CN103490814A - Serial communication device of USB interface LED visible light and system thereof - Google Patents
Serial communication device of USB interface LED visible light and system thereof Download PDFInfo
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- CN103490814A CN103490814A CN201310446529.1A CN201310446529A CN103490814A CN 103490814 A CN103490814 A CN 103490814A CN 201310446529 A CN201310446529 A CN 201310446529A CN 103490814 A CN103490814 A CN 103490814A
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Abstract
The invention provides a serial communication device of USB interface LED visible light and a system of the serial communication device. The communication device comprises LED light-emitting sending portions and photosensitive diode receiving portions, wherein the LED light-emitting sending portions and the photosensitive diode light receiving portions are installed on a plurality of computers through USB-RS232 patch cords respectively to form the communication system. According to the communication system, light signals are sent and received to achieve asynchronous communication among the computers.
Description
Technical field
The invention belongs to free space visible ray (FSO) communications field, particularly the design of USB interface LED visible ray serial communication system.
Background technology
The LED volume is little, power is low, long service life.Its brightness is high, and heat is low, sturdy and durable.Compare traditional lighting lamp pearl, LED has the outstanding features such as more power saving, durable, environmental protection.Its light efficiency of great power LED is three generations's light source in advance.Except general advantage, the great power LED operating current is larger, and brightness is also higher, and the time of lighting is the nanosecond rank.These characteristics all make great power LED become one of selection of visible light communication light source.
Fiber broadband has started to enter resident family.As the main flow of optical communication, optical fiber communication is more ripe.But indoor visible light communication is still in initial research.Because LED light source has the good linearity, Many researchers has been made the achievement in research of a lot of FSO with LED, comprise a large amount of theoretical simulation and part of test results.
In any case the visible illumination communications applications of LED has obtained experiment and has confirmed.People concentrate on LED array and PD array and improve transmission rate and communication quality.The purpose of these systems is to improve as far as possible bandwidth.But its system configuration is more complicated, the portability of application and selectivity are not good.
Summary of the invention
For the problems referred to above, a kind of USB interface LED visible ray serial communication apparatus provided by the invention and system thereof, based on optical transceiver module is coupled with the computer interfaceJi Suanjijiekou change-over circuit respectively, utilize the hot plug of USB interface, make light-receiving, sending module to be connected to efficiently computer, realize asynchronous communication between two or multiple computers, carry out the small documents transmission, the transfer files form is not limit, thereby provides a kind of Apparatus and system simple in structure, has and preferably applies portability and selectivity.Simultaneously, the LED lamp can be thrown light on, and flicker frequency is higher than the human eye limiting frequency.
For achieving the above object, this provides a kind of convenient USB interface LED visible ray serial communication apparatus and system thereof can use following design:
The invention provides a kind of USB interface LED visible ray serial communication apparatus, comprise: LED light sending part and photodiode light receiver, by DC power supply, powered, respectively by USB ?the RS232 patchcord be arranged on plural platform computer, utilize the sending and receiving light signal to realize asynchronous communication between plural platform computer, it is characterized in that: LED light sending part is comprised of the driving of MAX232 level switch module, the first NAND gate, LED and optical modulating circuit, light source led, and the photodiode light receiver comprises photodiode optical receiver and the second NAND gate, and access MAX232 level switch module in parallel, wherein, therein the USB in USB interface LED visible ray serial communication apparatus ?the RS232 patchcord connect MAX232 level switch module and computer, computer transmitting serial port level signal through USB ?after the RS232 patchcord, the MAX232 level switch module is converted to the Transistor-Transistor Logic level signal by the serial ports level signal, by the Transistor-Transistor Logic level signal through in the first not gate, being input to the driving of LED and the modulation that optical modulating circuit is realized light signal after oppositely, and driving light source LED, send light signal, after being arranged on photodiode light receiver in the USB interface LED visible ray serial communication apparatus on another computer and receiving light signal, produce the Transistor-Transistor Logic level signal by the photodiode optical receiver, access MAX232 level translator after the second NAND gate is anti-phase, finally by USB ?the RS232 patchcord by computer, received, complete the asynchronous communication between computer.
USB interface LED visible ray serial communication apparatus involved in the present invention, the method that the driving of the LED of LED light sending part and optical modulating circuit adopt binary system to open and close monitoring is modulated light signal.
Further, the driving of LED and optical modulating circuit comprise that a plurality of triodes are formed in parallel, the base stage of triode in parallel is by the signal sending end of the first NAND gate access MAX232 level translator, be connected light source led between the emitter of triode in parallel and collector electrode, for driving light source LED, the signal voltage that the MAX232 level translator produces is realized modulation through the switch motion of triode in parallel.
In addition, the present invention provides a kind of USB interface LED visible ray serial communication system simultaneously, be arranged on respectively plural platform computer by plural platform USB interface LED visible ray serial communication apparatus, and the USB interface LED visible ray serial communication apparatus utilized is realized asynchronous communication between plural platform computer by the sending and receiving light signal.
In such scheme, two or many computers are equipped with the driver of patchcord in advance, and serial communication assistant software, and corresponding ports is set.
The present invention is by the software control of computer COM Debug Assistant, and signal transmission is through the patchcord of USB-RS232, passes to driving and the optical modulating circuit of single great power LED after anti-phase, forms optical transmission module.Receiving circuit has adopted small size photodiode receiver module, is transferred to computer after in conjunction with the patchcord of USB-RS232, signal being processed, then obtains target information by the COM Debug Assistant software decode.This USB interface LED visible ray serial communication system has realized that light source and receiver are 1 meter of distance, and in the situation of fixed-direction, between the computer that two or many possess USB interface, carries out the small documents transmission.Communication mode is asynchronous communication.
The accompanying drawing explanation
Fig. 1 is the structure chart of USB interface LED visible ray serial communication apparatus and system thereof;
Fig. 2 is driving and the optical modulating circuit connection layout of the LED of USB interface LED visible ray serial communication apparatus;
Fig. 3 is the detailed connection layout of optical transceiver module of USB interface LED visible ray serial communication apparatus;
Fig. 4 is the oscilloscope schematic diagram of transmission experiment.
Embodiment
Below in conjunction with accompanying drawing, a kind of man-machine collaboration device based on the inductor video camera involved in the present invention and the preferred embodiment of system thereof are elaborated, but the present invention is not limited in this embodiment.In order to make the public have thoroughly and understand the present invention, in the following preferred embodiment of the present invention, describe concrete details in detail.
The structure chart that Fig. 1 is USB interface LED visible ray serial communication apparatus and system thereof.
As shown in Figure 1, the minimum unit of USB interface LED visible ray serial communication system 10 comprises two USB interface LED visible ray serial communication apparatus 100 of communication mutually.
LED light sending part is by the driving of MAX232 level switch module 101, the first NAND gate 106, LED and optical modulating circuit 103, light source led, and light source LED 108 forms, and is powered by 5V DC power supply 102.USB-RS232 connecting line 105 connects computer and MAX232 level translator 101, and transducer 101 is converted to the Transistor-Transistor Logic level signal by the serial ports level signal.After conversion, signal is input to modulator 103, and the LED light signal is modulated.
The photodiode light receiver comprises photodiode optical receiver 104 and the second NAND gate 107,5V DC power supply 102 is powered to the photodiode light receiving part simultaneously, supply with PD optical receiver 104 and level switch module 101, PD optical receiver 104 is access MAX232 level translators 101 in parallel.The PD optical receiver 104 of another USB interface LED visible ray serial communication apparatus 100, be photodiode optical receiver receiving optical signals after, extracting signal is that Transistor-Transistor Logic level is input to MAX232 level translator 101, received by another computer through USB-RS232 patchcord 105 again, by the COM Debug Assistant software decode, obtain target information.System can be carried out duplex communication.Thereby the USB interface LED visible ray serial communication apparatus 100 utilized is realized asynchronous communication between plural platform computer by the sending and receiving light signal.
Driving and the optical modulating circuit connection layout of the LED that Fig. 2 is USB interface LED visible ray serial communication apparatus.
As Fig. 2 shows, the driving of LED and optical modulating circuit 103 comprise: the 2N2907 triode of three parallel connections, and constant current driving light source LED, the light source luminescent diode 108.The base stage access point of the 2N2907 triode of three parallel connections connects the signal sending end of MAX232 level translator 101, between the emitter of triode in parallel and collector electrode, is connected light source LED 108.The signal voltage V produced by MAX232 level translator 101
i, control light source led, be the modulation that light source luminescent diode 108 break-makes realize light signal as switch through the anti-phase rear drive triode of the first NAND gate 106.Two parts form the OOK modulation circuit, are that the method that the binary system keying is monitored is modulated light signal.Voltage inversion is for the auxiliary light illumination function that realizes.Be connected light source led between the emitter of triode in parallel and collector electrode
The detailed connection layout of optical transceiver module that Fig. 3 is USB interface LED visible ray serial communication apparatus.
As shown in Figure 3, PD optical receiver 104 produces the Transistor-Transistor Logic level signals, through the second NAND gate anti-107 mutually after the direct MAX232 level translator 101 that accesses in parallel.Because modulation signal is through anti-phase processing, so the anti-phase reduction of the NAND gate here is necessary.MAX232 level translator 101 is converted to by rs 232 serial interface signal the TTL signal that circuit can be identified, and uses data transmission end and receiving terminal during communication, for other status signals of serial ports, adopts the measure of local terminal loopback to connect and set up with acquiescence.
Serial communication assistant's transmission is set between 1～10ms interval time, and the light flash frequency is 100～1000Hz.Can be thrown light on.Transmitting terminal software is written into picture file waiting for transmission, at receiving terminal software, sets file format and path.After transmission, the receiving terminal automatic reception is preserved.
The oscilloscope schematic diagram that Fig. 4 is transmission experiment
As shown in Figure 4, input character in sending frame, choose Data duplication and send, and the oscilloscope result shows the oscillogram transmitted and receive data, the waveform that wherein Sig0 is transmitting terminal, and the waveform that Sig1 is receiving terminal shows.During Transmit message, choose " enabling the file data source ", to the purpose file, choose purpose file " LOGO.jpg of school ", before transmission, transmitting terminal and receiving terminal concordance file form are reached common understanding, i.e. agreement.Receiving terminal is chosen " reception turns to file ", sets up file " logo.jpg " under assigned catalogue, clicks and sends.Receiving terminal receives complete file, and once communication complete.
Above embodiment is only for illustrating technological thought of the present invention and characteristics; its purpose is to make those skilled in the art can understand content of the present invention and implement according to this; can not only with the present embodiment, limit the scope of the claims of the present invention; be all according to disclosed spirit, do be equal to replacement, improvement etc., all should be included in protection scope of the present invention.
Claims (4)
1. a USB interface LED visible ray serial communication apparatus, comprise: LED light sending part and photodiode light receiver, by DC power supply, powered, respectively by USB ?the RS232 patchcord be arranged on plural platform computer, utilize the sending and receiving light signal to realize asynchronous communication between plural platform computer, it is characterized in that:
Described LED light sending part is comprised of the driving of MAX232 level switch module, the first NAND gate, LED and optical modulating circuit, light source led; And
Described photodiode light receiver comprises photodiode optical receiver and the second NAND gate, and and connect described MAX232 level switch module;
Wherein, therein the described USB in USB interface LED visible ray serial communication apparatus ?the RS232 patchcord connect described MAX232 level switch module and computer, computer transmitting serial port level signal through described USB ?after the RS232 patchcord, described MAX232 level switch module is converted to the Transistor-Transistor Logic level signal by described serial ports level signal, described Transistor-Transistor Logic level signal is input to the driving of described LED and the modulation that optical modulating circuit is realized light signal after described the first NAND gate is reverse, and drive described light source led, send light signal
After being arranged on photodiode light receiver in the USB interface LED visible ray serial communication apparatus on another computer and receiving described light signal, produce the Transistor-Transistor Logic level signal by the photodiode optical receiver, access MAX232 level translator after described the second NAND gate is anti-phase, finally by USB ?the RS232 patchcord by computer, received, complete the asynchronous communication between computer.
2. USB interface LED visible ray serial communication apparatus according to claim 1 is characterized in that:
Wherein, the method that the driving of the LED of described LED light sending part and optical modulating circuit adopt binary system to open and close monitoring is modulated light signal.
3. USB interface LED visible ray serial communication apparatus according to claim 1 is characterized in that:
Wherein, the driving of described LED and optical modulating circuit comprise that a plurality of triodes are formed in parallel, the base stage of the triode of described parallel connection accesses the signal sending end of described MAX232 level translator by described the first NAND gate, be connected described light source led between the emitter of the triode of described parallel connection and collector electrode, for driving described light source led, the signal voltage that described MAX232 level translator produces is realized modulation through the switch motion of the triode of described parallel connection.
4. a USB interface LED visible ray serial communication system is characterized in that:
In plural platform claim 1～3, the described USB interface LED visible ray of any one serial communication apparatus is arranged on respectively plural platform computer, and utilizes described USB interface LED visible ray serial communication apparatus to realize asynchronous communication between plural platform computer by the sending and receiving light signal.
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| CN103763031A (en) * | 2014-01-27 | 2014-04-30 | 惠州Tcl移动通信有限公司 | Communication terminal and communication system achieving communication through visible light |
| CN104485995A (en) * | 2014-12-15 | 2015-04-01 | 昆山国显光电有限公司 | Light fidelity access device |
| CN105245276A (en) * | 2015-09-14 | 2016-01-13 | 中国人民解放军信息工程大学 | Visible light communication technology-based transmission apparatus and system |
| CN105245273A (en) * | 2015-08-27 | 2016-01-13 | 桂林理工大学 | RS232 and VLC protocol conversion method capable of illumination equalization |
| CN105897335A (en) * | 2016-06-02 | 2016-08-24 | 复旦大学 | USB interface communication handheld transmitting and receiving device based on visible light communication technology |
| CN108321158A (en) * | 2018-04-11 | 2018-07-24 | 南京邮电大学 | Static random access memory (sram) cell and preparation method thereof based on photoelectric device |
| CN110209617A (en) * | 2019-05-10 | 2019-09-06 | 中国电力科学研究院有限公司 | A kind of UART serial ports Transistor-Transistor Logic level communicates two-way physics monitoring system and method |
| US20210281327A1 (en) * | 2020-03-03 | 2021-09-09 | Canon Kabushiki Kaisha | Terahertz wave camera system, entry/exit management apparatus, and method for controlling terahertz wave camera system |
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| CN104485995A (en) * | 2014-12-15 | 2015-04-01 | 昆山国显光电有限公司 | Light fidelity access device |
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| CN105245276B (en) * | 2015-09-14 | 2018-02-09 | 中国人民解放军信息工程大学 | A kind of transmission equipment and system based on visible light communication technology |
| CN105897335A (en) * | 2016-06-02 | 2016-08-24 | 复旦大学 | USB interface communication handheld transmitting and receiving device based on visible light communication technology |
| CN108321158A (en) * | 2018-04-11 | 2018-07-24 | 南京邮电大学 | Static random access memory (sram) cell and preparation method thereof based on photoelectric device |
| CN108321158B (en) * | 2018-04-11 | 2024-04-16 | 南京邮电大学 | Static random access memory unit based on photoelectric device and preparation method thereof |
| CN110209617A (en) * | 2019-05-10 | 2019-09-06 | 中国电力科学研究院有限公司 | A kind of UART serial ports Transistor-Transistor Logic level communicates two-way physics monitoring system and method |
| US20210281327A1 (en) * | 2020-03-03 | 2021-09-09 | Canon Kabushiki Kaisha | Terahertz wave camera system, entry/exit management apparatus, and method for controlling terahertz wave camera system |
| US11621788B2 (en) * | 2020-03-03 | 2023-04-04 | Canon Kabushiki Kaisha | Terahertz wave camera system, entry/exit management apparatus, and method for controlling terahertz wave camera system |
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