Dual-mode Bluetooth electric mower instrument

Abstract

The utility model provides a dual-mode Bluetooth electric mower instrument, which comprises a shell, a liquid crystal screen and an internal circuit module, and realizes intelligent interaction and high-efficiency management by integrating an MCU (Microprogrammed Control Unit) control chip, a dual-mode Bluetooth module, CAN (Controller Area Network) bus communication, a quiescent current control circuit and a data storage circuit. The instrument displays the operation state in real time through a liquid crystal screen, supports Bluetooth connection with mobile equipment for remote control, and cooperates with other ECUs of the electric mower through a CAN bus. The quiescent current control circuit reduces the standby power consumption to a microampere level, and the EEPROM stores key data to ensure that the key data are not lost in power failure. The instrument solves the problems that traditional equipment is poor in interactivity and high in power consumption, and is suitable for household and commercial electric mowers.

Description

Technical Field

[0001] This utility model relates to the field of electric lawnmower instrument technology, and in particular to a dual-mode Bluetooth electric lawnmower instrument. Background Technology

[0002] With increasing environmental awareness and advancements in battery technology, electric lawnmowers are gradually replacing traditional fuel-powered lawnmowers, becoming the mainstream equipment for both home and commercial lawn maintenance. Electric lawnmowers offer advantages such as low noise, zero emissions, and easy maintenance, but their level of intelligence and user experience still has room for improvement. Currently, the instruments on electric lawnmowers mainly provide basic information displays, such as battery level, operating status, and fault indications, but still suffer from the following problems: For example, information display is limited; most instruments only use LED indicator lights or simple LCD screens, failing to intuitively display complex data; interactivity is poor, making it difficult for users to set parameters or switch modes directly from the instrument, requiring reliance on physical buttons or additional remote control devices; intelligence is insufficient, lacking real-time data interaction with mobile terminals, making remote monitoring and historical data analysis impossible; and environmental adaptability is weak, with traditional instruments exhibiting poor visibility and durability in strong light or humid environments, impacting user experience.

[0003] Chinese patent document CN115039560B discloses an electrical control system for an electric lawnmower based on CAN bus. Based on CAN bus technology, the electrical control system includes an energy control module, an instrument display module, a walking control module, a mowing control module, and a sensor module. The CAN module and its interface complete signal acquisition, reception, parsing, processing, and transmission, improving the integration and information processing efficiency of the electric lawnmower. The instrument display module displays the overall system operating status and key fault information, and performs alarm processing. However, the instrument display module described in the above technical solution focuses on basic information display (such as battery level and fault codes) and does not mention intelligent interaction (such as Bluetooth connection to mobile devices). Summary of the Invention

[0004] This utility model proposes an instrument for electric lawnmowers. Through the design of control circuits, Bluetooth module circuits, static current control circuits, data storage circuits, and CAN circuits, it aims to solve the problems of insufficient intelligent interaction in traditional electric lawnmower instruments and excessive power consumption when using classic Bluetooth alone. It is suitable for application scenarios that require a balance between the richness of functions and power consumption control of electric lawnmowers.

[0005] To achieve the above objectives, this utility model proposes a dual-mode Bluetooth electric lawnmower instrument, including a housing and an LCD screen mounted on the housing. The housing contains a control circuit and a Bluetooth module circuit. The control circuit has an MCU control chip. The Bluetooth module circuit is connected to the MCU control chip. The MCU control chip is connected to a static current control circuit, a data storage circuit, and a CAN circuit. The static current control circuit is connected to the main power supply circuit.

[0006] The MCU control chip is Huada HC32L072JA. As the main control chip, Huada HC32L072JA communicates with other devices via the CAN bus to receive or send data; drives the LCD screen: controls the displayed content (such as current speed, current battery level, and load value) through the I2C interface; in addition, the main control chip can process user commands received by the Bluetooth module and control the motor to perform corresponding functions.

[0007] Preferably, the Bluetooth module circuit includes a dual-mode Bluetooth chip. Pin PB0 of the dual-mode Bluetooth chip is connected to resistor R29, and pin PB1 is connected to resistor R30. The other ends of resistors R29 and R30 are respectively connected to the control chip. Pins PB0 and PB1 are respectively connected to pull-up resistors R64 and R63. Pins PB0 and PB1 are respectively connected to the program writing interface circuit.

[0008] The dual-mode Bluetooth chip supports the coexistence of high bandwidth and low power consumption scenarios. Classic Bluetooth enables the transmission of high-quality audio, while BLE Bluetooth maintains low-power mobile APP connectivity, enhancing multi-device collaboration capabilities and optimizing the user experience. The automatic switching of dual-mode Bluetooth improves the rapid response capability and stability of the electric lawnmower.

[0009] Preferably, the static current control circuit includes transistors 0Q1 and 0Q2. The emitter of transistor 0Q1 is grounded, the base of transistor 0Q1 is connected to the control circuit, the collector of transistor 0Q1 is connected to resistor OR3, and the other end of resistor OR3 is connected to the base of transistor 0Q2. The emitter of transistor 0Q2 is connected to the power supply, and the collector of transistor 0Q2 is connected to capacitor OC1.

[0010] The static current control circuit can maintain some functions (such as receiving Bluetooth signals) while the electric lawnmower is in standby mode and can extend the battery life of the electric lawnmower when it is idle.

[0011] Preferably, the electric lawnmower instrument also includes a headlight control signal circuit, which is connected to the MCU control chip.

[0012] Preferably, the headlight control signal circuit includes a transistor 5Q6, with the emitter of the transistor 5Q6 grounded, the base of the transistor 5Q6 connected to a resistor 5R30, and the collector of the transistor 5Q6 connected to a power supply and an MCU control chip.

[0013] The headlight control signal circuit illuminates the high beam indicator when the HB_IN pin is continuously at >= 1.65V for 100 milliseconds (i.e., the high beam signal is >= 7.0V).

[0014] Preferably, the CAN circuit converts the TTL level signal of the MCU control chip into a differential signal of the CAN bus through a CAN transceiver chip. Specifically, it includes a CAN transceiver chip and a TVS2 diode. The CAN transceiver chip processes the MCU control chip level signal after it has been filtered by a filter capacitor. The TVS2 diode is connected to the CAN bus terminating resistor and the filter capacitor, with a common-mode inductor L2 in between to suppress bus noise. The TXD, RXD, and STB pins of the CAN transceiver chip are respectively connected to the MCU control chip.

[0015] The CAN circuit enables efficient and reliable communication between the instrument and other electronic control units, and completes real-time data interaction and display.

[0016] Preferably, the instrument power-on detection circuit includes a transistor 2Q1, the emitter of which is grounded, the base of which is connected to a resistor 2R4, and the collector of which is connected to the power supply and the MCU control chip.

[0017] The instrument power-on detection circuit is a key component in ensuring the safe startup and reliable operation of the equipment. Its core function is to automatically complete hardware self-tests when the system is powered on, ensuring that the instrument and its associated modules are in normal condition.

[0018] Preferably, the electric lawnmower instrument also includes a data storage circuit, which is connected to the control chip.

[0019] Preferably, the data storage circuit includes an EEPROM chip, with pins A0, A1, and A2 of the EEPROM chip grounded, pins SCL and SDA connected to the control chip respectively, pin VCC1 connected to the power supply and filter capacitors C2 and C21, and write protection pin WP grounded.

[0020] The data storage circuit is responsible for the persistent storage of critical data, ensuring that historical information, configuration parameters and operating status of the device are not lost after power failure, while also supporting the functional expansion and subsequent maintenance of the device.

[0021] Preferably, the LCD screen on the housing includes a backlight indicator circuit and an LCD driving and display circuit. The backlight indicator circuit is connected to the MCU control chip and includes multiple LED indicators. The LCD driving and display circuit includes an HT16C23_64LQFP-A chip, whose pins SDA and SCL are connected to resistors R27 and R28 respectively. The other ends of resistors R27 and R28 are connected to the control chip respectively.

[0022] Compared with existing technologies, the beneficial effects achieved by this utility model are as follows: By integrating an MCU control chip (Huada HC32L072JA), a dual-mode Bluetooth module, CAN bus communication, a static current control circuit, and a data storage circuit, intelligent interaction and high-efficiency management are realized. The instrument displays the operating status (speed, power, load, etc.) in real time on an LCD screen, supports remote control via Bluetooth connection to mobile devices, and works collaboratively with other ECUs (such as the motor controller) of the electric lawnmower via the CAN bus. The static current control circuit reduces standby power consumption to the microampere level, and EEPROM stores key data to ensure that it is not lost when power is off. This instrument solves the problems of poor interactivity and high power consumption of traditional equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal circuit structure of Embodiment 1 of this utility model.

[0024] Figure 2 This is the liquid crystal driving and display circuit of Embodiment 1 of this utility model.

[0025] Figure 3 This is the backlight indicator circuit of Embodiment 1 of this utility model.

[0026] Figure 4 This is the control circuit of Embodiment 2 of this utility model.

[0027] Figure 5 This is the Bluetooth module circuit of Embodiment 2 of this utility model.

[0028] Figure 6 This is the static current control circuit of Embodiment 2 of this utility model.

[0029] Figure 7 This is the main power supply circuit of Embodiment 2 of this utility model.

[0030] Figure 8 This is the CAN circuit of Embodiment 2 of this utility model.

[0031] Figure 9 This is the instrument power-on detection circuit of Embodiment 2 of this utility model.

[0032] Figure 10This is the data storage circuit of Embodiment 2 of this utility model.

[0033] Figure 11 This is the headlight control signal circuit of Embodiment 2 of this utility model.

[0034] Figure 12 These are six switching circuits according to Embodiment 2 of this utility model. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only one preferred embodiment of this utility model and are only used to explain the technical solutions of this utility model. They do not limit the scope of protection of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] Example 1

[0037] The internal circuit structure diagram of Embodiment 1 of this utility model is shown below. Figure 1 As shown: The entire electric lawnmower instrument panel mainly revolves around the control circuit. The MCU control chip in the control circuit is connected to the instrument's power-on detection circuit, CAN circuit, static current control circuit, Bluetooth module circuit, headlight control signal circuit, data storage circuit, and LCD driver and display circuit. Among them, the static current control circuit is connected to the main power supply circuit, and the data signal is transmitted to the MCU control chip through the CAN bus provided by the CAN circuit. The MCU control chip controls the display of the LCD driver and display circuit through the I2C interface, and at the same time controls the on / off state of the backlight indicator circuit. The operating voltage range of the control circuit is 0-5V.

[0038] LCD driving and display circuits such as Figure 2 As shown, the device includes a chip (model HT16C23_64LQFP-A). One end of resistor R0 is connected to a +5V power supply, and the other end is connected to the VLCD pin of the chip. The chip's SDA and SCL pins use an I2C interface and are connected to the MCU control chip through the resistor. The chip receives signals transmitted by the MCU control chip and controls the display status of the LCD screen, thus realizing the function of the MCU control chip controlling the LCD screen and displaying the status of the electric lawnmower in real time, which greatly optimizes the user experience.

[0039] The LCD screen is connected to the COM and SEG pins of the chip (model HT16C23_64LQFP-A) in the LCD driver and display circuit. The function indicator lights on the screen will light up when the corresponding function is used, including Bluetooth module, power, high beam, standby, etc. The screen can also display the real-time operating status of the electric lawnmower, including current speed, current battery level, load value, etc.

[0040] The instrument panel of the electric lawnmower includes multiple backlight indicator circuits, one type of which is as follows: Figure 3 As shown, +5V is the main power input, providing the operating voltage for the LED module, which includes multiple LED indicators. Each indicator corresponds to a different function (such as power, Bluetooth, fault, etc.). Each LED indicator is connected in series with a current-limiting resistor to control the current within 5-20mA to avoid overcurrent damage. The LED_OUT1 interface receives signals from the MCU control chip and controls the on / off state of the LED indicator through resistors and transistors.

[0041] The indicator light circuit, through MCU control and current limiting protection design, achieves multi-functional status display and low-power operation.

[0042] Example 2

[0043] like Figure 4 As shown, the control circuit of Embodiment 2 of this utility model includes an MCU control chip, model number Huada HC32L072JA, which serves as the main control MCU. Its main functions are: processing signals transmitted by the data processing circuit; communicating with other devices via the CAN bus (including receiving data); driving the LCD screen; controlling the content displayed on the LCD screen (such as current speed, current battery level, and load value) via the I2C interface; and connecting to the Bluetooth module circuit via the UART interface. The Bluetooth module circuit transmits raw data via the UART interface. The MCU control chip receives and parses instructions through a pre-set program (which can be programmed via the program instruction interface) and sends instructions to each module via the CAN bus.

[0044] In the control circuit, capacitors C25 and C26 are connected to the XTHI and XTHO pins of the MCU control chip, respectively; one end of resistor R21 is connected to the +5V power supply, and the other end is connected to the RESETB pin of the MCU control chip; capacitors C8 and C29 are both connected to the VCAP pin of the MCU control chip; at the program writing interface, resistors R51 and R52 are connected to the SWCLK and SWDIO pins of the MCU control chip, respectively.

[0045] Specifically, the various module circuits connected to the MCU control chip in the control circuit are as follows:

[0046] like Figure 5As shown, the Bluetooth module circuit includes a dual-mode Bluetooth chip, integrating Classic Bluetooth and BLE Bluetooth. Classic Bluetooth is used for high-speed data transmission (such as audio transmission or firmware upgrades), while BLE Bluetooth is used for low-power scenarios (such as real-time monitoring of the lawnmower status by a mobile app). The dual-mode Bluetooth chip's VBAT pin is connected to a 4.3V regulated power supply, with a filter capacitor C17 added to suppress power supply noise. The dual-mode Bluetooth chip's PB1 pin is connected to the MCU control chip to receive Bluetooth data and is connected to a pull-up resistor R63 to ensure signal stability. The dual-mode Bluetooth chip's PB0 pin is connected to the MCU control chip to send data to Bluetooth and is connected to a pull-up resistor R64 to enhance drive capability. Simultaneously, the dual-mode Bluetooth chip connects to a programmable interface (such as...) via pins PB1 and PB0. Figure 4 As shown), it is used for firmware updates or configuration writing; capacitor C08 is connected to the BT_OSCO pin of the dual-mode Bluetooth chip, and capacitor C09 is connected to the BT_OSCI pin of the dual-mode Bluetooth chip.

[0047] The process of receiving data using a Bluetooth module during the operation of an electric lawnmower is as follows:

[0048] The mobile device sends a command -> the Bluetooth module transmits it to the MCU via UART -> the MCU parses the command and controls the motor.

[0049] The data transmission process using the Bluetooth module during the operation of an electric lawnmower is as follows:

[0050] The MCU sends AT commands or custom protocol data (such as lawnmower speed commands) via UART -> the Bluetooth module wirelessly transmits the data to a mobile app or other mobile devices for display.

[0051] The Bluetooth module circuit, through dual-mode chip and hardware reuse design, realizes wireless control and data interaction of the lawnmower instrument, and has three major characteristics: low power consumption, high reliability and easy maintenance.

[0052] like Figure 6 As shown, the static current control circuit is connected to the main power supply circuit with an input voltage of 5V. The common terminal of capacitors 0C1 to 0C5 is grounded to ensure a low-impedance connection and reduce noise. A diode 0D1 is connected between VDD1+5V and VDD+4.3V to prevent reverse power connection or power path switching. Resistor 0R2 is connected to the MCU control chip and receives the power status monitoring signal to confirm power stability. The emitter of transistor 0Q1 is grounded, the base of transistor 0Q1 is connected to the MCU control chip, the collector of transistor 0Q1 is connected to resistor 0R3, and the other end of resistor 0R3 is connected to the base of transistor 0Q2. The emitter of transistor 0Q2 is connected to the power supply, and the collector of transistor 0Q2 is connected to capacitor 0C1. Both are used to control the logic input.

[0053] When the lawnmower is idle, the MCU cuts off the power to non-essential modules (such as screen backlight and CAN transceiver) through 0Q1 / 0Q2, leaving only the MCU and wake-up circuit powered (by VDD+4.3V). At this time, the static current of the whole machine can be reduced to the microampere level.

[0054] Power to the entire system can be restored by triggering 0R1 / 0R2 to reconnect via button press, CAN signal, or timer interrupt.

[0055] like Figure 7 As shown, the headlight control signal circuit is connected to the main power supply circuit with an input voltage of 5V. Resistors 5R26 to 5R32 are current-limiting resistors used for signal conditioning. One end of resistor 5R32 is connected to the MCU control chip as a high-side drive input, receiving signals transmitted by the MCU control chip to control the on / off state of the headlight power supply. The emitter of transistor 5Q6 is grounded, the base of transistor 5Q6 is connected to resistor 5R30, and the collector of transistor 5Q6 is connected to the power supply and the MCU control chip.

[0056] When HBN is >= 1.65V for 100 milliseconds (i.e., high beam signal >= 7.0V), the high beam indicator light will illuminate.

[0057] like Figure 8 As shown, the CAN circuit includes a CAN transceiver U9, powered by VDD1 +5V and +5V. High-frequency noise is filtered out by ferrite beads FB1 and FB2, decoupling capacitors C9 and C10. The CAN transceiver is connected to the MCU main control chip through pins TXD and RXD. Pins CANL and CANH are connected to other CAN nodes through differential signal lines. Resistors R7 and R8 are used to provide impedance. TVS2 is connected between CANH and CANL to suppress surges and ESD. Pin STB is used to control the transceiver to sleep.

[0058] The CAN circuit is the core module for enabling reliable communication between the instrument cluster and other electronic control units in the vehicle (such as the motor controller and battery management system, BMS). For example, the BMS sends SOC data via the CAN bus, which is then parsed by the instrument cluster MCU to control the LCD screen to display the battery percentage.

[0059] like Figure 9As shown, the instrument power-on detection circuit is connected to the MCU control chip through resistors 2R8 and 2R10. IGN(+) is the ignition signal input. When IGN(+) is greater than 6V for 200ms, the instrument powers on. BATT(+) is the constant power input, used to maintain the real-time clock or memory function. Diodes 2D1 and 2D2 are used to prevent reverse power connection and protect subsequent circuits. Capacitor 2C3 is used to clear transient interference on the IGN(+) line. The emitter of transistor 2Q1 is grounded, the base of transistor 2Q1 is connected to resistor 2R4, and the collector of transistor 2Q1 is connected to the power supply and the MCU control chip.

[0060] The instrument power-on detection circuit is a key module to ensure safe system startup. Its core function is to monitor power input conditions and activate the instrument when a preset threshold is met. The normal system startup process is as follows:

[0061] The user turns on the lawnmower key switch → IGN(+) voltage rises to 12V → MCU detects a valid signal → screen and CAN communication are activated.

[0062] like Figure 10 As shown, the data storage circuit is connected to the MCU control chip in the control circuit. The main core component is an EEPROM memory chip. On one end, the three device address configuration pins (A0, A1, A2) and the ground pin GND are all grounded. On the other end, the pins SCL and SDA are connected to the MCU control chip via an I2C bus. The I2C bus is equipped with pull-up resistors R18 and R18; the VCC1 pin is connected to power supply filter capacitors C2 and C21; the write protection pin WP is connected to a low level to indicate that writing is allowed.

[0063] Data storage circuits are mainly used to save key operating parameters, user configurations, and fault logs, ensuring that data is not lost after a power outage. Typical application scenarios are as follows:

[0064] Power-on initialization: The MCU reads the user's last settings (such as timer schedules) from the EEPROM and automatically resumes its working state.

[0065] like Figure 11 As shown, the main power supply circuit includes a chip (model SCT2A25STE). Pin VIN is connected to the input power supply, where BATT(+) serves as the main input power supply and IGN(+) is the ignition signal. Diodes 1D1 and 1D2 are connected in series between the power supply and the chip to prevent reverse connection and protect the circuit. Pin FB is connected to resistor 1R4, with the other end of resistor 1R4 grounded. Pin BST is connected to capacitor 1C6, with the other end of capacitor 1C6 connected to pin SW and inductor 1L1. It can achieve multiple voltage outputs: +5V supplies power to CAN transceivers, sensors, display backlights, etc., and +3.3V supplies power to low-power devices such as MCUs and Bluetooth modules.

[0066] The main power supply circuit achieves wide voltage input, low power consumption management, and high reliability power supply through multi-stage voltage regulation and intelligent enable control, meeting the stringent environmental requirements of electric lawnmower instruments.

[0067] like Figure 12 As shown, all six switch circuits are connected to the MCU control chip. +5V provides the working voltage for the button circuit, which is taken from the regulated output of the self-powered circuit. Buttons (KEY1-KEY6): are mechanical tactile switches used for user input (such as power on / mode switching). Resistors 9R1, 9R3, 9R5, 9R7, 9R9, and 9R11 are all pull-up resistors, which keep the signal lines at a high level. Resistors 9R2, 9R4, 9R6, 9R8, 9R10, and 9R12 prevent overcurrent on the GPIO pins of the MCU control chip when the buttons are pressed. Filter capacitors (9C1-9C6): are connected in parallel across the buttons to eliminate noise caused by button bounce.

[0068] The interfaces (KEY1-KEY6) are connected to the GPIO pins of the MCU and configured as input mode (internal or external pull-up resistors). When the button is not pressed, the interfaces (KEY1-KEY6) are kept at a high level (5V or 3.3V) through the internal pull-up resistors of the MCU. When the button is pressed, the interfaces (KEY1-KEY6) are pulled low to GND, and the MCU control chip detects the low level and triggers an action.

[0069] The electric lawnmower instrument of this utility model includes a housing, an LCD screen and an internal circuit module. By integrating an MCU control chip (Huada HC32L072JA), a dual-mode Bluetooth module, a CAN bus communication, a static current control circuit and a data storage circuit, it realizes intelligent interaction and high-efficiency management.

[0070] Intelligent Interaction: Dual-mode Bluetooth (Classic + BLE) supports high-speed data transmission and low-power connection, allowing users to monitor and control the electric lawnmower in real time via a mobile app or other mobile devices; the LCD screen intuitively displays complex data (such as battery percentage and fault codes), which is superior to traditional LED indicator lights.

[0071] High-efficiency energy management: The static current control circuit reduces the standby current to the microampere level, significantly extending battery life; the multi-level power supply design (5V / 3.3V) optimizes energy distribution and supports wide voltage input (9V-36V).

[0072] High-reliability communication: The CAN bus enables real-time data interaction with the motor controller and BMS, with strong anti-interference capabilities (TVS tube + ferrite bead filter); the data storage circuit (EEPROM) saves user configuration and fault logs, which are not lost when power is off.

[0073] Environmental adaptability: The headlight control circuit remains clearly visible even under strong light.

[0074] Modular expansion: OTA upgrades are possible via Bluetooth, ensuring compatibility with future feature expansions (such as GPS module integration).

[0075] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. It should be noted that for those skilled in the art, any changes or substitutions that can be easily conceived without departing from the technical principle of the present invention should be included within the protection scope of the present utility model.

Claims

1. A dual-mode Bluetooth electric lawnmower instrument, characterized in that, The device includes a housing and an LCD screen mounted on the housing. The housing contains a control circuit and a Bluetooth module circuit. The control circuit has an MCU control chip. The Bluetooth module circuit is connected to the MCU control chip. The MCU control chip is connected to a static current control circuit, a data storage circuit, and a CAN circuit. The static current control circuit is connected to the main power supply circuit.

2. The dual-mode Bluetooth electric lawnmower instrument according to claim 1, characterized in that, The Bluetooth module circuit includes a dual-mode Bluetooth chip. Pin PB0 of the dual-mode Bluetooth chip is connected to resistor R29, and pin PB1 is connected to resistor R30. The other ends of resistors R29 and R30 are respectively connected to the control chip. Pins PB0 and PB1 are respectively connected to pull-up resistors R64 and R63. Pins PB0 and PB1 are respectively connected to the program writing interface circuit.

3. The dual-mode Bluetooth electric lawnmower instrument according to claim 1, characterized in that, The static current control circuit includes transistors 0Q1 and 0Q2. The emitter of transistor 0Q1 is grounded, the base of transistor 0Q1 is connected to the MCU control chip, and the collector of transistor 0Q1 is connected to resistor OR3. The other end of resistor OR3 is connected to the base of transistor 0Q2. The emitter of transistor 0Q2 is connected to the power supply, and the collector of transistor 0Q2 is connected to capacitor OC1.

4. The dual-mode Bluetooth electric lawnmower instrument according to claim 1 or 2, characterized in that, The dual-mode Bluetooth electric lawnmower instrument also includes a headlight control signal circuit, which is connected to the MCU control chip.

5. The dual-mode Bluetooth electric lawnmower instrument according to claim 4, characterized in that, The headlight control signal circuit includes a transistor 5Q6, the emitter of which is grounded, the base of which is connected to a resistor 5R30, and the collector of which is connected to the power supply and the MCU control chip.

6. The dual-mode Bluetooth electric lawnmower instrument according to claim 1 or 2, characterized in that, The CAN circuit converts the TTL level signal of the MCU control chip into a differential signal of the CAN bus through the CAN transceiver chip. It includes the CAN transceiver chip and the TVS2 diode. The pins TXD, RXD and STB of the CAN transceiver chip are connected to the MCU control chip respectively. The TVS2 diode is connected to the CAN bus terminating resistor and the filter capacitor. A common mode inductor L2 is provided in the middle to suppress bus noise.

7. The dual-mode Bluetooth electric lawnmower instrument according to claim 1 or 2, characterized in that, The instrument power-on detection circuit includes a transistor 2Q1. The emitter of the transistor 2Q1 is grounded, the base of the transistor 2Q1 is connected to a resistor 2R4, and the collector of the transistor 2Q1 is connected to the power supply and the MCU control chip.

8. The dual-mode Bluetooth electric lawnmower instrument according to claim 1 or 2, characterized in that, The dual-mode Bluetooth electric lawnmower instrument also includes a data storage circuit, which is connected to the control chip.

9. The dual-mode Bluetooth electric lawnmower instrument according to claim 8, characterized in that, The data storage circuit includes an EEPROM chip. Pins A0, A1, and A2 of the EEPROM chip are all grounded. Pins SCL and SDA are connected to the control chip, pin VCC1 is connected to the power supply and filter capacitors C2 and C21, and the write protection pin WP is grounded.

10. The dual-mode Bluetooth electric lawnmower instrument according to claim 1, characterized in that, The LCD screen on the housing includes a backlight indicator circuit and an LCD driver and display circuit. The backlight indicator circuit is connected to the MCU control chip and includes multiple LED indicators. The LCD driver and display circuit includes an HT16C23_64LQFP-A chip, whose pins SDA and SCL are connected to resistors R27 and R28 respectively. The other ends of resistors R27 and R28 are connected to the control chip respectively.

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