A blind area monitoring device for a low speed vehicle

Abstract

The utility model discloses an embodiment of low -speed car's blind area monitoring devices, including a casing, be equipped with the radar and a circuit board for gathering the distance of object in the preset range in the casing, the integrated control module, communication module, signal module and alarm module on the circuit board, control module connects communication module, signal module and alarm module, signal module connects radar, signal module is gathered to radar distance signal transmission for control module, when the control module judges this object to be located in the preset blind area according to distance signal, exports the alarm signal of effective control alarm module and carries out the flash alarm. Realized low -speed car's blind area monitoring, solved the problem that there is no circuit module of blind area radar monitoring applicable to two -wheeled car at present.

Description

Technical Field

[0001] This utility model relates to the field of radar technology, and in particular to a blind spot monitoring device for low-speed vehicles. Background Technology

[0002] The new national standard mandates the installation of BSD (Blind Spot Detection) systems (a type of blind spot monitoring radar system) in low-speed vehicles. Subsequent production of low-speed vehicles (such as motorcycles and electric vehicles) are required to have BSD systems installed for blind spot detection, providing warnings when objects approach. However, existing BSD systems are mostly used in automobiles, with the corresponding circuit modules integrated into the vehicle's central control unit. These modules not only perform blind spot radar detection but are also compatible with other existing vehicle functions, resulting in complex wiring and multiple functions. Currently, there is no suitable circuit module for installation on two-wheeled vehicles that only provides blind spot radar detection and alarm functions. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a blind spot monitoring device for low-speed vehicles, thereby solving the current problem of the lack of a circuit module suitable for blind spot radar monitoring of two-wheeled vehicles.

[0004] This utility model provides a blind spot monitoring device for low-speed vehicles, including a housing. Inside the housing are a radar for collecting distance data to objects within a preset range and a circuit board. The circuit board integrates a control module, a communication module, a signal module, and an alarm module. The control module is connected to the communication module, the signal module, and the alarm module. The signal module is connected to the radar.

[0005] The signal module transmits the distance signal collected by the radar to the control module. When the control module determines that the object is within the preset blind zone based on the distance signal, it outputs a valid alarm signal to control the alarm module to flash the alarm.

[0006] Optionally, in the blind spot monitoring device for low-speed vehicles, the control module includes an MCU, a first resistor, and peripheral circuitry; the power supply pin of the MCU is connected to the first power supply terminal, and the ground pin of the MCU is grounded; the PD0-OSC_IN pin, PD1-OSC_OUT pin, and NRST pin of the MCU are all connected to the peripheral circuitry; the PA3 pin of the MCU is connected to the DC power supply terminal; the PB0 and PB1 pins of the MCU are both connected to the alarm module; the PB2 pin of the MCU is grounded through the first resistor; the PB10, PB11, and PB12 pins of the MCU are all connected to the signal module; and the PA11 and PA12 pins of the MCU are both connected to the communication module.

[0007] Optionally, in the blind spot monitoring device for low-speed vehicles, the peripheral circuit includes a crystal oscillator, a second resistor, a third resistor, a first capacitor, a second capacitor, and a third capacitor;

[0008] The first pin of the crystal oscillator is connected to one end of the second resistor, one end of the first capacitor, and the PD0-OSC_IN pin of the MCU; the third pin of the crystal oscillator is connected to the other end of the second resistor, one end of the second capacitor, and the PD1-OSC_OUT pin of the MCU; the other end of the first capacitor is grounded; the second pin of the crystal oscillator is connected to the other end of the second capacitor and ground; the fourth pin of the crystal oscillator is grounded; one end of the third resistor is connected to the first power supply terminal; the other end of the third resistor is connected to one end of the third capacitor and the NRST pin of the MCU; and the other end of the third capacitor is grounded.

[0009] Optionally, in the blind spot monitoring device for low-speed vehicles, the communication module includes a communication chip, a filter, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, and an electrostatic protector.

[0010] The TXD pin of the communication chip is connected to the PA12 pin of the MCU, the RXD pin of the communication chip is connected to the PA11 pin of the MCU, the GND pin of the communication chip is grounded, the VCC pin of the communication chip is connected to the first power supply terminal, the CANL pin of the communication chip is connected to the 4th pin of the filter and one end of the fourth resistor, and the CANH pin of the communication chip is connected to the 3rd pin of the filter and one end of the fifth resistor; the 1st pin of the filter is connected to the other end of the fourth resistor, one end of the sixth resistor, one end of the fifth capacitor, the 1st pin of the electrostatic discharge device, and the CAN bus; the 2nd pin of the filter is connected to the other end of the fifth resistor, the other end of the sixth resistor, one end of the fourth capacitor, the 2nd pin of the electrostatic discharge device, and the CAN bus; the other ends of the fourth capacitor, the other ends of the fifth capacitor, and the 3rd pin of the electrostatic discharge device are all grounded.

[0011] Optionally, in the blind spot monitoring device for low-speed vehicles, the communication module further includes a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor, and a seventh capacitor;

[0012] One end of the seventh resistor is connected to the TXD pin of the communication chip, one end of the eighth resistor, and one end of the sixth capacitor; the other end of the seventh resistor is connected to the first power supply terminal, the other end of the sixth capacitor is connected to the GND pin of the communication chip and ground, the other end of the eighth resistor is connected to the PA12 pin of the MCU, one end of the ninth resistor is connected to the RXD pin of the communication chip, the other end of the ninth resistor is connected to one end of the seventh capacitor and the PA11 pin of the MCU, and the other end of the seventh capacitor is grounded.

[0013] Optionally, in the blind spot monitoring device for low-speed vehicles, the signal module includes an interface, a tenth resistor, an eleventh resistor, and a twelfth resistor;

[0014] The TX pin of the interface is connected to the PB11 pin of the MCU through the eleventh resistor, the RX pin of the interface is connected to the PB10 pin of the MCU through the tenth resistor, the IO pin of the interface is connected to one end of the twelfth resistor and the PB12 pin of the MCU, the other end of the twelfth resistor and the 3.3V pin of the interface are both connected to the first power supply terminal, and the GND pin of the interface is grounded.

[0015] Optionally, in the blind spot monitoring device for low-speed vehicles, the alarm module includes a first switch, a second switch, a first alarm light, a second alarm light, a thirteenth resistor, and a fourteenth resistor;

[0016] The base of the first switching transistor is connected to the PB0 pin of the MCU. The collector of the first switching transistor is connected to the negative terminal of the first alarm lamp through the thirteenth resistor. The positive terminal of the first alarm lamp is connected to the first power supply terminal. The emitter of the first switching transistor is grounded. The base of the second switching transistor is connected to the PB1 pin of the MCU. The collector of the second switching transistor is connected to the negative terminal of the second alarm lamp through the fourteenth resistor. The positive terminal of the second alarm lamp is connected to the first power supply terminal. The emitter of the second switching transistor is grounded.

[0017] Optionally, in the blind spot monitoring device for low-speed vehicles, the alarm module further includes a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor;

[0018] One end of the fifteenth resistor is connected to one end of the sixteenth resistor and the base of the first switch. The other end of the fifteenth resistor is connected to the PB0 pin of the MCU. The other end of the sixteenth resistor is connected to the emitter of the first switch and ground. One end of the seventeenth resistor is connected to one end of the eighteenth resistor and the base of the second switch. The other end of the seventeenth resistor is connected to the PB1 pin of the MCU. The other end of the eighteenth resistor is connected to the emitter of the second switch and ground.

[0019] The technical solution provided by this utility model embodiment includes a blind spot monitoring device for low-speed vehicles, comprising a housing. Inside the housing are a radar for collecting distance data to objects within a preset range and a circuit board. The circuit board integrates a control module, a communication module, a signal module, and an alarm module. The control module is connected to the communication module, the signal module, and the alarm module. The signal module is connected to the radar. The signal module transmits the distance signal collected by the radar to the control module. When the control module determines that the object is within the preset blind spot based on the distance signal, it outputs a valid alarm signal to control the alarm module to flash an alarm. This achieves blind spot monitoring for low-speed vehicles and solves the problem of the current lack of a circuit module suitable for blind spot radar monitoring of two-wheeled vehicles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the blind spot monitoring device for low-speed vehicles in this embodiment of the present invention.

[0021] Figure 2 This is a circuit diagram of the control module in an embodiment of the present invention.

[0022] Figure 3 This is a circuit diagram of the communication module in an embodiment of this utility model.

[0023] Figure 4 This is a circuit diagram of the signal module in an embodiment of the present invention.

[0024] Figure 5 This is a circuit diagram of the alarm module in an embodiment of this utility model. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments of the present utility model obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0026] It is readily understood that relational terms such as "first" and "second" are used merely to distinguish one entity, operation, or direction from another, without requiring or implying any actual relationship or order between these entities, operations, or directions. The directional terms such as "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom," mentioned or possibly used in this specification, are defined relative to the constructions shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be construed as restrictive. In the following description, various parameters and components are described for embodiments of different constructions. These specific parameters and components are merely examples and do not limit the embodiments of this application.

[0027] Please also refer to Figures 1 to 5 The blind spot monitoring device for low-speed vehicles provided in this embodiment includes a housing, within which a radar 20 and a circuit board 10 are housed. The circuit board 10 integrates a control module 11, a communication module 12, a signal module 13, and an alarm module 14. The control module 11 is connected to the communication module 12, the signal module 13, and the alarm module 14. The signal module 13 is connected to the radar 10. The radar collects the distance to objects within a preset range and transmits it to the signal module 13. The signal module 13 outputs a distance signal to the control module 11. When the control module 11 determines that the object is within the preset blind spot based on the distance signal, it outputs a valid alarm signal (LED1 signal and LED2 signal) to control the alarm module 14 to flash an alarm.

[0028] In this embodiment, the radar 20 is a high-precision 24-79GHz band millimeter-wave radar. The circuit board 10 can be applied to all radar-equipped blind spot monitoring devices with housings that only perform blind spot monitoring of low-speed vehicles; the structure of the housing is not limited here. Low-speed vehicles include, but are not limited to, two-wheeled vehicles (such as motorcycles, electric vehicles, and bicycles), tricycles, and balance scooters. It should be understood that the circuit board must have a power supply module for voltage conversion and regulation. The blind spot monitoring device can be powered by its own battery, in which case the power supply module is connected to the battery; alternatively, it can utilize the power supply inside the low-speed vehicle, in which case the power supply module is connected to the power supply terminal inside the low-speed vehicle. The power supply method is not limited here.

[0029] like Figure 2 As shown, the control module 11 includes an MCU U1, a first resistor R1, and peripheral circuits 112. The power supply pins of the MCU U1 (including VBAT, VDDA, VDD_1, VDD_2, and VDD_3) are connected to the first power supply terminal (providing a first voltage of +3V3), and the ground pins of the MCU U1 (including VSSA, VSS_1, VSS_2, and VSS_3) are grounded. The PD0-OSC_IN, PD1-OSC_OUT, and NRST pins of the MCU U1 are all connected to the peripheral circuits 112. The PA3 pin of the MCU U1 is connected to the DC power supply terminal (providing the DC voltage VDC_MCU of the MCU). The PB0 and PB1 pins of the MCU U1 are both connected to the alarm module 14, and the PB2 pin of the MCU U1 is grounded through the first resistor. The PB10, PB11, and PB12 pins of the MCU U1 are all connected to the signal module 13. The PA11 and PA12 pins of the MCU U1 are both connected to the communication module 12.

[0030] The preferred MCU model is STM32F103, used for data acquisition, control, transmission, and alarm functions. Specifically, the radar collects distance data to objects within a preset range and outputs distance signals (RS485_TX and RS485_RX signals) to pins PB10 and PB11 of the MCU via signal module 13. The EN signal is the enable signal. The MCU determines whether the object is within a preset blind zone based on the distance signals. The radar distinguishes between left and right, and corresponding left / right markings are displayed in the distance signals. If the object is within the blind zone, valid alarm signals (LED1 and LED2 signals) are output from pins PB0 and PB1 to control the alarm module 14 to sound an alarm; otherwise, the alarm signals are invalid. Pins PA11 and PA12 of the MCU can also output communication signals (CAN_TX and CAN_RX signals) to communication module 12, enabling communication handshake protocols with external host terminals or upper-level computers.

[0031] The peripheral circuit 112 is used to provide the MCU with the clock signals (OSC_IN and OSC_OUT signals) and the reset signal NRST (power-on reset). The peripheral circuit 112 includes a crystal oscillator Y, a second resistor R2, a third resistor R3, a first capacitor C1, a second capacitor C2, and a third capacitor C3; pin 1 of the crystal oscillator Y is connected to one end of the second resistor R2, one end of the first capacitor C1, and the PD0-OSC_IN pin of the MCU U1; pin 3 of the crystal oscillator Y is connected to the other end of the second resistor R2, one end of the second capacitor C2, and the PD1-OSC_OUT pin of the MCU U1; the other end of the first capacitor C1 is grounded; pin 2 of the crystal oscillator Y is connected to the other end of the second capacitor C2 and ground; pin 4 of the crystal oscillator Y is grounded; one end of the third resistor R3 is connected to the first power supply terminal; the other end of the third resistor R3 is connected to one end of the third capacitor C3 and the NRST pin of the MCU; the other end of the third capacitor C3 is grounded.

[0032] like Figure 3 As shown, the communication module 12 includes a communication chip U2, a filter T, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, a fifth capacitor C5, and an electrostatic discharge protector DL; the TXD pin of the communication chip U2 is connected to the PA12 pin of the MCU U1, and the RXD pin of the communication chip U2 is connected to the MCU... Pin PA11 of U1 and GND of communication chip U2 are grounded. VCC of communication chip U2 is connected to the first power supply terminal. CANL of communication chip U2 is connected to pin 4 of filter T and one end of the fourth resistor R4. CANH of communication chip U2 is connected to pin 3 of filter T and one end of the fifth resistor R5. Pin 1 of filter T is connected to the other end of the fourth resistor R4, one end of the sixth resistor R6, one end of the fifth capacitor C5, pin 1 of electrostatic discharge device DL, and the CAN bus. Pin 2 of filter T is connected to the other end of the fifth resistor R5, the other end of the sixth resistor R6, one end of the fourth capacitor C4, pin 2 of electrostatic discharge device DL, and the CAN bus. The other ends of the fourth capacitor C4, the other ends of the fifth capacitor C5, and pin 3 of electrostatic discharge device DL are all grounded.

[0033] The communication chip U2 is preferably a high-speed CAN transceiver of model SN65HVD232DR. The filter T is preferably a two-channel common-mode filter of model SDCW2012-2-121TF. The electrostatic discharge protector DL ​​is preferably a 24V two-channel bidirectional ESD protector of model LR1CANLT1G. The two communication signals (CAN_TX and CAN_RX signals) output by the MCU are processed by the communication chip U2, filtered by filters T, C4, and C5, and then output as CANL and CANH signals, which are transmitted to an external host computer for display or control of other devices via the CAN bus. R4, R5, and R6 are used for impedance matching.

[0034] Preferably, the communication module 12 further includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a sixth capacitor C6, and a seventh capacitor C7; one end of the seventh resistor R7 is connected to the TXD pin of the communication chip U2, one end of the eighth resistor R8, and one end of the sixth capacitor C6; the other end of the seventh resistor R7 is connected to the first power supply terminal, the other end of the sixth capacitor C6 is connected to the GND pin of the communication chip U2 and ground, the other end of the eighth resistor R8 is connected to the PA12 pin of the MCU U1, one end of the ninth resistor R9 is connected to the RXD pin of the communication chip U2, the other end of the ninth resistor R9 is connected to one end of the seventh capacitor C7 and the PA11 pin of the MCU U1, and the other end of the seventh capacitor C7 is grounded.

[0035] R7 is a pull-up resistor used to pull up the TXD pin of the communication chip U2 when there is no CAN_TX signal transmission, so as to avoid the CAN_TX signal glitches and voltage changes being mistaken for data being sent incorrectly; R8 and C6 are used to limit and filter the CAN_TX signal input to the TXD pin, and C7 and R9 are used to limit and filter the CAN_RX signal output from the RXD pin to the MCU.

[0036] like Figure 4 As shown, the signal module 13 includes interface J1, tenth resistor R10, eleventh resistor R11, and twelfth resistor R12; the TX pin of interface J1 is connected to the PB11 pin of MCU U1 through the eleventh resistor R11, the RX pin of interface J1 is connected to the PB10 pin of MCU U1 through the tenth resistor R10, the IO pin of interface J1 is connected to one end of the twelfth resistor R12 and the PB12 pin of MCU U1, the other end of the twelfth resistor R12 and the 3.3V pin of interface J1 are both connected to the first power supply terminal, and the GND pin of interface J1 is grounded.

[0037] The interface J1 is powered by an external communication power supply and transmits distance signals (RS485_TX and RS485_RX signals). The distance signal is also an RS485 signal, transmitting data at a baud rate, such as 115200 or 9600. RS485 enables long-distance signal transmission, with a transmission distance of 200-300 meters.

[0038] like Figure 5 As shown, since blind spot monitoring is required on both sides when the vehicle is traveling at low speed, the alarm module 14 is equipped with two sets of alarm circuits, specifically including a first switch Q1, a second switch Q2, a first alarm light LD1, a second alarm light LD2, a thirteenth resistor R13, and a fourteenth resistor R14. The base of the first switch Q1 is connected to the PB0 pin of the MCU U1, the collector of the first switch Q1 is connected to the negative terminal of the first alarm light LD1 through the thirteenth resistor R13, the positive terminal of the first alarm light LD1 is connected to the first power supply terminal, and the emitter of the first switch Q1 is grounded. The base of the second switch Q2 is connected to the PB1 pin of the MCU U1, the collector of the second switch Q2 is connected to the negative terminal of the second alarm light LD2 through the fourteenth resistor R14, the positive terminal of the second alarm light LD2 is connected to the first power supply terminal, and the emitter of the second switch Q2 is grounded.

[0039] In this circuit, the first switch Q1 and the second switch Q2 are preferably NPN transistors, and the first alarm lamp LD1 and the second alarm lamp LD2 are red lights. When the LED1 signal is high, the first switch Q1 is turned on, the negative terminal of the first alarm lamp LD1 is grounded to form a current loop, and the first alarm lamp LD1 is lit to provide an alarm indication. When the LED1 signal is low, the first switch Q1 is turned off, the negative terminal of the first alarm lamp LD1 is in a high impedance state, and the first alarm lamp LD1 is turned off. Under normal circumstances, the LED1 signal is a continuous low level; during an alarm, the LED1 signal is a periodic pulse waveform with alternating high and low levels, and the red light flashes to indicate an alarm. The working principle of the second switch Q2 and the LED2 signal is the same as that of the first switch Q1, and will not be described in detail here.

[0040] Preferably, the alarm module 14 further includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and an eighteenth resistor R18. One end of the fifteenth resistor R15 is connected to one end of the sixteenth resistor R16 and the base of the first switching transistor Q1, and the other end of the fifteenth resistor R15 is connected to the PB0 pin of the MCU U1. The other end of the sixteenth resistor R16 is connected to the emitter of the first switching transistor Q1 and ground. One end of the seventeenth resistor R17 is connected to one end of the eighteenth resistor R18 and the base of the second switching transistor Q2, and the other end of the seventeenth resistor R17 is connected to the PB1 pin of the MCU U1. The other end of the eighteenth resistor R18 is connected to the emitter of the second switching transistor Q2 and ground. R15 and R17 are used for current limiting protection of the connected switching transistors, and R16 and R18 are used to pull down the base voltage to avoid false triggering.

[0041] In summary, the blind spot monitoring device for low-speed vehicles provided by this utility model is specifically designed for blind spot monitoring of low-speed vehicles. It triggers an alarm when an object approaches, solving the problem of the lack of circuit modules suitable for blind spot radar monitoring of two-wheeled vehicles. The device is compact in size, with high integration of each circuit module, reducing wiring difficulty and interference, reducing material and production costs, improving production efficiency, and reducing installation and deployment labor costs.

[0042] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A blind area monitoring device for a low-speed vehicle, comprising a housing, a radar for collecting distances of objects within a preset range and a circuit board arranged in the housing, characterized in that, The circuit board integrates a control module, a communication module, a signal module, and an alarm module; the control module is connected to the communication module, the signal module, and the alarm module; the signal module is connected to the radar. The signal module transmits the distance signal collected by the radar to the control module. When the control module determines that the object is within the preset blind zone based on the distance signal, it outputs a valid alarm signal to control the alarm module to flash the alarm.

2. The blind spot monitoring device for low-speed vehicles according to claim 1, characterized in that, The control module includes an MCU, a first resistor, and peripheral circuitry. The MCU's power supply pin is connected to the first power supply terminal, and the MCU's ground pin is grounded. The MCU's PD0-OSC_IN, PD1-OSC_OUT, and NRST pins are all connected to the peripheral circuitry. The MCU's PA3 pin is connected to the DC power supply terminal. The MCU's PB0 and PB1 pins are both connected to the alarm module, and the MCU's PB2 pin is grounded through the first resistor. The MCU's PB10, PB11, and PB12 pins are all connected to the signal module. The MCU's PA11 and PA12 pins are both connected to the communication module.

3. The blind spot monitoring device for low-speed vehicles according to claim 2, characterized in that, The peripheral circuit includes a crystal oscillator, a second resistor, a third resistor, a first capacitor, a second capacitor, and a third capacitor; The first pin of the crystal oscillator is connected to one end of the second resistor, one end of the first capacitor, and the PD0-OSC_IN pin of the MCU; the third pin of the crystal oscillator is connected to the other end of the second resistor, one end of the second capacitor, and the PD1-OSC_OUT pin of the MCU; the other end of the first capacitor is grounded; the second pin of the crystal oscillator is connected to the other end of the second capacitor and ground; the fourth pin of the crystal oscillator is grounded; one end of the third resistor is connected to the first power supply terminal; the other end of the third resistor is connected to one end of the third capacitor and the NRST pin of the MCU; and the other end of the third capacitor is grounded.

4. The blind spot monitoring device for low-speed vehicles according to claim 2, characterized in that, The communication module includes a communication chip, a filter, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, a fifth capacitor, and an electrostatic discharge protector; The TXD pin of the communication chip is connected to the PA12 pin of the MCU, the RXD pin of the communication chip is connected to the PA11 pin of the MCU, the GND pin of the communication chip is grounded, the VCC pin of the communication chip is connected to the first power supply terminal, the CANL pin of the communication chip is connected to the 4th pin of the filter and one end of the fourth resistor, and the CANH pin of the communication chip is connected to the 3rd pin of the filter and one end of the fifth resistor; the 1st pin of the filter is connected to the other end of the fourth resistor, one end of the sixth resistor, one end of the fifth capacitor, the 1st pin of the electrostatic discharge device, and the CAN bus; the 2nd pin of the filter is connected to the other end of the fifth resistor, the other end of the sixth resistor, one end of the fourth capacitor, the 2nd pin of the electrostatic discharge device, and the CAN bus; the other ends of the fourth capacitor, the other ends of the fifth capacitor, and the 3rd pin of the electrostatic discharge device are all grounded.

5. The blind spot monitoring device for low-speed vehicles according to claim 4, characterized in that, The communication module also includes a seventh resistor, an eighth resistor, a ninth resistor, a sixth capacitor, and a seventh capacitor; One end of the seventh resistor is connected to the TXD pin of the communication chip, one end of the eighth resistor, and one end of the sixth capacitor; The other end of the seventh resistor is connected to the first power supply terminal, the other end of the sixth capacitor is connected to the GND pin of the communication chip and ground, the other end of the eighth resistor is connected to the PA12 pin of the MCU, one end of the ninth resistor is connected to the RXD pin of the communication chip, the other end of the ninth resistor is connected to one end of the seventh capacitor and the PA11 pin of the MCU, and the other end of the seventh capacitor is grounded.

6. The blind spot monitoring device for low-speed vehicles according to claim 2, characterized in that, The signal module includes an interface, a tenth resistor, an eleventh resistor, and a twelfth resistor; The TX pin of the interface is connected to the PB11 pin of the MCU through the eleventh resistor, the RX pin of the interface is connected to the PB10 pin of the MCU through the tenth resistor, the IO pin of the interface is connected to one end of the twelfth resistor and the PB12 pin of the MCU, the other end of the twelfth resistor and the 3.3V pin of the interface are both connected to the first power supply terminal, and the GND pin of the interface is grounded.

7. The blind spot monitoring device for low-speed vehicles according to claim 2, characterized in that, The alarm module includes a first switching transistor, a second switching transistor, a first alarm light, a second alarm light, a thirteenth resistor, and a fourteenth resistor; The base of the first switching transistor is connected to the PB0 pin of the MCU. The collector of the first switching transistor is connected to the negative terminal of the first alarm lamp through the thirteenth resistor. The positive terminal of the first alarm lamp is connected to the first power supply terminal. The emitter of the first switching transistor is grounded. The base of the second switching transistor is connected to the PB1 pin of the MCU. The collector of the second switching transistor is connected to the negative terminal of the second alarm lamp through the fourteenth resistor. The positive terminal of the second alarm lamp is connected to the first power supply terminal. The emitter of the second switching transistor is grounded.

8. The blind spot monitoring device for low-speed vehicles according to claim 7, characterized in that, The alarm module also includes a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, and an eighteenth resistor; One end of the fifteenth resistor is connected to one end of the sixteenth resistor and the base of the first switch. The other end of the fifteenth resistor is connected to the PB0 pin of the MCU. The other end of the sixteenth resistor is connected to the emitter of the first switch and ground. One end of the seventeenth resistor is connected to one end of the eighteenth resistor and the base of the second switch. The other end of the seventeenth resistor is connected to the PB1 pin of the MCU. The other end of the eighteenth resistor is connected to the emitter of the second switch and ground.

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