CN105554911A - Wireless sensor network communication system based on Wi-Fi - Google Patents
Wireless sensor network communication system based on Wi-Fi Download PDFInfo
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- CN105554911A CN105554911A CN201510995514.XA CN201510995514A CN105554911A CN 105554911 A CN105554911 A CN 105554911A CN 201510995514 A CN201510995514 A CN 201510995514A CN 105554911 A CN105554911 A CN 105554911A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention relates to a wireless sensor network communication system based on Wi-Fi belonging to the communication technical field of the industrial wireless internet of things. The system comprises a Wi-Fi wireless concentrator and a Wi-Fi wireless sensor node; the Wi-Fi wireless concentrator receives the data collected by the Wi-Fi wireless sensor node through Wi-Fi and sends the data to an upper computer through the Ethernet. According to the invention, a Wi-Fi communication module and a main control module are connected through an SDIO interface; the transmission rate of the communication interface reaches 100Mbit/s; the communication rate of the Wi-Fi module and the main control module is ensured; the Wi-Fi wireless sensor node can collect three kinds of different environment parameters and transmits the data to the concentrator in real time through an Ad-Hoc networking mode; and the data is transmitted to the upper computer through the concentrator.
Description
Technical field
The invention belongs to wireless industrial Internet of Things communication technical field, relate to a kind of network communication of wireless sensor system based on Wi-Fi.
Background technology
Radio sensing network is made up of a large amount of wireless sensor nodes, the physical message of surrounding can be responded to by these sensor nodes, as temperature, humidity and smog etc., and they are converted into radio signal send to wireless network base station, wireless network base station wirelessly forwards the data to distance host again.Wireless sensor network has the features such as low cost, low-power consumption, microminiaturization, has now been widely used in the various fields such as environment, national defence, traffic, has had broad application prospects.
What the wireless sensor data transport module that current wireless sensor network uses extensively adopted is ZigBee equipment, and this can be good at the application requirement meeting the overwhelming majority.But, along with progressively going deep into of research, its networking is more complicated, and when the node of wireless sensor network need the data volume of transmission larger far away from transmission range time, the message transmission rate that ZigBee equipment the is lower and bottleneck of whole network performance will be become compared with short transmission distance.Wi-Fi technology exactly all has advantage at transmission rate, transmission range and node networking, and has higher data transmission credibility and internet security.
Wi-Fi radio communication has very high transfer rate, and transmission range is wide, can be applicable in the multimedia integration transmission such as image, voice, video; Networking is convenient, both independently can set up network, also can pass through the existing network of wireless access AP; Transmission is reliable, and Wi-Fi technology makes network service reliable by a series of conflict avoidance and retransmission mechanism; Radiation is little, and in agreement, regulation transmitting power is no more than 100mW, applies fool proof, can be widely used in some special industrial environments.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of network communication of wireless sensor system based on Wi-Fi, this system adopts SDIO interface to connect Wi-Fi communication module and main control module, communication interface transmission rate reaches 100Mbit/s, ensure that the communication speed of Wi-Fi module and main control module; Wi-Fi sensor node can gather three kinds of different environmental parameters, and by the networking model of Ad-Hoc, real-time for data is passed to concentrator, by concentrator, data is passed to host computer.
For achieving the above object, the invention provides following technical scheme:
Based on a network communication of wireless sensor system of Wi-Fi, this system comprises Wi-Fi radio concentrator and Wi-Fi wireless sensor node; The data that described Wi-Fi radio concentrator is collected by Wi-Fi reception Wi-Fi wireless sensor node, and by Ethernet, data are sent to host computer.
Further, described Wi-Fi radio concentrator comprises: governor circuit module, electric power management circuit, Wi-Fi communication module, serial port circuit, SW debugging interface, ethernet interface circuit;
Described governor circuit module is connected with Wi-Fi communication module by SDIO interface, completes the configuration to Wi-Fi communication module relevant parameter, realizes data transmit-receive, be connected by SPI interface with ethernet interface circuit, realize the communication function of concentrator and host computer; Described power management module respectively module each with governor circuit, Wi-Fi communication module and ethernet PHY controller is connected, for whole equipment provides stable voltage; Described Wi-Fi communication module realizes wireless data transceiving by PCB antenna; Described serial port circuit passes through RS232 serial port chip and governor circuit model calling, for system debug; Described SW debugging interface is used for microcontroller chip programming code and program debugging; Described ethernet interface circuit is communicated with host computer by Ethernet, realizes data transmit-receive.
Further, described Wi-Fi wireless sensor node comprises: governor circuit module, comprise electric power management circuit, Wi-Fi communication module, serial port circuit, SW debugging interface, sensor circuit;
Described governor circuit module is connected with Wi-Fi communication module by SDIO interface, completes the configuration to Wi-Fi communication module relevant parameter, realizes data transmit-receive, by being connected with sensor circuit, receives and process sensor data; Described power management module respectively module each with governor circuit, Wi-Fi communication module and ethernet PHY controller is connected, for whole equipment provides stable voltage; Described Wi-Fi communication module realizes wireless data transceiving by PCB antenna; Described serial port circuit passes through RS232 serial port chip and governor circuit model calling, for system debug; Described SW debugging interface is used for microcontroller chip programming code and program debugging; Described sensor circuit, for gathering environmental parameter, is sent to governor circuit module
Beneficial effect of the present invention is: the present invention adopts SDIO interface to connect Wi-Fi communication module and main control module, and this communication interface transmission rate reaches 100Mbit/s, ensure that the communication speed of Wi-Fi module and main control module; Wi-Fi sensor node can gather three kinds of different environmental parameters, and by the networking model of Ad-Hoc, real-time for data is passed to concentrator, by concentrator, data is passed to host computer.
Accompanying drawing explanation
In order to make object of the present invention, technical scheme and beneficial effect clearly, the invention provides following accompanying drawing and being described:
Fig. 1 is the structure of Wi-Fi wireless sensor network;
Fig. 2 is Wi-Fi radio sensing network communication equipment software and hardware structure block diagram;
Fig. 3 is the connected mode of STM32 and Wi-Fi communication module;
Fig. 4 is Wi-Fi concentrator main program flow chart;
Fig. 5 is Wi-Fi Temperature Humidity Sensor node software flow chart.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Accompanying drawing 1 is the structure of Wi-Fi wireless sensor network of the present invention, and as shown in the figure, native system forms primarily of Wi-Fi wireless sensor node, Wi-Fi concentrator and computer.Described Wi-Fi wireless sensor node comprises transducer acquisition system, STM32 microcontroller and Wi-Fi communication module; Described Wi-Fi concentrator comprises Wi-Fi communication module, STM32 microcontroller and ethernet communication module; Described computer is the backstage of wireless sensor network; Described transducer acquisition system gathers environmental parameter by transducer; Described STM32 is the data that controller energy receiving sensor collects, and can process data; Described Wi-Fi communication module can send the data of microcontroller, can receive the data that Wi-Fi communication module receives;
The point-to-point connection of Ad-Hoc Model Establishment is adopted between Wi-Fi wireless sensor node and Wi-Fi concentrator, after transducer acquisition system collects environmental parameter by transducer, data are passed to STM32 microcontroller, by microcontroller data processed and store, after microcontroller receives the order of the reading data that concentrator is sent through Wi-Fi communication module, through SDIO interface, data are sent to Wi-Fi communication module, data message is sent through Wi-Fi.
After the Wi-Fi communication module of concentrator receives data message, STM32 microcontroller is sent data to through SDIO interface, microcontroller is resolved the data message received and is verified, verify by after data are stored in array, when microcontroller receive computer through Ethernet to send reading data order after, the data be stored in array are sent to ethernet communication module through SPI interface, are sent to far-end computer through Ethernet.
Accompanying drawing 2 is Wi-Fi radio sensing network communication equipment software and hardware structure block diagram, primarily of Wi-Fi concentrator software and hardware part and Wi-Fi wireless sensor node software and hardware part composition.
Described Wi-Fi concentrator hardware components comprises STM32F205 microcontroller, Wi-Fi communication module, electric power management circuit, ethernet interface circuit, serial port circuit, SW debug i/f circuit, antenna.
Described Wi-Fi concentrator software part comprises application program, embedded real-time operating system uC/OS-II, LwIP protocol stack, uIP protocol stack, Wi-Fi driving, serial port drive, ethernet communication driving.
Described Wi-Fi wireless sensor node comprises STM32F205 microcontroller, Wi-Fi communication module, electric power management circuit, serial port circuit, SW debugging interface, sensor circuit, antenna.
Described Wi-Fi wireless sensor node software section comprises application program, embedded real-time operating system uC/OS-II, LwIP protocol stack, Wi-Fi driving, serial port drive, transducer driving.
The STM32F205 microcontroller of described Wi-Fi concentrator and Wi-Fi wireless sensor node mainly comprises clock circuit, start-up circuit and reset circuit.
Clock circuit: clock circuit uses two external crystal-controlled oscillation to provide clock source for system, and one is 8MHz high speed outer clock, one is the low speed external clock of 32.768kHz.8MHz external clock is the cpu clock of acquiescence, for system provides clock accurately.Low speed external clock is the real-time clock of system, for system provides the precision clock source of low-power consumption.
Start-up circuit: BOOT0 and BOOT1 two pins of STM32 chip can be selected to start from SRAM or start from other interfaces such as serial ports.After system reset, selected the start-up mode of chip by the pin arranging BOOT0 and BOOT1, when BOOT0 keeps low level, STM32 chip is accessed from user's flash memories; When BOOT0 keeps high level, when BOOT1 is low level, then start from the interface such as serial ports or CAN; When BOOT0 and BOOT1 is high level, then start from built-in SRAM.The present invention arranges BOOT1 and is always 0, embedded SRAM would not be entered like this start, because when starting from SRAM, nested vector interrupt controller (NVIC must be used in system initialization code, NestedVectoredInterruptController) exception table and offset register, remap vector table in sram, process more complicated.Microcontroller STM32F205 internal program memory capacity for this project selection is very large, therefore directly uses user's flash memories.BOOT0 is connect low level, and no matter BOOT1 meets high level VCC or low level GND, is all to start from user Flash program storage.
Reset circuit: STM32F205 inside possesses reset circuit, can realize electrification reset and power-off reset, and in order to realize the reliability of system, the present invention adds a button and resets in outside.Except external reset, house dog counter stop time and software reset and low-power consumption management reset can initiating system reset produce.
Accompanying drawing 3 is the connected mode of STM32 and Wi-Fi communication module, the present invention has higher traffic rate to make Wi-Fi network communication of wireless sensor equipment, SDIO interface communication is adopted between microprocessor STM32 and Wi-Fi communication module, this transmission rate of communication interface can reach 100Mbit/s, compared with SPI interface communication, SDIO communication interface is more stable, and speed is faster.The interface of SDIO always has 6 lines, a command transfer line, a clock transfer line, four single data transmission lines.
CLK: microprocessor STM32 provides clock signal by CLK to Wi-Fi communication module, makes SDIO interface and Wi-Fi communication module clock synchronous, and within cycle time, completes the transmission of CMD or DATA.
All orders of CMD:SDIO and command response are all transmitted by CMD.Order can only be sent by the SDIO controller of host and STM32.
DATA [3:0]: 4 bit patterns or 1 bit pattern that can realize SDIO.At 4 bit patterns, transfer of data is by 4 data pin (DATA [3:0]), and 4 SDIO patterns provide maximum data transmission bauds, can reach 100Mbit/s.Under 1 bit pattern, data are transmitted by means of only DATA [0].
SDIO interface needs driver normally to work, and described SDIO interface driver mainly comprises interface initialization and interface data transmitting-receiving.
Described SDIO interface initialization has two steps, is respectively SDIO recognition of devices and SDIO equipment enters data-transmission mode:
SDIO recognition of devices:
STM32 host reset SDIO equipment, and verify the operating voltage of SDIO equipment and the address of inquiry SDIO equipment.The transmission of all data of this process has all been come by CMD line.
1) reset of SDIO equipment
When after SDIO device power, SDIO equipment just enters Idle state.
2) operating voltage checking
The operational voltage value of SDIO equipment stores in a register.As long as main frame and SDIO equipment voltage matches, SDIO equipment will enter ReadyState pattern, and STM32 main frame and Wi-Fi communication module could proper communications.In order to judge whether the operating voltage of SDIO equipment meets, need call mmc_send_if_cond () function and sending CMD8 order, according to SDIO equipment CMD8 command response, main frame confirms whether the operating voltage of SDIO equipment mates the SDIO of main frame.As long as voltage matches SDIO equipment enters ReadyState pattern, otherwise main frame just retransmits CMD8 order, until SDIO equipment is ready to.
3) SDIO recognition of devices process
After SDIO equipment enters ReadyState pattern, call SDIO_GetResponse () function and send the cid information that CMD2 order obtains SDIO equipment, as long as SDIO equipment is in ReadyState pattern, SDIO equipment will transmit its cid information on the CMD line of SDIO interface, and then SDIO equipment just enters IdentificationState pattern.Then the relative address that mmc_send_relative_addr () function sends CMD3 command set SDIO equipment is called.SDIO equipment enters Stand-byState pattern after receiving this address.
Data-transmission mode:
After entering Stand-byState pattern, main frame first ceaselessly sends the CSD register information that CMD9 order obtains SDIO equipment.CMD4 order, for arranging the DSR register of SDIO equipment, comprises data SDIO width, SDIO frequency etc.CMD7 order is used for making SDIO equipment enter transmission mode.
1) SDIO equipment enters sending mode
The sending mode of SDIO equipment can be stopped by CMD12 order, and SDIO equipment enters transmission mode afterwards.The read command of main frame comprises that monolithic reads (CMD17), polylith is read (CMD18).
2) SDIO equipment enters receiving mode
The receiving mode of SDIO equipment can be stopped by CMD12 order, and the write order of main frame comprises that monolithic writes (CMD24), polylith is write (CMD25).After write order is transmitted, SDIO equipment enters TransferState pattern.
Described SDIO interface data transmitting-receiving function realizes the data communication of microprocessor and Wi-Fi communication module, and table 1 is SDIO interface data transmitting-receiving function.
Table 1SDIO data transmit-receive function interface
| Function name | Function performance |
| uint8_t sdio_readb(int fn,unsigned int addr,int*err_ret) | Complete the reading of the byte to SDIO equipment |
| void sdio_writeb(int fn,ub,unsigned int addr,int err_ret) | Complete the write of the byte to SDIO equipment |
| int sdio_readsb(void*dst,unsigned int addr,int count) | Read the data flow of FIFO in SDIO equipment |
| int sdio_writesb(unsigned int addr,void*src,int count) | Write data flow to FIFO in SDIO equipment |
Accompanying drawing 4 is Wi-Fi concentrator main program flow chart, when after Wi-Fi concentrator power-up initializing, creates system manager's business, Wi-Fi communication task, ethernet communication task respectively.System is responsible for the utilance of adding up current C PU.Wi-Fi concentrator main program performs the Wi-Fi communication task that Wi-Fi wireless sensor node communicates with Wi-Fi concentrator afterwards, circulate to transducer and send the order of reading image data, after the response of Wi-Fi wireless sensor node, the data collected are delivered to concentrator, Wi-Fi concentrator stores after carrying out data processing in short-term.When Wi-Fi concentrator receives the reading data command of host computer transmission, then Wi-Fi concentrator performs the ethernet communication task that host computer communicates with Wi-Fi concentrator, in the buffer area storing data, corresponding information is extracted according to the order issued, and then by Ethernet interface uploading data.
Accompanying drawing 5 is Wi-Fi Temperature Humidity Sensor node software flow chart, and after initialization Temperature Humidity Sensor, microcontroller STM32 sends transmission command to Temperature Humidity Sensor.Be specially and the I/O pin PB9 (SCK) of microcontroller STM32 is exported high level, PB8 (DATA) is become low level from high level, then PB9 (SCK) pin is dragged down, after time delay a period of time, PB9 (SCK) pin is drawn high, and at PB9 (SCK) for PB8 (DATA) being raised during high level.Then send order to transducer, order comprises 3 address bits (000) and 5 command bits, after this order sends to transducer, reads the return value (0 for receiving normally, and 1 for taking defeat) of SHT10 when the 9th SCK cycle.
After Temperature Humidity Sensor correctly receives the transmission start order of microcontroller STM32 transmission, microcontroller STM32 will transmit temperature and humidity measurement order " 000111 " or " 000101 " to Temperature Humidity Sensor.For showing that sensor measurement completes, come interim at the 8th SCK signal, Temperature Humidity Sensor can make DATA signal be low level, now, microcontroller STM32 needs to restart SCK signal, then Temperature Humidity Sensor can return the temperature value (humidity value) of two bytes and a byte CRC check and.After reading the data of transducer, data will be sent to concentrator by Wi-Fi communication module by node.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (3)
1. based on a network communication of wireless sensor system of Wi-Fi, it is characterized in that: this system comprises Wi-Fi radio concentrator and Wi-Fi wireless sensor node; The data that described Wi-Fi radio concentrator is collected by Wi-Fi reception Wi-Fi wireless sensor node, and by Ethernet, data are sent to host computer.
2. a kind of network communication of wireless sensor system based on Wi-Fi according to claim 1, is characterized in that: described Wi-Fi radio concentrator comprises: governor circuit module, electric power management circuit, Wi-Fi communication module, serial port circuit, SW debugging interface, ethernet interface circuit;
Described governor circuit module is connected with Wi-Fi communication module by SDIO interface, completes the configuration to Wi-Fi communication module relevant parameter, realizes data transmit-receive, be connected by SPI interface with ethernet interface circuit, realize the communication function of concentrator and host computer; Described power management module respectively module each with governor circuit, Wi-Fi communication module and ethernet PHY controller is connected, for whole equipment provides stable voltage; Described Wi-Fi communication module realizes wireless data transceiving by PCB antenna; Described serial port circuit passes through RS232 serial port chip and governor circuit model calling, for system debug; Described SW debugging interface is used for microcontroller chip programming code and program debugging; Described ethernet interface circuit is communicated with host computer by Ethernet, realizes data transmit-receive.
3. a kind of network communication of wireless sensor system based on Wi-Fi according to claim 1, is characterized in that: described Wi-Fi wireless sensor node comprises: governor circuit module, comprise electric power management circuit, Wi-Fi communication module, serial port circuit, SW debugging interface, sensor circuit;
Described governor circuit module is connected with Wi-Fi communication module by SDIO interface, completes the configuration to Wi-Fi communication module relevant parameter, realizes data transmit-receive, by being connected with sensor circuit, receives and process sensor data; Described power management module respectively module each with governor circuit, Wi-Fi communication module and ethernet PHY controller is connected, for whole equipment provides stable voltage; Described Wi-Fi communication module realizes wireless data transceiving by PCB antenna; Described serial port circuit passes through RS232 serial port chip and governor circuit model calling, for system debug; Described SW debugging interface is used for microcontroller chip programming code and program debugging; Described sensor circuit, for gathering environmental parameter, is sent to governor circuit module.
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Cited By (1)
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| CN110832887A (en) * | 2018-11-30 | 2020-02-21 | 深圳市大疆创新科技有限公司 | Internal communication link system and unmanned aerial vehicle |
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