CN209803748U

CN209803748U - Non-contact capacitance type virtual mouse control system

Info

Publication number: CN209803748U
Application number: CN201920712746.3U
Authority: CN
Inventors: 叶勇; 裴向东; 郭卫卫; 苏安鑫; 韩春峰; 王昪辉
Original assignee: LYULIANG MILITARY AND CIVILIAN INTEGRATION COLLABORATIVE INNOVATION RESEARCH INSTITUTE
Current assignee: LYULIANG MILITARY AND CIVILIAN INTEGRATION COLLABORATIVE INNOVATION RESEARCH INSTITUTE
Priority date: 2019-05-18
Filing date: 2019-05-18
Publication date: 2019-12-17
Anticipated expiration: 2029-05-18

Abstract

The utility model relates to a non-contact capacitance type virtual mouse control system, which belongs to the technical field of mouse control and specifically comprises that the input end of a short-range capacitance sensor array is connected with a drive circuit, the output end of the short-range capacitance sensor array is connected with a control circuit, and the output end of the control circuit is connected with a computer; the control circuit comprises an analog switch, a C/V conversion circuit, an LPF circuit, an ADC circuit, a USB HID interface circuit and an FPGA central controller, wherein the analog switch is connected with the output end of the short-range capacitance sensor array, the analog switch is connected with the ADC circuit through the C/V conversion circuit and the LPF circuit in sequence, the USB HID interface circuit is connected with a computer, and the analog switch, the ADC circuit and the USB HID interface circuit are also connected with the FPGA central controller respectively; the utility model discloses simple structure, convenient operation can utilize short range capacitive sensor array response gesture control mouse.

Description

Non-contact capacitance type virtual mouse control system

Technical Field

The utility model relates to a virtual mouse control system of non-contact capacitance formula belongs to mouse control technical field.

Background

In conventional processor-based systems (e.g., laptop computers, desktop computers, cellular telephones, media playing devices such as gaming devices, and other such devices), touch screen input mouse commands provide an alternative to the use of keyboard or mouse input cursor commands. For example, mouse commands may be used to move a cursor to make a selection on a display screen. Conventionally, a user holds a mouse in his hand and movement of the mouse moves a cursor. Clicking on a button on the mouse enables selection of the displayed object overlaid by the cursor. In some cases, however, mobile users may find it inconvenient to use a mouse because of the need to carry an additional device that may be larger than the actual processor-based device (e.g., a cellular telephone). Also, with small screen devices (such as those found on cellular phones), there may not be enough screen space to select some of the smaller features displayed on the screen. Another problem is that it may be difficult for a user to accurately place the mouse cursor at a particular location in the case of small icon buttons or links on the display screen.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that prior art exists, the utility model provides a simple structure, convenient operation utilizes the virtual mouse control system of non-contact capacitance formula of short-range capacitive sensor array response gesture control mouse.

In order to achieve the above object, the technical solution of the present invention is a non-contact capacitive virtual mouse control system, including two sets of short-range capacitive sensor arrays, a driving circuit, a control circuit and a computer, wherein the input end of the short-range capacitive sensor array is connected to the driving circuit, the output end of the short-range capacitive sensor array is connected to the control circuit, and the output end of the control circuit is connected to the computer; the control circuit comprises an analog switch, a C/V conversion circuit, an LPF circuit, an ADC circuit, a USB HID interface circuit and an FPGA central controller, wherein the analog switch is connected with the output end of the short-range capacitance sensor array, the analog switch is connected with the ADC circuit through the C/V conversion circuit and the LPF circuit in sequence, the USB HID interface circuit is connected with a computer, and the analog switch, the ADC circuit and the USB HID interface circuit are also connected with the FPGA central controller respectively; the short-range capacitive sensor array is used for detecting the motion track of the hand; the analog switch is used for switching different sensitive electrodes to work in a time-sharing multiplexing mode; the C/V conversion circuit is used for converting alternating current excitation current received by the sensitive end of the sensor into an alternating voltage signal; the LPF circuit is used for rectifying the alternating voltage signal into a direct current signal; the ADC circuit is used for blocking direct current signals; the USB HID interface circuit is used for realizing the analysis of a USB HID command and operating correspondingly with a mouse of a computer; the FPGA central controller is used for being responsible for communication between the working time sequence of each circuit and the USB interface, processing the sensor array signals, and analyzing the hand movement direction and mouse clicking, right clicking and double clicking gestures which are obtained by a linear weighting method.

Preferably, the driving circuit comprises an active oscillator and a low-pass filter circuit, wherein the active oscillator is used for providing 1MHz alternating current signals, and after filtering processing of the low-pass filter circuit, sinusoidal voltages of 1MHz and 1V are obtained.

Preferably, the analog switch adopts an ADG1212 which supplies power with +/-15V and two channels.

Preferably, the USB HID interface circuit adopts a PDIUSBDL2 interface chip.

Preferably, the short-range capacitive sensor array is made of a conductive material copper sheet or PCB, each group of short-range capacitive sensor array mainly comprises five electrodes, wherein four electrodes are uniformly distributed around a central electrode, the central electrode is an emitting electrode, and the rest electrodes are sensitive electrodes.

Compared with the prior art, the utility model discloses following technological effect has: the utility model has simple structure and convenient operation, utilizes the analog switch to switch the sensitive electrodes of the short-range capacitance sensor array, and solves the sensitive information of each electrode to obtain the motion information of the hand; through resolving specific hand information, click, right click, double click and all-direction movement of the mouse are obtained, then the controller writes a USB HID protocol command corresponding to the resolving signal into the USB interface circuit to achieve the mouse operation function, the sensitivity is high, and the interestingness of man-machine interaction is greatly increased.

Drawings

Fig. 1 is a control schematic block diagram of the present invention.

Fig. 2 is a circuit diagram of the C/V circuit and the LPF circuit of the present invention.

Fig. 3 is a circuit diagram of the USB HID interface circuit of the present invention.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to fig. 3, a non-contact capacitive virtual mouse control system includes two sets of short-range capacitive sensor arrays 1, a driving circuit 2, a control circuit 3 and a computer 4, wherein an input end of the short-range capacitive sensor array 1 is connected with the driving circuit 2, an output end of the short-range capacitive sensor array 1 is connected with the control circuit 3, and an output end of the control circuit 3 is connected with the computer 4; the control circuit 3 comprises an analog switch 5, a C/V conversion circuit 6, an LPF circuit 7, an ADC circuit 8, a USB HID interface circuit 9 and an FPGA central controller 10, the analog switch 5 is connected with the output end of the short-range capacitance sensor array 1, the analog switch 5 is connected with the ADC circuit 8 sequentially through the C/V conversion circuit 6 and the LPF circuit 7, the USB HID interface circuit 9 is connected with the computer 4, the analog switch 5, the ADC circuit 8 and the USB HID interface circuit 9 are also connected with the FPGA central controller 10 respectively, and the short-range capacitance sensor array 1 is used for detecting the motion track of a hand; the analog switch 5 is used for switching different sensitive electrodes to perform time division multiplexing work; the C/V conversion circuit 6 is used for converting the alternating current excitation current received by the sensitive end of the sensor into an alternating voltage signal; the LPF circuit 7 is configured to rectify the ac voltage signal into a dc signal; the ADC circuit 8 is used for blocking direct current signals; the USB HID interface circuit 9 is used for realizing the analysis of the USB HID command and corresponding operation with a mouse of a computer; the FPGA central controller 10 is responsible for communication between the working timing sequence of each circuit and the USB interface, and processes the sensor array signals, including the hand movement direction obtained by the linear weighting method and the analysis of the mouse click, right click, and double click gestures.

The short-range capacitive sensor array 1 is made of a conductive material copper sheet or PCB, each group of short-range capacitive sensor array mainly comprises five electrodes, wherein four electrodes are uniformly distributed around a central electrode, the central electrode is an emitting electrode, and the rest electrodes are sensitive electrodes. The sensitive electrodes do not work simultaneously, and are switched by an analog switch in the control circuit, so that the power consumption is reduced, and the circuit cost is reduced. When the hand moves, the sensitivity of each position sensor is caused, but the sensitivity is different due to the different distances between the hand and each sensor, and the more accurate spatial position of the hand is obtained by the linear weighting method through the sensitivity of each sensor and the central position of the electrode. And resolving the spatial positions of the hands at different times or the motion information of the hands so as to resolve the operation intention of the mouse.

The driving circuit 2 comprises an active oscillator and a low-pass filter circuit, wherein the active oscillator is used for providing 1MHz alternating current signals, and 1MHz and 1V sinusoidal voltage is obtained after filtering processing of the low-pass filter circuit, so that field energy of a sensitive space is improved. The analog switch 5 adopts an ADG1212 which supplies +/-15V, has two channels, has smaller on-state capacitance which is 1pF, and has smaller influence on a subsequent capacitive sensor. Different driving and sensitive electrodes can be subjected to time-sharing multiplexing work by controlling channel switching.

The USB HID interface circuit 9 adopts a PDIUSBDL2 interface chip. As shown in fig. 3. The communication between the equipment and the PC is realized by controlling PDIUSBDL2 through the FPGA, wherein when the address bit A0 is 1, the command is sent, and when A0 is 0, the data is sent or received; the read/write signals RD-N and WR-N and the interrupt signal lNT-N are both active low; data bus D [ 7: o ] is bidirectional. The GLN is a working indicator light of the chip. XI-ALl and XTAL2 are connected with a 6MHz crystal oscillator. D + and D are USB differential data lines connected to the USB plug. For the power supply portion, since PDIUSBDL2 is connected to the FPGA, the power supply on the board can get 3.3V from the FPGA circuit board.

The foregoing is considered as illustrative and not restrictive of the preferred embodiments of the invention, and any modifications, equivalents and improvements made within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. A non-contact capacitance type virtual mouse control system is characterized in that: the system comprises two groups of short-range capacitive sensor arrays, a driving circuit, a control circuit and a computer, wherein the input ends of the short-range capacitive sensor arrays are connected with the driving circuit, the output ends of the short-range capacitive sensor arrays are connected with the control circuit, and the output ends of the control circuit are connected with the computer; the control circuit comprises an analog switch, a C/V conversion circuit, an LPF circuit, an ADC circuit, a USB HID interface circuit and an FPGA central controller, wherein the analog switch is connected with the output end of the short-range capacitance sensor array, the analog switch is connected with the ADC circuit through the C/V conversion circuit and the LPF circuit in sequence, the USB HID interface circuit is connected with a computer, the analog switch, the ADC circuit and the USB HID interface circuit are also connected with the FPGA central controller respectively, and the short-range capacitance sensor array is used for detecting the motion track of a hand; the analog switch is used for switching different sensitive electrodes to work in a time-sharing multiplexing mode; the C/V conversion circuit is used for converting alternating current excitation current received by the sensitive end of the sensor into an alternating voltage signal; the LPF circuit is used for rectifying the alternating voltage signal into a direct current signal; the ADC circuit is used for blocking direct current signals; the USB HID interface circuit is used for realizing the analysis of a USB HID command and operating correspondingly with a mouse of a computer; the FPGA central controller is used for being responsible for communication between the working time sequence of each circuit and the USB interface, processing the sensor array signals, and analyzing the hand movement direction and mouse clicking, right clicking and double clicking gestures which are obtained by a linear weighting method.

2. The virtual mouse control system of claim 1, wherein: the driving circuit comprises an active oscillator and a low-pass filter circuit, wherein the active oscillator is used for providing 1MHz alternating current signals, and sinusoidal voltages of 1MHz and 1V are obtained after filtering processing of the low-pass filter circuit.

3. The virtual mouse control system of claim 1, wherein: the analog switch adopts an ADG1212, and the power supply of the ADG1212 is +/-15V and two channels.

4. The virtual mouse control system of claim 1, wherein: the USB HID interface circuit adopts a PDIUSBDL2 interface chip.

5. The virtual mouse control system of claim 1, wherein: the short-range capacitive sensor array is made of conductive materials such as copper sheets or PCBs, each group of short-range capacitive sensor array mainly comprises five electrodes, wherein four electrodes are uniformly distributed around a central electrode, the central electrode is an emitting electrode, and the rest electrodes are sensitive electrodes.