CN102118432A - Wireless multimedia sensor node system oriented to field ecological monitoring - Google Patents
Wireless multimedia sensor node system oriented to field ecological monitoring Download PDFInfo
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Abstract
The embodiment of the invention provides a wireless multimedia sensor node system oriented to the field ecological monitoring. By virtue of a wireless multimedia sensor network in the shape of a net or a tree or a star or a cluster, a wireless multimedia sensor of the system sends the acquired multimedia information of a field environment after data processing and data fusion to a central monitoring station through a gateway node; and a solar photovoltaic generating set selects a charging strategy of constant voltage or constant current or maximum power point tracking or trickling charge by monitoring the electrical quantity of a storage battery in a real time manner, and provides proper voltage to each part of the wireless multimedia sensor through a DC-DC conversion circuit. The wireless multimedia sensor node system has low design cost, low power consumption and perfect function, can be suitably arranged in the field environment in large quantities, and can achieve better coverage; and meanwhile, the system is supplied electricity by a solar battery, so that the problem that the energy is limited when the wireless sensor network is arranged in the field can be solved.
Description
Technical field
The present invention relates to the wireless senser field, relate in particular to a kind of wireless multimedia sensor node system towards open-air ecological monitoring.
Background technology
At present, wireless sensor network (WSN, Wireless Sensor Network) owing to merged sensor technology, embedded computing technique, distributed information processing and the communication technology, becoming a kind of brand-new information and obtain and treatment technology, is one of emerging technology in the world today.Wireless sensor network technology have self-organizing, self adaptation, data-centered, towards concrete application, advantage such as volume is little, cost is low, the monitored area is wide, this technology is used widely in various fields such as military and national defense, biologic medical, environmental monitoring, city management and hazard predictions.
And the wireless multimedia sensor network technology is to grow up on the basis of traditional wireless sensor networks, it is novel wireless sensor network with multimedia messages perceptions such as video, images, it not only has the characteristics of traditional wireless sensor networks such as self-organizing, unattended operation, also organically combine with multimedia technology, it is faster to have transmission speed, characteristics such as network capabilities is stronger, and Processing tasks is more complicated, and perceptible medium is abundanter.Wireless video (image) transmission is the new direction that wireless sensor network is used, along with wireless sensor network technology research deeply and the superiority that numerous application embodied, about the wireless multimedia sensor network technology in the application study in open-air ecological monitoring field, also be subjected to increasing scientific worker and expert's attention, become the current research focus.
The wireless multimedia sensor device is the hardware foundation platform of wireless multimedia sensor network, exploitation is the prerequisite that the wireless multimedia sensor network technology is pushed practical application to towards the wireless multimedia sensor device of open-air ecological monitoring, but lack ripe complete correlation technique in the prior art, cause this application can not obtain fine popularization towards open-air ecological monitoring.
Summary of the invention
The embodiment of the invention provides a kind of wireless multimedia sensor node system towards open-air ecological monitoring, and low, low in energy consumption, the perfect in shape and function of this system design cost can be suitable for being deployed in the wild environment in a large number, and reach better coverage; The problem that the wireless sensor network energy is limited of arranging has greatly been alleviated in the open air by solar cell for supplying power in this system simultaneously.
The embodiment of the invention provides a kind of wireless multimedia sensor node system towards open-air ecological monitoring, and described system comprises wireless multimedia sensor device and solar energy photovoltaic generator, wherein:
Described wireless multimedia sensor device is by forming the wireless multimedia sensor network of netted, tree-shaped, star-like or sub-clustering, and the multimedia messages of the wild environment that collects through data processing and fusion, is sent to monitoring master station by gateway node;
Described solar energy photovoltaic generator is by monitoring the electric weight of storage battery in real time, select the charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge, and provide suitable voltage for the various piece of described wireless multimedia sensor device by the DC-DC translation circuit.
Described wireless multimedia sensor device further comprises:
Image capture module is used to gather the image multimedia messages of wild environment;
The other types sensor interface module is used for the data message of other types such as collecting temperature, humidity;
The ZigBee wireless module is used to transmit the data message that described image capture module and described other types sensor interface module are collected;
Node Controller is used to coordinate to control the work of described image capture module, other types sensor interface module and ZigBee wireless module.
Described Node Controller is connected with described image capture module by built-in integrated circuit bus, control bus, data/address bus, link to each other by asynchronous reception/dispensing device, analog/digital interface and described other types sensor interface module, be connected by serial peripheral interface bus, control bus and described ZigBee wireless module.
Described solar energy photovoltaic generator further comprises:
Solar panel is used for charging to the storage battery of described solar energy photovoltaic generator;
The Buck buck circuit is used for changing the voltage and current of described solar panel output, to realize the charging of various strategies by changing duty ratio PWM;
The current/voltage Acquisition Circuit is used for gathering in real time the output voltage electric current of described solar panel and the charging voltage and current of described storage battery;
Charge controller is used to realize that described solar energy photovoltaic generator carries out the closed-loop control of each stage charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge;
The DC-DC translation circuit is used to the various piece of described wireless multimedia sensor device that the various burning voltages of 5V, 3.3V, 24V are provided;
The gate output circuit is equivalent to switch, is used for cutting off when certain module of described system does not need to power its power supply, to save electric energy.
Described solar panel is connected with storage battery by described Buck buck circuit, and described storage battery is connected with described DC-DC translation circuit again;
Described DC-DC translation circuit provides burning voltage for described charge controller;
The analog/digital interface of described current/voltage Acquisition Circuit and described charge controller links to each other;
The pulse-width modulation interface of described Buck buck circuit and described charge controller is connected;
The control end of described gate output circuit is connected with the I/O port of described charge controller.
PID control, FUZZY ALGORITHMS FOR CONTROL are adopted in described constant current, constant voltage and trickle charge;
The voltage-tracing method of deciding, disturbance observation are adopted in described MPPT maximum power point tracking charging, ring comparison method and FUZZY ALGORITHMS FOR CONTROL stagnate.
By the above-mentioned technical scheme that provides as can be seen, described system comprises wireless multimedia sensor device and solar energy photovoltaic generator, wherein said wireless multimedia sensor device is by forming the wireless multimedia sensor network of netted, tree-shaped, star-like or sub-clustering, the multimedia messages of the wild environment that collects through data processing and fusion, is sent to monitoring master station by gateway node; Described solar energy photovoltaic generator is by monitoring the electric weight of storage battery in real time, select the charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge, and provide suitable voltage for the various piece of described wireless multimedia sensor device by DC-DC transfer circuit.Low, low in energy consumption, the perfect in shape and function of this system design cost can be suitable for being deployed in the wild environment in a large number, and reaches better coverage; The problem that the wireless sensor network energy is limited of arranging has greatly been alleviated in the open air by solar cell for supplying power in this system simultaneously.
Description of drawings
Fig. 1 provides the structural representation of wireless multimedia sensor node system for the embodiment of the invention;
Fig. 2 is the charging process schematic flow sheet of solar energy photovoltaic generator that the embodiment of the invention provides;
Fig. 3 provides the minimum system circuit diagram of Node Controller in the wireless multimedia sensor device for the embodiment of the invention;
Fig. 4 provides the CMOS camera of image capture module in the wireless multimedia sensor device and the circuit diagram of other types sensor interface for the embodiment of the invention;
Fig. 5 provides the radio frequency transmission modular circuit schematic diagram of ZigBee wireless module in the wireless multimedia sensor device for the embodiment of the invention;
Fig. 6 is provided charge controller minimum system circuit diagram in the solar energy photovoltaic generator by the embodiment of the invention;
Fig. 7 is provided Buck buck circuit schematic diagram in the solar energy photovoltaic generator by the embodiment of the invention;
Fig. 8 is provided current/voltage Acquisition Circuit schematic diagram in the solar energy photovoltaic generator by the embodiment of the invention;
Fig. 9 provides the circuit diagram of DC-DC translation circuit in the solar energy photovoltaic generator for the embodiment of the invention;
Figure 10 provides the circuit diagram of gate output circuit in the solar energy photovoltaic generator for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of wireless multimedia sensor node system towards open-air ecological monitoring, and low, low in energy consumption, the perfect in shape and function of this system design cost can be suitable for being deployed in the wild environment in a large number, and reach better coverage; The problem that the wireless sensor network energy is limited of arranging has greatly been alleviated in the open air by solar cell for supplying power in this system simultaneously.
For better describing embodiment of the present invention, now in conjunction with the accompanying drawings the specific embodiment of the present invention is described, being illustrated in figure 1 as the embodiment of the invention provides the structural representation of wireless multimedia sensor system, system comprises the two large divisions described in Fig. 1, be respectively wireless multimedia sensor device and solar energy photovoltaic generator, wherein:
The wireless multimedia sensor device is by forming the wireless multimedia sensor network of netted, tree-shaped, star-like or sub-clustering, and the multimedia messages of the wild environment that collects through data processing and fusion, is sent to monitoring master station by gateway node;
Solar energy photovoltaic generator is by monitoring the electric weight of storage battery in real time, select the charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge, and provide suitable voltage for the various piece of described wireless multimedia sensor device by the DC-DC translation circuit.
Further, the wireless multimedia sensor device among Fig. 1 can also comprise:
Image capture module is used to gather the image multimedia messages of wild environment;
The other types sensor interface module is used for the data message of other types such as collecting temperature, humidity;
The ZigBee wireless module is used to transmit the data message that described image capture module and described other types sensor interface module are collected, and is concrete as the radio frequency transmission module among Fig. 1.
Node Controller is used to coordinate to control the work of described image capture module, other types sensor interface module and ZigBee wireless module.
Connected mode between above-mentioned each module is: Node Controller is by built-in integrated circuit bus 12C bus (Inter-Integrated Circuit), control bus, data/address bus is connected with described image capture module, by universal asynchronous reception/transmission dress UART (Universal Asynchronous Receiver/Transmitter), analog/digital A/D (Analog-to-Digital) interface links to each other with described other types sensor interface module, by serial peripheral interface bus SPI (Serial Peripheral Interface), control bus is connected with described ZigBee wireless module.
Further, the solar energy photovoltaic generator among Fig. 1 can also comprise:
Solar panel is used for charging to the storage battery of described solar energy photovoltaic generator;
The Buck buck circuit is used for changing the voltage and current of described solar panel output, to realize the charging of various strategies by changing duty ratio PWM;
The current/voltage Acquisition Circuit is used for gathering in real time the output voltage electric current of described solar panel and the charging voltage and current of described storage battery;
Charge controller is used to realize that described solar energy photovoltaic generator carries out the closed-loop control of each stage charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge;
The DC-DC translation circuit is used to the various piece of described wireless multimedia sensor device that the various burning voltages of 5V, 3.3V, 24V are provided;
The gate output circuit is equivalent to switch, is used for cutting off when certain module of described system does not need to power its power supply, to save electric energy.
Connected mode between above-mentioned each module is: solar panel is connected with storage battery by described Buck buck circuit, and described storage battery is connected with described DC-DC translation circuit again; Described DC-DC translation circuit provides burning voltage for described charge controller; The A/D interface of described current/voltage Acquisition Circuit and described charge controller links to each other; The pulse-width modulation PWM of described Buck buck circuit and described charge controller (Pulse Width Modulation) interface is connected; The control end of described gate output circuit is connected with the I/O port of described charge controller.
In addition, above-mentioned wireless multimedia sensor device adopts the working method of monitoring host computer active request, sensor node passive response, specifically: the wireless multimedia sensor device is received after the acquisition that monitoring host computer sends, gather a pictures, and picture carried out compression based on wavelet transformation, be forwarded to next routing node then, finally beam back monitoring host computer by gateway node.
And above-mentioned solar energy photovoltaic generator can be taked the charging method of 4 kinds of strategies according to the electric weight situation of storage battery, is respectively constant current charge, constant voltage charge, MPPT (MPPT maximum power point tracking) charging and trickle charge; All be closed-loop control in the charging in each stage, wherein constant current charge, constant voltage charge, trickle charge can be adopted (proportional-integral-differential) PID control, fuzzy control scheduling algorithm; The MPPT charging can be adopted the voltage-tracing method of deciding, disturbance observation, ring comparison method, FUZZY ALGORITHMS FOR CONTROL etc. stagnate.
Come the work disposal of above-mentioned wireless multimedia sensor device and the charging process of solar energy photovoltaic generator are described in detail with concrete example below, the concrete course of work of wireless multimedia sensor device is:
Remote worker's operation supervise and control main frame sends the order to the request inquiry of wild environment information, and this order is sent to router by the Internet; Router is checked routing table selection purpose telegon according to the order of receiving, the purpose telegon carries out communication broadcasting to bunch branch of a network that is under the jurisdiction of it, wake up need inquiry bunch bunch head, bunch head broadcasts to this bunch member node again, activate the dormancy node and carry out data communication, each node here promptly is the wireless multimedia sensor device; Node images acquired information then, because the data volume of image is bigger, so node must carry out sending after the image compression again, we adopt method of wavelet to compress; After bunch head receives the data of all nodes, carry out that data are synthetic to be handled, Yan Yuanlu feeds back to monitoring host computer.
In said process, if do not find or with purpose network coordinator Communications failure, then lose this packet and produce report information and return to monitoring host computer and file; Most nodes in system are in resting state, to save energy, prolong the network survivability phase.
Be illustrated in figure 2 as the charging process schematic flow sheet of solar energy photovoltaic generator, the conversion in each stage in the concrete charging process should have certain allowance according to the directivity of voltage up-down.When raising, the line of demarcation of constant voltage charge and trickle charge is decided to be and is upward through 13.5V as voltage; Voltage is when reducing, and the line of demarcation of constant voltage charge and trickle charge is decided to be and is passed down through 12.5V, other similar, concrete as among Fig. 2:
When battery terminal voltage U 〉=13.8V, stop charging.
When battery terminal voltage 13.0V≤U≤13.8V, trickle charge.
When battery terminal voltage 12.0V≤U≤13.0V, constant voltage charge.
When battery terminal voltage U≤12.0V, and charging current MPPT charging during less than 1.5A.
When battery terminal voltage U≤12.0V, and charging current is carried out the constant current charge of 1.5A during greater than 1.5A.
When battery terminal voltage U＜10.0V, cut off power supply to node.
All be closed-loop control in the charging in above-mentioned each stage, wherein constant current charge, constant voltage charge, trickle charge can be adopted PID control, fuzzy control scheduling algorithm; The MPPT charging can be adopted the voltage-tracing method of deciding, disturbance observation, ring comparison method, FUZZY ALGORITHMS FOR CONTROL etc. stagnate.
Below with concrete example to said system in the structural circuit of each main modular be described in detail, in the specific implementation process:
Fig. 3 is the minimum system circuit diagram of Node Controller in the wireless multimedia sensor device; This Node Controller has been selected the AT91SAM7x512 of Atmel company, this chip is based on ARM7TDMI, the kernel of RISC, operating frequency 48MHz, have the Flash of 512KB and the SRAM of 128KB, and have abundant peripheral hardware on the upper side such as SPI, TWI, UDP etc., its unique DMA (Direct Memory Access) makes it more quick when the very big data volume of access.
Fig. 4 is the CMOS camera of image capture module in the wireless multimedia sensor device and the circuit diagram of other types sensor interface; The transducer of this CMOS camera has been selected the OV7620 of U.S. OmniVision company, it is 1/3 inch, 300,000 pixel CMOS color image sensor chips, this chip integrates CMOS photoinduction nuclear and peripheral auxiliary circuits, has control able to programme and mixes functions such as output with video mould/number.The SCCB interface that uses in the sensor chip is in function and use and the 12C bus is compatible, in output digital video stream, also provide pixel clock PCLK, horizontal reference signal HREF, vertical synchronizing signal VSYNC to be convenient to the external circuit reading images, and the HREF of setting able to programme, VSYNC window at image local, the output window image, view data links to each other with master controller by 16 data wires.
The transducer of other types has been selected soil moisture sensor EC-5, the blade face humidity sensor of U.S. Decagon company, and the signal of their output analog quantitys is received the AD port of ARM7; Temperature Humidity Sensor has been selected the incorporate transducer SHT11 of humiture of Switzerland Sensirion company for use, it has digital output, exempt to debug, non-calibrating, auto sleep and characteristics in the immersion water fully, and the data output form is accurate 12C, receives the 12C interface of ARM7; Automatic weather station is as the collector of other parameters such as wind speed and direction, and data are output as the serial ports form, receives the UART0 of ARM7.
Fig. 5 is the radio frequency transmission modular circuit schematic diagram of ZigBee wireless module in the wireless multimedia sensor device; This radio frequency transmission module has selected the CC2520 of TI company to add the combination of CC2591.CC2520 and CC2591 only need two holding wires and several control lines, can control this chip operation at sending mode, low gain receiving mode, high-gain receptive pattern by different control commands, can realize seamless link.
Fig. 6 is a charge controller minimum system circuit diagram in the solar energy photovoltaic generator; This charge controller has been selected the MSP430F147 single-chip microcomputer of TI for use, it is a kind of 16 Flash single-chip microcomputers of super low-power consumption, its internal resource is abundant, and memory capacity is big, and the FLASH ROM of 32KB+256B and the RAM of 1KB are arranged, 6 I/O ports, an accurate analog comparator, WatchDog Timer in 2 timers, sheet with seizure/comparand register, 12 high-performance A/D converters of 2 serial communication interfaces and 8 external channels possess the in-system programming ability.Its power consumption is 280 μ A/MIPS when 2.2V, standby response time＜6 μ s, and MSP430 operating voltage VDD is set at 3.3V.
Fig. 7 is a Buck buck circuit schematic diagram in the solar energy photovoltaic generator; It is the Buck circuit of core that this Buck buck circuit has adopted with P-MOSFET IRF7416, is mainly used in by changing the PWM duty ratio, changes the voltage and current of solar panel output, to realize the charging of various strategies.Solar panel output farad capacitor in parallel is steady to guarantee the solar cell output voltage, and the 8050 and 8550 totem output circuits of forming are the drive circuit of IRF7417.
Fig. 8 is a current/voltage Acquisition Circuit schematic diagram in the solar energy photovoltaic generator; Wherein: voltage acquisition adopts the method for electric resistance partial pressure to gather with AD; Connected on the power line sampling resistor of 0.330hm/1W of current acquisition, 10 times of differential amplifier circuits forming by difference LM324 are given the AD mouth of charge controller then.In addition, same circuits is adopted in the measurement of the output voltage electric current of solar panel.
Fig. 9 is the circuit diagram of DC-DC translation circuit in the solar energy photovoltaic generator; Wherein:
The 5V stabilized voltage power supply has adopted LM2596, and its work is simple efficient, has the current load ability of 3A, and input voltage range is big, is the switch voltage-stabilizing chip; The switching frequency of LM2596 is fixing 130KHZ, and when being input as 12v, when being output as 5v, conversion efficiency is about 82%, is a times of linear voltage regulator conversion efficiency.
3.3V stabilized voltage power supply is selected the TPS7333 super low-power consumption ultra low differential pressure single channel linear voltage regulator of Texas Instrument (TI).Output voltage is 0V during the TPS7333 resting state, IO=0.01 μ A; Output voltage is 3.3V during operating state, maximum output current 2A.TPS7333 monitors the undervoltage condition of stabilizer output voltage by an internal comparator, and the RESET pin will be restarted pressurizer when system is in under-voltage condition.The direct voltage of input can be adjusted into 3.3V by TPS7333.
In addition, system adopts the DC-DC translation circuit of MC34063AD as the 12V/24V voltage conversion circuit, and the 12V voltage transitions of autonomous voltage raising and reducing circuit is the needed 24V operating voltage of infrared ray flame detector in the future.Integrated oscillator in the MC34063AD, efficient is high and heat radiation is few, does not need to add heat abstractor usually.In the outside resistive feedback circuit that inserts of MC34063AD, to obtain required voltage output, the resistance of resistance can be calculated according to the voltage transformation formula of DC-DC Switching Power Supply in the feedback circuit.
Figure 10 is the circuit diagram of gate output circuit in the solar energy photovoltaic generator, and this gate output circuit is equivalent to switch, is used for cutting off when certain module of described system does not need to power its power supply, to save electric energy.
It should be noted that in the foregoing description that each included module is just divided according to function logic, but is not limited to above-mentioned division, as long as can realize function corresponding; In addition, the concrete title of each module also just for the ease of mutual differentiation, is not limited to protection scope of the present invention.
In sum, low, low in energy consumption, the perfect in shape and function of the system design cost that the embodiment of the invention provided can be suitable for being deployed in the wild environment in a large number, and reaches better coverage; The problem that the wireless sensor network energy is limited of arranging has greatly been alleviated in the open air by solar cell for supplying power in this system simultaneously.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (6)
1. the wireless multimedia sensor node system towards open-air ecological monitoring is characterized in that described system comprises wireless multimedia sensor device and solar energy photovoltaic generator, wherein:
Described wireless multimedia sensor device is by forming the wireless multimedia sensor network of netted, tree-shaped, star-like or sub-clustering, and the multimedia messages of the wild environment that collects through data processing and fusion, is sent to monitoring master station by gateway node;
Described solar energy photovoltaic generator is by monitoring the electric weight of storage battery in real time, select the charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge, and provide suitable voltage for the various piece of described wireless multimedia sensor device by DC-to-DC DC-DC translation circuit.
2. the system as claimed in claim 1 is characterized in that, described wireless multimedia sensor device further comprises:
Image capture module is used to gather the image multimedia messages of wild environment;
The other types sensor interface module is used for the data message of other types such as collecting temperature, humidity;
The ZigBee wireless module is used to transmit the data message that described image capture module and described other types sensor interface module are collected;
Node Controller is used to coordinate to control the work of described image capture module, other types sensor interface module and ZigBee wireless module.
3. system as claimed in claim 2, it is characterized in that, described Node Controller is connected with described image capture module by built-in integrated circuit bus, control bus, data/address bus, link to each other by universal asynchronous reception/dispensing device, analog/digital interface and described other types sensor interface module, be connected by serial peripheral interface bus, control bus and described ZigBee wireless module.
4. the system as claimed in claim 1 is characterized in that, described solar energy photovoltaic generator further comprises:
Solar panel is used for charging to the storage battery of described solar energy photovoltaic generator;
The Buck buck circuit is used for changing the voltage and current of described solar panel output, to realize the charging of various strategies by changing duty ratio PWM;
The current/voltage Acquisition Circuit is used for gathering in real time the output voltage electric current of described solar panel and the charging voltage and current of described storage battery;
Charge controller is used to realize that described solar energy photovoltaic generator carries out the closed-loop control of each stage charging strategy of constant voltage, constant current, MPPT maximum power point tracking or trickle charge;
The DC-DC translation circuit is used to the various piece of described wireless multimedia sensor device that the various burning voltages of 5V, 3.3V, 24V are provided;
The gate output circuit is equivalent to switch, is used for cutting off when certain module of described system does not need to power its power supply, to save electric energy.
5. system as claimed in claim 4 is characterized in that,
Described solar panel is connected with storage battery by described Buck buck circuit, and described storage battery is connected with described DC-DC translation circuit again;
Described DC-DC translation circuit provides burning voltage for described charge controller;
The analog/digital interface of described current/voltage Acquisition Circuit and described charge controller links to each other;
The pulse-width modulation interface of described Buck buck circuit and described charge controller is connected;
The control end of described gate output circuit is connected with the I/O port of described charge controller.
6. the system as claimed in claim 1 is characterized in that,
PID control, FUZZY ALGORITHMS FOR CONTROL are adopted in described constant current, constant voltage and trickle charge;
The voltage-tracing method of deciding, disturbance observation are adopted in described MPPT maximum power point tracking charging, ring comparison method and FUZZY ALGORITHMS FOR CONTROL stagnate.
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| CN103823909A (en) * | 2014-02-25 | 2014-05-28 | 北京农业信息技术研究中心 | Field information acquisition system and method |
| CN103915871A (en) * | 2014-03-28 | 2014-07-09 | 安徽农业大学 | Photovoltaic power management unit taking measurement and control nodes of agricultural Internet of things as orientation |
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| CN107148087A (en) * | 2017-03-29 | 2017-09-08 | 南京邮电大学 | Self-powered Temperature Humidity Sensor network based on solar energy collecting |
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