CN201262702Y - Wireless sensor network node based on Bluetooth - Google Patents

Wireless sensor network node based on Bluetooth Download PDF

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Publication number
CN201262702Y
CN201262702Y CN 200720081863 CN200720081863U CN201262702Y CN 201262702 Y CN201262702 Y CN 201262702Y CN 200720081863 CN200720081863 CN 200720081863 CN 200720081863 U CN200720081863 U CN 200720081863U CN 201262702 Y CN201262702 Y CN 201262702Y
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China
Prior art keywords
node
sensor
bluetooth
module
network node
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Expired - Fee Related
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CN 200720081863
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Chinese (zh)
Inventor
江虹
李磊民
黄玉清
楚红雨
韩宾
王姮
聂诗良
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Southwest University of Science and Technology
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Southwest University of Science and Technology
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Abstract

The utility model provides a wireless sensor network node based on Bluetooth, comprising a sensor module, a main control module, a environment information memory module, a Bluetooth wireless communication module and a power module; the sensor module consists of three basic sensor units: a temperature sensor unit, a humidity sensor unit and a brightness sensor unit, and an extension sensor interface and can collect the information of various environments; and the main control module processes the collected environment information and controls the Bluetooth wireless communication module to complete the transmission of the information. The system combines the Bluetooth technique, ARM technique and the sensor technique and the designed wireless sensor network node has the advantages of high reliability, good extensibility, smart network assembly, low cost, low power consumption, and the like.

Description

Wireless sensor network node based on bluetooth
1, technical field
The utility model relates to a kind of wireless sensor network node, and the information transmission of this equipment is used for the monitoring of environmental information based on Bluetooth Communication Technology, belongs to the interdisciplinary field of the communication technology and control technology.
2, background technology
Wireless sensor network (Wireless Sensor Networks WSNs) system is current receive much concern in the world, relate to multidisciplinary height intersection, the integrated hot research field, forward position of knowledge height.It combines sensor technology, embedded computing technique, modern network and wireless communication technology, distributed information processing etc.Wireless sensor network is made up of a large amount of microsensor nodes that are deployed in the monitored area, sensor node is formed self-organizing network by communication, its objective is the information of perceptive object in cooperation perception, collection and the processing network's coverage area, and send to human observer.If Internet has constituted information world in logic, changed interpersonal communication way, so, wireless sensor network is exactly that the information world of logic and physical world are objectively merged, and changes human and natural interactive mode.People can pass through the direct perception of sensing network objective world, thereby greatly expand the function of existing network and the ability in the human knowledge world.
Sensor network has very wide application prospect, at many key areas such as military and national defense, industrial or agricultural, environmental monitoring, city management, biologic medical, rescue and relief work, anti-probably anti-terrorism, hazardous location remote measurement and controls potential practical value is arranged all, caused the great attention of many national academias and industry member.American commerce weekly and MIT technology review are classified wireless sensor network as 21 century the most influential 21 technology and change one of the 10 big technology in the world respectively in the report of prediction WeiLai Technology development.
Bluetooth is open, the short-distance wireless communication standard cheaply in a kind of whole world, it uses the 2.4GHz frequency range, adopt technology such as fast frequency-hopped, forward error correction and optimization coding, make it have the advantage that antijamming capability is strong, communication quality is stable, simultaneously it also has characteristics such as low-power consumption, low cost, easy to use and electromagnetic pollution be little.These advantages of Bluetooth technology are for its practical application in wireless sensor network provides condition.
3, summary of the invention
The utility model has designed a kind of wireless sensor network node based on bluetooth, and the wireless sensor network of being made up of this node that integrates data acquisition, processing and communication function can be used for local environmental monitoring such as mine, square, sub-district.Sensor network nodes is responsible for gathering, the packet of processing, packed data, other nodes of transfer and packet sent.Therefore, node can serve as the role of data acquisition person, data relay station or host node in network.As data acquisition person, data acquisition module is collected the data (as temperature, humidity etc.) of surrounding environment, directly or indirectly transfers data to base station, a distant place or sink nodes by the communication Routing Protocol; As the data relay station, node also will receive the data of neighbor node except finishing acquisition tasks, is transmitted to it apart from the nearer neighbor node in base station or directly is forwarded to base station or sink nodes; As host node, it is responsible for collecting the data that all nodes are gathered, and after data fusion, sends to base station or sink nodes.
In order to achieve the above object, the technical solution of the utility model is as follows:
The utility model is as a unit that is used for the wireless sensor network of environmental monitoring, and it mainly is made up of sensor assembly, main control module, environmental information memory module, Bluetooth wireless communication module and power module five parts.
Sensor assembly is responsible for finishing the collection of environmental information, is made up of temperature sensor unit, humidity sensor unit, luminance sensor unit three parts.Sensor assembly is connected with main system control module with the AD translation interface by the internal system bus, works under the control of main control module, has also reserved digital and analog interface, the kind of extension sensor easily in addition on the sensor assembly.
Main control module mainly is to finish to the information processing of environmental information (temperature, humidity, brightness) and storage and by the Bluetooth wireless communication module to send to other sensor node, also wants the control of responsible node networking and data Route Selection and system power dissipation etc.The core of main control module is high performance ARM7 processor.
The environmental information memory module mainly is to set up little database on storer, long-term environmental information data is carried out this locality preserve, and offers base station or sink nodes when needed.
The Bluetooth wireless communication module partly is made up of risc processor, FLASH storer, antenna, baseband interface etc., mainly finishes the wireless transmission of data.
Power module is made up of battery, voltage boosting and stabilizing circuit and LDO linear voltage regulating circuit, provides system required multiple voltage.
System combines Bluetooth technology, ARM technology and sensor technology, utilizes ripe ARM7 processor to do the master control chip, designs the wireless sensor network node of high reliability.The information of perceptive object in the overlay area can be gathered and handle to sensor network nodes, and with control center's exchange message, its network has adaptability and viability.System has the following advantages:
One, favorable expandability.System adopts modular design, except that system's fixed sensing module, also leaves general extension sensor assembly interface, can satisfy the demand of vibration, gas alarm, magnetic resistance, multiple information acquisition such as infrared.
Two, reliability height.System uses the ARM7 processor and the integrated sensor module of mature and reliable, stable work in work, and in the Bluetooth protocol that radio communication is used, frequency hopping communications provides safe and reliable being connected with interconnected authentication rules, for wireless networking provides safety guarantee.
Three, networking flexibility.The wireless mode of information has reduced the on-the-spot wiring of monitoring, has avoided the influence of environment to wired connection, as the interference of humidity, vibration and signal.Blue teeth wireless is convenient and fast connection, can set up with cancellation very easily to be connected between wireless sensor network node, and the effective communication distance of adjacent node reaches 10 meters, and by the multiple spot relaying, the networking of collection terminal node and base station distance can reach hundreds of rice.Network topology structure can adapt to following factors and dynamic change: environmental factor or electric energy exhaust and the node failure that causes; Sensor node has movability; The adding of new node.
Four, volume is little, low-cost.Node size is 5cm * 4cm * 2cm, carries the very limited battery supply of energy.The ARM7 processor that system uses and the cost of bluetooth equipment are relatively low, for the extensive use of this node provides advantage.
Five, low-power consumption.ARM7 processor and Bluetooth chip that system uses all have the mode of operation of multiple low-power consumption, and when total system was used the low-power consumption mode work of gathering an environmental information in per 30 minutes, network node was not being changed under the battery situation sustainable work 10 months.
4, description of drawings
Fig. 1 wireless sensor network node structural drawing
Fig. 2 bluetooth module structural drawing
The structural drawing of Fig. 3 root piconet
Fig. 4 networking process structure diagram
The reference topology diagram of Fig. 5 one-level leaf piconet
Fig. 4, the vertical line ellipse is the S/S bridge node in 5, and the oblique line ellipse is a host node, and blank ellipse is from node.
5, embodiment
The wireless sensor network node structural drawing as shown in Figure 1, total system is made up of sensor assembly, main control module, environmental information memory module, Bluetooth wireless communication module and power module five parts.
Sensor assembly is the part of data acquisition of node, mainly is to realize by sensor, thus can determine right sensors according to the actual requirements, as temperature, humidity, vibration, light intensity, gas alarm, magnetic resistance, infrared etc.Native system has designed temperature, humidity and luminance sensor, and leaves the general extension sensor interface.
Temperature Humidity Sensor uses height integrated sensor chip SHT10, the SHT10 sensor comprises a capacitive character condensate humidity sensing element, a temperature-sensing element (device) made from gap material, and on same chip, realize seamless link with 14 A/D converter and serial interface circuit.Each sensor chip is all demarcated in very accurate humidity chamber, counts reference with mirror surface condensing humidity.Calibration factor is stored in the OTP internal memory with program form, uses in the process of proofreading and correct.The serial line interface of two-wire system makes integrated the becoming fast of peripheral system and simple.Small volume, extremely low power consumption make it become the first-selection of types of applications.Product provides surface patch LCC pin package, and it is relatively convenient to weld.The supply voltage of SHT10 adopts 3.3V, and (VDD uses the filter capacitor of a 100nF between GND) to power pins, after sensor powers on, wait for that 11ms finishes " dormancy " state, need not to send any instruction during this period.The serial interface technologies that SHT10 uses adopt two lines two-way (SCK, DATA), and sensor signal read and the loss of power aspect all done optimization process.The communication that SCK is used between microprocessor and the SHT10 is synchronous, and serial data (DATA) is used for reading of data, change state after SCK clock negative edge, and only effective at the SCK rising edge clock.During the data transmission, when SCK clock high level, it is stable that DATA must keep.Finish by starting, these 4 of readback datas are partly formed by transmission time sequence, issue an order, wait measurements for the complete measurement sequential of SHT10.Microcontroller is initiated a communication process with one group of " starting transmission " sequential.It comprises: DA TA upset is low level when SCK clock high level.At DA TA is that SCK becomes low level between low period, and upset is high level again, is that DA TA upset is high level when SCK clock high level subsequently.After " starting transmission " sequential, microcontroller can send order to SHT10.Command byte comprises high 3 address bit and the command bit of hanging down 5.Microcontroller after one group of humidity of issue or temperature survey order, end to be measured such as needs, SHT10 is by dragging down DA TA line finishing of expression measurement.When restarting clock line SCK and reading measurement result, the CRC check of the measurement data of 2 bytes and 1 byte will be transmitted.
Luminance sensor uses the visible light luminance sensor of LX1970 pattern apery eye ligh-induced effect, and it has the photodiode array of a uniqueness, a peak response is arranged and just sharply decay during at ultraviolet and infrared wavelength when 520nm.This photodiode array has very accurately, linear and current conversion function repeatably, and its current sensitivity is 0.38 μ A/1x, and dark current is 10nA.During work, LXT970 receives this visible light and converts current signal to, and from SNK, SRC two pins output current, the resistance by 20K becomes voltage with current conversion, reads magnitude of voltage by AD then, converts thereof into corresponding brightness value.
Main control module uses the LPC2114 processor, resource and performance that it is main have: the crystal oscillator frequency scope is 1-30MHZ in the sheet, can realize being up to the CPU operating frequency of 60MHZ by PLL in the sheet, static RAM (SRAM) in the 16K sheet, 128K in-chip FLASH program storage, High Speed I 2C interface (100kb/s) can be as the expansion of E2PROM, two SPI serial line interfaces, dual uart, wherein UART1 has modem interface completely, and 32 bit timing device/counters of two 32 pre-dividers able to programme have 4 the tunnel respectively and catch/compare passage, the PWM unit of 6 tunnel outputs, 4 10 are approached mould/number conversion one by one, are as short as 2.44 μ s switching time, 46 of universal I/O ports, 4 external interrupt inputs, two low-power consumption modes, idle pulley and power-down mode make contact more energy-conservation when work.The speed of LPC2114 is very fast, and volume is less, and function is stronger, is fit to very much do the primary processor of wireless sensor network node.Use UC/OS II operating system at LPC2114, make sensor information acquisition tasks, network topology updating task, route generation and updating task, data information transfer task dispatching task on a stable workbench, can coordinate to work efficiently.Main control module can be controlled whole node and operate under normal mode and the low-power consumption mode, the normal mode lower node can be gathered an environmental information in per 5/10/30/60 second and transmits according to being provided with, this moment, the amount of information exchange of whole network was big, and the power consumption of system is higher; When node operates in low-power consumption mode following time, node was just gathered an environmental information in per 30 minutes and is transmitted, and this moment, system's average power consumption was very low.
The Bluetooth wireless communication module is used single-chip blue tooth products BlueCore02, and inner structure as shown in Figure 2.It integrates wireless device, microprocessor and additional circuits thereof, adopts the CMOS technology of 0.35 μ m of standard, so power consumption is very low.BlueCore02 can provide the data and the voice communication of complete compatibility by the FlashROM that has Bluetooth protocol of periphery, and through optimal design, required external RF element seldom allows the quick design of mainboard.
Its principal feature is as follows:
1) meets Bluetooth V1.1 standard;
2) have USB and UART main interface, convenience is communicated by letter and later function expansion with host computer;
3) programmable pcm interface, the simultaneous voice of support 13-Bit bidirectional linked list;
4) digital quantizer that includes, can carry out the mutual conversion between linear PCM (pulse code modulation (PCM)), A rule PCM, μ rule PCM and CBSD (changing the slope delta modulation continuously), volume is separated and is met high Bluetooth control agreement to the HCI layer, for the diversification purposes of sensor network provides the foundation;
5) adopt the 3.3V single power supply, support PART, SNIFF, many kinds of energy-saving modes of HOLD; Support all bag types and the piconet (Piconet) that reaches 7 slave units;
6) chip includes multilevel software protocol stacks such as controlling links, link management, HCI and optional L2CAP, RFCOMM, SDP, can directly use;
7) provide VM (Virtual Machine) mechanism, embedded 16 risc microcontroller can also move the user program that downloads among the Flash ROM in the time of the operation protocol stack, realizes single-chip truly, thereby has reduced cost.
The Bluetooth wireless communication module is connected with main control chip by the UART interface, and the LPC2114 system controls bluetooth module at the HCI layer, finishes establishment of connection between bluetooth module, the transmission of data etc.
That the environmental information memory module is selected for use in system is the E with 4K capacity 2Rom chip CAT24WC04, its A0, A1, the A2 pin is an address selection, is direct ground connection herein.WP is write-protect; when the WP pin is connected to VCC; all contents are all by write-protect; when the WP pin is connected to GND or when unsettled; allow device to carry out normal read/write operation; directly with its ground connection, SCL serial clock input pin is used to produce the clock that all data of device send or receive herein.SDA serial data and pin is used for the transmission or the reception of all data of device, because SDA and SCL export for opening Lou, draws resistance so will connect SCL and SDA.
Power module is made up of battery, voltage boosting and stabilizing circuit and LDO linear voltage regulating circuit.System need use the dual power supply of 3.3V and 1.8V, consider the mobility of node, use the AA powered battery of a joint 1.5V, use MAX1678 to finish the voltage stabilizing conversion of boosting of voltage simultaneously, finish the conversion of voltage from 1.5V to 3.3V, use LDO linear voltage regulator REG1117 to finish the conversion of 3.3V then to 1.8V.MAX1678 booster type voltage stabilizer conversion efficiency is very high, and size is less, also comprise in this chip one independently comparer can be used for battery low-voltage and detect.MAX1678 adopt permanent peak point current control principle to make it have low quiescent current and also under full load efficient can reach 90%, have extremely low output voltage ripple, still can guarantee when operating voltage can be low to moderate 0.7V to start.High Output Current was 45mA when 1.2V voltage was risen to 3.3V.The BATT pin of MAX1678 is the input end of battery supply, and PFI is the power down input, when the voltage at PFI place is lower than 614mV, PFO suppresses electric current, and PFO is for opening the electricity output of pouring off, when the voltage at PFI place is lower than 614mV, PFO suppresses electric current, SHDN low pressure activator switch often is connected with BATT, and FB is a double-mode, the feedback input, GND is ground, and LX is the drain electrode exit of N-channel MOS FET fet switch and the drain electrode exit of P raceway groove synchronous rectification, and OUT is the output of 3.3V power supply.
When node was in the long-term work state, electric weight can reduce gradually, and the information about power of grasping system has significance to wireless sensor network, and system has adopted simple voltage detection method.At first utilize resistor network that the voltage of battery is carried out dividing potential drop, then the voltage that collects is sent on the master chip, carry out analog to digital conversion, obtain the correspondent voltage value, for the Route Selection of node and the selection of bridge contact provide reference information.
Sensor network nodes adopts based on the network diffusion method of root node forms network, execution environment monitoring task after the networking.
At first be the formation of root piconet, the open state root node enters query State, and this moment, the query manipulation maximum promised that number of times is 1, promptly can only inquire a bluetooth equipment at most at every turn.Other nodes except that root node all enter inquiry scan state, and allow call.Root node at first enters query State, if the device responds inquiry is arranged, then is connected with this equipment; If there is not device responds inquiry, then repeat query manipulation, so repeatedly, in the number of devices that connects reaches 7 or time of setting, can not inquire other legitimate device again till.So far the root piconet that with the root node is master unit has been set up, and can be connected to 7 slave units under the ideal state, as shown in Figure 3.
After the root piconet is set up, root node radio network expansion order, network-end node all can respond this order, and network-end node all enters query State, if the device responds inquiry is arranged, then is connected with this equipment; Can not inquire other equipment if in setting-up time, there is the device responds inquiry to think, stop query manipulation and report query timeout to root node.After connection is finished, the work that main equipment will be done: cancel from identity as network-end node; Mark is certainly as the M/S bridge role; The mark slave unit is the slave unit role; Preservation is from the BD_ADDR of node; Append ID numbering and the preservation that obtains for 0 from node in the ID numerical digit back of self; Send a packet to slave unit, packet should comprise host node ID numbering, role, number from node ID.The work that slave unit will be done: forbid inquiry scan and call out scanning, promptly do not respond inquiry and calling; Mark is from as from the node role; And mark is certainly as network-end node; The ID numbering that preserve host node BD_ADDR and ID numbering, role, self is assigned to; Packet of loopback is used for authentication after receiving packet.After authentication finishes, main equipment is initiated master-slave equipment role's conversion, if change successfully, original main equipment has become slave unit, this moment, it wanted mark certainly as S/S bridge device role, notice root node and its Role Information record of apparatus modifications (perhaps registration) that is connected with it, and the notice root node has been finished the work of this stage.So far first order leaf piconet has been determined main equipment, and under the ideal state, network topology as shown in Figure 4.Numeral ID on the node, the original network-end node of this link connects with a new host node, thereby becomes bridge node (S/S), and new host node becomes network-end node, it will continue the expansion network in the next stage.
Root node is radio network expansion order once more, and each piconet all can be transmitted this grouping.The role proceeds the network expansion for the network-end node of main equipment, and network-end node all enters query State, if the device responds inquiry is arranged, then is connected with this equipment; Can not inquire other equipment if in setting-up time, there is the device responds inquiry to think, stop query manipulation, and to root node report query timeout.So repeatedly, reach 7 (comprising the bridge node that the last stage has connected) or query timeout up to the slave unit number that connects.5.0 process inquiries only search 3 nodes and connect with them as node, and these 3 nodes change 5.1,5.2,5.3 into oneself ID number successively.Comprise 5 nodes by node 5.0 altogether as the bluetooth piconet network of host node this moment, is respectively host node 5.0, bridge node 5, network-end node 5.1,5.2,5.3.So far, host node will send packet to root node and be used to report that this stage finishes, and packet should comprise the slave unit information that this stage is connected to.One-level leaf piconet has been set up like this, and Fig. 5 has provided the reference topology diagram of network development to one-level leaf piconet.
When the all-network endpoint node all reports that to root node this stage finishes or query timeout, root node is radio network expansion order once more.So repeatedly, by root node repeatedly the command net endpoint node carry out network expansion, till double network expansion is not all found new node.So far, can think that the networking process finishes.

Claims (5)

1, a kind of wireless sensor network node based on bluetooth, comprise sensor assembly, main control module, environmental information memory module, Bluetooth wireless communication module, power module, it is characterized in that: sensor assembly comprises temperature sensor unit, humidity sensor unit, three fixed parts in luminance sensor unit and digital-to-analog sensor expansion interface.
2, wireless sensor network node according to claim 1, it is characterized in that: main control module adopts AMR7 processor chips LPC2114, and sensor information acquisition tasks, network topology updating task, data information transfer task dispatching task run are on UC/OS II operating system.
3, wireless sensor network node according to claim 1 is characterized in that: the environmental information memory module is arranged on the node, long-term environmental information data are carried out this locality preserve, can disposablely be transferred to the base station when needing in the base station.
4, wireless sensor network node according to claim 1 is characterized in that: the information transmission of node adopts Bluetooth technology, utilizes the bluetooth connected mode to set up required piconet of wireless sensor network and scatternet.
5, wireless sensor network node according to claim 1 is characterized in that: node adopts the AA powered battery, the multiple voltage that cooperates voltage boosting and stabilizing circuit and LDO linear voltage regulating circuit to provide node to need.
CN 200720081863 2007-10-31 2007-10-31 Wireless sensor network node based on Bluetooth Expired - Fee Related CN201262702Y (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101917207A (en) * 2010-08-19 2010-12-15 西北工业大学 Sensing node circuit adapting to various sensors
CN102055499A (en) * 2009-10-27 2011-05-11 西安迅腾科技有限责任公司 Wireless sensor network node module based on Bluetooth
CN102122162A (en) * 2010-12-30 2011-07-13 北京四方继保自动化股份有限公司 Microgrid central controller
CN102684917A (en) * 2012-04-26 2012-09-19 华为技术有限公司 Method, device and system for backuping data
CN103975288A (en) * 2011-12-21 2014-08-06 英特尔公司 Methods and systems for energy efficiency and energy conservation including entry and exit latency reduction for low power states
CN104469660A (en) * 2014-11-20 2015-03-25 青岛歌尔声学科技有限公司 Bluetooth-based networking method
CN104748786A (en) * 2013-12-30 2015-07-01 南京理工大学常熟研究院有限公司 Ad Hoc network-based livestock farm environment monitoring system
CN104809859A (en) * 2015-04-29 2015-07-29 无锡市崇安区科技创业服务中心 Temperature and humidity sensor system based on BLE (Bluetooth Low Energy)
CN106556880A (en) * 2016-11-23 2017-04-05 苏州大学 A kind of weather monitoring sensor node based on ZigBee
CN106851536A (en) * 2017-01-13 2017-06-13 辽宁石油化工大学 A kind of method that characteristics of human body and environmental data are delivered to ground by down-hole miner using mobile device
CN110855538A (en) * 2019-11-13 2020-02-28 深圳市搜电科技发展有限公司 Slave address identification method based on bus communication system, bus communication system and charger leasing system

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102055499A (en) * 2009-10-27 2011-05-11 西安迅腾科技有限责任公司 Wireless sensor network node module based on Bluetooth
CN101917207A (en) * 2010-08-19 2010-12-15 西北工业大学 Sensing node circuit adapting to various sensors
CN102122162B (en) * 2010-12-30 2012-06-27 北京四方继保自动化股份有限公司 Microgrid central controller
CN102122162A (en) * 2010-12-30 2011-07-13 北京四方继保自动化股份有限公司 Microgrid central controller
CN103975288B (en) * 2011-12-21 2017-03-29 英特尔公司 Entrance including low power state and exit waiting time reduction efficiency and energy-conservation method and system
CN103975288A (en) * 2011-12-21 2014-08-06 英特尔公司 Methods and systems for energy efficiency and energy conservation including entry and exit latency reduction for low power states
CN102684917A (en) * 2012-04-26 2012-09-19 华为技术有限公司 Method, device and system for backuping data
CN102684917B (en) * 2012-04-26 2016-09-07 华为技术有限公司 A kind of data back up method, Apparatus and system
CN104748786A (en) * 2013-12-30 2015-07-01 南京理工大学常熟研究院有限公司 Ad Hoc network-based livestock farm environment monitoring system
CN104469660A (en) * 2014-11-20 2015-03-25 青岛歌尔声学科技有限公司 Bluetooth-based networking method
CN104809859A (en) * 2015-04-29 2015-07-29 无锡市崇安区科技创业服务中心 Temperature and humidity sensor system based on BLE (Bluetooth Low Energy)
CN106556880A (en) * 2016-11-23 2017-04-05 苏州大学 A kind of weather monitoring sensor node based on ZigBee
CN106556880B (en) * 2016-11-23 2019-12-27 苏州大学 Meteorological monitoring sensor node based on zigBee
CN106851536A (en) * 2017-01-13 2017-06-13 辽宁石油化工大学 A kind of method that characteristics of human body and environmental data are delivered to ground by down-hole miner using mobile device
CN110855538A (en) * 2019-11-13 2020-02-28 深圳市搜电科技发展有限公司 Slave address identification method based on bus communication system, bus communication system and charger leasing system
CN110855538B (en) * 2019-11-13 2022-04-15 深圳竹芒科技有限公司 Slave address identification method, bus communication system and charger leasing system

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