A pressure data acquisition interaction circuit based on Bluetooth communication

Abstract

The utility model discloses a pressure data acquisition interaction circuit based on bluetooth communication, including power, singlechip, bluetooth, pressure sensor, display and voice module. Power module contains battery and power management chip, and the output end of battery is connected with the input end of power management chip, and the output end of the latter is connected with the power input end of singlechip, bluetooth, pressure sensor, display and voice module respectively. Pressure sensor signal output end connects singlechip first signal input end, and singlechip first signal output end connects display module signal input end, and second signal output end connects voice module signal input end, and singlechip serial port sending end, receiving end are connected with bluetooth module serial port receiving end, sending end respectively, and bluetooth module INT pin is external interrupt signal output end. The utility model can realize accurate collection, stable transmission and high energy consumption management of pressure data, satisfy the demand of multi -scene application.

Description

Technical Field

[0001] This utility model relates to, but is not limited to, the field of microcontroller and circuit technology, and in particular to a pressure data acquisition and interaction circuit based on Bluetooth communication. Background Technology

[0002] In the application of microcontroller-based technology to transmit sensor pressure values ​​to mobile phone software via Bluetooth, existing technologies have many limitations. Most current solutions employ simple data acquisition and transmission logic; after the sensor acquires the pressure value, the microcontroller performs only preliminary processing before sending the data via Bluetooth. However, during data transmission, Bluetooth signals are easily affected by complex electromagnetic environments, such as electromagnetic interference generated by numerous devices in an industrial workshop, leading to data loss and errors. Existing technologies lack effective anti-interference mechanisms, resulting in a significant reduction in the accuracy of the pressure data received by the mobile phone software. From a device operation perspective, existing solutions do not adequately optimize power consumption management for the microcontroller and Bluetooth module. To maintain stable Bluetooth transmission, the device typically operates in a high-power state, making it difficult to reduce power consumption even when pressure data changes little and frequent transmissions are unnecessary. This results in short battery life for battery-powered portable devices, such as wearable devices used for human pressure monitoring, where frequent charging severely impacts user experience. Furthermore, existing technologies do not fully consider the power consumption requirements of devices in different operating scenarios, failing to achieve intelligent dynamic power consumption adjustment. Utility Model Content

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims. This invention aims to at least address one of the technical problems existing in the prior art. To this end, embodiments of this invention provide a pressure data acquisition and interaction circuit based on Bluetooth communication, capable of achieving accurate pressure data acquisition, stable transmission, and efficient energy consumption management, meeting the needs of multiple application scenarios.

[0004] This utility model embodiment provides a pressure data acquisition and interaction circuit based on Bluetooth communication, including a power module, a microcontroller module, a Bluetooth module, a pressure sensor module, a display module, and a voice module. The power module includes a battery and a power management chip. The output terminal of the battery is connected to the input terminal of the power management chip. The output terminal of the power management chip is connected to the power input terminals of the microcontroller module, the Bluetooth module, the pressure sensor module, the display module, and the voice module, respectively. The signal output terminal of the pressure sensor module is connected to the first signal input terminal of the microcontroller module. The first signal output terminal of the microcontroller module is connected to the signal input terminal of the display module. The second signal output terminal of the microcontroller module is connected to the signal input terminal of the voice module. The serial port transmitting terminal of the microcontroller module is connected to the serial port receiving terminal of the Bluetooth module, and the serial port receiving terminal of the microcontroller module is connected to the serial port transmitting terminal of the Bluetooth module. The INT pin of the Bluetooth module is an external interrupt signal output terminal.

[0005] According to some embodiments of this utility model, the serial port receiving end of the Bluetooth module is the BT_RXD pin, and the serial port transmitting end of the Bluetooth module is the BT_TXD pin; the serial port transmitting end of the microcontroller module is connected to the BT_RXD pin, and the serial port receiving end of the microcontroller module is connected to the BT_TXD pin.

[0006] According to some embodiments of the present invention, the power module further includes a charging indicator circuit, which includes a first LED and a second LED. The charging indicator output terminal of the power management chip is connected to the control terminal of the first LED, and the fully charged indicator output terminal of the power management chip is connected to the control terminal of the second LED.

[0007] According to some embodiments of the present invention, the voltage range of the battery is 3.2V to 4.2V.

[0008] According to some embodiments of this utility model, the TX pin of the microcontroller module is connected to the RX pin of the display module, and the RX pin of the microcontroller module is connected to the TX pin of the display module.

[0009] According to some embodiments of this utility model, the PDN pin of the Bluetooth module is connected to the PDN control pin of the microcontroller module, and the WKP pin of the Bluetooth module is connected to the WKP control pin of the microcontroller module.

[0010] According to some embodiments of the present invention, the circuit further includes a power amplifier module, wherein the signal output terminal of the voice module is connected to the signal input terminal of the power amplifier module, and the signal output terminal of the power amplifier module is connected to the input terminal of the speaker.

[0011] According to some embodiments of this utility model, the Bluetooth module establishes a connection with an external applet via a wireless Bluetooth link to transmit the pressure data transmitted by the microcontroller module to the external applet.

[0012] According to some embodiments of this utility model, the pressure sensor module outputs an analog pressure signal, and the first signal input terminal of the microcontroller module is an AD conversion input terminal, used to receive the analog pressure signal and perform analog-to-digital conversion and digital processing. The processed pressure data is transmitted to the display module through the first signal output terminal and to the Bluetooth module through the serial port associated with the second signal output terminal.

[0013] According to some embodiments of this utility model, when there is no charging operation, both the charging indicator output terminal and the full charge indicator output terminal of the power management chip are set high, and both the first LED and the second LED are off; when the charging is not fully charged, the charging indicator output terminal is pulled low, the first LED is lit, the full charge indicator output terminal is set high, and the second LED is off; when the charging is fully charged, the full charge indicator output terminal is pulled low, the second LED is lit, the charging indicator output terminal is set high, and the first LED is off.

[0014] This utility model embodiment has at least the following beneficial effects: By employing a pressure sensor module with environmental compensation function, combined with an optimized data processing algorithm within the microcontroller module, errors caused by environmental interference in the original pressure data can be effectively reduced, ensuring the accuracy of the collected data; the Bluetooth module, equipped with a verification mechanism, can effectively reduce the packet loss rate during data transmission, greatly improving transmission stability. Thus, accurate pressure data acquisition, stable transmission, and efficient display are achieved, meeting the needs of multiple application scenarios. Simultaneously, optimized power management of the microcontroller and Bluetooth module effectively extends the device's battery life and enhances the user experience.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0016] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0017] Figure 1 This is a schematic diagram of the overall circuit module provided in one embodiment of the present invention; Figure 2This is a schematic diagram of a power module circuit provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of a Bluetooth module circuit provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of a voice module provided in one embodiment of the present invention; Figure 5 This is a schematic diagram of a microcontroller module provided in one embodiment of the present invention; Figure 6 This is a schematic diagram of a circuit module provided in one embodiment of the present invention; Figure 7 This is a schematic diagram of the data transmission process provided in one embodiment of the present invention; Figure 8 This is a schematic diagram of the overall process provided in one embodiment of the present invention. Detailed Implementation

[0018] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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.

[0020] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0023] See Figure 1 , Figure 1This is a schematic diagram of the overall module of a pressure data acquisition and interaction circuit based on Bluetooth communication, according to one embodiment of this utility model. The circuit includes a power supply module, a microcontroller module, a Bluetooth module, a pressure sensor module, a display module, and a voice module. The power supply module includes a battery and a power management chip. The output terminal of the battery is connected to the input terminal of the power management chip, and the output terminal of the power management chip is connected to the power input terminals of the microcontroller module, Bluetooth module, pressure sensor module, display module, and voice module, respectively, providing stable power to each module.

[0024] like Figure 2-6 As shown, the signal output terminal of the pressure sensor module is connected to the first signal input terminal (such as the AD conversion input terminal) of the microcontroller module; the first signal output terminal (such as the serial port TX / RX pin) of the microcontroller module is connected to the signal input terminal (such as the serial port TX / RX pin) of the display module; the second signal output terminal (BUSY, DATA, CLK pins) of the microcontroller module is connected to the signal input terminal (corresponding to BUSY, DATA, CLK pins) of the voice module; the serial port transmitting terminal (RXD_MCU pin) of the microcontroller module is connected to the serial port receiving terminal (BT_TXD pin) of the Bluetooth module, and the serial port receiving terminal (RXD_MCU pin) of the microcontroller module is connected to the serial port transmitting terminal (BT_TXD pin) of the Bluetooth module; the INT pin of the Bluetooth module is connected to the INT pin of the microcontroller module, serving as the external interrupt signal output terminal; the signal output terminal of the voice module is connected to the signal input terminal (IN+ pin) of the power amplifier module, and the signal output terminal of the power amplifier module is connected to the input terminal of the speaker.

[0025] In one feasible embodiment, the pressure sensor module is responsible for collecting pressure analog signals, the microcontroller module performs analog-to-digital conversion and digital processing on the analog signals, and the processed data is transmitted to the display module for visualization on the one hand, and wirelessly transmitted to an external applet via the Bluetooth module on the other hand, while the voice module performs voice broadcast according to the status.

[0026] In one feasible embodiment, the power module further includes a charging indicator circuit, which includes a first LED (LED1) and a second LED (LED2). The charging indicator output terminal of the power management chip is connected to the control terminal of the first LED, and the fully charged indicator output terminal of the power management chip is connected to the control terminal of the second LED.

[0027] In one feasible embodiment, the battery voltage range is 3.2V to 4.2V.

[0028] In one feasible embodiment, when there is no charging operation, both the charging indicator output terminal and the fully charged indicator output terminal of the power management chip are high, and both the first LED and the second LED are off; when the charging is not fully charged, the charging indicator output terminal is low, the first LED is lit, the fully charged indicator output terminal is high, and the second LED is off; when the charging is fully charged, the fully charged indicator output terminal is low, the second LED is lit, the charging indicator output terminal is high, and the first LED is off.

[0029] Specifically, the power management chip undertakes the task of "boost-buck" power conversion. It first boosts the 3.2V~4.2V voltage output by the battery to 5V, and then bucks it to 3.3V. Finally, it connects to the power input terminals of the microcontroller module, Bluetooth module, pressure sensor module, display module, and voice module through the output terminal, providing a stable 3.3V operating voltage for each module and ensuring the reliable operation of each module. Meanwhile, the charging indicator circuit includes a first LED and a second LED. The charging indicator output terminal of the power management chip is connected to the control terminal of the first LED, and the full charge indicator output terminal is connected to the control terminal of the second LED. The charging status is intuitively indicated by the on / off state of the LEDs. When there is no charging operation, both the charging indicator output terminal and the full charge indicator output terminal of the power management chip output a high level, and neither the first nor the second LED lights up because there is no conducting current. When the charge is not full, the charging indicator output terminal of the power management chip is pulled low, and the first LED lights up because it receives conducting current. The full charge indicator output terminal remains at a high level, and the second LED lights up. When the charge is full, the full charge indicator output terminal of the power management chip is pulled low, the second LED lights up, the charging indicator output terminal returns to a high level, and the first LED lights up.

[0030] In one feasible embodiment, such as Figure 3 and 4 As shown, the Bluetooth module can be the Huapu Microelectronics HM-BT4531, which realizes bidirectional data interaction of "serial communication - wireless Bluetooth transmission". Its serial port receiving end is the BT_RXD pin, and the serial port transmitting end is the BT_TXD pin. The serial port transmitting end TXD_MCU pin of the microcontroller module is connected to the BT_RXD pin, and the serial port receiving end RXD_MCU pin is connected to the BT_TXD pin. This establishes a physical link for serial communication between the microcontroller and the Bluetooth module, so that the serial data of the microcontroller can be input to the Bluetooth module, and the serial data of the Bluetooth module can also be sent back to the microcontroller. The INT pin of the Bluetooth module is connected to the INT pin of the microcontroller module to output an external interrupt signal to the microcontroller.

[0031] In one feasible embodiment, the PDN pin of the Bluetooth module is connected to the PDN control pin of the microcontroller module, and the WKP pin is connected to the WKP control pin of the microcontroller module. The microcontroller can enable / disable the Bluetooth module by outputting control signals to the PDN pin, and wake up the Bluetooth module in a low-power state through the WKP pin, thus flexibly controlling the working state of the Bluetooth module.

[0032] In one feasible embodiment, regarding wireless interaction, the Bluetooth module establishes a connection with an external mini-program via a wireless Bluetooth link. This allows it to both "transmit" pressure data from the microcontroller to the mini-program and receive control commands from the mini-program. The module also connects to the microcontroller via a serial port, establishing bidirectional communication between the microcontroller and the mobile device. Parameters such as the serial port baud rate (default 115200bps, 8 data bits, no parity, 1 stop bit) and BLE connection interval can be set using specified AT commands (e.g., AT+BAUD=1). The module's serial port Rx can input a maximum of 2KB at a time, automatically packetizing or sending complete packets according to the Bluetooth protocol. Data packets sent from the host to the module must be transmitted through the corresponding service channel. Upon receiving a wireless packet, the module first outputs a low level from its INT port. Then, data is output from the serial port Tx terminal. Strings that start with "TTM:" and end with "\r\n\0" will be recognized as AT commands (after execution, they will return results such as "TTM:OK\r\n\0" or "TTM:ERP\r\n\0"). Serial port data packets that do not conform to this rule will be forwarded directly as transparent data. In addition, the serial port baud rate that matches the microcontroller can be set through commands such as AT+BAUD=1, the Bluetooth name can be set through AT+NAME=XXX, and the pairing password can be set through AT+PIN=XXXX. The master-slave mode can be set through AT+ROLE=0 (slave, passively waiting for connection) or AT+ROLE=1 (master, actively searching for connection). In this solution, the Bluetooth module is usually used as a slave for the applet to actively connect.

[0033] In one feasible embodiment, the pressure sensor module outputs an analog pressure signal. The first signal input terminal of the microcontroller module is an AD conversion input terminal, used to receive the analog pressure signal and perform analog-to-digital conversion and digital processing. The processed pressure data is transmitted to the display module through the first signal output terminal and to the Bluetooth module through the serial port associated with the second signal output terminal. Specifically, when the pressure sensor collects pressure, the output analog signal is received by the AD conversion input terminal of the microcontroller. The microcontroller performs analog-to-digital conversion and digital processing on it. Since the output curve of the pressure sensor differs from the ideal linear curve in the specification in actual applications, the microcontroller program can compensate for the pressure data in four intervals to improve the accuracy of the pressure value. The processed pressure digital data is transmitted to the display module through the first signal output terminal of the microcontroller module, and to the voice module through the BUSY, DATA, and CLK pins associated with the second signal output terminal. At the same time, it is transmitted to the Bluetooth module through the serial port, realizing multi-channel output of pressure data: "display-voice broadcast-wireless transmission".

[0034] In one feasible embodiment, the display module and the microcontroller module communicate via a serial port. The TX pin of the microcontroller module is connected to the RX pin of the display module, and the RX pin is connected to the TX pin of the display module. The microcontroller sends the pressure data, which has undergone analog-to-digital conversion and digital processing (including range compensation), to the RX pin of the display module through the TX pin. After receiving the data, the display module displays the pressure value on the screen in real time, allowing the user to intuitively obtain the current pressure data.

[0035] In one feasible embodiment, the voice module adopts WT588F02B-8S, which has built-in voice storage and playback functions. It can broadcast Bluetooth connection status (such as "connection successful" or "Bluetooth disconnected") and other guidance voice information according to the status. The signal output terminal of the voice module is connected to the signal input terminal (IN+ pin of FM8002) of the power amplifier module. The power amplifier module adopts FM8002, and its signal output terminal (BL1 and BL2 pins) is connected to the input terminal of the speaker to amplify the signal output by the voice module, so that the speaker can output clearer and louder voice.

[0036] In a feasible embodiment, the circuit further includes a programming interface: the SWCLK, SWDIO, and nRST1 pins of the microcontroller programming port are connected to the SWCLK, SWDIO, and NRST pins of the microcontroller module, respectively, for programming and debugging of the microcontroller; the CLK PCI, DATA, CLK, BUSY, 5V, and GND pins of the voice module programming port P2 are connected to the CLK PCI, DATA, CLK, BUSY, 5V, and GND pins of the voice module WT588F02B-8S, respectively, for programming voice data.

[0037] In one feasible embodiment, such as Figure 7 and 8 As shown, regarding data flow and exception handling, after the device is powered on, the Bluetooth module enters the working state and attempts to establish a Bluetooth connection with the external mini-program. If the connection is successful, the voice module announces "Connection successful," and the data acquisition and transmission process begins. If the connection fails, it enters the "waiting for connection" state and continues to attempt to establish a connection. After a successful connection, the pressure sensor module continuously acquires pressure values. After analog-to-digital conversion and digital processing (range compensation) by the microcontroller, one path is transmitted to the display module via serial port to achieve "real-time pressure value display," and the other path is transmitted to the Bluetooth module via serial port. The Bluetooth module encapsulates the data into Bluetooth data packets and broadcasts them wirelessly to the paired mini-program via the built-in antenna to achieve "wireless reporting of pressure data." If the distance is too great... In the event of Bluetooth connection interruption due to factors such as distance or strong electromagnetic interference, the module will trigger an automatic reconnection mechanism. After the microcontroller or mini-program detects the connection loss, it will re-initiate the search and pairing process to attempt to restore the connection. During data transmission and reception, the program incorporates CRC and other verification mechanisms to verify the integrity and correctness of the data. If the verification fails, it will trigger processing logic such as "data retransmission" or "error message" to ensure data reliability. When it is necessary to shut down, the mini-program or microcontroller will first actively initiate a "disconnect Bluetooth connection" command. After disconnection, the voice module will announce "Bluetooth disconnected". Then, the microcontroller will control the power enable pin to turn off the 3.3V power supply to the Bluetooth module and other peripherals. Finally, the main power supply will be cut off to ensure device safety and stability for the next startup.

[0038] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A pressure data acquisition and interaction circuit based on Bluetooth communication, characterized in that, The system includes a power module, a microcontroller module, a Bluetooth module, a pressure sensor module, a display module, and a voice module. The power module comprises a battery and a power management chip. The output terminal of the battery is connected to the input terminal of the power management chip. The output terminal of the power management chip is connected to the power input terminals of the microcontroller module, the Bluetooth module, the pressure sensor module, the display module, and the voice module, respectively. The signal output terminal of the pressure sensor module is connected to the first signal input terminal of the microcontroller module. The first signal output terminal of the microcontroller module is connected to the signal input terminal of the display module. The second signal output terminal of the microcontroller module is connected to the signal input terminal of the voice module. The serial port transmitting terminal of the microcontroller module is connected to the serial port receiving terminal of the Bluetooth module, and the serial port receiving terminal of the microcontroller module is connected to the serial port transmitting terminal of the Bluetooth module. The INT pin of the Bluetooth module is an external interrupt signal output terminal.

2. The circuit according to claim 1, characterized in that, The serial port receiving end of the Bluetooth module is the BT_RXD pin, and the serial port transmitting end of the Bluetooth module is the BT_TXD pin; the serial port transmitting end of the microcontroller module is connected to the BT_RXD pin, and the serial port receiving end of the microcontroller module is connected to the BT_TXD pin.

3. The circuit according to claim 1, characterized in that, The power module also includes a charging indicator circuit, which includes a first LED and a second LED. The charging indicator output terminal of the power management chip is connected to the control terminal of the first LED, and the fully charged indicator output terminal of the power management chip is connected to the control terminal of the second LED.

4. The circuit according to claim 1, characterized in that, The battery has a voltage range of 3.2V to 4.2V.

5. The circuit according to claim 1, characterized in that, The TX pin of the microcontroller module is connected to the RX pin of the display module, and the RX pin of the microcontroller module is connected to the TX pin of the display module.

6. The circuit according to claim 1, characterized in that, The PDN pin of the Bluetooth module is connected to the PDN control pin of the microcontroller module, and the WKP pin of the Bluetooth module is connected to the WKP control pin of the microcontroller module.

7. The circuit according to claim 1, characterized in that, The circuit also includes a power amplifier module, wherein the signal output terminal of the voice module is connected to the signal input terminal of the power amplifier module, and the signal output terminal of the power amplifier module is connected to the input terminal of the speaker.

8. The circuit according to claim 1, characterized in that, The Bluetooth module establishes a connection with an external mini-program via a wireless Bluetooth link to transmit the pressure data transmitted by the microcontroller module to the external mini-program.

9. The circuit according to claim 1, characterized in that, The pressure sensor module outputs an analog pressure signal. The first signal input terminal of the microcontroller module is an AD conversion input terminal, which is used to receive the analog pressure signal and perform analog-to-digital conversion and digital processing. The processed pressure data is transmitted to the display module through the first signal output terminal and to the Bluetooth module through the serial port associated with the second signal output terminal.

10. The circuit according to claim 3, characterized in that, When there is no charging operation, both the charging indicator output and the full charge indicator output of the power management chip are high, and neither the first LED nor the second LED is lit. When the charging is not fully charged, the charging indicator output is low, the first LED is lit, the full charge indicator output is high, and the second LED is not lit. When the charging is fully charged, the full charge indicator output is low, the second LED is lit, the charging indicator output is high, and the first LED is not lit.

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