CN216901573U

CN216901573U - Gesture data transmission discernment control circuit based on TOF

Info

Publication number: CN216901573U
Application number: CN202123204512.4U
Authority: CN
Inventors: 怯肇乾; 官莉萍; 史继峰
Original assignee: Nanchang Vocational University
Current assignee: Nanchang Vocational University
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2022-07-05
Anticipated expiration: 2031-12-21

Abstract

The utility model provides a gesture data transmission and identification control circuit based on a laser femtosecond ranging TOF (time of flight) aiming at the defects and shortcomings in the existing gesture data transmission and identification technology, and the characteristics of low power consumption, interference resistance, high real-time performance and wearability can be effectively realized. The wearable micro-device mainly comprises a main board and a bottom board, wherein the main board is connected with the bottom board through a socket (with a power signal), and the wearable micro-device is small in design and forms a micro wearable device. A button and a photosensitive sensor are placed in the middle of the front surface of the mainboard, three TOF sensors are horizontally placed at the periphery of the mainboard and are in a triangular shape, a rechargeable battery is carried on the back surface of the bottom plate, a LoRa wireless communication micro-module and a power supply circuit are arranged on the front surface of the bottom plate, and a detection operation control circuit taking a micro-controller as a core is arranged on the back surface of the mainboard; the on-off of the switch circuit is controlled through the button and the control signal, so that the low-power consumption target of the gesture recognition wearable device is achieved; the self-adaptation to the ambient light is realized through a photosensitive sensor; the LoRa micromodules are used for conducting gesture data wireless transmission, and the wireless transmission distance and the anti-interference capacity are enhanced.

Description

Gesture data transmission discernment control circuit based on TOF

Technical Field

The utility model relates to the technical field of wireless data communication, in particular to a gesture data transmission identification control circuit based on laser femtosecond ranging TOF (time of flight).

Background

With the widespread application of mobile devices in life, gesture data is a novel man-machine interaction communication mode following the traditional input device. An efficient gesture data identification and transmission mode has important research significance.

At present, a gesture data transmission and recognition method mainly obtains a gesture receipt based on an infrared thermoelectric sensor, a magnetic sensor and a camera. The infrared thermoelectric sensor recognizes gesture data by sensing space temperature change, but the influence of the environment temperature on the infrared thermoelectric sensor is large, and the accuracy is low when the temperature change is small; the magnetic sensor senses the movement of a finger, so that the magnetic field changes, and gesture data identification is further performed, but the magnetic sensor is inconvenient to wear on a hand and is not beneficial to popularization; the method has the advantages that the camera is directly used for gesture recognition, the hardware and software system is huge in structure and low in price, and the method is difficult to be applied to ordinary scenes such as extensive classroom teaching and the like.

Therefore, how to provide a gesture data transmission and recognition control circuit that is convenient to wear, low in power consumption, little affected by the environment, and high in integration level is a problem that needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects and shortcomings in the existing gesture data transmission and recognition technology, the utility model provides the gesture data transmission and recognition control circuit based on the TOF, which can effectively realize the characteristics of low power consumption, interference resistance, high real-time performance and wearability.

In order to achieve the purpose, the utility model adopts the following technical scheme:

1. the wearable micro-device mainly comprises a main board and a bottom board, wherein the main board and the bottom board are connected through a power strip (with a power signal), and the wearable micro-device is small in design and forms a micro wearable device. Put button and photosensitive sensor in the middle of mainboard openly, its periphery is kept flat three TOF sensor and is the triangle-shaped form, but the bottom plate back carries rechargeable battery, and the front of bottom plate is loRa wireless communication micromodule and power supply circuit, and the mainboard reverse side uses microcontroller as the detection operation control circuit of core.

2. The utility model can control the bottom plate switch circuit through the button designed on the mainboard, realize the system supplies power continuously and cuts off the system power supply; the detection operation control circuit with the microcontroller as a core can continuously detect the working state of the system, and when the system does not work within 10 minutes, the microcontroller sends a control signal to cut off the power supply of the system, so that the low-power consumption target of the whole gesture recognition wearable device is achieved.

3. The photosensitive sensor arranged on the front surface of the mainboard can sense the change of ambient light, and the detected ambient light signal is used as an input signal for realizing the self-adaption of the ambient light and improving the anti-interference capability of the mainboard.

4. According to the utility model, the LoRa micro-module is adopted to perform gesture data wireless transmission, so that the data transmission distance and the anti-interference capability of transmission signals are improved.

Compared with the prior art, the utility model has the beneficial technical effects that:

1. the integrated circuit has high integration level and small design, fully utilizes the peripherals and interfaces integrated in the microcontroller, minimizes the peripheral components, and achieves complete portable wearing because the whole system mainly comprises a mainboard and a bottom plate;

2. the utility model adopts three TOF sensor pieces to carry out cooperative distance measurement, thereby realizing simple gesture action identification such as up, down, left, right, clicking and the like, and having short distance measurement time and high identification precision;

3. the utility model adopts low power consumption design, adds a detection circuit when designing a power supply circuit, and automatically stops power supply when the circuit does not work within 10 minutes, thereby playing a role in saving power.

4. The utility model adopts the LoRa (Long Range radio) micromodule to carry out gesture data wireless transmission, has longer transmission distance and stronger anti-interference performance than other wireless modes under the same power consumption condition, and realizes the unification of low power consumption, long distance and high reliability of gesture data transmission.

5. A photosensitive sensor is adopted to detect typical environmental changes such as sunlight, incandescent lamps, fluorescent lamps, night lights and the like, and the typical environmental changes are converted into electric signals through an analog-to-Digital converter (ADC) for transmission, so that the self-adaption of the environmental light is realized.

Drawings

FIG. 1 is a schematic diagram of the general architecture of the present invention;

FIG. 2 is a circuit diagram of the motherboard of the present invention;

fig. 3 is a circuit diagram of the backplane of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative and explanatory of the utility model and do not restrict the utility model.

Description of the entirety

As shown in fig. 1, the utility model provides a gesture data transmission and recognition control circuit based on TOF, which includes a motherboard and a backplane, wherein the backplane is used for providing power supply and wireless communication for the motherboard. The main board comprises a microcontroller MCU (microcontroller Unit), TOF sensors (M1an, M1bn and M1), an environment photosensitive sensor and a button K1A; the bottom plate comprises a USB interface P3, a charging and power supply chip, a rechargeable battery access P4, a switch circuit, a power supply conversion PD and a Lora module M2. TOF sensors (M1an, M1bn and M1) in the mainboard are connected with an on-chip interface IIC (Inter-Integrated Circuit) of the MCU; the USB interface P3 and the rechargeable battery access P4 in the bottom plate are respectively connected with the charging and power supply chip, and the charging and power supply chip, the switch circuit, the power conversion PD and the Lora module are sequentially connected; p3 and P4 are used for supplying power respectively; the charging and power supplying chip is used for supplying power to the charging and control circuit of the rechargeable battery through P4; the power conversion PD is connected with the mainboard and used for supplying power to the mainboard; the Lora module is connected with the MCU of the mainboard and used for wireless transceiving communication. The mainboard and the bottom plate are connected into a whole through the extension socket arranged on two sides, and the extension socket transmits power and signals simultaneously.

Through the design, the gesture data transmission recognition control provided by the utility model achieves the advantages of simple circuit, few internal devices and simple circuit welding, wherein the TOF sensors M1an, M1bn and M1 are horizontally arranged in a triangular shape to carry out cooperative ranging and operational analysis, so that the gesture action recognition of up, down, left, right, clicking and the like is realized, the external environment and the interference of human factors are avoided, and the accurate data can be conveniently and quickly acquired. According to the utility model, the LoRa micro-module is adopted for transmitting the gesture data, the transmission distance is longer than that of other wireless modes under the same power consumption condition, and the unification of low power consumption, long distance and high reliability of the gesture data transmission is realized. The utility model also designs a micro button circuit, when the circuit does not work within the specified time, the software design can automatically stop power supply, thereby playing the role of saving power.

Description of the mainboard

Referring to fig. 2, the main board circuit includes a microcontroller MCU (split into four parts of U1A, U1B, U1C and U1D for convenience and clarity of circuit display), TOF sensors (M1an, M1bn and M bn), field effect transistors (Mn bn and Mn bn), power conversion PDn bn, micro button K1 bn, resistors (R bn, Rn bn, capacitors (C bn, Cn bn, C6859, C bn, Pn bn, C bn, Pn bn, C bn, and P bn, and a photosensitive crystal bn.

The button K1A is arranged in the middle of the front surface of the main board, and three horizontal TOF sensors are arranged around the main board; and all electronic components such as MCU and the like are placed on the reverse side of the mainboard.

IIC connections (SCK and SDA) between a microcontroller MCU (U1C) and three TOF sensors (M1, M1a and M1b) respectively adopt a field effect tube Mn1 and a field effect tube Mn2, so that blockage and signal interference can be avoided, and smooth transition of 2.8V signals and 3.3V signals is achieved. The microcontroller obtains raw data through IIC communication and three TOF ranging sensors. The 3.3V power supply is pulled up to form a driving enhancement resistor, the M1C side is provided with Rn6 and Rn5, and the sensor (M1, M1an and M1bn) side is provided with Rn3 and Rn 4. The 2.8V power used by the sensor is converted from 3.3V power by PDn1, Cn1, Cn2 complete the 3.3V power/ground filtering of the front end of PDn1, Cn3, Cn4 complete the 2.8V power/ground filtering of the back end of PDn 1. Other control/state signals (interrupt INT and control xsut) connected between the MCU (U1C) and the respective TOF sensors (M1, M1a, M1b) are pulled up to the 2.8V supply via resistors R5, R6, R7, Rn8, Rn7, Rn9, respectively, to enhance the driving capability.

And the R3 and the C1 are connected between a 3.3V power supply and the ground, are connected with the NRST end of the U1A in the middle, and form a reset circuit of the microcontroller MCU. The Boot0 end of U1A is connected with a 3.3V power supply and the ground through Rn1 and Rn2 respectively, and the starting mode selection of the MCU is completed. The PA13/JTMS-SWD and PA14/JTCK-SWclk of the U1A are pulled up to a 3.3V power supply by the R1 and the R2, and the PA13/JTMS-SWD and PA14/JTCK-SWclk of the U1A realize the simulation debugging of the MCU through the P1. The P2 is connected with the PA10/Uart1Rx and the PA9/Uart1Tx of the U1A, and the debugging information output of the MCU and the program downloading during production are realized. VDD and VDDA of the U1A are connected with a 3.3V power supply, gns and VSS of the U1 are grounded, and C5, C6 and E1 are connected between the 3.3V power supply and the ground, so that decoupling filtering of the MCU is realized. R4, C2 and C4 form a crystal oscillation circuit and are connected with PD0/OSCin and PD1/OSCout of M1U.

U1D is connected Pn2, accomplishes and gets electricity (3.3V power and ground) through the bottom plate to with bottom plate USB differential signal D +, D1 access MCU's PA12/USBpm and A11/USBdm, still can realize low-power consumption through MCU's PA15 control bottom plate outage. The

ends

6 and 7 of the Pn2 are connected with the K1A, and the K1A is pressed down, so that the system quits low power consumption and continuously supplies power. The power supply and interruption will be described in detail later.

Pn1 is connected to U1B, to realize the access of the LoRa micromodule signal of the backplane to the MCU, and the communication mode may be Asynchronous serial communication USART (Universal Synchronous/Asynchronous Receiver/Transmitter) or serial Peripheral communication spi (serial Peripheral interface).

One end of the photosensitive sensor is connected with a 3.3V voltage source, and the other end of the photosensitive sensor is connected with the on-chip and external ADC of U1C.

Description of the soleplate

Referring to fig. 3, the backplane circuit includes a LoRa micro module M2, a charging and power-supplying control chip ChgRsDc, an inductor L1, a resistor (R9, R10, R11, R12, R13, R14, Rn1, Rn2, Rn3), a capacitor (C10, C11, C12), a polar capacitor (E3, E4, E5, E6, E7, E8, E9), a field effect transistor M3, a diode (D1, D2, D3), a triode Q1, an over-current and over-voltage protection TVS1, a precision voltage source PR1, a dc conversion PD, a battery access P4, a plug interface (P2n, Pn3), and a USB interface P3.

The battery is placed to the bottom plate, the back, and the front is placed loRa micromodule and other electronic components.

E3, C10 and E9 are connected between a 3.3V power supply and the ground at all places. E8 and C12 are connected with a 5V power supply and the ground. E7 is connected with PR1, R13, Q1 and D2. One end of M3 is connected with 5V power supply, and the other end is respectively connected with PR1 and R12.

And the Vcc end of the USB interface P3 is connected with the In port of the charging and power supplying chip ChgRSDc, and the D-and D + of the USB interface P3 form differential signals and are respectively connected with the on-chip USB (U1D) of the main board MCU through 2 current limiting resistors Rn3 and Rn2 and further through the Pn3 (main board Pn 2).

The TVS1 is connected between Vcc and ground of the USB interface P3 for overcurrent and overvoltage protection.

M0, M1, M2, RxD, TxD and AUX ends of the Lora micro module M2 are accessed to P2n, namely Pn1 of the mainboard, and further accessed to U1B of the mainboard MCU.

The charging and power supply control chip is a ChgRSDc chip, the SW end of the chip is connected with an inductor L1, the Enb1 end and the Battery end of the chip are connected with P4, the State/Led end of the chip is connected with the Vcc pin of P3, the iSet end of the chip is connected with R10, and the EP end of the chip is grounded.

Description of power supply and power failure

The charging and power supply control chip ChgRSDc can be connected through a P3 interface of the bottom plate, and then the battery is charged through P4. The system 5V power supply can be discharged through a battery of P4, or can be directly supplied by a USB interface P3 during charging. When the power is supplied by a P4 battery, the ChgRSDc boosts the low battery voltage to a 5V power supply through an internally integrated boost voltage stabilizing module to supply power to the whole circuit.

In order to realize low power consumption of the wearable device, when the sensor circuit does not work within 10 minutes, a high level is sent to the bottom board through a PA15 port of a main board U1D and a main board Pn2 and a bottom board Pn3 which are connected, a triode Q1 connected with a Pn3 on the bottom board is conducted, so that the PR1 connected with the bottom board is powered off, an M3 connected with the PR1 is disconnected, 5V power is not supplied to the PD, and a 3.3V power supply disappears. By pressing the micro button K1A on the mainboard, the 5V power supply is obtained through the 6 ports of 5V by the 7 ports of the mainboard Pn3 and the bottom plate Pn3 which are connected, and the PR1 recovers the function of the voltage source by the D3 and the R13 of the bottom plate, so that the M3 of the bottom plate is conducted, the PD of the bottom plate obtains 5V power supply, and the power supply outputs 3.3V power supply to recover and supply power for the whole circuit. When power supply is started, the 3.3V power supply is connected with the PR1 of the bottom plate through the R14 and the D2 of the bottom plate, and power supply maintenance is achieved.

Claims

1. A gesture data transmission recognition control circuit based on TOF is characterized in that components are selected based on a compact and tiny principle, and a power supply signal socket is used for connecting a main board and a bottom board to form a miniature wearable device;

the main board comprises a microcontroller MCU, TOF sensors (M1an, M1bn and M1), an environment photosensitive sensor and a button K1A, wherein the button and the photosensitive sensor are placed in the middle of the front surface of the main board, three TOF sensors arranged in a triangular shape are flatly placed around the main board, and a detection operation control circuit taking the microcontroller MCU as a core is placed on the back surface of the main board;

the bottom plate comprises a USB interface P3, a charging and power supplying chip, a rechargeable battery access P4, a switch circuit, a power conversion PD and a Lora module M2, wherein the rechargeable battery is arranged on the back surface of the bottom plate, and the LoRa micro module and the power supply, conversion and switch circuit thereof are arranged on the front surface of the bottom plate.