Indoor personnel lightweight tracking circuit based on low power bluetooth

Abstract

The utility model discloses an indoor personnel lightweight tracking circuit based on low power consumption bluetooth, through with bluetooth module as the core, collocating conventional low -cost component, need not professional disposition, greatly reduce cost and implementation difficulty, solve the problem of high cost of UWB, popularization difficult, combine each circuit low -power consumption design, prolong equipment endurance, solve the problem of high power consumption of UWB, through antenna circuit and conventional bluetooth gateway communication, cross brand, cross system compatibility is strong, solve the problem of poor compatibility of UWB, integrate bluetooth module, infrared receiver, acceleration sensor and so on multi -circuit, form positioning, detection, remind, interactive complete tracking closed loop, satisfy indoor lightweight tracking demand.

Description

Technical Field

[0001] This utility model belongs to the field of tracking equipment technology, specifically relating to a lightweight indoor people tracking circuit based on Bluetooth Low Energy. Background Technology

[0002] The demand for lightweight, low-cost, long-lasting, and easy-to-deploy tracking solutions is increasingly urgent in current indoor people tracking scenarios (such as monitoring elderly and children at home, personnel management in small office areas, and visitor tracking in small commercial venues). However, existing indoor people tracking technologies have many key technical problems: On the one hand, mainstream UWB-based indoor tracking solutions have significantly high hardware costs. UWB chips require high-precision timestamps and multi-antenna array designs, which are expensive. The supporting UWB base stations, tags, and other hardware equipment are also expensive and require professional technicians for deployment and debugging, resulting in high overall implementation costs and making it difficult to popularize in ordinary consumer scenarios or small venues. On the other hand, UWB devices have high power consumption and require frequent external power supply or battery replacement during continuous operation, which cannot meet the long-lasting battery life requirements of lightweight tracking devices. Furthermore, the standardization process of UWB technology is slow, and different manufacturers have different interpretations and implementations of the standard. The lack of uniformity in hardware design and software protocol stacks leads to poor compatibility between different brands of UWB devices, making it difficult for them to work together across brands and systems, thus limiting their applicability. In addition, some indoor tracking solutions based on Wi-Fi or RFID either suffer from excessive power consumption and insufficient positioning accuracy, or have limited functionality, only achieving basic positioning and lacking auxiliary functions such as boundary crossing alerts and personnel movement status detection (e.g., static / accelerated judgment). Furthermore, the circuit design between functional modules is scattered and lacks coordination, with chaotic power supply and signal transmission logic, making it impossible to form a complete tracking closed loop. At the same time, the poor stability of the equipment further affects the reliability of tracking, making it difficult to meet the actual needs of lightweight indoor personnel tracking. Utility Model Content

[0003] In view of this, the main objective of this utility model is to provide a lightweight indoor people tracking circuit based on Bluetooth Low Energy.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] This utility model embodiment provides a lightweight indoor personnel tracking circuit based on Bluetooth Low Energy, including a Bluetooth module, a battery, an antenna circuit, an infrared receiver circuit, a vibration motor circuit, a button circuit, an indicator light circuit, and an accelerometer sensor circuit. The battery powers the Bluetooth module. The Bluetooth module is communicatively connected to the infrared receiver circuit and the accelerometer sensor circuit. The signal output terminal of the Bluetooth module is connected to the signal input terminal of the vibration motor circuit and the signal input terminal of the indicator light circuit. The signal output terminal of the button circuit is connected to the signal input terminal of the Bluetooth module. The Bluetooth module communicates with a Bluetooth gateway through the antenna circuit.

[0006] In the above scheme, the Bluetooth module includes a Bluetooth chip, a second metal capacitor, a sixteenth metal capacitor, and a sixth metal capacitor. The power output terminal of the battery is connected to the VDD terminal of the Bluetooth chip, the first terminal of the second metal capacitor, the first terminal of the sixteenth metal capacitor, and the first terminal of the sixth metal capacitor, respectively. The second terminals of the second metal capacitor, the sixteenth metal capacitor, and the sixth metal capacitor are all grounded.

[0007] In the above scheme, the antenna circuit includes a first multilayer inductor, a second multilayer inductor, a twelfth metal capacitor, a thirteenth metal capacitor, a fifteenth metal capacitor, and an eighteenth metal capacitor. The first end of the first multilayer inductor is connected to the first end of the twelfth metal capacitor and the ANT terminal of the Bluetooth chip. The second end of the first multilayer inductor is connected to the first end of the second multilayer inductor, the first end of the thirteenth metal capacitor, and the first end of the fifteenth metal capacitor. The second end of the second multilayer inductor is connected to the first end of the eighteenth metal capacitor and the antenna and then grounded. The second end of the thirteenth metal capacitor is connected to the second ends of the fifteenth and eighteenth metal capacitors and then grounded. The second end of the twelfth metal capacitor is grounded.

[0008] In the above scheme, the infrared receiver circuit includes an infrared receiver, a fourth resistor, a fifth resistor, a seventh resistor, a fourteenth metal capacitor, a seventh bidirectional diode, and an eighth bidirectional diode. The GND terminal of the infrared receiver is connected to the first terminal of the fourteenth metal capacitor, the first terminal of the seventh bidirectional diode, and the first terminal of the eighth bidirectional diode, respectively, and then grounded. The VS terminal of the infrared receiver is connected to the second terminal of the fourteenth metal capacitor, the first terminal of the fourth resistor, the first terminal of the fifth resistor, the first terminal of the eighth bidirectional diode, and the power output terminal of the battery, respectively. The second terminal of the fourth resistor is connected to the P0.04 terminal of the Bluetooth chip. The OUT terminal of the infrared receiver is connected to the second terminal of the seventh bidirectional diode and the first terminal of the seventh resistor, respectively. The second terminal of the seventh resistor is connected to the second terminal of the fifth resistor and the P0.05 terminal of the Bluetooth chip, respectively.

[0009] In the above scheme, the vibration motor circuit includes a first ferrite bead, a first capacitor, a second capacitor, a second diode, a motor, a first transistor, a second resistor, and a third resistor. The power output terminal VCC of the battery is connected in series with the first ferrite bead and then connected to the first terminal of the first capacitor, the first terminal of the second capacitor, the first terminal of the second diode, and the first terminal of the motor. The second terminal of the first capacitor is grounded. The second terminal of the second capacitor is connected to the second terminal of the second diode, the second terminal of the motor, and the emitter of the first transistor. The base of the first transistor is connected to the first terminal of the second resistor and the first terminal of the third resistor. The second terminal of the third resistor is connected to the collector of the first transistor and then grounded. The second terminal of the second resistor is connected to the P0.16 terminal of the Bluetooth chip.

[0010] In the above scheme, the button circuit includes a switch, a sixth capacitor, a sixth bidirectional diode, and a tenth resistor. The power output terminal VCC of the battery is connected in series with the tenth resistor and then connected to the first terminal of the sixth capacitor, the first terminal of the sixth bidirectional diode, the first terminal of the switch, and the P0.23 terminal of the Bluetooth chip. The second terminal of the sixth bidirectional diode is connected to the second terminal of the sixth capacitor and the second terminal of the switch and then grounded.

[0011] In the above scheme, the indicator light circuit includes a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, a first resistor, a ninth resistor, a third bidirectional diode, a fourth bidirectional diode, and a fifth bidirectional diode. The power output terminal of the battery is connected to the positive terminals of the first light-emitting diode, the second light-emitting diode, and the third light-emitting diode, respectively. The negative terminal of the first light-emitting diode is connected in series with the first resistor and then connected to the P0.29 terminal of the Bluetooth chip and the first terminal of the third bidirectional diode, respectively. The negative terminal of the second light-emitting diode is connected in series with the eighth resistor and then connected to the P0.28 terminal of the Bluetooth chip and the first terminal of the fourth bidirectional diode, respectively. The negative terminal of the third light-emitting diode is connected in series with the ninth resistor and then connected to the P0.30 terminal of the Bluetooth chip and the first terminal of the fifth bidirectional diode, respectively. The second terminals of the third bidirectional diode, the fourth bidirectional diode, and the fifth bidirectional diode are all grounded.

[0012] In the above scheme, the accelerometer circuit includes an accelerometer, a second ferrite bead, a first current resistor, a second current resistor, a third current resistor, a fourth current resistor, a fifth current resistor, a sixth current resistor, a seventh current resistor, a second metal capacitor, a third metal capacitor, and a first metal capacitor. The power output terminal of the battery is connected via the second ferrite bead to the VDD terminal of the accelerometer, the VDD_IO terminal of the accelerometer, the first terminal of the first current resistor, the first terminal of the first metal capacitor, the first terminal of the second metal capacitor, the first terminal of the third metal capacitor, the first terminal of the fourth current resistor, the first terminal of the fifth current resistor, the first terminal of the sixth current resistor, and the first terminal of the seventh current resistor. The second terminal of the first current resistor is connected to the ADC2 terminal of the accelerometer, and the first terminal of the second current resistor is connected to the ADC1 terminal of the accelerometer. The first, second, and third metal capacitors are all grounded. The first terminal of the third current resistor is connected to the ADC3 terminal of the accelerometer. The second terminal of the third current resistor is connected to the GND terminal and the RES terminal of the accelerometer and then grounded. The second terminal of the fourth current resistor is connected to the CS terminal of the accelerometer. The second terminal of the fifth current resistor is connected to the SDO / SA0 terminal of the accelerometer. The second terminal of the sixth current resistor is connected to the SDA / SDI / SDO terminal of the accelerometer. The second terminal of the seventh current resistor is connected to the SCL / SPC terminal of the accelerometer. The INT1 terminal of the accelerometer is connected to the P0.07 terminal of the Bluetooth chip. The INT2 terminal of the accelerometer is connected to the P0.08 terminal of the Bluetooth chip.

[0013] Compared with existing technologies, this utility model uses a Bluetooth module as the core, combined with conventional low-cost components, requiring no professional deployment, significantly reducing costs and implementation difficulty, and solving the problems of high cost and difficulty in popularization of UWB. Combined with the low power consumption design of each circuit, it extends the device's battery life and solves the problem of high power consumption of UWB. It communicates with conventional Bluetooth gateways through antenna circuits, with strong cross-brand and cross-system compatibility, solving the problem of poor UWB compatibility. It integrates multiple circuits such as Bluetooth module, infrared receiver, and accelerometer to form a complete tracking closed loop of positioning, detection, reminder and interaction, meeting the needs of lightweight indoor tracking. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1This is a schematic diagram of the structure of a lightweight indoor people tracking circuit based on Bluetooth Low Energy, as described in an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of the Bluetooth module described in an embodiment of the present utility model;

[0017] Figure 3 This is a schematic diagram of the antenna circuit described in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the infrared receiver circuit described in an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the vibration motor circuit described in an embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the key circuit described in an embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the indicator light circuit described in an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the acceleration sensor circuit described in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0026] This utility model embodiment provides a lightweight indoor people tracking circuit based on Bluetooth Low Energy, such as... Figures 1-8 As shown, the device includes a Bluetooth module, a battery, an antenna circuit, an infrared receiver circuit, a vibration motor circuit, a button circuit, an indicator light circuit, and an accelerometer sensor circuit. The battery powers the Bluetooth module. The Bluetooth module is communicatively connected to both the infrared receiver circuit and the accelerometer sensor circuit. The signal output terminal of the Bluetooth module is connected to the signal input terminal of both the vibration motor circuit and the indicator light circuit. The signal output terminal of the button circuit is connected to the signal input terminal of the Bluetooth module. The Bluetooth module communicates with a Bluetooth gateway through the antenna circuit.

[0027] like Figure 1 and Figure 2 As shown, the Bluetooth module includes a Bluetooth chip MU1, a second metal capacitor MC2, a sixteenth metal capacitor MC16, and a sixth metal capacitor MC6. The power output terminal VCC of the battery is connected to the VDD terminal of the Bluetooth chip MU1, the first terminal of the second metal capacitor MC2, the first terminal of the sixteenth metal capacitor MC16, and the first terminal of the sixth metal capacitor MC6, respectively. The second terminals of the second metal capacitor MC2, the sixteenth metal capacitor MC16, and the sixth metal capacitor MC6 are all grounded.

[0028] like Figure 2 and Figure 3As shown, the antenna circuit includes a first multilayer inductor ML1, a second multilayer inductor ML2, a twelfth metal capacitor MC12, a thirteenth metal capacitor MC13, a fifteenth metal capacitor MC15, an eighteenth metal capacitor MC18, and an antenna Antenna. The first terminal of the first multilayer inductor ML1 is connected to the first terminal of the twelfth metal capacitor MC12 and the ANT terminal of the Bluetooth chip MU1. The second terminal of the first multilayer inductor ML1 is connected to the first terminals of the second multilayer inductor ML2, the thirteenth metal capacitor MC13, and the fifteenth metal capacitor MC15. The second terminal of the second multilayer inductor ML2 is connected to the first terminal of the eighteenth metal capacitor MC18 and the antenna Antenna and then grounded. The second terminal of the thirteenth metal capacitor MC13 is connected to the second terminals of the fifteenth metal capacitor MC15 and the eighteenth metal capacitor MC18 and then grounded. The second terminal of the twelfth metal capacitor MC12 is grounded.

[0029] like Figure 2 and Figure 4 As shown, the infrared receiver circuit includes an infrared receiver U1, a fourth resistor R4, a fifth resistor R5, a seventh resistor R7, a fourteenth metal capacitor MC14, a seventh bidirectional diode D7, and an eighth bidirectional diode D8. The GND terminal of the infrared receiver U1 is connected to the first terminal of the fourteenth metal capacitor MC14, the first terminal of the seventh bidirectional diode D7, and the first terminal of the eighth bidirectional diode D8, and then grounded. The VS terminal of the infrared receiver U1 is connected to the second terminal of the fourteenth metal capacitor MC14, the first terminal of the fourth resistor R4, the first terminal of the fifth resistor R5, the second terminal of the eighth bidirectional diode D8, and the power output terminal VCC of the battery. The second terminal of the fourth resistor R4 is connected to the P0.04 terminal of the Bluetooth chip MU1. The OUT terminal of the infrared receiver U1 is connected to the second terminal of the seventh bidirectional diode D7 and the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is connected to the second terminal of the fifth resistor R5 and the P0.05 terminal of the Bluetooth chip MU1.

[0030] like Figure 2 and Figure 5As shown, the vibration motor circuit includes a first ferrite bead FB1, a first capacitor C1, a second capacitor C2, a second diode D2, a motor M3, a first transistor Q1, a second resistor R2, and a third resistor R3. The power output terminal VCC of the battery is connected in series with the first ferrite bead FB1 and then connected to the first terminal of the first capacitor C1, the first terminal of the second capacitor C2, the first terminal of the second diode D2, and the first terminal of the motor M3. The second terminal of the first capacitor C1 is grounded. The second terminal of the second capacitor C2 is connected to the second terminal of the second diode D2, the second terminal of the motor M3, and the emitter of the first transistor Q1. The base of the first transistor Q1 is connected to the first terminal of the second resistor R2 and the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the collector of the first transistor Q1 and then grounded. The second terminal of the second resistor R2 is connected to the P0.16 terminal of the Bluetooth chip MU1.

[0031] like Figure 2 and Figure 6 As shown, the button circuit includes a switch K1, a sixth capacitor C6, a sixth bidirectional diode D6, and a tenth resistor R10. The power output terminal VCC of the battery is connected in series with the tenth resistor R10 and then connected to the first terminal of the sixth capacitor C6, the first terminal of the sixth bidirectional diode D6, the first terminal of the switch K1, and the P0.23 terminal of the Bluetooth chip MU1. The second terminal of the sixth bidirectional diode D6 is connected to the second terminal of the sixth capacitor C6 and the second terminal of the switch K1 and then grounded.

[0032] like Figure 2 and Figure 7 As shown, the indicator circuit includes a first light-emitting diode (LED1), a second light-emitting diode (LED2), a third light-emitting diode (LED3), a first resistor (R1), an eighth resistor (R8), a ninth resistor (R9), a third bidirectional diode (D3), a fourth bidirectional diode (D4), and a fifth bidirectional diode (D5). The power output terminal VCC of the battery is connected to the positive terminals of the first LED1, the second LED2, and the third LED3, respectively. The negative terminal of the first LED1 is connected in series with the first resistor (R1) and then to the P0.29 terminal of the Bluetooth chip MU1 and the first terminal of the third bidirectional diode (D3), respectively. The negative terminal of the second LED2 is connected in series with the eighth resistor (R8) and then to the P0.28 terminal of the Bluetooth chip MU1 and the first terminal of the fourth bidirectional diode (D4), respectively. The negative terminal of the third LED3 is connected in series with the ninth resistor (R9) and then to the P0.30 terminal of the Bluetooth chip MU1 and the first terminal of the fifth bidirectional diode (D5), respectively. The second terminals of the third bidirectional diode (D3), the fourth bidirectional diode (D4), and the fifth bidirectional diode (D5) are all grounded.

[0033] like Figure 2 and Figure 8 As shown, the accelerometer circuit includes an accelerometer SU1, a second magnetic bead FB2, a first current resistor SR1, a second current resistor SR2, a third current resistor SR3, a fourth current resistor SR4, a fifth current resistor SR5, a sixth current resistor MR2, a seventh current resistor MR3, a second metal capacitor SC2, a third metal capacitor SC3, and a first metal capacitor SC1. The battery's power output terminal VCC is connected via the second magnetic bead FB2 to the VDD terminal of the accelerometer SU1, the VDD_IO terminal of the accelerometer SU1, the first terminal of the first current resistor SR1, the first terminal of the first metal capacitor SC1, the first terminal of the second metal capacitor SC2, the first terminal of the third metal capacitor SC3, the first terminal of the fourth current resistor SR4, the first terminal of the fifth current resistor SR5, the first terminal of the sixth current resistor MR2, and the first terminal of the seventh current resistor MR3. The second terminal of the first current resistor SR1 is connected to the ADC2 terminal of the accelerometer SU1, and the first terminal of the second current resistor SR2 is connected to the accelerometer SU1. The ADC1 terminal of the accelerometer SU1 is connected and the second terminal is grounded. The second terminals of the first metal capacitor SC1, the second metal capacitor SC2, and the third metal capacitor SC3 are all grounded. The first terminal of the third current resistor SR3 is connected to the ADC3 terminal of the accelerometer SU1. The second terminal of the third current resistor SR3 is connected to the GND terminal and the RES terminal of the accelerometer SU1 and then grounded. The second terminal of the fourth current resistor SR4 is connected to the CS terminal of the accelerometer SU1. The second terminal of the fifth current resistor SR5 is connected to the SDO / SA0 terminal of the accelerometer SU1. The second terminal of the sixth current resistor MR2 is connected to the SDA / SDI / SDO terminal of the accelerometer SU1. The second terminal of the seventh current resistor MR3 is connected to the SCL / SPC terminal of the accelerometer SU1. The INT1 terminal of the accelerometer SU1 is connected to the P0.07 terminal of the Bluetooth chip MU1. The INT2 terminal of the accelerometer SU1 is connected to the P0.08 terminal of the Bluetooth chip MU1.

[0034] This utility model relates to a lightweight indoor personnel tracking circuit based on low-power Bluetooth. The Bluetooth module serves as the core control and communication hub, while a battery provides the overall power source. Through the coordinated operation of the Bluetooth module, antenna circuit, infrared receiver circuit, accelerometer circuit, vibration motor circuit, button circuit, and indicator light circuit, a complete indoor personnel tracking process is achieved, encompassing power supply, signal acquisition, location determination, status alerts, and human-computer interaction. The specific working principle is as follows:

[0035] like Figure 1-8As shown, the battery's power output terminal VCC provides power to the entire circuit. On one hand, it directly powers the Bluetooth module: the battery's power output terminal VCC is connected to the VDD terminal of the Bluetooth chip MU1, the first terminal of the second metal capacitor MC2, the first terminal of the sixteenth metal capacitor MC16, and the first terminal of the sixth metal capacitor MC6. The second terminals of the second metal capacitor MC2, the sixteenth metal capacitor MC16, and the sixth metal capacitor MC6 are all grounded. Through the filtering effect of multiple sets of metal capacitors, a stable DC power supply is provided to the Bluetooth chip MU1, ensuring the stable operation of the Bluetooth module. On the other hand, the battery's power output... The VCC terminal supplies power to other functional circuits through different branches: when powering the infrared receiver circuit, the VCC terminal is directly connected to the VS terminal of the infrared receiver U1; when powering the vibration motor circuit, the VCC terminal is connected to the circuit in series with the first ferrite bead FB1; when powering the button circuit, the VCC terminal is connected to the circuit in series with the tenth resistor R10; when powering the indicator light circuit, the VCC terminal is directly connected to the positive terminal of each LED; when powering the accelerometer circuit, the VCC terminal is connected to the VDD terminal, VDD_IO terminal, and related components of the accelerometer SU1 via the second ferrite bead FB2. Current limiting and filtering ensure stable power supply to each functional circuit and prevent mutual interference. The Bluetooth module, as the core, undertakes two main functions: external communication and internal control. External communication is achieved through the antenna circuit, enabling wireless communication with the external Bluetooth gateway. The ANT terminal of the Bluetooth chip MU1 outputs a Bluetooth broadcast signal, which is first transmitted to the first terminal of the first multilayer inductor ML1. The first multilayer inductor ML1, together with the twelfth metal capacitor MC12, performs initial signal filtering and impedance matching. The second terminal of the twelfth metal capacitor MC12 is grounded to filter out noise. The signal then passes through the second terminal of the first multilayer inductor ML1 to the first terminal of the second multilayer inductor ML2, where it undergoes secondary filtering with the thirteenth metal capacitor MC13 and the fifteenth metal capacitor MC15. The second terminals of the thirteenth metal capacitor MC13 and the fifteenth metal capacitor MC15 are both grounded to further optimize signal quality. The final processed Bluetooth signal is transmitted through the second terminal of the second multilayer inductor ML2 to the antenna and broadcast to the Bluetooth gateway. Simultaneously, the antenna receives the feedback signal from the Bluetooth gateway and transmits it to the ANT terminal of the Bluetooth chip MU1 via a reverse circuit. The Bluetooth module analyzes the Bluetooth received signal strength (RSS) in the feedback signal. I) To make an initial assessment of the distance between the person and the Bluetooth gateway, providing basic data for range determination;For internal control, the Bluetooth module interacts with various functional circuits through different signal terminals: When interacting with the infrared receiver circuit, the VS terminal of the infrared receiver U1 is powered by the battery's power output terminal VCC. The fourteenth metal capacitor MC14 is connected between the GND terminal and the VS terminal of the infrared receiver U1 to filter and regulate voltage. After receiving the infrared signal from the Bluetooth gateway, the infrared receiver U1 converts it into an electrical signal and outputs it from the OUT terminal. This signal is then transmitted through the seventh resistor R7. The seventh bidirectional diode D7 is connected in parallel between the OUT terminal and ground to provide overvoltage protection. One end of the fifth resistor R5 is connected to the VS terminal of the infrared receiver U1, and the other end merges with the output terminal of the seventh resistor R7 to transmit the processed infrared electrical signal. The signal is transmitted to the P0.05 terminal of the Bluetooth chip MU1. One end of the fourth resistor R4 is connected to the VS terminal of the infrared receiver U1, and the other end is transmitted to the P0.04 terminal of the Bluetooth chip MU1 to monitor the power supply status. The Bluetooth module determines whether a person is within the infrared coverage area by parsing the signal at the P0.05 terminal, forming a dual range judgment basis of "Bluetooth + Infrared" with the RSSI data. When interacting with the accelerometer circuit, the battery power output terminal VCC is filtered by the second ferrite bead FB2 and then supplies power to the VDD terminal, VDD_IO terminal, and the first metal capacitor SC1, the second metal capacitor SC2, and the third metal capacitor SC3 of the accelerometer SU1. The second terminals of the three sets of metal capacitors are grounded for further filtering. The speed sensor SU1 acquires raw triaxial linear acceleration data via a three-axis signal stabilization method: ADC1 is connected to the second current resistor SR2 for grounding and current limiting; ADC2 is connected to the first current resistor SR1 for voltage division; and ADC3 is connected to the third current resistor SR3 for grounding. After processing, the data is converted into motion and attitude data. Chip select control is achieved via the CS terminal connected to the fourth current resistor SR4; data output is achieved via the SDO / SA0 terminal connected to the fifth current resistor SR5; and the INT1 and INT2 terminals are connected to the P0.07 and P0.08 terminals of the Bluetooth chip MU1 for rapid triggering and transmission to the Bluetooth module. The Bluetooth module parses the data to determine the person's activity status, avoiding misjudgments. When interacting with the vibration motor circuit, if the Bluetooth module determines that the person exceeds the specified limits... When the circuit is within range, a high-level signal is output from its P0.16 terminal to the second terminal of the second resistor R2. The first terminal of the second resistor R2 is connected to the base of the first transistor Q1. The third resistor R3 is connected in parallel between the base and the collector to provide bias protection. After the first transistor Q1 is turned on, the power output terminal VCC of the battery flows through the first magnetic bead FB1 for overcurrent protection, through the motor M3, the emitter of the first transistor Q1, and the collector to ground. The motor M3 vibrates to alert the user. The first capacitor C1 and the second capacitor C2 are connected in parallel across the motor M3 for filtering. The second diode D2 is connected in reverse parallel across the motor M3 to prevent damage to components from reverse electromotive force. After the personnel return to the range, the signal output from the P0.16 terminal stops, the first transistor Q1 is turned off, and the motor M3 stops.When interacting with the indicator light circuit, the Bluetooth module controls the indicator light through different signal terminals: Within the normal range, the first LED1 (green) outputs a low level at terminal P0.29, and current flows through the first LED and the first resistor R1 (current limiting) to terminal P0.29, illuminating the green light; when exceeding the limit, the second LED2 (red) outputs a low level at terminal P0.28, and current flows through the red light and the eighth resistor R8 to terminal P0.28, illuminating the red light; in case of a fault, the third LED3 (blue) outputs a low level at terminal P0.30, and current flows through the blue light and the ninth resistor R9 to terminal P0.30, illuminating the blue light. The third LED is bidirectional. Diodes D3, D4, and D5 are connected in parallel to provide overvoltage protection between each diode and ground. When interacting with the button circuit, pressing switch K1 triggers the circuit formed by the battery VCC and the tenth resistor R10. The sixth capacitor C6 filters the signal, and the sixth bidirectional diode D6 provides overvoltage protection. The switch signal is transmitted to the P0.23 pin of the Bluetooth chip MU1, enabling operations such as resetting the range and providing confirmation. Throughout this process, the Bluetooth module integrates data from various circuits and operational commands, continuously completing the cycle of "data acquisition, range determination, status feedback, and interactive response," achieving a complete lightweight indoor personnel tracking function.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A lightweight indoor people tracking circuit based on Bluetooth Low Energy, characterized in that, The device includes a Bluetooth module, a battery, an antenna circuit, an infrared receiver circuit, a vibration motor circuit, a button circuit, an indicator light circuit, and an accelerometer sensor circuit. The battery powers the Bluetooth module. The Bluetooth module is communicatively connected to both the infrared receiver circuit and the accelerometer sensor circuit. The signal output terminal of the Bluetooth module is connected to the signal input terminal of both the vibration motor circuit and the indicator light circuit. The signal output terminal of the button circuit is connected to the signal input terminal of the Bluetooth module. The Bluetooth module communicates with a Bluetooth gateway via the antenna circuit.

2. The lightweight indoor people tracking circuit based on Bluetooth Low Energy as described in claim 1, characterized in that, The Bluetooth module includes a Bluetooth chip, a second metal capacitor, a sixteenth metal capacitor, and a sixth metal capacitor. The power output terminal of the battery is connected to the VDD terminal of the Bluetooth chip, the first terminal of the second metal capacitor, the first terminal of the sixteenth metal capacitor, and the first terminal of the sixth metal capacitor, respectively. The second terminals of the second metal capacitor, the sixteenth metal capacitor, and the sixth metal capacitor are all grounded.

3. The lightweight indoor people tracking circuit based on Bluetooth Low Energy as described in claim 2, characterized in that, The antenna circuit includes a first multilayer inductor, a second multilayer inductor, a twelfth metal capacitor, a thirteenth metal capacitor, a fifteenth metal capacitor, an eighteenth metal capacitor, and an antenna. The first end of the first multilayer inductor is connected to the first end of the twelfth metal capacitor and the ANT terminal of the Bluetooth chip. The second end of the first multilayer inductor is connected to the first end of the second multilayer inductor, the first end of the thirteenth metal capacitor, and the first end of the fifteenth metal capacitor. The second end of the second multilayer inductor is connected to the first end of the eighteenth metal capacitor and the antenna and then grounded. The second end of the thirteenth metal capacitor is connected to the second ends of the fifteenth and eighteenth metal capacitors and then grounded. The second end of the twelfth metal capacitor is grounded.

4. The lightweight indoor people tracking circuit based on Bluetooth Low Energy as described in claim 2, characterized in that, The infrared receiver circuit includes an infrared receiver, a fourth resistor, a fifth resistor, a seventh resistor, a fourteenth metal capacitor, a seventh bidirectional diode, and an eighth bidirectional diode. The GND terminal of the infrared receiver is connected to the first terminal of the fourteenth metal capacitor, the first terminal of the seventh bidirectional diode, and the first terminal of the eighth bidirectional diode, respectively, and then grounded. The VS terminal of the infrared receiver is connected to the second terminal of the fourteenth metal capacitor, the first terminal of the fourth resistor, the first terminal of the fifth resistor, the first terminal of the eighth bidirectional diode, and the power output terminal of the battery, respectively. The second terminal of the fourth resistor is connected to the P0.04 terminal of the Bluetooth chip. The OUT terminal of the infrared receiver is connected to the second terminal of the seventh bidirectional diode and the first terminal of the seventh resistor, respectively. The second terminal of the seventh resistor is connected to the second terminal of the fifth resistor and the P0.05 terminal of the Bluetooth chip, respectively.

5. The lightweight indoor people tracking circuit based on Bluetooth Low Energy as described in claim 2, characterized in that, The vibration motor circuit includes a first ferrite bead, a first capacitor, a second capacitor, a second diode, a motor, a first transistor, a second resistor, and a third resistor. The power output terminal VCC of the battery is connected in series with the first ferrite bead and then connected to the first terminal of the first capacitor, the first terminal of the second capacitor, the first terminal of the second diode, and the first terminal of the motor. The second terminal of the first capacitor is grounded. The second terminal of the second capacitor is connected to the second terminal of the second diode, the second terminal of the motor, and the emitter of the first transistor. The base of the first transistor is connected to the first terminal of the second resistor and the first terminal of the third resistor. The second terminal of the third resistor is connected to the collector of the first transistor and then grounded. The second terminal of the second resistor is connected to the P0.16 terminal of the Bluetooth chip.

6. The lightweight indoor people tracking circuit based on Bluetooth Low Energy according to claim 2, characterized in that, The button circuit includes a switch, a sixth capacitor, a sixth bidirectional diode, and a tenth resistor. The power output terminal VCC of the battery is connected in series with the tenth resistor and then connected to the first terminal of the sixth capacitor, the first terminal of the sixth bidirectional diode, the first terminal of the switch, and the P0.23 terminal of the Bluetooth chip. The second terminal of the sixth bidirectional diode is connected to the second terminal of the sixth capacitor and the second terminal of the switch and then grounded.

7. The lightweight indoor people tracking circuit based on Bluetooth Low Energy according to claim 3, characterized in that, The indicator light circuit includes a first light-emitting diode, a second light-emitting diode, a third light-emitting diode, a first resistor, a ninth resistor, a third bidirectional diode, a fourth bidirectional diode, and a fifth bidirectional diode. The power output terminal of the battery is connected to the positive terminals of the first, second, and third light-emitting diodes, respectively. The negative terminal of the first light-emitting diode is connected in series with the first resistor and then connected to the P0.29 terminal of the Bluetooth chip and the first terminal of the third bidirectional diode, respectively. The negative terminal of the second light-emitting diode is connected in series with the eighth resistor and then connected to the P0.28 terminal of the Bluetooth chip and the first terminal of the fourth bidirectional diode, respectively. The negative terminal of the third light-emitting diode is connected in series with the ninth resistor and then connected to the P0.30 terminal of the Bluetooth chip and the first terminal of the fifth bidirectional diode, respectively. The second terminals of the third, fourth, and fifth bidirectional diodes are all grounded.

8. The lightweight indoor people tracking circuit based on Bluetooth Low Energy according to claim 3, characterized in that, The accelerometer circuit includes an accelerometer, a second ferrite bead, a first current resistor, a second current resistor, a third current resistor, a fourth current resistor, a fifth current resistor, a sixth current resistor, a seventh current resistor, a second metal capacitor, a third metal capacitor, and a first metal capacitor. The power output terminal of the battery is connected via the second ferrite bead to the VDD terminal and VDD_IO terminal of the accelerometer, the first terminal of the first current resistor, the first terminal of the first metal capacitor, the first terminal of the second metal capacitor, the first terminal of the third metal capacitor, the first terminal of the fourth current resistor, the first terminal of the fifth current resistor, the first terminal of the sixth current resistor, and the first terminal of the seventh current resistor. The second terminal of the first current resistor is connected to the ADC2 terminal of the accelerometer, and the first terminal of the second current resistor is connected to the ADC1 terminal of the accelerometer and grounded. The second terminals of the first, second, and third metal capacitors are all grounded. The first terminal of the third current resistor is connected to the ADC3 terminal of the accelerometer. The second terminal of the third current resistor is connected to the GND terminal and the RES terminal of the accelerometer and then grounded. The second terminal of the fourth current resistor is connected to the CS terminal of the accelerometer. The second terminal of the fifth current resistor is connected to the SDO / SA0 terminal of the accelerometer. The second terminal of the sixth current resistor is connected to the SDA / SDI / SDO terminal of the accelerometer. The second terminal of the seventh current resistor is connected to the SCL / SPC terminal of the accelerometer. The INT1 terminal of the accelerometer is connected to the P0.07 terminal of the Bluetooth chip. The INT2 terminal of the accelerometer is connected to the P0.08 terminal of the Bluetooth chip.

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