the optical coupling isolation unit is used to isolate the received current analog signal, and transmit the isolated current analog signal to the first microprocessor; The first microprocessor is used to perform analog-to-digital conversion on the output signal of the optical coupling isolation unit, obtain a current digital signal, and transmit the current digital signal to a system transmission device by controlling the first wireless communication module; The system transmission device includes a power module and a second wireless communication module connected to the power module, a second microprocessor and a NB-IoT module; and the second microprocessor is used to control the second wireless communication module to receive the current digital signal, and can obtain total current data information according to the received current digital signal; The NB-IoT module is communicatively connected with the second microprocessor, and is used to transmit the total current data information to the onenet IoT cloud platform, and the onenet IoT cloud platform is used to compare the received total current data information with a preset total current threshold value to obtain an LED advertising screen detection signal; The onenet Internet of Things cloud platform is communicatively connected with a user terminal, and the user terminal is used to receive a detection signal of an LED advertising screen to realize remote fault detection of an outdoor LED advertising screen.

2. According to claim 1, a remote fault detection system for outdoor LED advertising screens based on onenet Internet of Things is characterized in that: The connection circuit of the current acquisition sensor includes a current acquisition chip, and the current acquisition chip is specifically a HLW8110 chip; Pin 1 of the current acquisition chip is connected to one end of the first resistor R1 and one end of the second capacitor C2, pin 2 of the current acquisition chip is connected to one end of the third resistor R3 and one end of the third capacitor C3, and the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded; The other end of the first resistor R1 is connected to one end of the second resistor R2 and pin 1 of the wiring terminal P2, and pin 2 of the wiring terminal P2 is connected to one end of the power supply box; the other end of the third resistor R3 is grounded to the other end of the second resistor R2 and the other end of the power supply box; Pin 3 of the current acquisition chip is connected to one end of the fifth capacitor C5, one end of the ninth resistor R9 and one end of the fifth resistor R5, and the other end of the fifth capacitor C5 and the other end of the ninth resistor R9 are grounded; the other end of the fifth resistor R5 is sequentially connected to the eighth resistor R8, the fourth resistor R4, the seventh resistor R7 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to one end of the power box, and pin 4 of the current acquisition chip is grounded; Pin 5 of the current acquisition chip is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is grounded, pin 6 / pin 7 of the current acquisition chip are respectively connected to the A_TXD / A_RXD terminals of the optocoupler isolation unit, and pin 8 of the current acquisition chip is connected to one end of the first capacitor C1 and the A_5V terminal of the optocoupler isolation unit, and the other end of the first capacitor C1 is grounded.

3. According to claim 2, a remote fault detection system for outdoor LED advertising screens based on onenet Internet of Things is characterized in that: The connection circuit of the optical coupling isolation unit includes a first isolation chip and a second isolation chip, and the first isolation chip and the second isolation chip are specifically PS2501; Pin 1 of the first isolation chip is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the D_3V3 terminal, pin 2 of the first isolation chip is connected to pin 11 of the first microprocessor, and the first microprocessor is specifically an MSP430FR2100 single-chip microcomputer, pin 3 of the first isolation chip is grounded, pin 4 of the first isolation chip is connected to one end of the eleventh resistor R11 and the A_RXD terminal of the optocoupler isolation unit, and the other end of the eleventh resistor R11 is connected to the A_5V terminal; Pin 1 of the second isolation chip is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the A_5V terminal, pin 2 of the second isolation chip is connected to the A_TXD terminal of the optocoupler isolation unit, pin 3 of the second isolation chip is grounded, pin 4 of the second isolation chip is connected to one end of the thirteenth resistor R13 and pin 12 of the first microprocessor, and the other end of the thirteenth resistor R13 is connected to the D_3V3 terminal.

4. According to claim 3, a remote fault detection system for outdoor LED advertising screens based on onenet Internet of Things is characterized in that: The second microprocessor adopts MSP430FR2033 single chip microcomputer.

5. According to claim 3, a remote fault detection system for outdoor LED advertising screens based on onenet Internet of Things is characterized in that: The connection circuit of the NB-IoT module includes a first module chip, a second module chip and a third module chip, and the first module chip is specifically BC26, the second module chip is specifically SIMCARD, and the third module chip is specifically SMF05C; Pin 1 of the second module chip is connected to pin 14 of the first module chip, pin 5 of the third module chip and one end of a ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded; Pin 2 of the second module chip is connected to pin 4 of the third module chip and one end of a fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to one end of the eighth capacitor C8 and pin 12 of the first module chip; Pin 3 of the second module chip is connected to pin 3 of the third module chip and one end of a fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected to one end of a seventh capacitor C7 and pin 13 of the first module chip, and the other end of the seventh capacitor C7 and the other end of the eighth capacitor C8 are grounded, and pin 4 of the second module chip is grounded; Pin 6 of the second module chip is connected to pin 6 of the third module chip, one end of the sixth capacitor C6 and one end of the sixteenth resistor R16, and the other end of the sixth capacitor C6 is grounded; the other end of the sixteenth resistor R16 is connected to one end of the seventeenth resistor R17 and pin 11 of the first module chip, and the other end of the seventeenth resistor R17 is connected to pin 14 of the first module chip.

6. According to claim 3, a remote fault detection system for outdoor LED advertising screens based on onenet Internet of Things is characterized in that: The first wireless communication module and the second wireless communication module are both 2.4G wireless communication modules, and the chip of the 2.4G wireless communication module is si24r1.

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