CN107970032A - a smart bracelet - Google Patents

Abstract

The embodiment of the invention provides an intelligent bracelet, which comprises a Bluetooth data communication circuit, a step counting circuit, an electrocardiosignal acquisition circuit, a body temperature detection circuit, a notification circuit and a power supply circuit, wherein the Bluetooth data communication circuit comprises a DA4580 Bluetooth control chip, the step counting circuit comprises an MPU-6050 motion processing sensor chip, the electrocardiosignal acquisition circuit comprises a BMD101 electrocardiosignal acquisition chip and an ECG electrocardiosignal acquisition circuit, the body temperature detection circuit comprises a DS1624 digital temperature sensor chip, the notification circuit comprises a buzzer circuit, a vibration motor circuit and an L ED flashing circuit, and the power supply circuit comprises a rechargeable battery, a power supply module and a charging module.

Description

a smart bracelet

technical field

The invention belongs to the field of electronic technology, and in particular relates to a smart bracelet.

Background technique

With the development of technology, various wearable devices have gradually become popular, among which smart bracelets have always been the most common wearable devices. Existing smart wristbands are designed to monitor various body functions and exercise conditions of users in real time and to remind users accordingly. However, the communication circuit design of the existing smart bracelets is not reasonable enough, resulting in that the performance of the smart bracelets cannot meet the needs.

Contents of the invention

Aiming at the problem of unreasonable smart bracelet circuit design in the prior art, the technical problem to be solved by the present invention is to provide a smart bracelet that can achieve stable and reliable signal acquisition and maintain high efficiency and standby time.

In order to solve the above problems, an embodiment of the present invention proposes a smart bracelet, including a Bluetooth data communication circuit, a pedometer circuit, an ECG signal acquisition circuit, a body temperature detection circuit, a notification circuit, and a power supply circuit.

The beneficial effects of the above-mentioned technical solution of the present invention are as follows: the embodiment of the present invention proposes a smart bracelet, which can be connected to a pedometer circuit, a notification circuit, a body temperature detection circuit, and an electrocardiogram signal acquisition circuit through a Bluetooth data communication circuit to achieve stable and efficient Various parameters are collected and sent to the connected smart terminal through Bluetooth data communication.

Description of drawings

Fig. 1 is the circuit diagram of the bluetooth data communication circuit of the embodiment of the present invention;

Fig. 2 is the circuit connection structural diagram of the pedometer circuit of the embodiment of the present invention;

Fig. 3 is the circuit connection structural diagram of the ECG signal acquisition circuit of the embodiment of the present invention;

Fig. 4 is a circuit structure diagram in which a snubber inductance is used between the analog ground AGND and the digital ground GND in Fig. 3 to realize one-point grounding;

5 is a circuit connection structure diagram of a body temperature detection circuit of a smart bracelet according to an embodiment of the present invention;

Fig. 6 is the circuit connection structural diagram of the buzzer circuit of the notification circuit of the embodiment of the present invention;

7 is a circuit connection structure diagram of the vibration motor circuit of the notification circuit of the embodiment of the present invention;

8 is a circuit connection structure diagram of the LED flashing circuit of the notification circuit of the embodiment of the present invention;

9 is a circuit diagram of a charging module of a power supply circuit according to an embodiment of the present invention;

FIG. 10 is a circuit diagram of a power supply module of a power supply circuit according to an embodiment of the present invention.

detailed description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

An embodiment of the present invention proposes a smart wristband, including a Bluetooth data communication circuit, a pedometer circuit, an electrocardiographic signal acquisition circuit, a body temperature detection circuit, a notification circuit, and a power supply circuit. The Bluetooth data communication circuit includes DA4580 Bluetooth control chip, the pedometer circuit includes MPU-6050 motion processing sensor chip, the ECG signal acquisition circuit includes BMD101 ECG acquisition chip and ECG ECG acquisition circuit, and the body temperature detection circuit includes DS1624 digital temperature sensor chip The notification circuit includes a buzzer circuit, a vibration motor circuit, and an LED flashing circuit, and the power supply circuit includes a rechargeable battery, a power supply module and a charging module.

specific:

Wherein the Bluetooth data communication circuit is shown in Figure 1, including DA4580 Bluetooth control chip, wherein said DA4580 Bluetooth control chip is provided with I/O pins P0_0～P0_7 and pins P1_0～P1_3 for respectively connecting the smart bracelet sensor chip , pins P2_0～P0_9; the P0_0 pin is connected to the interrupt control interface of the MPU-6050 motion processing sensor chip of the pedometer circuit, and the P0_1 pin is connected to the interrupt control of the MPU-6050 motion processing sensor chip of the pedometer circuit Interface, the P0_2 pin is connected to the I2C bus serial data interface SDA of the MPU-6050 motion processing sensor chip of the pedometer circuit, and the P0_1 pin is connected to the I2C bus serial clock interface of the MPU-6050 motion processing sensor chip of the pedometer circuit SCL; the P0_3 pin is connected to the eighth pin DCLR of the air pressure sensor; the P0_4 pin is connected to the buzzer; the P0_5 pin is connected to the motor of the notification circuit; the P0_6 pin is connected to the LED red light of the notification circuit; the P0_7 tube The pin is connected to the LED green light of the notification circuit; the P1_0 pin is connected to the LED yellow light of the notification circuit; the P1_1 pin is connected to the I2C bus serial data communication interface SDA of the first pin of the DS1624 digital temperature sensor chip of the body temperature detection circuit; The P1_2 pin is connected to the I2C bus serial input clock interface SCL of the second pin of the DS1624 digital temperature sensor chip of the body temperature detection circuit; the P1_3 pin is connected to the fourth pin of the BMD101 ECG acquisition chip of the ECG signal acquisition circuit Signal output terminal TX; the reset circuit connection interface RST of the seventeenth pin of the DA4580 Bluetooth control chip is connected to the reset circuit, and the reset circuit includes an input voltage providing a reset high level and a controllable switch SW-PB, and The reset circuit connection interface RST of the seventeenth pin is also grounded through the reset resistor R17; the twenty-ninth pin XTAL16Mm and the thirtieth pin XTAL16Mp pins of the DA4580 Bluetooth control chip are connected to a digital control oscillator and an external crystal oscillator Y2; the eleventh pin XTAL32Km and the twelfth pin XTAL32Kp of the DA4580 Bluetooth control chip are connected to the RC oscillator external crystal oscillator Y1; the thirty-fifth pin RFIOp of the DA4580 Bluetooth control chip is connected to the antenna ANT. As shown in Figure 1, the fourteenth pin VBAT_RF of the DA4580 Bluetooth control chip is grounded through a capacitor C15; the fifteenth pin VBAT3V is grounded through a capacitor C11; the nineteenth pin VDCDV is grounded through a capacitor C10; One pin SWITCH is grounded through the inductor L2 and capacitor C16; the twenty-third pin VBAT1V is grounded through the parallel capacitor C14 and capacitor C16; the twenty-fifth pin SWDIO and the twenty-sixth pin SW_CLK are connected to the external SWD interface; The thirty-first pin VDCDC_RF is grounded through the capacitor C13. As shown in FIG. 1 , the sixteenth pin GND, the fifth pin NC, the thirty-fourth pin RFIOm, and the zeroth pin GND are all grounded. Among them, the DA14580 minimum system design adopts the step-down mode, powered by a nickel-manganese rechargeable lithium battery. As shown in FIG. 1, the resistance value of the reset resistor R17 is 3.3KΩ. Among them, the external crystal oscillator Y1 of the digital control oscillator is 16.000MHz; the external crystal oscillator Y2 of the RC oscillator is 32.768kHz.

Among them, the connection of the I/O pin can be as follows:

pin name connect P0_0 MPU-6050 INT(12) P0_1 MPU-6050 SDA(24) P0_2 MPU-6050 SCL(23) P0_3 BMP085 XCLR(8) P0_4 Buzzer NPN(B) P0_5 Motor NPN(B) P0_6 LED_RED Positive P0_7 LED_GREREN Positive P1_0 LED_YELLOW Positive P1_1 DS1624 SDA(1) P1_2 DS1624 SCL(2) P1_3 BMD101TX(4)

As shown in Figure 2, the pedometer circuit includes an MPU-6050 motion processing sensor chip; the thirteenth pin power supply interface VDD is connected to the power supply circuit BAT_3.3V, and the voltage of the power supply circuit is 3.3V±0.5%; and the The thirteenth pin power supply interface VDD of the MPU-6050 motion processing sensor chip is grounded to GND through the second capacitor C2. The first pin Pin 1 (CLKIN) is used as an optional external clock input; in the embodiment of the present invention, the first pin is not used and is directly grounded to GND. The sixth pin Pin6 is the serial data interface AUX_DA of the external air pressure sensor, which is connected to the external air pressure sensor. The seventh pin Pin 7 is the serial clock interface AUX_CL of the external air pressure sensor, which is connected to the clock of the external air pressure sensor. The eighth pin Pin 8 is the logic power supply voltage VLOGIC, connected to the voltage value of the logic power supply circuit BAT_3.3V, and its trigger mode is monotonic edge trigger, connected to a 10nF capacitor C4. The ninth pin Pin 9 is the signal group power interface AC0, which is connected to the I2C bus as the least significant bit of the address Slave Address LSB (Least Significant Bit). The signal group power interface AC0 in the embodiment of the present invention is set as the signal group power interface Signal Group power port. The tenth pin Pin 10 is the calibration filter capacitor interface, which is connected to a 0.1μF capacitor C1. The eleventh pin, Pin 11, is used to input FSYNC for frame synchronization data, and is grounded to GND. The twelfth pin Pin12 interrupt control interface INT is connected to the P0_0 interface of the Bluetooth communication chip SoC. The twentieth pin Pin 20 is the charge pump connection interface CPOUT connected to the charge pump C3 with a capacitance value of 10nF. The serial data interface SDA of the 23rd pin I2C bus is connected to the P0_2 interface of the Bluetooth communication chip SoC; the serial clock interface SCL of the 24th pin I2C bus is connected to the P0_1 interface of the Bluetooth communication chip SoC.

The circuit structure of the ECG signal acquisition circuit is shown in Figure 3 and Figure 4. The ECG signal acquisition module uses the BMD101 sensor of Shennian Technology as the core of the design. Among them, Pin 0 (CS) is the chip selection pin; Pin 1 (SEP) and Pin 2 (SEN) are the electrode analog signal input terminals, which are used to collect the ECG analog signal; Pin 3 (RX) is the communication between BMD101 and the serial port The interface for receiving data at the time, that is, the data writing terminal; Pin 4 (TX) is the BMD101 signal output terminal, which is connected to the Pin 6 (P1_3) port of the DA14580 chip; Pin 5 is the high-level RC reset circuit, and a 10K pull-up resistor is set R3 (R3 needs to be connected in parallel with a Zener diode D1 to stabilize the voltage) and a 0.1μF filter capacitor C4; Pin 6 is GND; Pin 7 is VDD, and a 10μF filter capacitor C5 is connected in series between VDD and GND (that is, decoupling, Eliminate high-frequency noise); AGND is the analog ground of the circuit, and the analog ground and digital ground cannot be directly short-circuited, otherwise it will cause mutual interference. Since the equipment measures low-frequency analog signals, the signal terminal can be regarded as a voltage source. As shown in Figure 2, the design adopts a one-point ground connection method, thickens the analog ground AGND, and shortens its length, and adds a 10μH inductance between the analog ground AGND and the digital ground GND as a buffer to Reduce mutual interference between the two.

The circuit structure of the body temperature detection circuit is shown in Figure 5. The DS1624 digital temperature sensor chip is used as the chip. Its Pin 1 (SDA) is the I2C serial data communication interface, and Pin 2 (SCL) is the I2C serial input clock. P1_1 and P1_2 are connected, and the pull-up resistance of the two interfaces is 4.7KΩ; Pin 3 is NC; Pin 4 is GND; Pin 5, 6, 7 (A0, A1, A2) are address input terminals, and the number of address codes Determines the number of DS1624s that can be mounted on the SDA bus. There is only one temperature measurement chip in the body temperature module, so here A0, A1, and A2 can be directly connected to GND; Pin8 (VCC) is the DS1624 working voltage input interface, which is determined by DC-DC output voltage (BAT_3.3V) is provided.

As shown in Figure 6, Figure 7, and Figure 8, the notification circuit includes a buzzer circuit, a vibration motor circuit, and an LED flashing circuit;

Wherein the buzzer circuit includes a buzzer Buzzer and a triode 3904, wherein the buzzer is connected in parallel with a third resistor R3, and is connected to the power supply circuit BAT 3.3V and the collector of the triode, and the emitter of the triode is grounded to GND , the base of the triode 3904 is connected to the P0_4 pin of the Bluetooth communication chip through the current limiting resistor R4, and grounded to GND through the filter capacitor C6;

Wherein the vibration motor circuit includes a motor M1 and an NPN transistor Q1; wherein the vibration motor M1 is connected in parallel with a Zener diode D1, and is connected to the power supply circuit BAT 3.3V and the collector of the transistor Q1; and the base of the transistor Q1 is current-limited The resistor R6 is connected to the P0_5 pin of the Bluetooth communication chip, and the emitter of the transistor Q1 is grounded to GND; and the filter capacitor C6 is grounded to GND;

Wherein the LED flashing circuit includes at least one LED lamp, and the LED lamp is connected to the Bluetooth communication chip through a current limiting resistor.

The buzzer circuit is mainly used to send out buzzing prompts. The circuit design principle is shown in Figure 6; the buzzer’s access voltage is 3.3V, and the buzzer Buzzer here is capacitive, and a 2KΩ resistor R3 needs to be connected in parallel. In order to increase the volume of the buzzer, the other end of the buzzer needs to be connected to a triode for driving. The B pole (base) of the triode is controlled by the Bluetooth communication chip DA14580Soc P0_5 pin. The B limiting current resistor R4 is 4.7K, and the filter Capacitor C6 is 1nF.

The vibration motor circuit is a DC motor that uses an eccentric wheel to generate inertial vibration. It is mainly used to send out vibration prompts. Its circuit design is shown in Figure 7. Pin P0_5 is the base control port of NPN transistor Q1, and its current limiting resistor R6 is 100 ohms. The calculation formula is as follows:

R _CLR ＝(V _in -V _VF )/I _COC

Among them, R _CLR is the desired current limiting resistance, V _in is the input voltage, V _VF is the forward conduction voltage drop of the triode, and I _COC is the set current limiting current.

When the base is set high, the NPN is turned on, and when it is set low, it is turned off. BAT_3.3V (3.3V) is the normal working voltage of the vibration motor, which is input from its positive terminal. The diode D1 is a Zener diode of the miniature vibration motor M1, and is used to keep the voltage of the vibration motor M1 stable.

The LED lights designed by the LED flashing circuit have red, blue and yellow colors, which are programmed and controlled by the three pins P0_6, P0_7, and P0_8 of the Bluetooth communication chip DA14580Soc; the circuit design principle is shown in Figure 8.

The power supply circuit includes a charging module as shown in FIG. 9 and a power supply module as shown in FIG. 10 , and also includes a rechargeable battery BT1.

In one embodiment of the present invention, the rechargeable battery BT1 is a SUN 452535 rechargeable lithium battery; its charging voltage is 4.2V, its normal input voltage is 3.7V, and it is charged through a USB interface.

As shown in Figure 9, the VBUS input voltage of the charging module USB is 5V, and the USB charging management chip is the charging management chip LTC4053-4.2 of Linear Company, and its input voltage is connected from the second pin Pin 2 (VCC). The output charging voltage is output from the ninth pin Pin 9 (BAT); the output voltage is generally 4.2V ~ 5V; the output current I _BAT is determined by the external resistor R16 connected to the seventh pin Pin 7 (PROG). Pin PROG is the charging current and charging current monitoring program pin. As an example to explain, the resistance value of the external resistor R16 (also called R _PROG ) can be calculated by the following formula:

I _CHG ＝(I _PROG )×1000＝(1.5V/R _PROG )×1000

R _PROG ＝1500V/I _CHG

Wherein, RPROG is the resistor R16 connected to the seventh pin _PROG . If the charging current set by the charging module is 100mA, RPROG can be obtained as 15KΩ.

Wherein the sixth pin Pin 6 (NTC) has a negative temperature coefficient, which is set to zero in the embodiment of the present invention. The fifth pin Pin 5 (GND) is a chip ground pin, which is grounded to GND. The fourth pin Pin 4 (TIMER) is a charging time setting pin, and the charging time is determined by the magnitude of the first capacitor C8 externally connected to the fourth pin TIMER. To explain as an example, the calculation formula of the first capacitor C8 is as follows:

Timer(Hours)＝(3Hours)×(C _TIMER /0.1μF)

From this, it can be calculated that the first capacitor C8 (also referred to as C _TIMER ) of the fourth pin TIMER can be calculated by the following formula:

C _TIMER ＝0.1μF×Time(Hours)/3(Hours)

Assuming that the predetermined charging time is 3 hours, the first capacitor C8 (also referred to as C _TIMER ) can be obtained from the formula as 0.1 μF.

As shown in FIG. 10 , the output voltage of the power supply module is 3.3V±0.5%, and the output current is 1200mA. The power supply module includes a buck-boost conversion chip TPS63001, the first pin VIN of the buck-boost conversion chip TPS63001 is connected to the input voltage VBAT (1.8-5V) through the filter capacitor C1; the second pin VINA is connected to the power supply voltage control signal input circuit ; The third pin SYNCPS is connected to the power-saving mode control signal input circuit; the fourth pin EN is connected to the device enable signal input circuit; the ninth pin FB is the internal voltage error amplifier of the chip, which is connected to the feedback signal input circuit; the tenth pin yOUT is connected to the voltage output circuit; an isolation inductor L1 for eliminating inductor current is provided between the zeroth pin L1 and the eleventh pin L11.

To explain as an example, the pin output values of the zeroth pin L1 and the eleventh pin L11 can be calculated by the following formula:

L _L1 ＝(V _o (V ₁ -V _o ))/(0.3V ₁ f)

L _L2 ＝(V ₂ (V _o -V ₂ ))/(0.3V ₂ f)

Among them, L _L1 and L _L2 are the minimum output inductance values in buck mode and boost mode respectively, V ₁ and V ₂ are the minimum input voltage values in buck mode and boost mode respectively; V _o For the voltage output value, f is the minimum switching frequency.

As shown in FIG. 10 , the value of the isolation inductance L1 connected between the zeroth pin L1 and the eleventh pin L2 is between LL1 and LL2 .

In one embodiment of the present invention, the output voltage of the power supply module is designed to be 3.3V; in order to obtain the best control effect, in this embodiment, the inductance value of the isolation inductor L1 is selected to be 2.2 μH as the zero pin Pin 0 and The isolation inductor between the eleventh pin Pin 11.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (7)

1. A smart bracelet, characterized in that it comprises a bluetooth data communication circuit, a pedometer circuit, an electrocardiographic signal acquisition circuit, a body temperature detection circuit, a notification circuit, and a power supply circuit; Wherein the Bluetooth data communication circuit includes a DA4580 Bluetooth control chip, wherein the DA4580 Bluetooth control chip is provided with I/O pins P0_0～P0_7, pins P1_0～P1_3, and pins P2_0～P0_9 for respectively connecting the smart bracelet sensor chip; Among them, the P0_0 pin is connected to the interrupt control interface of the MPU-6050 motion processing sensor chip of the pedometer circuit, the P0_1 pin is connected to the interrupt control interface of the MPU-6050 motion processing sensor chip of the pedometer circuit, and the P0_2 pin is connected to The I2C bus serial data interface of the MPU-6050 motion processing sensor chip of the pedometer circuit, the P0_1 pin is connected to the I2C bus serial clock interface of the MPU-6050 motion processing sensor chip of the pedometer circuit; the P0_3 pin is connected to the air pressure sensor The eighth pin of the P0_4 pin is connected to the buzzer; the P0_5 pin is connected to the motor of the notification circuit; the P0_6 pin is connected to the red LED light of the notification circuit; the P0_7 pin is connected to the green LED light of the notification circuit; the P1_0 pin is connected to the LED green light of the notification circuit; The pin is connected to the LED yellow light of the notification circuit; the P1_1 pin is connected to the I2C bus serial data communication interface of the first pin of the DS1624 digital temperature sensor chip of the body temperature detection circuit; the P1_2 pin is connected to the DS1624 digital temperature of the body temperature detection circuit The I2C bus serial input clock interface of the second pin of the sensor chip; the signal output end of the fourth pin of the BMD101 ECG acquisition chip connected to the P1_3 pin of the ECG signal acquisition circuit; The reset circuit connection interface of the seventeenth pin of the DA4580 Bluetooth control chip is connected to the reset circuit, and the reset circuit includes an input voltage that provides a reset high level and a controllable switch, and the reset of the seventeenth pin The circuit connection interface is also grounded through the reset resistor; The 29th pin and the 30th pin of the DA4580 bluetooth control chip are connected to a digital control oscillator and an external crystal oscillator; The eleventh pin and the twelfth pin of the DA4580 Bluetooth control chip are connected to an RC oscillator and an external crystal oscillator; The thirty-fifth pin of the DA4580 Bluetooth control chip is connected to the antenna; The pedometer circuit includes an MPU-6050 motion processing sensor chip, the external clock input pin of the first pin of the MPU-6050 motion processing sensor chip is connected to an external clock or ground; the serial data interface of the sixth pin is connected to an external air pressure Sensor; the serial clock interface of the external air pressure sensor on the seventh pin is connected to the external air pressure sensor clock: the logic power supply voltage of the eighth pin is connected to an external logic circuit triggered by a monotonic edge, and the external logic circuit includes a fourth capacitor grounded; The power interface of the nine-pin signal group is connected to the I2C bus as the least significant bit of the slave address; the calibration filter port of the tenth pin is connected to the calibration filter capacitor; the frame synchronization data input of the eleventh pin is grounded; the interrupt of the twelfth pin The control interface is connected to the P0_0 interface of the Bluetooth communication chip; the charge pump connection interface of the 20th pin is connected to the charge pump; the I2C bus serial data interface of the 23rd pin is connected to the Bluetooth communication chip; the I2C of the 24th pin The bus serial clock interface is connected to the Bluetooth communication chip; The electrocardiographic signal acquisition circuit includes a BMD101 electrocardiographic acquisition chip and an ECG electrocardiographic acquisition circuit; wherein the electrode analog signal input interface of the first pin and the second pin of the BMD101 electrocardiographic acquisition chip is connected to a terminal for collecting electrocardiographic analog signals. Sensor; the data writing interface RX of the third pin receives data through the serial bus; the signal output interface of the fourth pin is connected to the Bluetooth communication chip to output data; the high level reset interface of the fifth pin is connected to the high level reset circuit, the high-level reset circuit includes pull-up resistors and Zener diodes connected in parallel, and the fifth pin is also grounded through a filter capacitor; Wherein the ECG electrocardiographic acquisition circuit includes a connector, and the BMD101 electrocardiographic acquisition chip is connected to a sensor for collecting electrocardiographic analog signals through the connector, wherein the fourth pin of the connector is connected to the first pin of the BMD101 electrocardiographic acquisition chip. pin, and the first pin of the connector is connected to the second pin of the BMD101 ECG acquisition chip; and the second pin and the third pin of the connector are connected to the analog ground; the first pin of the connector The four pins are connected to the analog ground through the first electrostatic discharge circuit, and the first pin is connected to the analog ground through the second electrostatic discharge circuit; Wherein the analog ground is connected to the ground through a buffer inductance; The body temperature detection circuit includes a DS1624 digital temperature sensor chip, the I2C bus serial data communication interface of the first pin of the DS1624 digital temperature sensor chip and the I2C bus serial input clock interface of the second pin are connected to the Bluetooth communication chip, and the second pin The I2C bus serial data communication interface of one pin and the I2C bus serial input clock interface of the second pin are respectively connected with a pull-up resistor; wherein the grounding interface of the fourth pin of the DS1624 digital temperature sensor chip is grounded; and the DS1624 The address input interfaces of the fourth pin, fifth pin, and sixth pin of the digital temperature sensor chip are all grounded; The notification circuit includes a buzzer circuit, a vibration motor circuit, and an LED flashing circuit; Wherein the buzzer circuit includes a buzzer and a triode, wherein the buzzer is connected in parallel with a third resistor, and is connected to the power supply circuit and the collector of the triode; the emitter stage of the triode is grounded; the base of the triode Connect the Bluetooth communication chip through a current limiting resistor, and ground through a filter capacitor; Wherein the vibration motor circuit includes a motor and an NPN triode; after the vibration motor is connected in parallel with a Zener diode, the power supply circuit and the collector of the triode are connected; and the base of the triode is connected to the Bluetooth communication chip through a current limiting resistor, and filtered The capacitor is grounded; the emitter of the triode is grounded; Wherein the LED flashing circuit includes at least one LED lamp, and the LED lamp is connected to the Bluetooth communication chip through a current limiting resistor. The power supply circuit includes a rechargeable battery, a power supply module and a charging module; wherein, The charging module includes a charging management subcircuit and a USB interface subcircuit, and the USB interface subcircuit is connected to the rechargeable battery through the charging management subcircuit; the charging management subcircuit includes a LTC4053-4.2 charging management chip, and the LTC4053 -4.2 The second pin of the current input of the charging management chip is connected to the USB interface sub-circuit, and the ninth pin is connected to the rechargeable battery; and the sixth tube of the LTC4053-4.2 charging management chip is used to determine the negative temperature coefficient The pin is grounded, the seventh pin of the LTC4053-4.2 charging management chip is connected to an external resistor for determining the charging circuit, and the fourth pin of the LTC4053-4.2 charging management chip is connected to the first capacitor for determining the charging time; Wherein the USB interface sub-circuit includes a USB interface chip, the first pin of the USB interface chip is connected to the second pin of the current input of the LTC4053-4.2 charging management chip, and grounded through the second capacitor; The power supply module includes a buck-boost conversion chip TPS63001, the first pin of the buck-boost conversion chip TPS63001 is connected to the input voltage through a filter capacitor; the second pin is connected to the power supply voltage control signal input circuit; the third pin is connected to the power supply voltage control signal input circuit; Electric mode control signal input circuit; the fourth pin is connected to the device enable signal input circuit; the ninth pin is the internal voltage error amplifier of the chip, connected to the feedback signal input circuit; the tenth pin is connected to the voltage output circuit; the zeroth pin and An isolation inductor for eliminating inductor current is provided between the eleventh pins. 2. The smart bracelet according to claim 1, wherein the fourteenth pin of the DA4580 bluetooth control chip of the bluetooth data communication circuit is grounded through the fifteenth capacitor; the fifteenth pin is grounded through the eleventh The capacitor is grounded; the nineteenth pin is grounded through the tenth capacitor; the twenty-first pin is grounded through the second inductor and the sixteenth capacitor; the twenty-third pin is grounded through the parallel connection of the fourteenth capacitor and the sixteenth capacitor ; The twenty-fifth pin and the twenty-sixth pin are connected to the external SWD interface; the thirty-first pin is grounded through the thirteenth capacitor; the thirty-eighth pin is connected to an external power supply, and grounded through the twelfth capacitor; The 35th pin of the DA4580 bluetooth control chip is grounded through the first inductance, the 16th resistor, the 9th capacitor and the 17th resistor connected in parallel; the 16th pin, the 5th pin, the 34th pin The pin and the zeroth pin are grounded. 3. The smart bracelet according to claim 1, wherein the power supply interface of the thirteenth pin of the MPU-6050 motion processing sensor chip of the step counting circuit is connected to the power supply circuit, and the voltage of the power supply circuit is 3.3V ± 0.5%; and the power supply interface of the thirteenth pin of the MPU-6050 motion processing sensor chip is grounded through the second capacitor; the logic power supply voltage of the eighth pin of the MPU-6050 motion processing sensor chip The logic power supply voltage is less than the voltage of the power supply circuit connected to the power supply interface of the thirteenth pin; the capacitance value of the calibration filter capacitor is 0.1 μF; the capacitance value of the second capacitor is 0.1 μF; the capacitance value of the charge pump is 10nF; the capacitance of the fourth capacitor is 10nF. 4. The smart bracelet according to claim 1, wherein the ECG signal acquisition circuit also includes a second socket, and the first pin of the second socket is connected to the BMD101 ECG acquisition circuit through a filter capacitor. The fifth pin of the chip, and the second pin of the second socket is a signal output port; wherein the power supply interface of the seventh pin of the BMD101 ECG acquisition chip is connected to the power supply circuit and grounded through a filter capacitor; The capacitance value of the filter capacitor of the ECG signal acquisition circuit is 10 μF; the inductance value of the buffer inductance of the ECG signal acquisition circuit is 10 μH; the resistance value of the pull-up resistor of the ECG signal acquisition circuit is 10KΩ; the BMD101 ECG acquisition circuit The sixth pin of the chip is grounded, and the zeroth pin is the chip select pin. 5. The smart bracelet according to claim 1, wherein the power supply interface of the eighth pin of the DS1624 digital temperature sensor chip of the body temperature detection circuit is connected to the power supply circuit; the I2C bus string of the first pin Both the pull-up resistor of the row data communication interface and the pull-up resistor of the I2C bus serial input clock interface of the second pin are connected to the power supply circuit. 6. The smart bracelet according to claim 1, wherein the LED flashing circuit of the notification circuit is provided with 3 LED lights, including a red LED light, a green LED light, and a yellow LED light; wherein the red LED light , LED green light, and LED yellow light are respectively connected to the Bluetooth communication chip through a current-limiting resistor; the resistance value of the current-limiting resistor of the LED flashing circuit is 1KΩ; the resistance value of the third resistor of the buzzer is 2KΩ, The resistance value of the current-limiting resistor is 4.7KΩ, and the capacitance value of the filter capacitor is 1nF; the resistance value of the current-limiting resistor of the vibration motor circuit is 100Ω. 7. The smart bracelet according to claim 1, the two data pins of the USB interface chip of the power supply circuit are respectively connected to the first pin of the power supply through a resistor, and are grounded respectively through a resistor; the LTC4053-4.2 charges The resistance of the external resistor connected to the seventh pin of the management chip is 15KΩ; the rechargeable battery is a SUN 452535 rechargeable lithium battery; the output voltage of the power supply module is 3.3V; the inductance of the isolation inductor is 2.2μH .