CN104734785A - Visible light receiving device and method - Google Patents
Visible light receiving device and method Download PDFInfo
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- CN104734785A CN104734785A CN201510037003.7A CN201510037003A CN104734785A CN 104734785 A CN104734785 A CN 104734785A CN 201510037003 A CN201510037003 A CN 201510037003A CN 104734785 A CN104734785 A CN 104734785A
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Abstract
The invention discloses a visible light receiving device. The visible light receiving device comprises a photodiode, a USB interface and a shell. The photodiode is arranged on the shell. The shell is provided with the USB interface. An amplifying circuit, a band-pass filtering circuit, a frequency discriminating circuit, a waveshaping circuit, a microcontroller and a USB conversion circuit are arranged in the shell. The signal output end of the photodiode is connected with the signal input end of the amplifying circuit. The signal output end of the amplifying circuit is connected with the signal input end of the frequency discriminating circuit through the band-pass filtering circuit. The signal output end of the frequency discriminating circuit is connected with the signal input end of the microcontroller through the waveshaping circuit. The signal output end of the microcontroller is connected with the USB interface through the USB conversion circuit. According to the visible light receiving device, a microprocessor is connected with the upper computer through the USB interface, the program of the microcontroller can be altered according to different protocols, the visible light receiving device is made to be capable of identifying data signals under different communication protocols, and great convenience is provided to researches on the visible light communication protocols.
Description
Technical field
The present invention relates to visible light communication field, particularly relate to a kind of visible ray receiving system and visible ray method of reseptance.
Background technology
Visible light communication (Visible Light Communication, VLC) technology is a kind of wireless access wide band technology.The optical signal transmission data message of the imperceptible high speed scintillation of naked eyes that transmitting terminal is sent by light-emitting diode or fluorescent lamp etc., receiving terminal carries out the detection of light signal by photodetector etc., obtains the data message of transmission.The preferably selection that indoor wireless communication can meet the demands is exactly white light LEDs, and it is while providing room lighting, is used as communication light source and is expected to realize the access of indoor wireless high-speed data.Radio wave only accounts for a very little part in whole electromagnetic spectrum, and along with user is to the growth of wireless Internet demand, available radio spectrum is just fewer and feweri, and visible light spectrum is not utilized and supervises, and it can be utilized to communicate.At present, the consensus standard of visible light communication is not also determined, a lot of researcher is in this problem of consideration, but lacking a kind of device conveniently can study communication protocol.
Summary of the invention
The object of this invention is to provide a kind of visible ray receiving system and visible ray method of reseptance, energy download online program, online change communication protocol, makes the research of visible light communication agreement convenient.
The technical solution used in the present invention is:
A kind of visible ray receiving system, comprise photodiode, USB interface and housing, photodiode is arranged on housing, housing is provided with USB interface, amplifying circuit is provided with in housing, bandwidth-limited circuit, frequency-discriminating circuit, shaping circuit, microcontroller and USB change-over circuit, the signal output part of described photodiode connects the signal input part of amplifying circuit, the signal output part of amplifying circuit connects the signal input part of frequency-discriminating circuit by bandwidth-limited circuit, the signal output part of frequency-discriminating circuit connects the signal input part of microcontroller by shaping circuit, the signal output part of microcontroller connects USB interface by USB change-over circuit.
Described photodiode is also provided with collector lens outward, and collector lens is fixed on housing.
Also comprise mains switch, mains switch is arranged on housing.
Also comprise power supply indicator, the signal input part of power supply indicator is connected with the signal output part of microcontroller, and be used to refer to the electrifying condition of this device, power supply indicator is arranged on housing.
Also comprise signal lamp, the signal input part of signal lamp is connected with the signal output part of microcontroller, and be used to refer to the Signal transmissions situation of this device, signal lamp is arranged on housing.
The chip model that described microcontroller adopts is STC15W204S.
The model that described frequency-discriminating circuit master chip adopts is LM331.
A kind of visible ray method of reseptance, described visible ray method of reseptance comprises:
First step, is converted into the signal of telecommunication by photodiode by light signal;
Second step, is amplified the faint signal of telecommunication by amplifying circuit;
Third step, by bandwidth-limited circuit filtering low-frequency noise and high frequency spurs, extracts two kinds of carrier signals;
4th step, is converted to voltage signal by frequency-discriminating circuit by carrier signal;
5th step, is converted into the TTL signal of standard by voltage signal by shaping circuit;
6th step, is identified the TTL signal received according to related protocol by microprocessor, extracts, and data is sent according to usb protocol;
Data transformations is that the discernible signal of host computer sends to host computer by USB change-over circuit by the 7th step.
The step being collected visible light signal by collector lens was also comprised before first step.
In the present invention, in visible ray receiving system, microprocessor is connected with host computer by USB interface, can according to different protocol modification micro-controller program, data-signal under making visible ray receiving system can identify different communication protocol, for the research of visible light communication agreement provides a great convenience.The data that this device receives pass to host computer by USB interface, and USB interface to host computer power taking, can be powered without the need to independent in addition.
The advantages such as in the present invention, light signal is converted into the discernible data of host computer by amplifying circuit, frequency-discriminating circuit, shaping circuit, microprocessor etc. by visible ray method of reseptance, and the method has simply, applicability is strong.
Accompanying drawing explanation
Fig. 1 is the structural representation of visible ray receiving system of the present invention;
Fig. 2 is the schematic block circuit diagram of visible ray receiving system of the present invention;
Fig. 3 is the oscillogram of the work for illustration of visible ray receiving system of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, be clearly and completely described technical scheme of the present invention, described execution mode is only the present invention's part execution mode, instead of whole execution modes.Based on the execution mode in the present invention, those of ordinary skill in the art, not making the every other execution mode obtained under creative work prerequisite, belong to the scope of protection of the invention.
As illustrated in fig. 1 and 2, the present invention includes collector lens 2, photodiode 7, USB interface 5, mains switch 1, power supply indicator 3, signal lamp 4 and housing 6, photodiode 7 is arranged on housing 6, housing 6 one end is provided with USB interface 5, amplifying circuit is provided with in housing 6, bandwidth-limited circuit, frequency-discriminating circuit, shaping circuit, microcontroller and USB change-over circuit, the signal output part of described photodiode 7 connects the signal input part of amplifying circuit, the signal output part of amplifying circuit connects the signal input part of frequency-discriminating circuit by bandwidth-limited circuit, the signal output part of frequency-discriminating circuit connects the signal input part of microcontroller by shaping circuit, the signal output part of microcontroller connects USB interface 5 by USB change-over circuit, power supply indicator 3 is all connected with microcontroller with signal lamp 4, power supply indicator 3 indicates the power-up state of this visible ray receiving system, signal lamp 4 is used to refer to signals transmission.Collector lens 2 is used for collecting visible light signal, increases signal strength signal intensity.Mains switch 1 is used for controlling to power on to this visible ray receiving system.
Amplifying circuit is used for the small-signal that photodiode 7 receives to amplify, thus makes small-signal grow, is convenient to the process of subsequent conditioning circuit, and what also increase this device can Received signal strength distance.
Bandwidth-limited circuit is used for filtering low-frequency noise and high frequency spurs, extracts two kinds of carrier signals.
Frequency-discriminating circuit master chip adopts LM331, and the signal of different carrier can be converted to voltage signal by it, and carrier frequency is different, then output voltage varies in size, thus frequency signal can be converted into voltage signal.
Design a comparison circuit in shaping circuit, arrange reference voltage, two kinds of varying voltage signal binaryzations that frequency-discriminating circuit can be exported, are then " 1 " higher than reference voltage, are then " 0 ", thus signal is converted into standard TTL signal lower than reference voltage.
Microcontroller model is STC15W204S, and it is used for receiving TTL signal, and carries out identifying, extracting according to related protocol, and data is sent according to usb protocol.Microcontroller can be connected with host computer by USB interface 5, realizes programmable functions, and energy download online program, thus the data-signal under making visible ray receiving system can identify different communication protocol, make functional diversities.
USB change-over circuit is used for receiving the data that microcontroller exports, and is converted into the discernible signal of host computer and sends to host computer, and host computer also can be downloaded to microcontroller by USB change-over circuit.
USB interface 5 is used for connecting with host computer, and USB interface 5 agreement is identical with host computer USB interface agreement.USB interface 5 to host computer power taking, can be powered to visible ray receiving system.USB interface 5 can also connect a USB data line, is connected on host computer, adds the flexibility that visible ray receiving system is placed.
Operation principle and the visible ray method of reseptance of visible ray receiving system of the present invention are: first visible light signal converges on photodiode 7 through collector lens 2, photodiode 7 receives the signal that bright back light goes out, and through amplifying circuit, small-signal is amplified, bandwidth-limited circuit filtering clutter, only leave two kinds of carrier waves of the different frequency of modulation, two kinds of carrier signals are converted into two kinds of voltage signals by frequency-discriminating circuit, two kinds of voltage signals are converted into the TTL signal of standard by shaping circuit, the signal received identifies by microcontroller, data extract by the communication protocol according to defining in advance, eventually pass USB change-over circuit and signal is passed to host computer by USB interface 5, host computer is by software receipt data and show.
As shown in Figure 3, be the signal waveforms after partial circuit process provided by the invention, it comprises filtered signal waveform a, the signal waveform b after frequency discrimination and the signal waveform c after shaping.V in Fig. 3
hfor the magnitude of voltage that high frequency carrier is corresponding, V
lfor the magnitude of voltage that low frequency carrier signal is corresponding, V
reffor the reference voltage level in shaping circuit.
Claims (9)
1. a visible ray receiving system, it is characterized in that: comprise photodiode, USB interface and housing, photodiode is arranged on housing, housing is provided with USB interface, amplifying circuit is provided with in housing, bandwidth-limited circuit, frequency-discriminating circuit, shaping circuit, microcontroller and USB change-over circuit, the signal output part of described photodiode connects the signal input part of amplifying circuit, the signal output part of amplifying circuit connects the signal input part of frequency-discriminating circuit by bandwidth-limited circuit, the signal output part of frequency-discriminating circuit connects the signal input part of microcontroller by shaping circuit, the signal output part of microcontroller connects USB interface by USB change-over circuit.
2. a kind of visible ray receiving system according to claim 1, is characterized in that: described photodiode is also provided with collector lens outward, and collector lens is fixed on housing.
3. a kind of visible ray receiving system according to claim 1 and 2, it is characterized in that: also comprise mains switch, mains switch is arranged on housing.
4. a kind of visible ray receiving system according to claim 3, it is characterized in that: also comprise power supply indicator, the signal input part of power supply indicator is connected with the signal output part of microcontroller, and be used to refer to the electrifying condition of this device, power supply indicator is arranged on housing.
5. a kind of visible ray receiving system according to claim 4, it is characterized in that: also comprise signal lamp, the signal input part of signal lamp is connected with the signal output part of microcontroller, and be used to refer to the Signal transmissions situation of this device, signal lamp is arranged on housing.
6. a kind of visible ray receiving system according to claim 4 or 5, is characterized in that: the chip model that described microcontroller adopts is STC15W204S.
7. a kind of visible ray receiving system according to claim 6, is characterized in that: the model that described frequency-discriminating circuit master chip adopts is LM331.
8. a visible ray method of reseptance, is characterized in that, described visible ray method of reseptance comprises:
First step, is converted into the signal of telecommunication by photodiode by light signal;
Second step, is amplified the faint signal of telecommunication by amplifying circuit;
Third step, by bandwidth-limited circuit filtering low-frequency noise and high frequency spurs, extracts two kinds of carrier signals;
4th step, is converted to voltage signal by frequency-discriminating circuit by carrier signal;
5th step, is converted into the TTL signal of standard by voltage signal by shaping circuit;
6th step, is identified the TTL signal received according to related protocol by microprocessor, extracts, and data is sent according to usb protocol;
Data transformations is that the discernible signal of host computer sends to host computer by USB change-over circuit by the 7th step.
9. a kind of visible ray method of reseptance according to claim 9, be is characterized in that: before first step, also comprise the step being collected visible light signal by collector lens.
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| CN201510037003.7A CN104734785B (en) | 2015-01-26 | 2015-01-26 | A kind of visible optical pickup apparatus and visible method for optical reception |
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| CN201510037003.7A CN104734785B (en) | 2015-01-26 | 2015-01-26 | A kind of visible optical pickup apparatus and visible method for optical reception |
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| CN104734785B CN104734785B (en) | 2018-04-10 |
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| CN105043985A (en) * | 2015-08-04 | 2015-11-11 | 宁波摩米创新工场电子科技有限公司 | Multistage symmetric amplification type digital photoelectric detection system |
| CN105181597A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | High speed difference based digital photoelectric detection system |
| CN105180997A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | Low-pass filter amplifying digital photoelectrical detecting system |
| CN105180996A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | Digitization photoelectrical detection system |
| CN105180979A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | High-speed differential digital photoelectrical detecting system based on linear modulation and demodulation circuit |
| CN106919530A (en) * | 2017-03-20 | 2017-07-04 | 邬东强 | A kind of one-way transmission component based on visible ray |
| CN108234027A (en) * | 2017-12-26 | 2018-06-29 | 佛山市南海区联合广东新光源产业创新中心 | A kind of reception device suitable for visible light communication |
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Cited By (9)
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|---|---|---|---|---|
| CN105043985A (en) * | 2015-08-04 | 2015-11-11 | 宁波摩米创新工场电子科技有限公司 | Multistage symmetric amplification type digital photoelectric detection system |
| CN105181597A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | High speed difference based digital photoelectric detection system |
| CN105180997A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | Low-pass filter amplifying digital photoelectrical detecting system |
| CN105180996A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | Digitization photoelectrical detection system |
| CN105180979A (en) * | 2015-08-04 | 2015-12-23 | 宁波摩米创新工场电子科技有限公司 | High-speed differential digital photoelectrical detecting system based on linear modulation and demodulation circuit |
| CN105180997B (en) * | 2015-08-04 | 2018-06-26 | 宁波摩米创新工场电子科技有限公司 | A kind of low-pass filtering amplifying type digital photoelectric detecting system |
| CN106919530A (en) * | 2017-03-20 | 2017-07-04 | 邬东强 | A kind of one-way transmission component based on visible ray |
| CN106919530B (en) * | 2017-03-20 | 2024-03-19 | 邬东强 | Unidirectional transmission assembly based on visible light |
| CN108234027A (en) * | 2017-12-26 | 2018-06-29 | 佛山市南海区联合广东新光源产业创新中心 | A kind of reception device suitable for visible light communication |
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