CN106374967A - SPI interface Internet of things wireless transceiver based on SX127X chip - Google Patents
SPI interface Internet of things wireless transceiver based on SX127X chip Download PDFInfo
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- CN106374967A CN106374967A CN201610951468.8A CN201610951468A CN106374967A CN 106374967 A CN106374967 A CN 106374967A CN 201610951468 A CN201610951468 A CN 201610951468A CN 106374967 A CN106374967 A CN 106374967A
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- circuit
- sx127x
- spi interface
- sx127x chip
- signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Abstract
The invention provides an SPI interface Internet of things wireless transceiver based on an SX127X chip. The technical problems of short communication distance, poor anti-interference ability and the like in the prior art are solved. The transceiver comprises an SX127X chip capable of carrying out lora demodulation on a received signal and/or carrying out lora modulation on a transmission signal. The SX127X chip is provided with an SPI interface. The SX127X chip is connected with the output end of a received signal processing circuit and the input end of the transmission signal processing circuit. The input end of a received signal processing circuit and the output end of the transmission signal processing circuit are connected with a receiving and transmission switching switch. The receiving and transmission switching switch is connected with a wireless signal transmission/receiving device. The SPI interface Internet of things wireless transceiver provided by the invention has the advantages of long communication distance, simple circuit, strong anti-interference ability, low power consumption, high reliability and the like, and can adapt to complicated environments. A lot of nodes can be connected with the SPI interface Internet of things wireless transceiver. Communication interference among different nodes can be reduced.
Description
Technical field
The invention belongs to transceiver technologies field, especially relate to a kind of spi interface Internet of Things based on sx127x chip
Wireless transceiver.
Background technology
Wireless transceiver hardware platform adopts the communication mode of fsk and gfsk and the anti-interference skill based on frequency hopping mostly at present
Art, subject matter is that its communication distance is shorter, only enable 1km about visual range transceiving data, if environment have stronger
The indexs such as the distance of interference, the success rate of transmitting-receiving and transmitting-receiving will substantially reduce；But also existing many using module, circuit is multiple
Miscellaneous, error rate is high, and the number of nodes that can be attached thereto is few, the problems such as power consumption is high.
In order to solve the problems, such as prior art, people have carried out long-term exploration it is proposed that solution miscellaneous
Scheme.For example, Chinese patent literature discloses a kind of super low-power consumption for Internet of Things short-range wireless connectivity radio node and receives
Send out machine [application number: 201210517565.8], including transmitter circuitry and receiver circuit, described transmitter circuitry includes: lc
Voltage controlled oscillator and pre-divider are used for producing CF signal；Signal modulator is by square wave modulates baseband signals to CF signal
Form transmission signal；Power amplifier is used for amplifying transmission signal；Described receiver circuit includes: low-noise amplifier and radio frequency
Automatic gain amplifier is used for amplifying the signal receiving；For the signal of amplification is demodulated out；Analog-digital converter will demodulate
Analogue signal be converted to digital signal.
Although such scheme to some extent solves the high problem of prior art power consumption, the program still exists
: communication distance is shorter, many using module, circuit is complicated, and error rate is high, the number of nodes that can be attached thereto few it is impossible to adapt to
Complex environment, the problems such as poor anti jamming capability.
Content of the invention
The purpose of the present invention is for the problems referred to above, provides a kind of reasonable in design, structure simple, communication distance length based on
The spi interface wireless transceiver for Internet of Things of sx127x chip.
For reaching above-mentioned purpose, present invention employs following technical proposal: this spi interface Internet of Things based on sx127x chip
Net wireless transceiver, including can carry out lora demodulation and/or carry out lora modulation to sending signal to receipt signal
Sx127x chip, described sx127x chip is provided with spi interface, and described sx127x chip is processed with receipt signal respectively
The outfan of circuit is connected with the input of emissioning signal treatment circuit, the described input of receipt signal process circuit and sending out
Penetrate the outfan of signal processing circuit respectively with receive transmitting switching switch and be connected, described reception transmitting switching switch with wirelessly
Signal receiving/transmission device is connected, and described reception transmitting switching switch can select at wireless signal transceiver and receipt signal
Reason circuit is connected or is connected with emissioning signal treatment circuit.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described sx127x chip
Pin one and pin two connect high level or low level respectively thus selecting the emission mode of sx127x chip or receiving mould
Formula, when selecting the emission mode of sx127x chip, described reception transmitting switching switch by wireless signal transceiver and is sent out
Penetrate signal processing circuit to be connected；Or, when selecting the reception pattern of sx127x chip, described reception transmitting switching switch will
Wireless signal transceiver is connected with receipt signal process circuit.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described reception transmitting switches
It is provided with 50 ohm of matched filtering circuit between switch and wireless signal transceiver.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described wireless signal is received and dispatched
Device is antenna, and described antenna is connected with 50 ohm antenna interfaces, and 50 described ohm antenna interfaces mate filter with 50 ohm
Wave circuit is connected, and 50 described ohm antenna interfaces are connected with antenna detection circuit, and described antenna detection circuit is detecting
The connection of emissioning signal treatment circuit and sx127x chip is cut off in the connection of antenna and 50 ohm antenna interfaces after disconnecting.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described receipt signal is processed
Circuit is to receive match circuit.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described transmission signal is processed
Circuit includes launching match circuit and transmitting filter circuit, the described input of transmitting match circuit and sx127x chip phase
Even, and the described outfan of transmitting match circuit is connected with the input of transmitting filter circuit, described transmitting filter circuit
Outfan with receive transmitting switching switch be connected.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, described sx127x chip, connect
Receive signal processing circuit, emissioning signal treatment circuit, reception transmitting switching switch and 50 ohm of matched filtering circuit to be arranged at
In radome.
Above-mentioned based in the spi interface wireless transceiver for Internet of Things of sx127x chip, on described sx127x chip
It is provided with dio0-dio4 pin and reset pin.
Compared with prior art, the advantage of this spi interface wireless transceiver for Internet of Things based on sx127x chip is:
Long transmission distance, reliability is technical grade, strong antijamming capability, CFS center frequency stabilization, and receiving sensitivity is high, and second harmonic is low,
Communication distance is remote, low in energy consumption；There is simple external control interface, can directly be connected with outside mcu；Applied range, is suitable for
Various application terminals node in low-power consumption wide area network；Running voltage width, can be normally steady under the running voltage of 1.8-3.7v
Fixed work；Support the communication of lora debugging mode and the communication of the modulating mode such as gfsk, fsk, msk, gmsk, ook, there is lead code
The means of communication such as detection, automated radio frequency perception, wireless awakening, crc verification；Working band width, in 433mhz-443mhz, 470-
In the frequency range of 510mhz, 510-518mhz, 859-871mhz, 900-930mhz, property indices can Reliable guarantee；Maximum
Transmission power is 100mw；Link budget reaches as high as 168dbm；Receiving sensitivity reaches as high as -148dbm；Emission current≤
120ma, receives electric current≤13ma, sleep current≤2ua；Adopt spi interface with outside mcu data communication, can be directly and outside
Mcu is connected, and software programming is very convenient；It is wirelessly transferred maximum communication rate and can reach 300kbps；Transmitting is more than 10km；
Small volume, the apparent size without antenna is 25 × 17mm.
Brief description
Fig. 1 provides the structural representation of the embodiment of the present invention.
In figure, power input 6,50 ohm antenna interfaces 7, antenna detection circuit 8, antenna 9, power supply circuits 10, crystal oscillator
And match circuit 11, transmitting match circuit 12, transmitting filter circuit 13, reception transmitting switching 14,50 ohm of matched filterings of switch
Circuit 15, reception match circuit 16, sx127x chip 17, spi interface 18, dio0-dio4 pin 20, reset pin 21.
Specific embodiment
As shown in figure 1, this spi interface wireless transceiver for Internet of Things based on sx127x chip, including the collection of letters can be docked
Number sx127x chip 17 carrying out lora demodulation and/or sending signal being carried out with lora modulation, sx127x chip 17 is provided with spi
Interface 18, and sx127x chip 17 respectively with the outfan of receipt signal process circuit and the input of emissioning signal treatment circuit
It is connected, the input of receipt signal process circuit and the outfan of emissioning signal treatment circuit launch switching switch with receiving respectively
14 is connected, receives transmitting switching switch 14 and is connected with wireless signal transceiver, and reception transmitting switching switch 14 can select
Wireless signal transceiver is connected with receipt signal process circuit or is connected with emissioning signal treatment circuit.Power input 6
For 3.3v DC source, technology is closed using rational capacitor decoupling, reduce the ripple impact of external input power；Power supply circuits
1 adopts rational inductance, capacitor decoupling to close technology, reduces the ripple impact of external input power；Crystal oscillator and match circuit 11
Ensure that the stability of module centers frequency and the concordance producing medium frequency, thus indirectly improve the communication performance of module.
Specifically, the pin one of sx127x chip 17 and pin two connect high level or low level respectively thus selecting
The emission mode of sx127x chip 17 or reception pattern, when selecting the emission mode of sx127x chip 17, receive transmitting and cut
Change switch 14 wireless signal transceiver is connected with emissioning signal treatment circuit；Or, when connecing of selection sx127x chip 17
During receipts pattern, receive transmitting switching switch 14 and wireless signal transceiver is connected with receipt signal process circuit, sx127x core
Piece 17 is provided with dio0-dio4 pin 2 and reset pin 21.The pin one of sx127x chip 17 and pin two can be with outsides
Mcu is connected, then outside mcu passes through the simple io mouth operation i.e. emission mode of optional sx127x chip 17 or receives mould
Formula；Outside mcu can be resetted to module by reset pin 21；Outside mcu can be obtained by dio0-dio4 pin 2
The various information of sx127x chip 17；Outside mcu can be operated to sx127x chip 17 by spi interface 18；User leads to
Cross that outside mcu carries out to this wireless transceiver receiving, launches, sleeps, speed, power etc. meet multiple operations of module performance,
Thus when avoiding being directly connected to by peripheral apparatus between the two or more products needing within the scope of module efficient communication to communicate
Problem in issuable line configuring, improves the comprehensive competitive power of a whole set of products simultaneously.
For the circuit part of this wireless transceiver, receive and set between transmitting switching switch 14 and wireless signal transceiver
There are 50 ohm of matched filtering circuit 15；Receipt signal process circuit is to receive match circuit 16；Emissioning signal treatment circuit includes
Transmitting match circuit 12 and transmitting filter circuit 13, the input of transmitting match circuit 12 is connected with sx127x chip 17, and sends out
The outfan penetrating match circuit 12 is connected with the input of transmitting filter circuit 13, launches outfan and the reception of filter circuit 13
Transmitting switching switch 14 is connected.50 ω matched filtering circuit improve the matching of module relative antenna 9 when receiving and launching, from
And effectively increase transmission power, antenna 9 to the radiation efficiency of power and receiving sensitivity；Receiving match circuit 16 can have
Effect ground filtering harmonics, suppression decay, receiving terminal sensitivity is -148dbm；Transmitting match circuit 12 can suppress secondary effectively
Harmonic wave, improves efficiency of transmission, and transmission power reaches as high as 20dbm, and property indices more conform to relevant authentication requirement；Transmitting
Filter circuit 13 assumes matching transmission to the frequency signal in passband, and stop-band frequency SLM Signal Label Mismatch is carried out with transmitting decay, and
Can filtering harmonics and suppression decay effectively.
Further, wireless signal transceiver is antenna 9, and antenna 9 is connected with 50 ohm antenna interfaces 7,50 ohm of skies
Line interface 7 is connected with 50 ohm of matched filtering circuit 15, and 50 ohm antenna interfaces 7 are connected with antenna detection circuit 8, antenna detection
Circuit 8 cut-out emissioning signal treatment circuit and sx127x core after connection antenna 9 and 50 ohm antenna interfaces 7 is detected disconnects
The connection of piece 17, sx127x chip 17, receipt signal process circuit, emissioning signal treatment circuit, reception transmitting switching switch 14
It is arranged in radome with 50 ohm of matched filtering circuit 15.50 ohm antenna interface 7 support pcb antenna 9, spring antenna 9,
The various forms antennas 9 such as glue stick antenna 9, sucker antenna 9, copper rod antenna 9, tempering antenna 9；The main radio frequency of this wireless transceiver
Part radome covers all around, and does good earth process, greatly reduces the impact to module performance for the outside high-frequency noise.
The groundwork mechanism of this spi interface wireless transceiver for Internet of Things based on sx127x chip is: needs communication
Data passes through spi interface 18, is sent to this wireless transceiver with spi data form, digital signal is passed through by this wireless transceiver
It is loaded in required frequency range after the modulation of the debud modes such as lora, 2-fsk, gfsk, ook, send in the form of an electromagnetic wave.When
After this wireless transceiver receives valid wireless signal, through the demodulation process of analog portion, then the place entering numerical portion
Reason, finally by spi interface 18 by the data output receiving.
Lora modulating mode can realize extra long distance radio communication and high anti-jamming capacity in the case of low-power consumption.Perfect
Solve the problems, such as super long range communication in complex environment for the small data quantity.It is this that wireless module signal sensitivity exceedes -148dbm
The power amplifier that high sensitivity combines+20dbm makes industrial link budget reach optimum, disclosure satisfy that the model of all application requirements
Enclose and reliability.The integrated performance with selection also there is great significance to improve, solves tradition compared with conventional modulated technology
Design needs to need to make the problem of compromise that is to say, that it has communication in communication range, capacity of resisting disturbance and power consumption
Scope is big, strong antijamming capability, superior function low in energy consumption.Lora has merged digital spread spectrum, Digital Signal Processing and forward direction and has entangled
Miscoding technology, has unprecedented performance.Before this, only those high-grade wireless industrial telecommunications can merge these skills
Art, using the lora modulation technique design from military tactical communication system, the situation of the embedded radio communications field there occurs
Thoroughly change.Forward error correction coding technology is to increased some redundancies in data to be transmitted sequence, and so, data passes
The wrong code element being input into injection in journey will be corrected in time in receiving terminal.This technology decreases conventional establishment " selfreparing " number
The demand to retransmit according to bag, and performance is good in the sudden error code solving to be caused by multipath fading.Once packet is grouped
Set up and inject forward error correction coding to ensure reliability, these packets will be sent in digital spread-spectrum modulation device.This
One manipulator, by bit feed-in one " spread device " each in packet data package, each bit-time is divided into numerous codes
Piece.After lora modem is configured, the scope that can divide is 64-4096 chip/bit.Angelblocks configuration modulation
Demodulator can be using the highest spreading factor in 4096 chips/bit.Comparatively, the scope that zigbee is only capable of dividing is 10-
12 chips/bit.By using high spreading factor, low capacity data can be passed by lora technology by large-scale radio-frequency spectrum
Output is gone.In fact, when you are measured by spectrum analyzer, these data appear as noise, but difference is that noise is
Incoherent, and data has dependency, based on this, data can essentially be extracted from noise.In fact, spread spectrum because
Son is higher, and more data can extract from noise.In a gfsk receiving terminal running well, the minimum signal to noise ratio of 8db
(snr) need reliably demodulated signal, by the way of configuration angelblocks, lora can demodulate a signal, its signal to noise ratio
For -20db, gfsk mode is 28db with this result gap, and this is equivalent to scope and distance expands a lot.Environment out of doors
Under, the gap of 6db just can realize 2 times of original transmission ranges.In order to effectively contrast transmission range between different technologies
Performance, we are using a quantitative target being called " link budget ".Link budget includes affecting receiving end signal intensity
Each variable, includes transmission power in its simplification system and adds receiving terminal sensitivity.The transmission power of angelblocks is
100mw (20dbm), receiving terminal sensitivity is -129dbm, and total link budget is 149db.Comparatively, have sensitivity-
The gfsk wireless technology of 110dbm (this has been its fabulous data), needs the power (37dbm) of 5w to can be only achieved identical chain
Road estimated value.In practice, most gfsk wireless technology receiving terminal sensitivity can reach -103dbm, in this situation, transmitting terminal
Tranmitting frequency is necessary for 46dbm or about 36w, can be only achieved the link budget similar with lora.Therefore, using lora skill
Art we wider array of transmission range and distance can be obtained with low transmitting power, this low-power consumption wide area technology is exactly needed for us
's.Compared with fsk system, using same low cost crystal when this new spread spectrum mode improve 30db in sensitivity,
Be equivalent to the transmission range that increased 5 times in theory.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Although more employ herein power input 6,50 ohm antenna interfaces 7, antenna detection circuit 8, antenna 9,
Power supply circuits 10, crystal oscillator and match circuit 11, transmitting match circuit 12, transmitting filter circuit 13, receive transmitting switching switch 14,
50 ohm of matched filtering circuit 15, receive match circuit 16, sx127x chip 17, spi interface 18, dio0-dio4 pin 20,
Reset pin 21 grade term, but it is not precluded from the probability using other terms.It is used for the purpose of more convenient using these terms
Describe and explain the essence of the present invention；Being construed as any additional restriction is all to disagree with spirit of the present invention
's.
Claims (8)
1. a kind of spi interface wireless transceiver for Internet of Things based on sx127x chip is it is characterised in that include docking the collection of letters
Number sx127x chip (17) carrying out lora demodulation and/or sending signal being carried out with lora modulation, described sx127x chip
(17) be provided with spi interface (18), and described sx127x chip (17) respectively with the outfan of receipt signal process circuit and
The input of emissioning signal treatment circuit is connected, the described input of receipt signal process circuit and emissioning signal treatment circuit
Outfan respectively with receive transmitting switching switch (14) and be connected, described reception transmitting switching switch (14) and wireless signal receipts
Transmitting apparatus are connected, and described reception transmitting switching switch (14) can select wireless signal transceiver to process with receipt signal
Circuit is connected or is connected with emissioning signal treatment circuit.
2. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 1 it is characterised in that
The described pin one of sx127x chip (17) and pin two connect high level or low level respectively thus selecting sx127x core
The emission mode of piece (17) or reception pattern, when selecting the emission mode of sx127x chip (17), described reception is launched
Wireless signal transceiver is connected by switching switch (14) with emissioning signal treatment circuit；Or, when selection sx127x chip
(17), during reception pattern, wireless signal transceiver is processed electricity with receipt signal by described reception transmitting switching switch (14)
Road is connected.
3. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 2 it is characterised in that
Described reception transmitting switching switch (14) is provided with 50 ohm of matched filtering circuit (15) and wireless signal transceiver between.
4. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 3 it is characterised in that
Described wireless signal transceiver is antenna (9), and described antenna (9) is connected with 50 ohm antenna interfaces (7), described 50
Ohm antenna interface (7) is connected with 50 ohm of matched filtering circuit (15), and 50 described ohm antenna interfaces (7) are connected with antenna
Testing circuit (8), described antenna detection circuit (8) is in connection disconnection antenna (9) and 50 ohm antenna interfaces (7) is detected
The connection of cut-out emissioning signal treatment circuit and sx127x chip (17) afterwards.
5. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 1 or 2 or 3 or 4, its
It is characterised by, described receipt signal process circuit is to receive match circuit (16).
6. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 5 it is characterised in that
Described emissioning signal treatment circuit includes launching match circuit (12) and transmitting filter circuit (13), and described transmitting coupling is electric
The input on road (12) is connected with sx127x chip (17), and the described outfan of transmitting match circuit (12) and transmitting filtering
The input of circuit (13) is connected, and the described outfan of transmitting filter circuit (13) switchs (14) phase with receiving transmitting switching
Even.
7. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 3 or 4, its feature exists
In described sx127x chip (17), receipt signal process circuit, emissioning signal treatment circuit, receiving transmitting switching switch
(14) and 50 ohm of matched filtering circuit (15) are arranged in radome.
8. the spi interface wireless transceiver for Internet of Things based on sx127x chip according to claim 1 or 2 or 3 or 4, its
It is characterised by, described sx127x chip (17) is provided with dio0-dio4 pin (20) and reset pin (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610951468.8A CN106374967A (en) | 2016-10-26 | 2016-10-26 | SPI interface Internet of things wireless transceiver based on SX127X chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610951468.8A CN106374967A (en) | 2016-10-26 | 2016-10-26 | SPI interface Internet of things wireless transceiver based on SX127X chip |
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| CN106374967A true CN106374967A (en) | 2017-02-01 |
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| CN201610951468.8A Pending CN106374967A (en) | 2016-10-26 | 2016-10-26 | SPI interface Internet of things wireless transceiver based on SX127X chip |
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Cited By (5)
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| CN107155209A (en) * | 2017-07-21 | 2017-09-12 | 河南卓正电子科技有限公司 | Asymmetric LoRa communication systems and its control method |
| CN107508615A (en) * | 2017-09-28 | 2017-12-22 | 河南卓正电子科技有限公司 | A kind of LoRa communication modules and its control method |
| CN108259061A (en) * | 2018-01-16 | 2018-07-06 | 成都福兰特电子技术股份有限公司 | A kind of adjustable Internet of Things communication micro energy lose chip and its control method |
| CN109661081A (en) * | 2018-12-18 | 2019-04-19 | 温州大学 | The control system that street lamp remotely controls is realized based on 6LoWPAN technology |
| CN114567369A (en) * | 2022-02-21 | 2022-05-31 | 北京国电高科科技有限公司 | Half-duplex data forwarding method and system for satellite Internet of things |
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| CN109661081A (en) * | 2018-12-18 | 2019-04-19 | 温州大学 | The control system that street lamp remotely controls is realized based on 6LoWPAN technology |
| CN114567369A (en) * | 2022-02-21 | 2022-05-31 | 北京国电高科科技有限公司 | Half-duplex data forwarding method and system for satellite Internet of things |
| CN114567369B (en) * | 2022-02-21 | 2022-11-22 | 北京国电高科科技有限公司 | Half-duplex data forwarding method and system for satellite Internet of things |
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