Smart digital instrument circuit for electric bicycles with NFC

Abstract

To achieve the above objectives, this utility model provides an NFC-enabled smart digital instrument circuit for electric bicycles, including a prompt tone module. The prompt tone module emits a prompt tone when the NFC master card and the instrument are successfully matched, or when the NFC daughter card and the instrument are successfully matched. The prompt tone module includes a voice prompt chip of model AT5040D. This application utilizes NFC to replace the traditional key and also has NFC information learning capabilities, allowing multiple NFC-enabled devices to learn the NFC function. By adding NFC functionality and voice prompts to the instrument, it helps customers better complete the NFC card learning process, thus avoiding the problem of users being unable to unlock the electric bicycle due to uncertainty about whether the learning process has been successful.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle instrument panels, specifically to a smart digital instrument panel circuit for electric bicycles with NFC. Background Technology

[0002] Currently, the mainstream products of electric vehicle instrument panels have evolved from simple LED indicator lights to full-color LCD or TFT smart screens, which can display more information, such as left turn, right turn, headlights, backlight, reversing, fog lights, speed, etc., making them more intelligent and aesthetically pleasing. However, their unlocking methods still mainly use mechanical keys or remote keys. Traditional mechanical keys have disadvantages such as being inconvenient to carry, easy to lose, and the keyhole is easily damaged, while remote keys have a limited number of uses due to battery limitations and also require battery replacement.

[0003] Currently, some electric bicycles use NFC card swiping to unlock them. The electric bicycles are equipped with an NFC master card when they leave the factory. The NFC master card records the unlocking information of the electric bicycle. After purchasing, the user swipes the master card on the instrument panel, and then uses other NFC-enabled daughter cards to learn and record the unlocking information of the electric bicycle, so as to achieve the effect of unlocking directly with the NFC daughter cards.

[0004] However, currently there are no prompts during the NFC daughter card learning process. Information is usually transmitted directly or with a delay. Users are not clear whether the NFC mother card has been successfully recognized or whether the NFC daughter card has been successfully learned. This may lead to the problem that the NFC daughter card may not have completed the learning process and therefore cannot unlock the electric vehicle. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an intelligent digital instrument circuit for electric bicycles with NFC, which solves the problem that there is no prompt during the learning of existing NFC daughter cards, which makes users unclear whether the learning has been successful and thus unable to unlock the electric bicycle.

[0006] To achieve the above objectives, this utility model provides an NFC-enabled smart digital instrument circuit for electric bicycles, including a prompt tone module. The prompt tone module emits a prompt tone when the NFC master card and the instrument are successfully matched, or when the NFC slave card and the instrument are successfully matched. The prompt tone module includes a voice prompt chip of model AT5040D, and further includes a thirteenth capacitor, a polarized capacitor, a twenty-eighth resistor, and a thirty-fifth resistor. The VDD pin of the voice prompt chip, one end of the thirteenth capacitor, and the positive terminal of the polarized capacitor are connected in parallel to a fourth power supply. The other end of the thirteenth capacitor and the negative terminal of the polarized capacitor are connected in parallel to ground. The RST pin of the voice prompt chip is connected to one end of the twenty-eighth resistor, and the other end of the twenty-eighth resistor is connected to a reset signal input. The DATA pin of the voice prompt chip is connected to one end of the twenty-eighth resistor, and the other end of the thirty-fifth resistor is connected to a control signal input. The PWM1 and PWM2 pins of the voice prompt chip are connected to a buzzer.

[0007] In a preferred embodiment of this utility model, it further includes an NFC communication module, an NFC master card, an NFC daughter card, and an MCU module. The NFC communication module is used to implement NFC communication and can identify the NFC master card and the NFC daughter card. The NFC master card is used to record electric bicycle unlocking information. The NFC daughter card is used to learn and record electric bicycle unlocking information. The MCU module is used to compare the electric bicycle unlocking information of the NFC master card. After successful matching, it controls the prompt tone module to issue a prompt. Then, when the NFC daughter card is successfully matched with the NFC communication module, the electric bicycle unlocking information is transmitted to the NFC daughter card, and the prompt tone module is controlled to issue a prompt.

[0008] Explanation: The MCU module uses a CW32F030C8 chip, which integrates a storage element to store the electric vehicle unlocking information (the information can be recorded at the factory).

[0009] In a preferred embodiment of this utility model, the NFC communication module includes a communication chip, on which multiple filter capacitors, a decoupling circuit, a clock circuit, and a radio frequency transceiver circuit are connected. The filter capacitors are used to filter out high-frequency noise from the power supply, the decoupling circuit is used to suppress power supply fluctuations, and the clock circuit provides a reference clock signal for the communication chip. The radio frequency transceiver circuit is used for transmitting and receiving links.

[0010] In a preferred embodiment of this utility model, the communication chip is a VRC520 chip.

[0011] In a preferred embodiment of this utility model, the filter capacitor includes a third capacitor and a tenth capacitor. One end of the third capacitor is connected in parallel with the DVDD pin of the communication chip and then connected to a first power supply, while the other end of the third capacitor is grounded. One end of the tenth capacitor is connected in parallel with the TVDD pin of the communication chip and then connected to a second power supply, while the other end of the tenth capacitor is grounded. The decoupling circuit includes a sixth capacitor, an eighth capacitor, a fourth resistor, and a ninth resistor. One end of the sixth capacitor and one end of the fourth resistor are connected in parallel and then connected to the VMID pin of the communication chip. One end of the eighth capacitor and one end of the AVDD pin of the communication chip are connected in parallel and then connected to a third power supply. The other end of the fourth resistor and... One end of the ninth resistor is connected in parallel to the RX pin of the communication chip, and the other end of the ninth resistor is connected to the RF transceiver circuit; the clock circuit includes a crystal oscillator, a first capacitor, and a fourth capacitor. One end of the first capacitor is connected in parallel with pin 3 of the crystal oscillator and then connected to the OSCOUT pin of the communication chip, and the other end of the first capacitor is grounded; one end of the fourth capacitor is connected in parallel with pin 1 of the crystal oscillator and then connected to the OSCIN pin of the communication chip, and the other end of the fourth capacitor is grounded; pins 2 and 4 of the crystal oscillator are grounded; the RF transceiver circuit includes a fifth inductor, a sixth inductor, a fifth capacitor, a fourteenth capacitor, a fifteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, and a twentieth capacitor. The system includes capacitors 1, 23, 24, and 25, resistors 10, 13, and 15. One end of the fifth inductor is connected to the TX1 pin of the communication chip, and the other end is connected in parallel with the 15th capacitor and then to one end of the 14th capacitor. The other end of the 15th capacitor is connected in parallel with one end of the 21st capacitor and then to the TVSS pin of the communication chip. One end of the 14th capacitor, one end of the 17th capacitor, and one end of the 18th capacitor are connected in parallel to one end of the 10th resistor. One end of the sixth inductor is connected to the TX2 pin of the communication chip, and the other end is connected in parallel with the other end of the 21st capacitor and then to one end of the 25th capacitor. The other end of the 25th capacitor is connected in parallel with one end of the 5th capacitor, one end of the 23rd capacitor, and one end of the 24th capacitor, and then connected to one end of the 15th resistor; the other end of the 17th capacitor is connected in parallel with the other ends of the 18th capacitor, the 23rd capacitor, and the 24th capacitor, and then connected to the TVSS pin of the communication chip; the other end of the 10th resistor and the other end of the 15th resistor are both connected to the NFC sensing area, the NFC sensing area is also connected to one end of the 13th resistor, and the other end of the 13th resistor is connected to the TVSS pin of the communication chip; the other end of the 5th capacitor is connected to the other end of the 9th resistor.

[0012] The principle and beneficial effects of the technical solution are as follows: The NFC master card is used to record the unlocking information of the electric bicycle. This information can be recorded when the electric bicycle leaves the factory. When the user uses it, the NFC master card is first placed close to the instrument panel, allowing the NFC communication module to read it. After successful reading, the information is transmitted to the MCU module. The MCU module compares the information of the NFC master card with the pre-stored information. If the information is the same, it controls the prompt tone module to issue a prompt. The prompt tone can be recorded at the factory. Then, the user removes the NFC master card and places the NFC daughter card close to the instrument panel. The MCU module transmits the unlocking information of the electric bicycle to the NFC daughter card through the NFC communication module. The NFC daughter card can be an electronic device with NFC function such as a mobile phone, wristband, or watch, or a blank NFC card. After the NFC daughter card information is successfully read and recorded, the MCU module controls the prompt tone module to issue a prompt to inform the user that the learning is successful. This application completes the reading of unlocking information for an electric scooter. Electronic devices with NFC functionality, such as mobile phones, smartwatches, and wristbands, are almost always carried. Enabling NFC unlocks the scooter, directly replacing traditional mechanical keys and remote keys, significantly reducing the probability of loss. Unlocking is quick and easy using NFC contact. These devices are also easy to charge, as NFC consumes little power and eliminates the need for battery replacements. When using an NFC card for unlocking, the card is thin enough to fit in a wallet or pocket, further reducing the probability of loss compared to traditional keys. It also offers the advantages of quick and convenient unlocking without the need for battery replacements. This application utilizes NFC to replace traditional keys and features NFC learning capabilities, allowing multiple NFC-enabled devices to learn the NFC card. A voice prompt function is added to the instrument panel to help customers better learn the NFC card, thus avoiding the problem of users being unable to unlock the scooter due to uncertainty about whether the learning process was successful. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a logic diagram of an embodiment of the NFC-enabled smart digital instrument circuit for electric bicycles.

[0015] Figure 2 This is a circuit diagram of the NFC communication module described in an embodiment of the NFC-enabled smart digital instrument circuit for electric bicycles.

[0016] Figure 3 This is a circuit diagram of the prompt sound module in an embodiment of the NFC-enabled smart digital instrument circuit for electric bicycles. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0018] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] As attached Figure 1 As shown, this utility model provides an NFC-enabled smart digital instrument circuit for electric bicycles, including an NFC communication module, an NFC master card, an NFC daughter card, and a prompt tone module. The NFC communication module is used to implement NFC communication, can identify and record the NFC master card, and can allow the NFC daughter card to learn and record. The NFC master card is used to record electric bicycle unlocking information. The NFC daughter card is used to learn and record electric bicycle unlocking information. The prompt tone module is used to emit a prompt tone when the NFC master card and the NFC communication module are successfully matched, and when the NFC daughter card and the NFC communication module are successfully matched, to assist the user in completing the NFC daughter card learning and recording.

[0022] As attached Figure 2As shown, in this embodiment, the NFC communication module includes a communication chip, which is a VRC520 chip. Multiple filter capacitors are connected to the communication chip to filter out high-frequency noise from the power supply. Specifically, the filter capacitors include a third capacitor C3 and a tenth capacitor C10. One end of the third capacitor C3 is connected in parallel with the DVDD pin of the communication chip and then connected to a first power supply; the other end of the third capacitor C3 is grounded. One end of the tenth capacitor C10 is connected in parallel with the TVDD pin of the communication chip and then connected to a second power supply; the other end of the tenth capacitor C10 is grounded. Both the third capacitor C3 and the tenth capacitor C10 are of model CL10A104M08NQNC. Both the first power supply and the second power supply are 3.3V. The 3.3V power supply is filtered by capacitors C3 and C10 to remove high-frequency noise, providing a stable DC voltage to the DVDD and TVDD pins of the communication chip, ensuring normal chip operation.

[0023] As attached Figure 2 As shown, in this embodiment, the communication chip is also connected to a decoupling circuit, which is used to suppress power fluctuations. Specifically, the decoupling circuit includes a sixth capacitor C6, an eighth capacitor C8, a fourth resistor R4, and a ninth resistor. One end of the sixth capacitor C6 and one end of the fourth resistor R4 are connected in parallel to the VMID pin of the communication chip; one end of the eighth capacitor C8 and the AVDD pin of the communication chip are connected in parallel to the third power supply; the other end of the fourth resistor R4 and one end of the ninth resistor are connected in parallel to the RX pin of the communication chip, and the other end of the ninth resistor is connected to the radio frequency transceiver circuit. The sixth capacitor C6 and the eighth capacitor C8 are both of model number CL10A104M08NQNC; the fourth resistor R4 is of model number RC0603-820Ω-F-1 / 10W; the ninth resistor is of model number RC0603-2.7KF-1 / 10W; and the third power supply uses a 3.3V power supply. The sixth capacitor C6 and the eighth capacitor C8 are used to decouple the pins of the communication chip, suppress power fluctuations, and ensure the stable operation of the internal circuits (RF and digital logic) of the communication chip. The fourth resistor R4 and the ninth resistor are used for impedance matching and current limiting to ensure signal transmission efficiency and prevent overcurrent of the chip.

[0024] As attached Figure 2As shown, in this embodiment, the communication chip is also connected to a clock circuit, which provides a reference clock signal for the communication chip. Specifically, the clock circuit includes a crystal oscillator, capacitor C1, and a fourth capacitor C4. One end of capacitor C1 is connected in parallel with pin 3 of the crystal oscillator and then connected to the OSCOUT pin of the communication chip; the other end of capacitor C1 is grounded. One end of the fourth capacitor C4 is connected in parallel with pin 1 of the crystal oscillator and then connected to the OSCIN pin of the communication chip; the other end of the fourth capacitor C4 is grounded. Pins 2 and 4 of the crystal oscillator are grounded. The crystal oscillator model is AA27120000, and both capacitors C1 and C4 are CL10A101M08NQNC. Capacitors C1 and C4 are used to decouple the pins of the communication chip locally, suppress power fluctuations, and ensure stable operation of the internal circuits (RF and digital logic) of the communication chip. Together with the crystal oscillator, they form a passive crystal oscillator circuit, providing a reference clock signal for the chip, which is essential for NFC. It forms the basis of communication timing (signal encoding, decoding, and transmission synchronization), ensuring accurate data transmission and reception and protocol interaction.

[0025] As attached Figure 2As shown, in this embodiment, the communication chip is further connected to a radio frequency transceiver circuit, which is used for the transmission and reception links. Specifically, the radio frequency transceiver circuit includes a fifth inductor L5, a sixth inductor L6, a fifth capacitor C5, a fourteenth capacitor C14, a fifteenth capacitor C15, a seventeenth capacitor C17, an eighteenth capacitor C18, a twenty-first capacitor C21, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a tenth resistor R10, a thirteenth resistor R13, and a fifteenth resistor R15. One end of the fifth inductor L5 is connected to the TX1 pin of the communication chip, and the other end is connected in parallel with the fifteenth capacitor C15. One end of the fourteenth capacitor C14 is connected; the other end of the fifteenth capacitor C15 and one end of the twenty-first capacitor C21 are connected in parallel to the TVSS pin of the communication chip; one end of the fourteenth capacitor C14, one end of the seventeenth capacitor C17, and one end of the eighteenth capacitor C18 are connected in parallel to one end of the tenth resistor R10; one end of the sixth inductor L6 is connected to the TX2 pin of the communication chip, and the other end is connected in parallel with the other end of the twenty-first capacitor C21 to one end of the twenty-fifth capacitor C25; the other end of the twenty-fifth capacitor C25 is connected in parallel with one end of the fifth capacitor C5 and one end of the twenty-third capacitor C23. One end of the 17th capacitor C17, the other end of the 18th capacitor C18, the other end of the 23rd capacitor C23, and the other end of the 24th capacitor C24 are connected in parallel to one end of the 15th resistor R15; the other ends of the 17th capacitor C17, the 18th capacitor C18, the 23rd capacitor C23, and the 24th capacitor C24 are connected in parallel to the TVSS pin of the communication chip; the other ends of the 10th resistor R10 and the 15th resistor R15 are both connected to the NFC sensing area, which is also connected to one end of the 13th resistor R13, the other end of which is connected to the TVSS pin of the communication chip; the other end of the 5th capacitor C5 and the... The other end of the ninth resistor is connected; the fifth inductor L5 and the sixth inductor L6 are both 1µH; the fifth capacitor C5 is model CL10A150M08NQNC; the fourteenth capacitor C14 and the twenty-fifth capacitor C25 are both model CL10A220M08NQNC; the fifteenth capacitor C15 and the twenty-first capacitor C21 are both model CL10A121M08NQNC; the seventeenth capacitor C17 and the twenty-third capacitor C23 are both model CL10A620M08NQNC; the tenth resistor R10 and the fifteenth resistor R15 are both model RC0603-0.33Ω-F-1 / 10W; the eighteenth capacitor C18, the twenty-fourth capacitor C24, and the thirteenth resistor R13 can be left unconnected or their sizes can be selected according to requirements; wherein, the TX1 and TX2 pins of the communication chip output NFC radio frequency signals, which are optimized for signal impedance and filtered out noise by a matching network composed of the fifth inductor L5, the sixth inductor L6, the fourteenth capacitor C14, and the twenty-fifth capacitor C25, driving the NFC sensing area (the loop on the right in the figure) to emit a 13.56MHz radio frequency field; the antenna senses the external NFC signal, which is coupled to the RX pin of the communication chip through the matching network (the fifth capacitor C5 and the ninth resistor), demodulated and decoded internally by the chip, and then uploaded to the master control for processing via SPI.

[0026] As attached Figure 2 As shown, in this embodiment, the NFC_RST (NRSTPD) pin of the communication chip controls the chip reset and initializes the internal registers and states; the TVSS pin is connected to TVSS ground (analog ground, used for RF signal reference), and some capacitors (the fifteenth capacitor C15, the twenty-first capacitor C21, the seventeenth capacitor C17, and the twenty-third capacitor C23) are connected to TVSS to assist in RF signal filtering and improve anti-interference capability; the NFC communication module is based on the VRC520 chip, which can also be replaced by the GC1830. An external power supply / filter maintains stable operation, a crystal oscillator provides the clock, SPI interacts with the main controller, and TX / RX drives the antenna through a matching network to complete NFC RF transceiver (read and write NFC information function), realizing short-range wireless communication.

[0027] As attached Figure 3As shown, in this embodiment, the prompt tone module includes a voice prompt chip, which is an AT5040D chip. The prompt tone module also includes a thirteenth capacitor C13, a polarized capacitor E5, a twenty-eighth resistor R28, and a thirty-fifth resistor R35. The VDD pin of the voice prompt chip, one end of the thirteenth capacitor C13, and the positive terminal of the polarized capacitor E5 are connected in parallel to a fourth power supply. The other end of the thirteenth capacitor C13 and the negative terminal of the polarized capacitor E5 are connected in parallel to ground. The RST pin of the voice prompt chip is connected to one end of the twenty-eighth resistor R28, and the other end of the twenty-eighth resistor R28 is connected to a reset signal input. The DATA pin of the voice prompt chip is connected to one end of the thirty-fifth resistor R35. The other end of resistor R35 is connected to the control signal input. The thirteenth capacitor C13 is model CL10A104M08NQNC; the polarized capacitor E5 is model VEJ-6.3V101MH4.3-R (100µF / 6.3V); the twenty-eighth resistor R28 and the thirty-fifth resistor R35 are both model RC0603-1K-F-1 / 10W. The fourth power supply uses a 5V power supply. The fourth power supply provides the operating voltage for the voice prompt chip, powered through the VDD pin. The thirteenth capacitor C13 and the polarized capacitor E5 are used for filtering. The polarized capacitor E5 can be an electrolytic capacitor to filter out low-frequency ripple, and the thirteenth capacitor C13 can be a ceramic capacitor to filter out high-frequency noise, making the power input to the chip more stable and pure.

[0028] As attached Figure 3 As shown, in this embodiment, the GND pin of the voice prompt chip is grounded; the reset signal input (RST) is connected to the RST pin of the voice prompt chip through the 28th resistor R28. When the RST input is valid (usually low or with a specific timing), the chip returns to its initial state, ensuring reliable operation; the control signal input (DATA) is connected to the DATA pin of the voice prompt chip through the 35th resistor R35. DATA is used to transmit control commands to the chip, such as setting the frequency and duty cycle of the buzzer or playing a specific audio mode; the AT5040D chip integrates control logic and drive circuitry. Based on the input DATA signal, it generates a corresponding pulse width modulation (PWM) signal. PWM output: PWM1 and PWM2 pins are PWM signal output terminals, labeled BEELB and BEELA, used to drive the buzzer. By changing the duty cycle and frequency of the PWM, the buzzer can be controlled to emit sounds of different pitches and rhythms.

[0029] The BUSY pin of the voice prompt chip is a busy signal output terminal. When the chip is in working state (such as processing data or driving a buzzer), the BUSY pin will output a corresponding level signal to inform the external circuit chip of its working status, so as to facilitate the system to perform process control. The TG4 pin of the voice prompt chip is a reserved pin for specific functions.

[0030] The PWM signals output from the PWM1 and PWM2 pins of the voice prompt chip drive the buzzer (the buzzer is not shown in the figure; it can be connected to the PWM1 and PWM2 pins via connector P1 or directly). The buzzer's frequency and volume are determined by the frequency and duty cycle of the PWM signal, thus achieving different sound prompt functions. The entire circuit works as follows: a stable +5V power supply is filtered to power the AT5040D chip; the chip is reset externally via the RST pin; control commands are sent to the chip via the DATA pin; the chip generates PWM signals according to the commands and outputs them from the PWM1 and PWM2 pins to drive the buzzer to emit corresponding sounds; and the chip's operating status is fed back via the BUSY pin.

[0031] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. Typical known structures and common knowledge techniques in the preferred embodiments have not been described in detail here. Those skilled in the art can improve and implement the technical solution of this utility model based on the inspiration given in these embodiments and their own capabilities. Some typical known structures, known methods or common knowledge techniques should not be obstacles for those skilled in the art to implement this application.

[0032] The scope of protection claimed in this application shall be determined by the contents of its claims. The contents of the utility model description, specific embodiments, and drawings are used to interpret the claims.

[0033] Within the scope of the technical concept of this application, several modifications can be made to the specific implementation of this application, and these modified implementations should also be considered within the protection scope of this application.

Claims

1. A smart digital metering circuit for a battery powered vehicle with NFC, characterized in that: The device includes a prompt tone module, which emits a prompt tone when the NFC master card and the instrument are successfully matched, or when the NFC slave card and the instrument are successfully matched. The prompt tone module includes an AT5040D voice prompt chip, a thirteenth capacitor, a polarized capacitor, a twenty-eighth resistor, and a thirty-fifth resistor. The VDD pin of the voice prompt chip, one end of the thirteenth capacitor, and the positive terminal of the polarized capacitor are connected in parallel to a fourth power supply. The other end of the thirteenth capacitor and the negative terminal of the polarized capacitor are connected in parallel to ground. The RST pin of the voice prompt chip is connected to one end of the twenty-eighth resistor, and the other end of the twenty-eighth resistor is connected to a reset signal input. The DATA pin of the voice prompt chip is connected to one end of the twenty-eighth resistor, and the other end of the thirty-fifth resistor is connected to a control signal input. The PWM1 and PWM2 pins of the voice prompt chip are connected to a buzzer.

2. The smart digital metering circuit for battery operated vehicles with NFC as claimed in claim 1 wherein: It also includes an NFC communication module, an NFC master card, an NFC daughter card, and an MCU module. The NFC communication module is used to implement NFC communication and can identify the NFC master card and the NFC daughter card. The NFC master card is used to record electric bicycle unlocking information. The NFC daughter card is used to learn and record electric bicycle unlocking information. The MCU module is used to compare the electric bicycle unlocking information of the NFC master card. After a successful match, it controls the prompt tone module to issue a prompt. Then, when the NFC daughter card is successfully matched with the NFC communication module, the electric bicycle unlocking information is transmitted to the NFC daughter card, and the prompt tone module is controlled to issue a prompt.

3. The smart digital metering circuit for battery operated vehicles with NFC as claimed in claim 2 wherein: The NFC communication module includes a communication chip, on which multiple filter capacitors, decoupling circuits, clock circuits, and radio frequency transceiver circuits are connected. The filter capacitors are used to filter out high-frequency noise from the power supply, the decoupling circuits are used to suppress power supply fluctuations, and the clock circuits provide a reference clock signal for the communication chip. The radio frequency transceiver circuit is used for the transmit and receive links.

4. The smart digital metering circuit for battery operated vehicles with NFC as claimed in claim 3 wherein: The communication chip used is a VRC520 chip.

5. The smart digital metering circuit for battery operated vehicles with NFC as claimed in claim 3 wherein: The filter capacitor includes a third capacitor and a tenth capacitor. One end of the third capacitor is connected in parallel with the DVDD pin of the communication chip and then connected to the first power supply. The other end of the third capacitor is grounded. One end of the tenth capacitor is connected in parallel with the TVDD pin of the communication chip and then connected to the second power supply. The other end of the tenth capacitor is grounded. The decoupling circuit includes a sixth capacitor, an eighth capacitor, a fourth resistor, and a ninth resistor. One end of the sixth capacitor and one end of the fourth resistor are connected in parallel to the VMID pin of the communication chip. One end of the eighth capacitor and the AVDD pin of the communication chip are connected in parallel to the third power supply. The other end of the fourth resistor and one end of the ninth resistor are connected in parallel to the RX pin of the communication chip. The other end of the ninth resistor is connected to the radio frequency transceiver circuit. The clock circuit includes a crystal oscillator, a first capacitor, and a fourth capacitor. One end of the first capacitor is connected in parallel with pin 3 of the crystal oscillator and then connected to the OSCOUT pin of the communication chip. The other end of the first capacitor is grounded. One end of the fourth capacitor is connected in parallel with pin 1 of the crystal oscillator and then connected to the OSCIN pin of the communication chip. The other end of the fourth capacitor is grounded. Pins 2 and 4 of the crystal oscillator are grounded. The radio frequency transceiver circuit includes a fifth inductor, a sixth inductor, a fifth capacitor, a fourteenth capacitor, a fifteenth capacitor, a seventeenth capacitor, an eighteenth capacitor, a twenty-first capacitor, a twenty-third capacitor, a twenty-fourth capacitor, a twenty-fifth capacitor, a tenth resistor, a thirteenth resistor, and a fifteenth resistor. One end of the fifth inductor is connected to the TX1 pin of the communication chip, and the other end is connected in parallel with the fifteenth capacitor and then connected to one end of the fourteenth capacitor. The other end of the fifteenth capacitor is connected in parallel with one end of the twenty-first capacitor and then connected to the TVSS pin of the communication chip. One end of the fourteenth capacitor, one end of the seventeenth capacitor, and one end of the eighteenth capacitor are connected in parallel to one end of the tenth resistor. One end of the sixth inductor is connected to the TX2 pin of the communication chip, and the other end is connected in parallel with the twenty-first capacitor. The other end of the eleventh capacitor is connected in parallel to one end of the twenty-fifth capacitor. The other end of the twenty-fifth capacitor, along with one end of the fifth capacitor, one end of the twenty-third capacitor, and one end of the twenty-fourth capacitor, is connected in parallel to one end of the fifteenth resistor. The other end of the seventeenth capacitor, along with the other ends of the eighteenth capacitor, the twenty-third capacitor, and the twenty-fourth capacitor, is connected in parallel to the TVSS pin of the communication chip. The other ends of the tenth resistor and the fifteenth resistor are both connected to the NFC sensing area. The NFC sensing area is also connected to one end of the thirteenth resistor. The other end of the thirteenth resistor is connected to the TVSS pin of the communication chip. The other end of the fifth capacitor is connected to the other end of the ninth resistor.

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