CN203299198U - Soil environment monitoring data collection terminal based on SDI-12 bus - Google Patents
Soil environment monitoring data collection terminal based on SDI-12 bus Download PDFInfo
- Publication number
- CN203299198U CN203299198U CN2013203756632U CN201320375663U CN203299198U CN 203299198 U CN203299198 U CN 203299198U CN 2013203756632 U CN2013203756632 U CN 2013203756632U CN 201320375663 U CN201320375663 U CN 201320375663U CN 203299198 U CN203299198 U CN 203299198U
- Authority
- CN
- China
- Prior art keywords
- sdi
- bus
- sensor
- data collection
- environment monitoring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model provides a soil environment monitoring data collection terminal based on an SDI-12 bus. The soil environment monitoring data collection terminal comprises the SDI-12 bus and a power module. The SDI-12 bus is respectively connected with a CC2530 control core, a SDI-12 bus interface circuit and a Stevens Hydra Probe II sensor; and the power module is respectively connected with the CC2530 control core, the SDI-12 bus interface circuit and the Stevens Hydra Probe II sensor. The soil environment monitoring data collection terminal can perform high-precision multi-angle monitoring on the soil environment and collect relevant parameters, the soil environment monitoring data collection terminal based on the SDI-12 bus has a united interface standard protocol in data collection, communication contents are stipulated, the sensor can share a power supply with a data recorder on various complex environment monitoring application occasions, and the requirements of a filter circuit are effectively met.
Description
Technical field
The utility model belongs to the soil environment monitoring technical field, relates to a kind of high-precision intelligent sensor, is specifically related to a kind of data collection station of soil environment monitoring based on the SDI-12 bus.
Background technology
Along with the develop rapidly of electronic technology, sensor technology and computer technology, the intelligence instrument that is used for the hydrology, meteorology and environmental monitoring emerges in multitude, and gos deep into gradually each corner in environmental hydrology monitoring field with the intelligence sensor terminal of SDI-12 communication standard.But wiring is difficult, power consumption is high, in the field environment of complexity, monitor, transmission is difficult, the image data precision is low is the serious problems that intelligent terminal exists.
Summary of the invention
The purpose of this utility model is to provide a kind of data collection station of soil environment monitoring based on the SDI-12 bus, have high precision, multi-angle, self-organization, low-power consumption function, and can for open-air measuring multiple parameters storage problem provide the suitable external bus of a kind of low-power consumption, easily expansion, price by way of.
For achieving the above object, the technical scheme that the utility model adopts is: a kind of data collection station of soil environment monitoring based on the SDI-12 bus comprises SDI-12 bus and power module; The SDI-12 bus is connected with CC2530 control core, SDI-12 bus interface circuit and Stevens Hydra Probe II sensor respectively; Power module is connected with CC2530 control core, SDI-12 bus interface circuit and Stevens Hydra Probe II sensor respectively.
the utility model data collection station adopts the control core of CC2530 chip to realize the function of wirelessly transmitting data, terminal self-organization, low-power consumption, adopt Stevens Hydra Probe II sensor to provide moisture for monitored area, conductivity and temperature data, it also provides primary voltage and complicated specific inductive capacity simultaneously, thereby soil environment is carried out multi-angle monitor and gather correlation parameter, solved high precision, the soil environment monitoring problem of multi-angle, and the soil environment monitoring data collection station data acquisition of SDI-12 bus has unified interface standard agreement, and stipulated Content of Communication, meet many complex environment monitoring and measuring application occasions and wish that sensor can share power supply with data recorder, the requirement of protection and filtering circuit effectively.
Description of drawings
Fig. 1 is the structural representation of the utility model data collection station.
Fig. 2 is the connection diagram that in the utility model data collection station, sensor passes through SDI-12 bus and CC2530 control core.
Fig. 3 is the peripheral circuit diagram of Stevens Hydra Probe II sensor in the utility model data collection station.
Fig. 4 is SDI-12 bus timing figure in the utility model data collection station.
Fig. 5 is Stevens Hydra Probe II soil sensor data acquisition flow figure in the utility model data collection station.
Fig. 6 is in sensor image data process, the signal response figure on the SDI-12 data line.
Fig. 7 is each frame data format figure in the SDI-12 bus communication.
In Fig. 1: 1.CC2530 control core, 2.AES encrypting and decrypting module, 3. power module, 4.Stevens Hydra Probe II sensor, 5. the second sensor, 6. first sensor, 7.SDI-12 bus, 8.SDI-12 bus interface circuit, 9.I/O input/output port, 10. A/D modular converter, 11.CPU core, 12. memory module, 13. external crystal oscillation circuit, 14. radio receiving transmitting modules.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, the utility model data collection station, comprise SDI-12 bus 7 and power module 3; SDI-12 bus 7 is connected with CC2530 control core 1, SDI-12 bus interface circuit 8 and Stevens Hydra Probe II sensor 4 respectively; Power module 3 is connected with CC2530 control core 1, SDI-12 bus interface circuit 8 and Stevens Hydra Probe II sensor 4 respectively.
CC2530 control core 1(also referred to as: data acquisition unit) comprise core cpu 11, core cpu 11 adopts the 8051MCU kernel, and core cpu 11 is connected with AES encrypting and decrypting module 2, I/O input/output port 9, A/D modular converter 10, memory module 12, external crystal oscillation circuit 13 and radio receiving transmitting module 14 respectively; I/O input/output port 9 is connected with SDI-12 bus 7.
Stevens Hydra Probe II sensor 4 comprises a first sensor 6 and a plurality of the second sensor 5; All sensors all are connected with SDI-12 bus 7.
The utility model data collection station, take SDI-12 bus 7 as medium, makes between CC2530 control core 1 and Stevens Hydra Probe II sensor 4 and carries out data communication; Under the SDI-12 agreement is supported,, as long as by a triple cable, can connect composition soil environment monitoring data collection station to a number of units according to collector and a plurality of soil sensor, as shown in Figure 2.
As shown in Figure 3, in the utility model data collection station, the peripheral circuit of Stevens Hydra Probe II sensor, comprise the voltage transitions chip, and this voltage transitions chip is LM2940.
The 12V voltage input end of voltage transitions chip is connected with the negative pole of diode D3 with an end of the first capacitor C 1, the negative pole of the first voltage stabilizing diode D1 respectively, and the positive pole of diode D3 connects the 12V power lead; The plus earth of the other end of the first capacitor C 1 and the first voltage stabilizing diode D1; The data line of SDI-12 bus 7 is connected with an end of the second resistance R 2 with the positive pole of spark discharger S1 respectively, the other end of the second resistance is connected with an end of the second capacitor C 2, an end of the 3rd resistance R 3, the negative pole of the second voltage stabilizing diode D2 and an end of the first resistance R 1 respectively, the data line of another termination sensor component of the first resistance R 1; The negative pole of the other end of the other end of the positive pole of the second voltage stabilizing diode D2, the 3rd resistance R 3, the second capacitor C 2 and spark discharger S1 is ground connection respectively, and this peripheral circuit plays protection and filter action.
The high-performance of CC2530 control core device 1 makes it to possess has stronger data holding ability under various patterns, and support hardware debugging, high sensitivity and interference free performance are arranged, support the multiple network topological structure, and observe worldwide radio frequency supervising regulation.The switching of CC2530 control core 1 plurality of operating modes has guaranteed that operational system has the performance of super low-power consumption, can change rapidly between different operational modes, has more guaranteed the characteristics of its low power consumption, has realized the function of MANET and low-power consumption.
Stevens Hydra Probe II sensor 4 can be studied application for soil environment provides the data such as moisture, conductivity and humiture, and it also provides primary voltage and complicated specific inductive capacity simultaneously.Sensor probe is different from common capacitance probe, and it is with high-frequency Measuring Dielectric Constant and conductivity, thereby calculates humidity and the salinity of soil, uses simultaneously the thermosensitive resistance measurement soil moisture, has stronger instantaneity.Specific inductive capacity is closely related with moisture, conductivity is closely related with soil salt, two parameters of specific inductive capacity and conductivity accurate electrical specification of reflect soil just, make Stevens Hydra Probe II soil moisture probe have unique advantage at soil environment monitoring like this.
The Sensor section of SDI-12 bus standard has mainly comprised supports the sensor of SDI-12 bus to apply in soil environment monitoring with different forms, soil environment is detected with two kinds of different forms as Stevens Hydra Probe II sensor 4, namely by 6 pairs of soil surface environment of first sensor, detect, by 5 pairs of soil different depths of a plurality of the second sensors, detect.
The function of the utility model data collection station:
1. the measurement function of 4 pairs of soil environments of Stevens Hydra Probe II sensor
Stevens Hydra Probe II sensor 4 has solely thick advantage than other soil sensor, high precision is to moisture, conductivity and temperature survey simultaneously, can be for the research application provides the data such as moisture, conductivity and temperature, it also provides primary voltage and complicated specific inductive capacity simultaneously.Stevens Hydra Probe II sensor 4 provides the data of science to soil management.This sensor adopts soil three parameter composite sensor technology, has high-performance, original position high-acruracy survey moisture, conductivity and temperature data simultaneously, have strong adaptability, anticorrosive, waterproof and dampproof, be widely used, the characteristics such as portable measurement.The technical indicator of sensor comprises: 1) measurement parameter, volumetric water content of soil, conductivity, temperature; 2) measuring unit, the vol% of volumetric water content of soil unit (m3/m3), the S/m of conductivity unit, temperature unit degree centigrade; 3) measurement range, volumetric water content of soil 0～100%, conductivity 0.01～15, temperature-10～+ 55; 4) measuring accuracy, in the unsaturation scope volumetric water content of soil be ± 2%, unsaturation scope internal conductance rate ± 8%, the interior temperature of unsaturation scope ± 0.1; 5) working current, during measurement: 30mA; Between rest period:＜10mA; 6) supply voltage 9～20VDC; 7) electrode material, stainless steel.
2. form self-organization, dynamic topological network function
The realization of self-organization, dynamic topological network function comes from CC2530 control core 1.CC2530 is real SOC (system on a chip) (SoC) solution that is used for 2.4GHz, IEEE 802.15.4, ZigBee and RF4CE application, generally can form star network, mesh network and 3 kinds of topological structures of clustered network.The utility model data collection station can become in the ZigBee-network technology any with network role in network coordinator, network router and network-termination device by software programming, terminal can freely enter and withdraw from this network with network router and network-termination device role when having ZigBee-network, when there is no ZigBee-network, terminal can be served as the role of network coordinator, and tissue forms and manage the ZigBee-network that generates.consider in the design process of terminal in the data collection station use procedure of SDI-12 bus, the part terminal changes because changes in environmental conditions may cause the wireless communication link bandwidth, even interrupt, or terminal depleted of energy, some new terminals are also arranged in order to make up failure node, increase the monitoring precision and make up the medium a series of situations of network, make terminal have self-organization, the function of dynamic topological network, can automatically be configured and manage, automatically form the multi-hop wireless network system that forwards Monitoring Data by Topology Control Mechanisms and procotol.
3. low-power consumption function
1 minute different period image data of CC2530 control core.When data collection station during the period,, by arouse machine processed, wakes sensor up to collection, allow sensor carry out acquisition tasks, enter the image data pattern; Remaining timer is in the rest period, enters park mode.It is to be decided by powered operation patterns different in the CC2530 chip that the state of rest mode and image data pattern is distinguished.Various powered operation patterns are called as aggressive mode PM1, idle pulley PM2 and power mode 2PM3.Avoid static (leakages) electrical source consumption to realize the super low-power consumption operation by closing to the power supply of module, also can be by with gated clock with close oscillator reduction dynamic power consumption and realize that super low-power consumption moves.
4. Wireless Data Transmission and security functions
CC2530 has an IEEE 802.15.4 standard radio transceiver.RF core control simulation wireless module.The wireless receiver of CC2530 is the receiver of a medium and low frequency.The radiofrequency signal that receives is amplified by low noise amplifier and the quadrature frequency reducing is transformed into intermediate frequency.In intermediate frequency, when analog to digital conversion, input quadrature phase-modulated signal is filtered and amplifies.The radio transmitters of CC2530 is based on upconverter.Receive deposit data in a data buffer that receives first in first out, by analog to digital conversion, change and digital signal is changed into simulating signal send.The data buffer of CC2530 receives 128 bit data by the mode of first in first out,, by the special function register interface, uses equally the mode reading out data of first in first out, and internal memory and buffer data move with dma mode and realize.In addition, it for MCU and wireless between an interface is provided so that can send order, reading state, automatic operation and wireless event is sorted.Wireless portion also comprises a data packet filtering and Address Recognition module.
CC2530 has adopted the AES-128 superencipherment in data transmission, also referred to as the Rijndael algorithm, the fast level of security of its enciphering rate is high.
5. SDI-12 protocol data transfer function
Between CC2530 control core 1 and Stevens Hydra Probe II sensor 4 by SDI-12 bus 7 the transmission of datas.SDI-12 is a kind of serial digital formula interface, and by the communication between its data acquisition device and various serial mathematical expression sensor, communication speed is 1200 bauds, and for sensor provides rated voltage, is the power supply of 12 volts.Three lines are arranged on sensor device, and data line is the transmission mode of two-way three-state, and what the SDI-12 bus of Stevens Hydra Probe II sensor 4 adopted is the negative logic level.The speed of voltage transitions is less than or equals 1.5V/us in the process of normal operation.The sensor ground wire must be connected with the ground wire of CC2530 controller part and make it common ground.Sensor on SDI-12 bus 7 need provide 9.6V～16V power supply to guarantee the normal operation of sensor.
The exchange of information is to realize with the form of ASCll code between SDI-12 bus 7 upper sensors and collector.As shown in Figure 4 in sequential, the wake-up signal that data acquisition unit sends a 12ms wakes the sensor that connects on bus up, send order then for the sensor that will communicate by letter, only have the sensor of corresponding ID to respond and make and replying, on bus, other sensor is all ignored this order, and is in dormant state, and last collector sends the order of conversion and image data, respective sensor starts conversion and send data on bus, until data are sent completely.Sensor image data process flow diagram as shown in Figure 5, adopts three timers to realize communication protocol in the utility model.Wherein first timer is mainly used in receiving and sending each binary data bit.According to baud rate 1200 requirements, the timing of each is 833 μ s.Second timer is mainly used in limiting the time of each retry, if at the 112.5ms inner sensor, do not respond, communication failure is described, will discharge bus.The 3rd timer is used for judging whether dormancy of sensor.Each communication process uses inside and outside two-layer circulation each three times., if communicate by letter successfully, return to " 1 " and return measurement result; Otherwise, return to " 0 " communication failure be described.Because SDI-12 bus 7 is unibus, acquisition terminal carries out read operation when each binary data that read sensor sends is stable be the successful key of communication.When each binary signal is regularly read, increase by the time delay of 300 μ s in the utility model, solved this problem.Because the bus duration of each binary digit is 833 μ s, when the timing of 833 μ s has arrived, just be the bus time of next bit data bit, data bus was in transitional states and was unfavorable for reading out data this moment, but increase by 300 μ s time delays and can guarantee that data are in the bus steady state (SS), time delay and timer are concurrent workings in addition, so time delay can not affect reading of more data bit.
1) the CC2530 primary controller is three parts: a, wake-up signal (break) to the content that sends order on bus, and signal (marking) is found in b, address, c, sends order data.
At first, finish the initialization of CC2530 processor and sensor, and produce wake-up signal (break), continue the spacing wave of 12ms (space) at least, present high level state on SDI-12 bus 7; Then be that signal (marking) is found in the address that continues 8.33ms(permissible error-0.4ms), present low level state on SDI-12 bus 7, and determine corresponding sensor, after the time delay of 8.33ms, send finally on SDI-12 bus 7 with by the data bit transmission command "?! " data, "? " order converts binary code to for " 00111111 " and " 00100001 "; 7 corresponding radix-minus-one complements are " 1000000 " and " 1011110 "; the data that should transmit take position on data line are " 0110000001 " and " 0110111101 ", so whole the transmission of data is " 10000001101011110110 ".Then wait for that sensor makes response, enter waiting process.
2) corresponding sensor must be made and replying in 15ms, the number of the maximum time that the return measurement data are required and the data that will return.
3) the CC2530 primary controller receives the process of data: monitoring sensor is replied, and returns to one or more measurement results.Detect the high level on the SID-12 bus, be address and find signal (marking), ensuing is data-signal, obtain with the position transmission, as shown in Figure 6, the data that should transmit on the data that receiving sensor responds and SDI-12 bus are " C＜CR〉＜LR〉", and being converted into scale-of-two is " 10011110001010011100
1101011110”。(CR/LR-carriage return/line feed)
4), if the time exceeds maximum response time, withdraw from waiting process, expression is without response, and gatherer process finishes.
As shown in Figure 7, the communication data form of SDI-12 bus is 1 start bit, 7 bit data positions, 1 position of rest of 1 digit pair check bit sum to data frame format in data acquisition.Wherein, start bit is high level, position of rest position low level.In addition because this bus is negative logic, so need to carry out sending again after the radix-minus-one complement operation to 7 bit data.Equally, the sensor response data is also negative logic after data acquisition unit sends order, and the acquisition of True Data need to be carried out complementary operation to each of 7 bit data positions of reception and realize.After data acquisition unit or sensor release bus, bus is low level.
The notebook data acquisition terminal has adopted the SDI-12 bus, has unified interface standard agreement, can make collector and sensor share power supply, can gather the soil environment data such as the soil moisture, humidity, specific inductive capacity, have the functions such as data that the wireless receiving and dispatching of topological structure, the low-power consumption of self-organization, multi-hop gathers; The data that collect can adopt Wireless Data Transmission, actual time safety is transferred to monitoring center, generating report forms, statistical study, be convenient to the follow-up study personnel situation that monitors soil promptly and accurately, thereby more comprehensive, scientifical, as to reflect really monitored soil situation of change, the soil information of provide effective mitigation drought resisting, taking precautions against drought.Meet many complex environment monitoring and measuring application occasions and wish that sensor can share power supply with data recorder, the requirement of protection and filtering circuit effectively.
Claims (5)
1. the data collection station of the soil environment monitoring based on the SDI-12 bus, is characterized in that, comprises SDI-12 bus (7) and power module (3); SDI-12 bus (7) is connected with CC2530 control core (1), SDI-12 bus interface circuit (8) and Stevens Hydra Probe II sensor (4) respectively; Power module (3) is connected with CC2530 control core (1), SDI-12 bus interface circuit (8) and Stevens Hydra Probe II sensor (4) respectively.
2. according to claim 1 based on the soil environment monitoring data collection station of SDI-12 bus, it is characterized in that, described CC2530 control core (1) comprises core cpu (11), and core cpu (11) is connected with AES encrypting and decrypting module (2), I/O input/output port (9), A/D modular converter (10), memory module (12), external crystal oscillation circuit (13) and radio receiving transmitting module (14) respectively; I/O input/output port (9) is connected with SDI-12 bus (7).
3., according to claim 2 based on the soil environment monitoring data collection station of SDI-12 bus, it is characterized in that, described core cpu (11) adopts the 8051MCU kernel.
4. according to claim 1 based on the soil environment monitoring data collection station of SDI-12 bus, it is characterized in that, this data collection station also comprises the peripheral circuit of Stevens Hydra Probe II sensor (4), this peripheral circuit comprises the voltage transitions chip, the 12V voltage input end of voltage transitions chip is connected with the negative pole of diode (D3) with an end of the first electric capacity (C1), the negative pole of the first voltage stabilizing diode (D1) respectively, and the positive pole of diode (D3) connects the 12V power lead; The plus earth of the other end of the first electric capacity (C1) and the first voltage stabilizing diode (D1); The data line of SDI-12 bus (7) is connected with an end of the second resistance (R2) with the positive pole of spark discharger (S1) respectively, the other end of the second resistance (R2) is connected with an end of the second electric capacity (C2), an end of the 3rd resistance (R3), the negative pole of the second voltage stabilizing diode (D2) and an end of the first resistance (R1) respectively, the data line of another termination sensor component of the first resistance (R1); The negative pole of the other end of the other end of the positive pole of the second voltage stabilizing diode (D2), the 3rd resistance (R3), the second electric capacity (C2) and spark discharger (S1) is ground connection respectively.
5., according to claim 4 based on the soil environment monitoring data collection station of SDI-12 bus, it is characterized in that, described voltage transitions chip is LM2940.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203756632U CN203299198U (en) | 2013-06-27 | 2013-06-27 | Soil environment monitoring data collection terminal based on SDI-12 bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203756632U CN203299198U (en) | 2013-06-27 | 2013-06-27 | Soil environment monitoring data collection terminal based on SDI-12 bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203299198U true CN203299198U (en) | 2013-11-20 |
Family
ID=49575203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203756632U Expired - Fee Related CN203299198U (en) | 2013-06-27 | 2013-06-27 | Soil environment monitoring data collection terminal based on SDI-12 bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203299198U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837582A (en) * | 2014-03-14 | 2014-06-04 | 西北大学 | Micro-damage rammed earth salt measurement front-end structure for earthen archaeological site protection |
| CN104318735A (en) * | 2014-09-23 | 2015-01-28 | 广东工业大学 | Low power consumption wireless sensing network apparatus for logistic vehicle condition monitoring |
| CN104865315A (en) * | 2015-06-01 | 2015-08-26 | 北京新联铁科技股份有限公司 | Encryption method for hollow axle ultrasonic wave flaw detecting system |
| CN105807735A (en) * | 2014-12-31 | 2016-07-27 | 比亚迪股份有限公司 | Charging station system and control method thereof |
| CN111448976A (en) * | 2020-06-04 | 2020-07-28 | 宁夏大学 | NB-IOT (NB-IOT) -based irrigation pulse electromagnetic valve remote control device, system and method |
| CN111654834A (en) * | 2020-06-04 | 2020-09-11 | 宁夏大学 | NB-IoT-based SDI12 sensor data wireless acquisition device, system and method |
| CN111756774A (en) * | 2020-07-28 | 2020-10-09 | 中国科学院西北生态环境资源研究院 | Monitoring device and connection method |
-
2013
- 2013-06-27 CN CN2013203756632U patent/CN203299198U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837582A (en) * | 2014-03-14 | 2014-06-04 | 西北大学 | Micro-damage rammed earth salt measurement front-end structure for earthen archaeological site protection |
| CN104318735A (en) * | 2014-09-23 | 2015-01-28 | 广东工业大学 | Low power consumption wireless sensing network apparatus for logistic vehicle condition monitoring |
| CN104318735B (en) * | 2014-09-23 | 2018-11-16 | 广东工业大学 | A kind of low-consumption wireless sensing network device of logistics vehicles status monitoring |
| CN105807735A (en) * | 2014-12-31 | 2016-07-27 | 比亚迪股份有限公司 | Charging station system and control method thereof |
| CN104865315A (en) * | 2015-06-01 | 2015-08-26 | 北京新联铁科技股份有限公司 | Encryption method for hollow axle ultrasonic wave flaw detecting system |
| CN111448976A (en) * | 2020-06-04 | 2020-07-28 | 宁夏大学 | NB-IOT (NB-IOT) -based irrigation pulse electromagnetic valve remote control device, system and method |
| CN111654834A (en) * | 2020-06-04 | 2020-09-11 | 宁夏大学 | NB-IoT-based SDI12 sensor data wireless acquisition device, system and method |
| CN111654834B (en) * | 2020-06-04 | 2024-02-09 | 宁夏大学 | Wireless acquisition device and method for SDI12 sensor data based on NB-IoT |
| CN111756774A (en) * | 2020-07-28 | 2020-10-09 | 中国科学院西北生态环境资源研究院 | Monitoring device and connection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203299198U (en) | Soil environment monitoring data collection terminal based on SDI-12 bus | |
| CN103369719B (en) | Based on the wireless humiture sensor network structure of zigbee | |
| CN202841542U (en) | Data acquisition transmission terminal of water conservancy Internet of things | |
| CN104333891A (en) | Low-power WiFi communication chip based on passive awakening and method thereof | |
| Zhang et al. | A kind of design schema of wireless smart water meter reading system based on zigbee technology | |
| CN101784132A (en) | Wireless sensor network gateway equipment supporting Zigbee protocol and GPRS communication standard | |
| CN103940470A (en) | Wireless low power consumption detection system for workshop environment based on Zigbee | |
| CN103077594A (en) | ZigBee-based wind power plant wireless data acquisition system | |
| CN202738118U (en) | Wireless humiture sensor network structure based on ZigBee | |
| CN204666186U (en) | Based on the storage environment monitoring system of wireless network | |
| CN103246223A (en) | Zigbee-based sensing measurement and control system | |
| Liang et al. | Design and implementation of an ultra-low power wireless sensor network for indoor environment monitoring | |
| CN203325177U (en) | Meter reading system based on low-power-consumption wireless technology | |
| CN208383332U (en) | A kind of ship base low-power consumption measurement system for sea water temperature based on LoRa | |
| CN203325188U (en) | Wireless temperature and humidity acquisition terminal with ultra-low power consumption | |
| CN206364820U (en) | Communication system based on cellular arrowband Internet of Things | |
| CN113259885A (en) | Monitoring data acquisition control system based on Internet of things | |
| Li et al. | Design on environment monitoring system for greenhouse based on wireless sensor network | |
| CN103150882A (en) | Power monitoring system based on wireless transmission technique | |
| CN202331119U (en) | Intelligent flow rate monitoring wireless sensor network terminal device | |
| Cheng et al. | Coal mine safety monitoring system based on ZigBee and GPRS | |
| CN203894933U (en) | Radio frequency-based distributed wireless temperature acquisition device | |
| Ma et al. | The Design of Electrical Equipment Overheat Monitoring System on Electric Propulsion Ship Based on WSN | |
| Sun et al. | Design of a Wireless Sensor Network node based on STM32 | |
| CN205647517U (en) | Wireless central transmission node device of traffic intelligence based on 6LoWPAN technique |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20140627 |
|
| EXPY | Termination of patent right or utility model |