TWI397841B - Coordinate positioning device - Google Patents

Description

Coordinate positioning device

The invention belongs to the field of computer peripheral input devices, and relates to a coordinate positioning device, in particular to a coordinate positioning device capable of performing wireless and wired dual mode conversion input.

The coordinate positioning device is a computer input device that can be used for circuit design, CAD design, graphic design, free painting, and input of text and data. The coordinate positioning device generally includes a tablet and an electronic whiteboard. When inputting information, use the stylus to write text or draw graphics in the sensing area of the tablet, and record the corresponding trajectory to input to the computer for identification. When the electronic whiteboard is used with the computer, the input device can be operated on the electronic whiteboard to run any application on the computer, and the editing, commenting, and saving of the file can be realized on the computer by using the keyboard and the mouse. Operation. The coordinate positioning device can be divided into a wired coordinate positioning device and a wireless coordinate positioning device in terms of working mode.

The wired coordinate positioning device is suitable for close-point point-to-point handwriting input. A disadvantage of such a coordinate positioning device is that the coordinate positioning device and the computer must be connected by a communication line, which is less flexible to use.

The other type is a wireless coordinate positioning device for data communication between the coordinate positioning device and the computer, which is a wireless technology solution for the problems of the above-mentioned wired coordinate positioning device, and the coordinate positioning device can be flexibly moved. For the battery in the coordinate positioning device, it has to be charged separately, which is also inconvenient to apply.

The technical problem solved by the present invention is to propose a coordinate positioning device, which adopts a combination of wired and wireless connection, and transmits coordinate information to a computer through an interface and a radio frequency method, thereby facilitating identification of coordinate information, which is very Good practicality and operability. The device has the advantages of simple structure, short startup time, low power consumption, low resource occupation and low cost; and can ensure long wireless transmission distance; and has good multi-point network connection capability.

The invention provides a coordinate positioning device, comprising: a coordinate input device, a coordinate indicator, a radio frequency receiver, and a radio frequency transmitter; the coordinate indicator is used for outputting coordinate information, and the coordinate input device is used for recording the coordinate indicator output. Coordinate information; the RF transmitter is disposed on the main board of the coordinate input device, and is used for transmitting coordinate information outputted by the coordinate indicator to the RF receiver; the RF receiver is connected to the computer, and sends the received coordinate information to the computer.

The radio frequency transmitter transmits coordinate information output by the coordinate indicator received by the coordinate input device to the radio frequency receiver, and the radio frequency receiver transmits the received coordinate information to the computer for identification.

The radio frequency receiver is connected to the coordinate input device through a data line, and the coordinate information output by the coordinate indicator received by the coordinate input device is sent to the radio frequency receiver through the data line, and the radio frequency receiver sends the received coordinate information to the computer. For identification.

The main board of the coordinate input device further comprises: a switching circuit, the switching circuit performs switching between active and passive; the power interface transmits the coordinate information and enables the computer to supply power to the main board in an active state; the power module is in The power supply is provided for the main board in the passive state; the charging module is used to charge the power module; the handwriting module is used to input the coordinate information of the coordinate input device; the power interface, the handwriting module, the RF transmitter and the switching circuit are respectively connected by the bus bar structure; The power module is respectively connected with a handwriting module, a radio frequency transmitter, a charging module and a switching circuit; the switching circuit is respectively connected to the charging module and the power interface.

The power interface is an SCI interface.

The radio frequency transmitter includes a first interface, a first single chip, a transmitting module, and a transmitting antenna. The radio frequency receiver includes: a receiving antenna, a receiving module, a second single chip, and a second interface.

The coordinate information outputted by the coordinate indicator is transmitted to the first single chip through the first interface; the first single chip encodes the coordinate information based on the ZigBee standard, and the transmitting antenna controls the transmitting antenna to send the encoded coordinate information to the RF receiver. .

The receiving module controls the coordinate information received by the receiving antenna and transmits the coordinate information to the second single chip microcomputer; the second single chip decodes the coordinate information based on the ZigBee standard, and transmits the decoded coordinate information to the computer through the second interface for identification. .

The radio frequency transmitter has unique identification information, and establishes a correspondence between a radio frequency receiver and a plurality of radio frequency transmitters through a communication protocol.

The transmitting antenna and the receiving antenna are F-type antennas.

The present invention has the following outstanding advantages:

1. There is no wire connection between the coordinate input device and the coordinate indicator of the present invention, and there are two wired and wireless connection modes between the coordinate input device and the computer, and the data communication can be completed through the wired connection of the RF receiver, and the wireless communication can also be performed. The radio frequency method completes the data communication, and the application is convenient and the applicability is strong.

2. In the wired mode, the coordinate input device of the present invention is directly powered by the RF receiver, and no external power supply is required, and the switching circuit of the main board of the coordinate input device automatically disconnects the battery power supply and connects the power supply circuit of the RF receiver. At the same time, the charging circuit automatically charges the battery.

3. In the wired mode, the RF receiver and the coordinate input device are connected to each other through the serial communication interface, thereby realizing the mutual conversion between the wired and wireless working modes, the interface is stable and reliable, the connection is convenient and fast, and the communication efficiency is high.

4. In the wireless working mode, the first single chip and the second single chip of the invention adopt the ZigBee protocol stack, the system structure is simple, the cost is low, the application is very flexible, and the device power consumption is small, the device can not be charged for a long time. The case runs normally. The slave device access time is about 30 milliseconds, the network access time is short, and the effective transmission range is large, and the transmission distance is long.

5. The radio frequency antenna of the invention adopts an F-type antenna, and the receiving and transmitting data has no azimuth element limitation, and has a simple structure and good transmission and reception efficiency.

The coordinate positioning device of the present invention will be further described below with reference to the accompanying drawings.

In the coordinate positioning device according to the embodiment of the present invention, the coordinate input device uses a tablet, the coordinate indicator uses a stylus, and the data bus uses an SCI interface. As shown in the first figure, the coordinate positioning device according to this embodiment includes a tablet 1, a stylus pen 5, a radio frequency receiver 3, and a radio frequency transmitter 2. The stylus pen 5 is used for outputting coordinate information, the tablet 1 is used for recording coordinate information output by the stylus pen 5, the radio frequency transmitter 2 is set on the main board of the tablet 1 , and the radio frequency transmitter 2 is used for outputting the coordinates of the stylus pen 5 The information is sent to the RF receiver 3, and the RF receiver 3 is connected to the computer 4, and transmits the received coordinate information to the computer 4 for identification.

The whole system works in a wired mode and a wireless mode. In the embodiment, the tablet 1 is an electromagnetic induction tablet, and the stylus 5 includes a parallel resonance circuit. When wirelessly connected, the stylus pen 5 generates coordinate information when writing on the tablet 1, and the coordinate information is sent as a signal to the radio frequency receiver 3 through the radio frequency transmitter 2, and the signal received by the radio frequency receiver 3 passes through the second interface ( The second interface (not shown) in this embodiment is a universal serial bus USB port, and the corresponding software installed in the computer 4 identifies the coordinate information, thereby realizing The coordinate information generated by the stylus pen 5 input on the tablet 1 is entered on the computer 4.

When the cable is connected, the RF receiver 3 is connected to the tablet 1 through the data line, and the tablet 1 receives the coordinate information generated when the stylus pen 5 is written. The coordinate information passes through the data line through the power interface (not shown) of the tablet 1 The radio frequency receiver 5 transmits the received data to the computer 4 through the second interface (not shown). In this embodiment, the second interface (not shown) is The universal serial bus USB port, the software installed in the computer 4 performs X, Y coordinates and pressure recognition on the handwritten data, so that the coordinate information generated by the input of the stylus pen 5 on the tablet 1 is recorded on the computer 4.

As shown in the second figure, it is a structural diagram of the tablet motherboard, and the motherboard of the tablet includes a handwriting module 101, a power module 102, a charging module 103, a switching circuit 104, and a second SCI interface 105. The switching circuit 104 performs state switching between active and passive to the main board of the entire tablet. In this embodiment, the power interface is the second SCI interface 105, and the second SCI interface 105 transmits the coordinate information and causes the computer 4 to supply power to the motherboard in an active state. The power module 102 supplies power to the motherboard in a passive state. The charging module 103 charges the power module 102. The handwriting module 101 is used for the stylus pen 5 to input coordinate information.

The second SCI interface 105, the handwriting module 101, the radio frequency transmitter 2, and the switching circuit 104 are respectively connected through the SCI bus bar to transmit coordinate information. The second SCI interface 105 is connected to the switching circuit 104 through a power line. In this embodiment, the power line voltage is 5 volts DC. The switching circuit 104 performs active and passive switching of the entire circuit, and the switching circuit 104 is connected to the charging module 103 and the power module 102, respectively. The charging module 103 is used for charging and connecting with the power module 102. In this embodiment, the voltage of the power module 102 ranges from 3.2 volts to 4.2 volts. The power module 102 is powered by the RF transmitter 2 and the handwriting module 101 in the passive state of the tablet motherboard. In this embodiment, the regulated power supply voltage of the power module 102 is 3.3 VDC.

As shown in the second and fourth figures, when the motherboard of the tablet is in a wireless state, the second SCI interface 105 is not connected to the first SCI interface 305 of the RF receiver 3, and the motherboard is powered by the power module 102 on the motherboard. After the power module 102 is voltage-converted, the RF transmitter 2 and the handwriting module 101 are respectively powered. After the handwriting module 101 collects the coordinate information, the coordinate information is transmitted to the RF transmitter 2 through the SCI bus, the RF transmitter 2 transmits the coordinate information to the RF receiver 3, and the RF receiver 3 receives the coordinate information and passes the RF receiver 3. The second interface 304 provided above is transmitted to the computer 4. The computer 4 recognizes the coordinate information through the corresponding software, thereby realizing the input of the coordinate information by the stylus pen 5 on the tablet.

When the motherboard of the tablet is in a wired state, that is, the first SCI interface 305 of the RF receiver 3 is connected to the second SCI interface 105 of the tablet, and after being switched by the switching circuit 104, the power cable is connected by the second SCI interface 105. The RF transmitter 2 and the handwriting module 101 are powered. At the same time, the power cable connected to the second SCI interface 105 is connected to the charging module 103, so that the charging module 103 charges the power module 102, and the power module 102 is automatically disconnected from the charging module 103 after being fully charged. After the coordinate information is collected in the handwriting module 101, it is transmitted to the second SCI interface 105 through the SCI bus, the second SCI interface 105 transmits the coordinate information to the RF receiver 3, and the RF receiver 3 receives the coordinate information and passes the RF receiver. The second interface 304 provided on the 3 is transmitted to the computer 4. The computer 4 recognizes the coordinate information through the corresponding software, thereby realizing coordinate information input in handwritten form.

When the first SCI interface 305 of the RF receiver 3 is connected to the second SCI interface 105 of the tablet, the SCI bus on the tablet is connected to the second microcontroller 303 of the RF receiver 3. The switching circuit 104 will automatically detect the state of the second SCI interface 105, the switching circuit 104 disconnects the power supply module 102 for the power supply module 102 and the RF transmitter 2, and the charging module 103 charges the power module 102. The line is turned on, so that the charging module 103 charges the power module 102. At the same time, the switching circuit 104 disconnects the SCI bus connected to the RF transmitter 2, and transmits the coordinate information through the second SCI interface 105 on the main board. When the first SCI interface 305 of the RF receiver 3 is disconnected from the second SCI interface 105 of the tablet, the switching circuit 104 will automatically detect the state of the second SCI interface 105, and the switching circuit 104 will use the power module 102 as a handwriting module. The circuit 101 is connected to the power supply line of the RF transmitter 2, so that the power module 102 supplies power to the handwriting module 101 and the RF transmitter 2, and the line that the charging module 103 charges the power module 102 is disconnected; and the switching circuit 104 The SCI bus bar connected to the RF transmitter 2 is connected to transmit coordinate information through the RF transmitter 2.

As shown in the third figure, the radio frequency transmitter 2 includes a first interface 201, a first single chip microcomputer 202, a transmitting module 203, and a transmitting antenna 204. In this embodiment, when the motherboard of the tablet (not shown) is in a wireless state, the RF transmitter 2 is powered by DC 3.3 volts, and is powered by the power module 102 (not shown) on the tablet. Access through the first interface 201. The first interface 201 transmits the coordinate information generated by the user's operation to the first single chip microcomputer 202. The first single chip microcomputer 202 is a ZigBee protocol stack with a frequency band of 2.4 GHz, and adopts the IEEE 802.15.4 standard. The first single chip microcomputer 202 transmits the coordinate information generated by handwriting to the transmitting module 203, and the transmitting module 203 passes the transmitting antenna 204 of the F type. Information is sent.

In this embodiment, the second interface 304 is powered by a USB interface and supplies 5 volts DC. As shown in the fourth figure, the RF receiver 3 includes a receiving antenna 301, a receiving module 302, a second single chip 303, and a second interface 304. The first SCI interface 305 is disposed on the second MCU 303. The receiving antenna 301 adopts an F-shaped antenna. When wirelessly connected, the receiving antenna 301 and the receiving module 302 receive coordinate information transmitted by one or more transmitting antennas 204 (not shown), and the coordinate information is processed by the receiving module 302. The second microcontroller 303 decodes the coordinate information based on the ZigBee standard and transmits the coordinate information to the second interface 304, that is, the universal serial bus USB port is transmitted to the computer 4. When the cable is connected, the first SCI interface 305 is disposed on the second MCU 303, and the first SCI interface 305 receives the coordinate information generated by the writing of the stylus pen 5, and is transmitted to the computer 4 through the second interface 304 via the second MCU 303.

The RF transmitter is solidified with different addresses before leaving the factory. These addresses are solidified on the first microcontroller in the form of a flash chip, which is the unique identification information of the RF transmitter. When wirelessly connected, the second microcontroller of the RF receiver identifies the address that is solidified on the first microcontroller of the RF transmitter through the established communication protocol, and associates one RF receiver with multiple RF transmitters by software installed on the computer. In order to realize simultaneous input of coordinate information by multiple pieces of tablet.

The transmission distance of this device is 10 to 75 meters, which is very suitable for online teaching users. The invention has the advantages of simple structure, short startup time, low power consumption, less resource occupation, low cost, long wireless transmission distance and good multi-point network connection capability.

1. . . writing board

2. . . RF transmitter

3. . . RF receiver

4. . . computer

5. . . Stylus

101. . . Handwriting module

102. . . Power module

103. . . Charging module

104. . . Switching circuit

105. . . Second SCI interface

201. . . First interface

202. . . First single chip

203. . . Sending module

204. . . Transmitting antenna

301. . . Receive antenna

302. . . Receiving module

303. . . Second single chip

304. . . Second interface

305. . . First SCI interface

The first figure is a schematic view of the operation of a coordinate positioning device according to an embodiment of the present invention;

2 is a block diagram of a main board of a coordinate input device of a coordinate positioning device according to an embodiment of the present invention;

The third figure is a structural block diagram of a radio frequency transmitter of a coordinate positioning device according to an embodiment of the present invention;

The fourth figure is a structural block diagram of a radio frequency receiver of a coordinate positioning device according to an embodiment of the present invention.

1. . . writing board

2. . . RF transmitter

3. . . RF receiver

4. . . computer

5. . . Stylus

Claims (6)

A coordinate positioning device, comprising: a coordinate input device, a coordinate indicator, a radio frequency receiver, and a radio frequency transmitter; the coordinate indicator is used to output coordinate information, and the coordinate input device is used to record the coordinate indicator output Coordinate information; the radio frequency transmitter is disposed on the main board of the coordinate input device, and is configured to send coordinate information outputted by the coordinate indicator to the radio frequency receiver; the radio frequency receiver is connected to the computer, and sends the received coordinate information to the computer, wherein The radio frequency receiver can be configured to operate in a wireless mode or a wired mode, wherein in the wireless mode, the radio frequency receiver wirelessly receives coordinate information from the radio frequency transmitter, and in the wired mode, the radio frequency receiver The data line is connected to the coordinate input device, and the coordinate information is received from the coordinate input device through the data line. According to the coordinate positioning device of claim 1, wherein: the main board of the coordinate input device further includes a switching circuit, the switching circuit performs switching between active and passive; the power interface transmits the coordinate information and In the active state, the computer supplies power to the motherboard; the power module supplies power to the motherboard in a passive state; the charging module charges the power module; the handwriting module provides coordinate information for the coordinate input device; the power interface, handwriting The module, the RF transmitter and the switching circuit are respectively connected by a bus bar structure; the power module is respectively connected with a handwriting module, a radio frequency transmitter, a charging module and a switching circuit; and the switching circuit is respectively connected to the charging module and the power interface. The coordinate setting according to any one of claims 1 to 2 of the patent application scope The bit device, wherein: the power interface is an SCI interface. The coordinate positioning device of claim 1, wherein: the radio frequency transmitter comprises a first interface, a first single chip, a transmitting module and a transmitting antenna; and the radio frequency receiver comprises: a receiving antenna and a receiving module. The second MCU and the second interface; the coordinate information outputted by the coordinate indicator is transmitted to the first MCU through the first interface; the first MCU encodes the coordinate information based on the ZigBee standard, and the transmitting module controls the transmitting antenna to encode The coordinate information is output to the RF receiver; the receiving module controls the receiving antenna to receive the coordinate information sent by the RF transmitter, and transmits the coordinate information to the second single chip microcomputer; the second single chip decodes the coordinate information based on the ZigBee standard, and passes the second The interface outputs the decoded coordinate information to a computer for identification. The coordinate positioning device according to claim 3, wherein the radio frequency transmitter has unique identification information, and a correspondence relationship between the radio frequency receiver and the plurality of radio frequency transmitters is established through a communication protocol. The coordinate positioning device according to claim 3, wherein the transmitting antenna and the receiving antenna are F-type antennas.