CN111934706B

CN111934706B - Wisdom bracelet

Info

Publication number: CN111934706B
Application number: CN202010765847.4A
Authority: CN
Inventors: 王强; 张腾宇; 刘颖; 李增勇
Original assignee: National Research Center for Rehabilitation Technical Aids
Current assignee: National Research Center for Rehabilitation Technical Aids
Priority date: 2018-07-13
Filing date: 2018-07-13
Publication date: 2022-02-15
Anticipated expiration: 2038-07-13
Also published as: CN111934706A; CN108832953A; CN108832953B

Abstract

The invention discloses a circuit for a smart bracelet, which comprises a main controller circuit, a Bluetooth module, a gravity sensor, a memory card, a USB interface circuit and a power supply processing circuit, and is characterized in that: the gravity sensor is connected with the Bluetooth module, and the Bluetooth module and the storage card are connected with the main controller circuit; the USB interface circuit is connected with the main controller circuit and the power supply processing circuit; the power supply processing circuit is connected with the main controller circuit. The invention provides guidance and intervention such as home health care, accidental risk prevention and alarming for the patient, and improves the safety of home rehabilitation service of the patient.

Description

Wisdom bracelet

The application is a divisional application of patent application with the application number of ' 201810766748.0 ', the application date of ' 2018, 7 and 13 months and the invention name of ' a smart bracelet for monitoring limb activity information '.

Technical Field

The invention relates to a smart bracelet, in particular to a smart bracelet for monitoring limb activity information.

Background

As a special patient group, patients with stroke need to monitor multiple information such as health, exercise and daily life capacity in the rehabilitation process. Therefore, the cloud big data management and analysis platform is constructed, the activity habits and the care requirements of patients and care personnel are deeply researched, the intelligent bracelet based on the Internet of things is developed in a matching way, the limb information of the healthy side and the affected side of the patient is recorded, the informatization of monitoring, care and rehabilitation is realized, the daily activities of the patient can be easily detected and subjected to rehabilitation evaluation intervention means and online interactive management by doctors, the guidance and intervention such as home health care, accidental risk prevention and alarming are provided for the patient, and the safety of the home rehabilitation service of the patient is improved.

Disclosure of Invention

In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose:

the utility model provides a circuit for wisdom bracelet, includes main control unit circuit, bluetooth module, gravity sensor, storage card, USB interface circuit, power processing circuit, wherein: the gravity sensor is connected with the Bluetooth module, and the Bluetooth module and the storage card are connected with the main controller circuit; the USB interface circuit is connected with the main controller circuit and the power supply processing circuit; the power supply processing circuit is connected with the main controller circuit; wherein the content of the first and second substances,

the Bluetooth module is used for communicating with the outside; the gravity sensor is used for detecting the change of the acceleration force, sending the detected detection data to the Bluetooth module, transmitting the detection data to the main controller circuit by the Bluetooth module, and storing the detection data in the memory card; the main controller circuit is used for controlling the whole work of the smart bracelet; the battery is used for supplying power; the USB interface circuit is used for being connected with the external devices or the USB charger, providing power and transmitting data; the power supply processing circuit is used for charging the battery and performing switch triggering control.

The circuit of (a), wherein: the USB interface circuit comprises a USB interface U2, wherein pin 1 of U2 is connected with an external circuit bus voltage VBUS; pin 1 is also connected with one end of a capacitor C3, and the other end of C3 is grounded; pin 2 and pin 3 of U2 are connected with the simulation interface connection end of the main controller circuit respectively; pin 4 of U2 is floating and pin 5 is grounded.

The circuit of (a), wherein: the power supply processing circuit comprises a charging chip U3, a battery, a PNP triode Q1, an NPN triode Q2, a touch switch S1, a diode D1, a diode D2, a resistor R1, a resistor R3, a resistor R4 and a resistor R5.

The circuit of (a), wherein: pin 1 of U3 is connected to pin 5 of main controller U4, pin 2 is grounded, pin 3 is connected to the positive electrode of battery and emitter of Q1 and one end of R1; a collector of the Q1 is connected with a VQ1 end to provide a comparison voltage, a base of the Q1 is connected with the other end of the resistor R1 and one end of the resistor R3, the other end of the R3 is connected with an anode of the diode D2 and a collector of the NPN triode Q2, a cathode of the diode D2 and a cathode of the diode D1 are connected together and are commonly connected with one end of the touch switch S1, and the other end of the S1 is grounded; the positive electrode of the D1 is connected with a PA4 pin 1 of the main controller; the emitter of the triode Q2 is grounded, a resistor R5 is connected between the base and the emitter, the base is connected with one end of a resistor R4, the other end of the resistor R4 is connected with a PA5 pin 3 of a main controller U4, and the emitter of the Q2 is grounded.

The circuit of (a), wherein: and a normally closed switch is arranged between the resistor R2 and the ground and is used for controlling the on-off of the resistor R2 and the ground.

The circuit of (a), wherein: the power supply processing module also comprises a power supply conversion circuit, wherein the power supply conversion circuit comprises a voltage stabilizing chip U3, a pin 1 of U3 is connected with a VQ1 end and is connected with one end of a capacitor C1, and the other end of C1 is grounded; pin 2 ground of U3; the U3 pin 3 is connected with the VQ1 end; pin 4 of U3 is connected with one end C4 of capacitor C4 and the other end is grounded; pin 5 of U3 is used as the voltage output terminal and is connected to one end of filter capacitor C2, and the other end of C2 is grounded.

The circuit of (a), wherein: the main controller circuit comprises a main controller chip U4, wherein

pins

1 and 3 of U4 are respectively connected with the anode of D1 and one end of R4; pin 6 of U4, i.e. pin 5 and pin 15 of U1) is grounded, one end of a resistor R10 is connected to 3.3V voltage, the other end is connected to pin 8 of U4, one end of a capacitor C14 is grounded, and the other end is connected to pin 8 of U4; pin 2 of the U4 is connected with the positive pole of the second battery, and the negative pole of the second battery is grounded.

The circuit of (a), wherein: the main controller circuit also comprises a display module, wherein a pin 4 of U4 is connected with one end of a resistor R6, the other end of R6 is connected with a photodiode, and the other end of the photodiode is grounded.

A smart bracelet comprising a circuit as described above.

Drawings

FIG. 1 is a schematic diagram of a circuit system of a smart bracelet for monitoring limb movement information;

FIG. 2 is a schematic diagram of a USB interface circuit;

FIG. 3 is a schematic diagram of a switch trigger circuit;

FIG. 4 is a schematic diagram of a power conversion circuit;

fig. 5 is a schematic diagram of the connection between the main controller and the USB interface circuit, the switch trigger circuit and the power conversion circuit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 shows a circuit structure diagram of a smart band of the present invention, which includes a main controller circuit, a Bluetooth module, a gravity sensor (such as LIS3DH), a TF card, and a power management module.

The above circuits are described below with reference to fig. 2-5, respectively.

The bluetooth module can select a powerful, highly flexible multi-protocol SoC, such as nRF51822, which can be suitable for bluetooth low power consumption and 2.4GHz wireless applications. The SoC is a microprocessor based on ARM Cortex M0 as a core, and has 256KB/128KB on-chip FLASH memory space and 32KB/16KB RAM space. The chip supports BLE4.0 and integrates a radio frequency transmitting circuit, and is very suitable for being applied to wearable equipment. The nRF51822 is responsible for communicating with the gravity acceleration sensor while processing the BLE4.0 protocol stack, and processing the gravity acceleration information, and can communicate with the outside under the control of the main controller chip, and receive or transmit information such as detection data.

The gravity sensor is used for sensing the change of an acceleration force, the acceleration force is the force acted on an object in the acceleration process, such as various movement changes of shaking, falling, rising, falling and the like can be converted into electric signals, and then the functions with good program design can be realized after the calculation and analysis of the microprocessor. The detection data detected by the gravity sensor is sent to the Bluetooth module, transmitted to the main controller circuit by the Bluetooth module and stored in the memory card.

Fig. 2 shows a USB interface circuit according to the present invention. The U2 is an interface for connecting USB, and is used to connect with peripheral devices such as a computer and a USB charger, and to supply power to the power processing module and data to the main controller or to obtain data from the main controller. The VBUS end (pin 1) is used as a voltage input end and connected with an external circuit bus voltage VBUS, the VBUS voltage is provided by an external device such as a USB interface of a computer or a USB charger and is generally +5V voltage, and the VBUS is also connected with a capacitor C3 and is used for high-frequency filtering, so that the filtering and decoupling effects are achieved, and high-frequency noise is eliminated. The capacitance of C3 is 2.2 μ F, and the other end of C3 is grounded. The D- (DM) end (pin 2) is connected with the SWDIO end of the main controller circuit; the D + (DM) terminal (pin 3) is connected with the SWCLK terminal of the main controller circuit, and SWDIO and SWCLK are simulation interface connection terminals and are used for writing programs into the main controller chip U4. The ID terminal (pin 4) is suspended, and the GND (pin 5) is grounded.

As shown in fig. 3, the power switch circuit with charging function (i.e. the power processing circuit in fig. 1) of the present invention provides battery charging and switch triggering functions.

The power supply processing circuit comprises a charging chip U3, the chip can select TP4054, the chip is a linear lithium ion battery charging chip, and pins of the chip are connected as follows: /CHRG (pin 1): this pin is an open drain charge state output connected to the CHRG terminal (pin 5) of the main controller U4.

The pin 7 is detected in a state where the pin 5 outputs a high level, and is in a charging state if the pin 7 is low, and indicates that charging is completed if the pin 7 is high. When the battery power is insufficient, the/CHRG (pin 1) of the TP4054 sends a low level signal to a CHRG end (pin 5) of the main controller; in the process of charging the battery BAT1, pin 5 of the main controller is in an output state and sends out a charging signal, and pin 7 is in an input state and is used for detecting a feedback signal of a CHRG end; when the battery is fully charged,/CHRG (pin 1) signals a high on pin 5 of the main controller.

The Timer3 of the main controller detects the charging state of pin 5, the Timer3 sets the interrupt time to 1 second, and the charging state detection is performed every 2 seconds.

GND (pin 2): grounding;

BAT (pin 3): and the charging current output end is connected with the positive electrode of the battery BAT1, the emitter of the PNP triode Q1 and one end of a resistor R1 of 10K ohms. The collector of Q1 is connected with VQ1 end and provides comparison voltage, the base of Q1 is connected with the other end of R1 resistance and one end of 3K ohm resistance R3, the other end of R3 is connected with the positive pole of diode D2 (optional 1N4148) and the collector of NPN triode Q2, the negative pole of diode D2 and the negative pole of diode D1 (optional 1N4148) are connected together and connected to one end of touch switch S1, and the other end of S1 is grounded. The positive pole of D1 is connected to the PA4 pin of the main controller. The emitter of the triode Q2 is grounded, a resistor R5 is connected between the base and the emitter, the base is connected with one end of a resistor R4, the resistance values of R4 and R5 are 5.1K ohm and 10K ohm respectively, the other end of R4 is connected with a PA5 pin of the main controller, and the emitter of Q2 is grounded. The pin PA4 is used for the main controller to detect whether S1 is closed or not, and the pin PA5 is used for the main controller to send out control signals to control the Q1 and the Q2 to be conducted.

In operation, the BAT (pin 3) provides a charging current to the battery and regulates the final float voltage to 4.2V. U3 sets the float voltage through a precision internal resistor divider that is turned off during shutdown mode.

VCC (pin 4): a positive input supply voltage terminal. This pin (pin 4) supplies power to the TP4054 chip. The VCC varies from 4.25V to 6.5V. When VCC drops to within 30mV higher than BAT pin voltage and less than difference, TP4054 enters shutdown mode, thereby causing battery charging current I_BATReduce to below 2 muA. To protect the rechargeable battery, TP4054 stops when VCC falls below BAT (pin 3) voltage by more than 30 mV. This pin (pin 4) is connected to the bus voltage VBUS.

PROG (pin 5): this pin is the charging current setting, charging current monitoring and shutdown pin. A resistor R2 with the accuracy of 1% is connected between the pin and the ground, the resistance value of R2 is 10K ohms, and the charging current can be determined, and is 1000 times of the output current of the PROG pin. When charging in constant current mode, the voltage of the pin is maintained at 1V, i.e., V_R2The approximate value is 1V. The voltage on the pin can be used to calculate the charging current in all modes, I_BATIndicating that the voltage at pin 5 is V_R2Expressed, then there is the formula: i is_BAT＝V_R2The ratio of/R2 is 1000. Therefore, I_BAT＝1V/10KΩ×1000＝0.1A＝100mA。

A normally closed switch can be arranged between the resistor R2 and the ground and used for controlling the on-off of the resistor R2 and the ground, when the normally closed switch is pressed, the resistor R2 is disconnected with the ground, and the PROG pin 5 is at a high level; when the PROG pin voltage reaches 1.22V of the TP4054 internal reference voltage, the TP4054 stops working; TP4054 resumes operation when resistor R2 resumes connection to ground.

In fig. 3, in the power-off state (power-off state), the switches S1 are pressed, S1 is closed, the base of PNP transistor Q1 (connected to ground through resistor R3, diode D2 and S1) is pulled low, the emitter and collector of transistor Q1 are turned on, and thus battery BT1 supplies power to the power conversion circuit through VQ1 terminal after passing through transistor Q1, and the main controller enters the working state. The main controller runs a program after power supply is started, pulls a pin PA5 high during initialization, and a triode Q2 is conducted, so that the base of the triode Q1 (grounded after R3 and Q2) is pulled low all the time, and even if S1 is disconnected, the base of the triode Q1 is ensured to be at a low level, so that the Q1 is also conducted all the time, and the power supply conversion circuit keeps a power supply state.

When the power-on state is started, S1 is pressed, S1 is closed, then pin PA4 of the main controller detects a low level through diode D1, at this time, the main controller sets PA5 to a low level, transistor Q2 is turned off, after S1 is turned off, the base of transistor Q1 is pulled up to a high level by resistor R1, so that the base of Q1 cannot maintain the low level, Q1 is turned off, the power supply state of the power supply conversion circuit is maintained, and the power supply of the main controller is turned off.

The emitter of Q1 is 4.2V during charging, this 4.2V is provided by U3(TP4054), and the corresponding collector voltage during charging is also 4.2V, although the PN junction has a voltage drop, which is not a concern because it is small, so the voltage at the emitter of Q1 is the battery voltage when no charging is taking place, and the collector is the output voltage of the battery.

The circuit realizes the one-key power-on and power-off function, a pin PA4 of the main controller is configured to be a pull-up input, a pin PA5 is configured to be an output mode, and after power-on initialization, the pin PA5 is set to be high level, so that the conduction of the Q1 is ensured. The input of PA4 is detected in Timer5 in the main controller, the Timer5 is 1 second, the main controller is turned on at S1 for one second,

the PA5 is set to low level for power-off after the key is pressed for 5 seconds, that is, power-off is performed after the key is pressed for about 5 seconds in S1, or power-off is performed after the key is pressed for a certain time by adjusting the delay time program. Both power on and power off may be indicated by an LED.

The power processing module further comprises a power conversion circuit, as shown in fig. 4, which is a power conversion circuit, wherein,

u1 is a voltage stabilization chip, and can select RT9193, pin IN (pin 1) is an input end, is connected with VQ1 end and is connected with one end of a capacitor C1, C1 is a decoupling capacitor and is used for filtering high-frequency disturbance, the capacitance value of C1 is 2.2 muF, and the other end of C1 is grounded.

GND (pin 2) is a ground terminal and is grounded.

EN (Pin 3) is a chip enable terminal, is active high, and is directly connected with a VQ1 terminal, namely a VQ1 terminal is used as an enable terminal of the chip.

BP (pin 4) is a reference noise bypass terminal, and is connected to one terminal of a capacitor C4, the capacitance of C4 is 470pF, and the other terminal of C4 is grounded.

OUT (pin 5) is an output end, outputs 3.3V voltage, is connected with one end of a filter capacitor C2, the capacitance value of C2 is 2.2 muF, and the other end of C2 is grounded.

RT9193 has extremely low noise and static current consumption, and even if the RT9193 works in a through state, the current consumption is slightly increased, and the service life of the battery can be effectively prolonged. It can work stably with low ESR ceramic capacitance cooperation, and is extremely low to the space demand, and this is vital to small-size wireless application. The RT9193 only consumes less than 0.01 μ A of current in shutdown mode and the start-up procedure is shorter than 50 μ s long. It has extremely low voltage difference, high output voltage precision, current limit protection and high ripple rejection ratio. When the voltage VQ1 is input to the pin IN (pin 1) and the pin EN (pin 3) is enabled, the U1 starts to work, the pin OUT (pin 5) of the U1 outputs 3.3V voltage, and the circuit outputs stable 3.3V voltage to supply power to the main controller.

As shown in fig. 5, the main controller circuit includes a main controller chip U4 (e.g., STM32F103) and its peripheral circuits, and is connected to the USB interface circuit, the switch trigger circuit, and the power conversion circuit: pins PA4 and PA5 of U4 are connected to corresponding numbered pins in fig. 3, CHRG is connected to corresponding pins of the U4 chip, and SWDIO and SWCLK are connected to corresponding numbered pins in fig. 2. SWDIO and SWCLK of the U4 chip are emulation interface connectors for programming the U4 chip.

A power supply end (pin 6) of U4 is connected with 3.3V voltage (namely pin 5 of U1), a ground end (pin 15) is grounded GND, a NRST end pin 8 is connected with an asynchronous reset circuit consisting of a 3.3V power supply, Ground (GND), R10 and C14, R10 is a resistor with the resistance value of 10K ohms, C14 is a capacitor with the capacitance value of 0.1 muF, one end of R10 is connected with 3.3V voltage, and the other end is connected with NRST; one end of the C14 is grounded, the other end is connected with NRST, and the NRST is connected with the asynchronous reset pin 8 of the U4. NRST (pin 8) is a power-on reset, that is, at the moment when the power is turned on, since the voltage of the capacitor cannot suddenly change, the voltage on both sides of the capacitor is zero, NRST is reset, and the capacitor is charged with time, and the reset fails. When NRST is low, U4 is in reset, resetting all internal registers. When reset, the RTC's registers and backing store in U4 are not reset because they are powered by the battery BT2 via a dedicated VBAT pin. The VBAT terminal pin 2 is connected with the anode of a Battery BT2 Battery, the cathode of the Battery is grounded, and the Battery is used for supplying power to a clock circuit RTC of a U4 chip, so that the internal clock of the Battery is accurate in time running.

The display module is connected as follows: the PA8_ LED of the U4 is connected with an indicating circuit consisting of R6 and a photodiode play, one end of the R6 is connected with the PA8_ LED, the other end of the R6 is connected with the anode of the photodiode play, and the cathode of the other end of the R6 is grounded. The LED display lamp is released for starting up after being pressed for about 1 second in a shutdown state, an LED indicator lamp (photodiode) on equipment flashes once for 2 seconds under the control of U4 after starting up, and the rhythm of flashing once for 2 seconds is kept in a normal working state; and the LED indicator lamp enters a power-off state after being released for 2 seconds in the power-on state, and the LED indicator lamp on the board is in an off state in the power-off state.

It should be noted that the charging indication is performed only by pressing the power key S1 when the charging is performed in the power-off state, and the LED is turned on every 500ms during the charging process, that is, the LED is uniformly turned on and off every second. The LED lamp will resume the rhythm of flashing once in 2 seconds after being fully charged.

When the intelligent bracelet with the circuit works, the number of steps of walking on the healthy limb side of a patient, the height of going upstairs and downstairs, the walking mileage and the like can be estimated by a main controller chip through signals obtained by detecting an accelerometer, and the limb movement condition of the affected side of the patient can also be detected; the TF card may be used to record location information, activity status information, etc. The intelligent monitoring of the limb activities of the patient is realized through the detection and processing of the data.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a wisdom bracelet, is including the circuit that is used for wisdom bracelet, the circuit includes main control unit circuit, bluetooth module, gravity sensor, storage card, USB interface circuit, power processing circuit, its characterized in that: the gravity sensor is connected with the Bluetooth module, and the Bluetooth module and the storage card are connected with the main controller circuit; the USB interface circuit is connected with the main controller circuit and the power supply processing circuit; the power supply processing circuit is connected with the main controller circuit; wherein the content of the first and second substances,

the Bluetooth module is used for communicating with the outside; the gravity sensor is used for detecting the change of the acceleration force, sending the detected detection data to the Bluetooth module, transmitting the detection data to the main controller circuit by the Bluetooth module, and storing the detection data in the memory card; the main controller circuit is used for controlling the whole work of the smart bracelet; the battery is used for supplying power; the USB interface circuit is used for being connected with a peripheral or a USB charger, providing power and carrying out data transmission; the power supply processing circuit is used for charging the battery and performing switch triggering control;

the power supply processing circuit comprises a charging chip U3, a battery, a PNP triode Q1, an NPN triode Q2, a touch switch S1, a diode D1, a diode D2, a resistor R1, a resistor R3, a resistor R4 and a resistor R5, wherein: u3 selects TP4054, pin 1 of U3 is connected to pin 5 of U4 of the main controller, pin 2 is grounded, pin 3 is connected with the positive electrode of the battery, the emitter of Q1 and one end of R1; a collector of the Q1 is connected with a VQ1 end, a base of the Q1 is connected with the other end of the resistor R1 and one end of the resistor R3, the other end of the R3 is connected with an anode of the diode D2 and a collector of the NPN triode Q2, a cathode of the diode D2 and a cathode of the diode D1 are connected together and are commonly connected to one end of the touch switch S1, and the other end of the S1 is grounded; the positive electrode of the D1 is connected with a PA4 pin 1 of the main controller; the emitter of the triode Q2 is grounded, a resistor R5 is connected between the base and the emitter, the base is connected with one end of a resistor R4, the other end of the resistor R4 is connected with a PA5 pin 3 of a main controller U4, and the emitter of Q2 is grounded;

the main controller circuit comprises a main controller chip U4, an STM32F103 is selected as U4, and pins 1 and 3 of U4 are respectively connected with the anode of D1 and one end of R4; pin 6 of U4, namely pin 5 of U1, U1 is a voltage stabilizing chip, and RT9193 is selected; the pin 15 is grounded, one end of the resistor R10 is connected with 3.3V voltage, the other end is connected with the pin 8 of U4, one end of the capacitor C14 is grounded, and the other end is connected with the pin 8 of U4; pin 2 of the U4 is connected with the positive pole of the second battery, and the negative pole of the second battery is grounded.

2. The smart bracelet of claim 1, wherein: the USB interface circuit comprises a USB interface U2, wherein pin 1 of U2 is connected with an external circuit bus voltage VBUS; pin 1 is also connected with one end of a capacitor C3, and the other end of C3 is grounded; pin 2 and pin 3 of U2 are connected with the simulation interface connection end of the main controller circuit respectively; pin 4 of U2 is floating and pin 5 is grounded.