CN108615349A - Agricultural greenhouse data transmission system based on internet of things - Google Patents
Agricultural greenhouse data transmission system based on internet of things Download PDFInfo
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- CN108615349A CN108615349A CN201810842899.XA CN201810842899A CN108615349A CN 108615349 A CN108615349 A CN 108615349A CN 201810842899 A CN201810842899 A CN 201810842899A CN 108615349 A CN108615349 A CN 108615349A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The invention discloses the agricultural greenhouse data transmission systems based on Internet of Things,Including signal receiving circuit,Signal calibration circuit and feedback output circuit,The signal receiving circuit receives the signal of input terminal in the agricultural greenhouse control terminal data transmission channel based on Internet of Things,The signal calibration circuit divides two-way to receive signal receiving circuit output signal,Use transport and placing device AR1 in input transport and placing device AR2 in-phase input ends after mutually amplification all the way,Two tunnels are after variable resistance RW2 partial pressures in input transport and placing device AR4 in-phase input ends,Two paths of signals inputs progress logarithm process in the logarithmic circuit of transport and placing device AR3 and triode Q2 compositions together simultaneously,Most afterwards through transport and placing device AR5 in input feedback output circuit after mutually amplifying,The feedback output circuit exports after forming triode regulator circuit voltage stabilizing with triode Q7 and voltage-stabiliser tube D5,Signal in agricultural greenhouse data transmission system of the detection based on Internet of Things in control terminal signal transmission passage in real time,And signal can be calibrated automatically.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to the agricultural greenhouse data transmission system based on Internet of Things.
Background technology
Agricultural greenhouse based on Internet of Things has not only liberated labour, reduces production cost, moreover it is possible to adjust crops term, carry
High production rate.During Facility Agriculture Development, the agricultural greenhouse control system based on Internet of Things is an indispensable technology.So
And the signal transmission in the agricultural greenhouse control terminal data transmission channel based on Internet of Things is by such environmental effects, due to agricultural
It is also the larger place of humidity that the inner and outer boundary's temperature difference of greenhouse is sometimes larger or even agricultural greenhouse is interior, is caused based on Internet of Things
Signal in agricultural greenhouse control terminal data transmission channel is asked in the transmission will appear abnormal signal, lead to distorted signals,
Therefore it needs in agricultural greenhouse data transmission system of the real-time ensuring based on Internet of Things in control terminal signal transmission passage
Stabilization that signal can be stablized and efficient transmission.
So the present invention provides a kind of new scheme to solve the problems, such as this.
Invention content
For the above situation, to overcome the defect of the prior art, purpose of the present invention is to provide the agricultures based on Internet of Things
Sparetime university's canopy data transmission system, have be skillfully constructed, the characteristic of human oriented design, in real time detect the agricultural greenhouse based on Internet of Things
Signal in data transmission system in control terminal signal transmission passage, and signal can be calibrated automatically, prevent distorted signals.
Its technical solution solved is the agricultural greenhouse data transmission system based on Internet of Things, including signal receiving circuit,
Signal calibration circuit and feedback output circuit, the signal receiving circuit receive the agricultural greenhouse control terminal number based on Internet of Things
According to the signal of input terminal in transmission channel, inputted after being filtered with the π type filter circuits of inductance L1 and capacitance C1, capacitance C2 compositions
In signal calibration circuit, the signal calibration circuit divides two-way to receive signal receiving circuit output signal, uses transport and placing device all the way
AR1 is the same as in input transport and placing device AR2 in-phase input ends, two tunnels input transport and placing device AR4 after variable resistance RW2 partial pressures is same after mutually amplifying
In phase input terminal, while two paths of signals is inputted in the logarithmic circuit of transport and placing device AR3 and triode Q2 compositions together at progress logarithm
It manages, in the signal input comparator AR2 inverting inputs after logarithm process, wherein triode Q1 detection abnormal signals are devised,
And abnormal signal is released completely to greatly, triode Q4 feedbacks transport and placing device AR2 outputs signal to transport and placing device AR1 inverting inputs
Interior, Regulate signal calibrates the current potential of circuit output signal, most afterwards through transport and placing device AR5 with input feedback output circuit after mutually amplifying
Interior, the feedback output circuit is set simultaneously with being exported after triode Q7 and voltage-stabiliser tube D5 composition triode regulator circuit voltage stabilizings
The compound circuit for having counted diode D6 and diode D7 compositions is fed back in transport and placing device AR1 in-phase input ends, plays calibration output
The effect of signal potential；
The signal calibration circuit includes transport and placing device AR1, one end of the homophase input terminating resistor R1 of transport and placing device AR1 and diode
The cathode of the anode of D3, diode D3 connects the contact 2 of variable resistance RW2, and the contact 3 of variable resistance RW2 connects triode Q1's
One end of the in-phase input end and resistance R4 of base stage and transport and placing device AR4, the collector of triode Q1 connect one end of inductance L2, electricity
Feel the cathode of another terminating diode D2 of L2, the other end of the positive connecting resistance R1 of diode D2, the emitter of triode Q1
One end of connecting resistance R3, the other end ground connection of resistance R3, the anti-phase input terminating resistor R5 of transport and placing device AR4, one end of resistance R6,
The other end ground connection of resistance R4, resistance R5, the output end of another termination transport and placing device AR4 of resistance R6 and the base stage of triode Q3 with
And one end of resistance R7, the collector of triode Q3 connect the inverting input of transport and placing device AR3, the emitter that three-level hangs energy Q connects fortune
The emitter of the output end of device AR3, the inverting input and triode Q2 of transport and placing device AR2 is put, the collector of triode Q2 connects
The in-phase input end of transport and placing device AR3, one end of resistance R9 and variable resistance RW2 contact 1, the base earth of triode Q2, electricity
Hinder one end of the output end and resistance R8 of another termination transport and placing device AR1 of R9, the same phase of another termination transport and placing device AR2 of resistance R8
Input terminal, output terminating resistor R11, one end of resistance R12 and one end of resistance R14 of transport and placing device AR2 and triode Q6's
Collector, the base stage of one end of another terminating resistor R10 and the collector of triode Q5 and triode Q6 of resistance R11, three
The other end of the other end and resistance R7 of the base stage connecting resistance R10 of pole pipe Q5, the emitter ground connection of triode Q5, triode Q6's
One end of emitter connecting resistance R13, the other end ground connection of resistance R13, the base stage of another termination triode Q4 of resistance R12, three
The emitter of pole pipe Q4 connects the anode of diode D4, and the cathode of diode D4 meets the inverting input of transport and placing device AR1, triode Q4
Collector connecting resistance R14 the other end and transport and placing device AR5 in-phase input end, the anti-phase input terminating resistor of transport and placing device AR5
One end of R15, resistance R16, the other end ground connection of resistance R15.
Due to the use of above technical scheme, the present invention has the following advantages that compared with prior art；
1. two paths of signals inputs carry out logarithm process in the logarithmic circuit that transport and placing device AR3 and triode Q2 are formed together, at logarithm
In signal input comparator AR2 inverting inputs after reason, variable resistance RW2 plays the effect of deamplification, the letter after decaying
Triode Q1 number could be driven to detect abnormal signal, and abnormal signal released completely to greatly, while in order to ensure signal electricity
Invariant position, transport and placing device AR4 is with phase amplified signal, and logarithmic circuit plays the effect of stabilization signal operating point, while in order to more accurate
Guarantee logarithmic circuit output signal stabilization, devise triode Q3 feedback signals, since logarithmic circuit output signal is
Negative signal, therefore transport and placing device AR2 plays the effect of adder, realizes the effect of automatic calibration signal, substantially increases signal
Stability.
2. with being exported after triode Q7 and voltage-stabiliser tube D5 composition triode regulator circuit voltage stabilizings, the stabilization of signal is improved
Property, in order to further ensure the stabilization of signal, the compound circuit for devising diode D6 and diode D7 compositions feeds back to amplifier
In device AR1 in-phase input ends, when triode regulator circuit output signal is not in normal signal range, diode D6 and diode
The compound circuit conducting of D7 compositions plays school through transport and placing device AR6 with being fed back in transport and placing device AR1 in-phase input ends after mutually amplifying
The effect of quasi- output signal current potential.
Description of the drawings
Fig. 1 is that the present invention is based on the module maps of the agricultural greenhouse data transmission system of Internet of Things.
Fig. 2 is that the present invention is based on the schematic diagrams of the agricultural greenhouse data transmission system of Internet of Things.
Specific implementation mode
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to figures 1 through attached drawing 2
To in the detailed description of embodiment, can clearly present.The structure content being previously mentioned in following embodiment is with specification
Attached drawing is reference.
Embodiment one, the agricultural greenhouse data transmission system based on Internet of Things, including signal receiving circuit, signal calibration electricity
Road and feedback output circuit, the signal receiving circuit receive the agricultural greenhouse control terminal data transmission channel based on Internet of Things
The signal of interior input terminal, input signal calibrates electricity after being filtered with the π type filter circuits of inductance L1 and capacitance C1, capacitance C2 compositions
In road, the signal calibration circuit divides two-way to receive signal receiving circuit output signal, uses transport and placing device AR1 with mutually amplification all the way
It inputting in transport and placing device AR2 in-phase input ends afterwards, two tunnels input after variable resistance RW2 partial pressures in transport and placing device AR4 in-phase input ends,
Two paths of signals inputs progress logarithm process in the logarithmic circuit of transport and placing device AR3 and triode Q2 compositions, logarithm process together simultaneously
In signal input comparator AR2 inverting inputs afterwards, wherein devise triode Q1 detection abnormal signal, and by abnormal signal
It is released completely to greatly, triode Q4 feedbacks transport and placing device AR2 is outputed signal in transport and placing device AR1 inverting inputs, Regulate signal
The current potential of circuit output signal is calibrated, most afterwards through transport and placing device AR5 in input feedback output circuit after mutually amplifying, the feedback is defeated
Go out circuit with being exported after triode Q7 and voltage-stabiliser tube D5 composition triode regulator circuit voltage stabilizings, at the same devise diode D6 and
The compound circuit of diode D7 compositions is fed back in transport and placing device AR1 in-phase input ends, plays the effect of calibration output signal current potential；
The signal calibration circuit divides two-way to receive signal receiving circuit output signal, uses transport and placing device AR1 with mutually amplification all the way
It inputs in transport and placing device AR2 in-phase input ends afterwards, improves signal power, two tunnels input transport and placing device AR4 after variable resistance RW2 partial pressures
In in-phase input end, while two paths of signals inputs progress logarithm in the logarithmic circuit of transport and placing device AR3 and triode Q2 compositions together
It handling, in the signal input comparator AR2 inverting inputs after logarithm process, variable resistance RW2 plays the effect of deamplification,
Signal after decaying could drive triode Q1 to detect abnormal signal, and abnormal signal be released completely to greatly, while in order to
Ensure that signal potential is constant, transport and placing device AR4 is with phase amplified signal, and logarithmic circuit plays the effect of stabilization signal operating point, simultaneously
For the more accurate stabilization for ensureing logarithmic circuit output signal, triode Q3 feedback signals are devised, since logarithmic circuit is defeated
It is negative signal to go out signal, therefore transport and placing device AR2 plays the effect of adder, and triode Q4 feeds back transport and placing device AR2 output signals
To transport and placing device AR1 inverting inputs, transport and placing device AR2 output signal current potentials are further adjusted, automatic calibration signal is realized
Effect substantially increases the stability of signal, most afterwards after transport and placing device AR5 is with mutually amplification in input feedback output circuit, amplifier
The anode of one end and diode D3 of the homophase input terminating resistor R1 of device AR1, the cathode of diode D3 meet variable resistance RW2
Contact 2, the contact 3 of variable resistance RW2 meets the base stage of triode Q1 and the in-phase input end of transport and placing device AR4 and resistance R4
One end, the collector of triode Q1 meets one end of inductance L2, the cathode of another terminating diode D2 of inductance L2, diode D2
Positive connecting resistance R1 the other end, one end of the emitter connecting resistance R3 of triode Q1, resistance R3 the other end ground connection, amplifier
The anti-phase input terminating resistor R5 of device AR4, one end of resistance R6, resistance R4, resistance R5 the other end ground connection, resistance R6's is another
The output end and the base stage of triode Q3 and one end of resistance R7, the collector of triode Q3 of termination transport and placing device AR4 connects amplifier
The emitter of the inverting input of device AR3, three-level extension energy Q connects the anti-phase input of the output end of transport and placing device AR3, transport and placing device AR2
The emitter at end and triode Q2, the collector of triode Q2 connect the in-phase input end of transport and placing device AR3, resistance R9 one end and can
Become the contact 1 of resistance RW2, the base earth of triode Q2, the output end and resistance R8 of another termination transport and placing device AR1 of resistance R9
One end, the in-phase input end of another termination transport and placing device AR2 of resistance R8, output terminating resistor R11, the resistance of transport and placing device AR2
One end of R12 and the collector of one end of resistance R14 and triode Q6, one end of another terminating resistor R10 of resistance R11 and
The collector of triode Q5 and the base stage of triode Q6, the other end of the base stage connecting resistance R10 of triode Q5 and resistance R7's
The other end, the emitter ground connection of triode Q5, one end of the emitter connecting resistance R13 of triode Q6, another termination of resistance R13
Ground, the base stage of another termination triode Q4 of resistance R12, the emitter of triode Q4 meet the anode of diode D4, diode D4
Cathode connect the inverting input of transport and placing device AR1, the other end of the collector connecting resistance R14 of triode Q4 and transport and placing device AR5's
In-phase input end, the anti-phase input terminating resistor R15 of transport and placing device AR5, one end of resistance R16, the other end ground connection of resistance R15.
Embodiment two, on the basis of embodiment one, the feedback output circuit uses triode Q7 and voltage-stabiliser tube D5 groups
At being exported after triode regulator circuit voltage stabilizing, the stability of signal is improved, in order to further ensure the stabilization of signal, is devised
The compound circuit of diode D6 and diode D7 compositions is fed back in transport and placing device AR1 in-phase input ends, when triode regulator circuit
Output signal is not in normal signal range, and the compound circuit conducting of diode D6 and diode D7 compositions are same through transport and placing device AR6
It is fed back in transport and placing device AR1 in-phase input ends after mutually amplifying, plays the effect of calibration output signal current potential；The current collection of triode Q7
Pole connects one end of the output end of transport and placing device AR5 and the other end of resistance R16 and resistance R17, the base stage connecting resistance of triode Q7
The other end of R17, the anode of the cathode of voltage-stabiliser tube D5 and polar capacitor E2, the anode of diode D6 and diode D7 it is negative
Pole, the contact 2 of the contact 3 of variable resistance RW1 and variable resistance RW1, resistance R18 one end, another termination of resistance R18
The emitter on ground, triode Q7 connects contact 1 and the signal output port of variable resistance RW1, anode and the polarity electricity of voltage-stabiliser tube D5
Hold the cathode ground connection of E2, the cathode of diode D6 connects anode and one end of resistance R20 of diode D7, the other end of resistance R20
Connect one end of the in-phase input end and resistance R19 of transport and placing device AR6, the output end and two of another termination transport and placing device AR6 of resistance R19
The anode of pole pipe D2, one end of the anti-phase input terminating resistor R21 of transport and placing device AR6, the other end ground connection of resistance R21.
Embodiment three, on the basis of embodiment one, the signal receiving circuit receives the agricultural greenhouse based on Internet of Things
The signal of input terminal in control terminal data transmission channel, with inductance L1 and capacitance C1, the π type filter circuits of capacitance C2 compositions
After filtering in input signal calibration circuit, the anti-interference of signal, one end of a termination capacitor C1 of inductance L1, voltage stabilizing are improved
The cathode and signal input port of pipe D1, the plus earth of voltage-stabiliser tube D1, the other end ground connection of capacitance C1, the other end of inductance L1
Connect the anode of one end and diode D2 of capacitance C2, the other end ground connection of capacitance C2.
When the present invention is specifically used, the agricultural greenhouse data transmission system based on Internet of Things, including signal receiving circuit, letter
Number calibration circuit and feedback output circuit, the signal receiving circuit receive the agricultural greenhouse control terminal data based on Internet of Things
The signal of input terminal in transmission channel inputs after being filtered with the π type filter circuits of inductance L1 and capacitance C1, capacitance C2 compositions and believes
Number calibration circuit in, the signal calibration circuit divide two-way receive signal receiving circuit output signal, all the way use transport and placing device AR1
With signal power in input transport and placing device AR2 in-phase input ends, is improved after mutually amplifying, two tunnels input after variable resistance RW2 partial pressures
In transport and placing device AR4 in-phase input ends, while two paths of signals is inputted together in the logarithmic circuit of transport and placing device AR3 and triode Q2 compositions
Logarithm process is carried out, in the signal input comparator AR2 inverting inputs after logarithm process, variable resistance RW2 plays decaying letter
Number effect, the signal after decaying could drive triode Q1 to detect abnormal signal, and abnormal signal be released completely to greatly,
Simultaneously in order to ensure that signal potential is constant, for transport and placing device AR4 with phase amplified signal, logarithmic circuit plays the effect of stabilization signal operating point
Fruit, while for the more accurate stabilization for ensureing logarithmic circuit output signal, triode Q3 feedback signals are devised, due to right
Number circuit output signal is negative signal, therefore transport and placing device AR2 plays the effect of adder, triode Q4 feedback transport and placing devices AR2
It outputs signal in transport and placing device AR1 inverting inputs, further adjusts transport and placing device AR2 output signal current potentials, realize automatic school
The effect of calibration signal substantially increases the stability of signal, most afterwards through transport and placing device AR5 with input feedback output circuit after mutually amplifying
Interior, the feedback output circuit is improved with being exported after triode Q7 and voltage-stabiliser tube D5 composition triode regulator circuit voltage stabilizings
The stability of signal devises the compound circuit of diode D6 and diode D7 compositions in order to further ensure the stabilization of signal
It feeds back in transport and placing device AR1 in-phase input ends, when triode regulator circuit output signal is not in normal signal range, diode
The compound circuit conducting of D6 and diode D7 compositions feed back to transport and placing device AR1 in-phase input ends after transport and placing device AR6 is with mutually amplification
It is interior, play the effect of calibration output signal current potential.
The above is to combine specific implementation mode is made for the present invention to be further described, and it cannot be said that the present invention
Specific implementation is limited only to this；For belonging to the present invention and for those skilled in the technology concerned, based on skill of the present invention
Under the premise of art scheme thinking, made by expand and operating method, data replacement, should all fall the scope of the present invention it
It is interior.
Claims (3)
1. the agricultural greenhouse data transmission system based on Internet of Things, including signal receiving circuit, signal calibration circuit and feedback are defeated
Go out circuit, which is characterized in that it is logical that the signal receiving circuit receives the agricultural greenhouse control terminal data transmission based on Internet of Things
The signal of input terminal in road, input signal is calibrated after being filtered with the π type filter circuits of inductance L1 and capacitance C1, capacitance C2 compositions
In circuit, the signal calibration circuit divides two-way to receive signal receiving circuit output signal, uses transport and placing device AR1 is same mutually to put all the way
After big in input transport and placing device AR2 in-phase input ends, two tunnels input transport and placing device AR4 in-phase input ends after variable resistance RW2 partial pressures
It is interior, while two paths of signals inputs carry out logarithm process in the logarithmic circuit that transport and placing device AR3 and triode Q2 are formed together, at logarithm
In signal input comparator AR2 inverting inputs after reason, wherein devise triode Q1 detection abnormal signal, and by abnormal letter
It number releases completely to greatly, triode Q4 feedbacks transport and placing device AR2 is outputed signal in transport and placing device AR1 inverting inputs, adjusts letter
The current potential of number calibration circuit output signal, most afterwards through transport and placing device AR5 with after mutually amplifying in input feedback output circuit, the feedback
Output circuit exports after forming triode regulator circuit voltage stabilizing with triode Q7 and voltage-stabiliser tube D5, while devising diode D6
It is fed back in transport and placing device AR1 in-phase input ends with the compound circuit of diode D7 compositions, plays the effect of calibration output signal current potential
Fruit；
The signal calibration circuit includes transport and placing device AR1, one end of the homophase input terminating resistor R1 of transport and placing device AR1 and diode
The cathode of the anode of D3, diode D3 connects the contact 2 of variable resistance RW2, and the contact 3 of variable resistance RW2 connects triode Q1's
One end of the in-phase input end and resistance R4 of base stage and transport and placing device AR4, the collector of triode Q1 connect one end of inductance L2, electricity
Feel the cathode of another terminating diode D2 of L2, the other end of the positive connecting resistance R1 of diode D2, the emitter of triode Q1
One end of connecting resistance R3, the other end ground connection of resistance R3, the anti-phase input terminating resistor R5 of transport and placing device AR4, one end of resistance R6,
The other end ground connection of resistance R4, resistance R5, the output end of another termination transport and placing device AR4 of resistance R6 and the base stage of triode Q3 with
And one end of resistance R7, the collector of triode Q3 connect the inverting input of transport and placing device AR3, the emitter that three-level hangs energy Q connects fortune
The emitter of the output end of device AR3, the inverting input and triode Q2 of transport and placing device AR2 is put, the collector of triode Q2 connects
The in-phase input end of transport and placing device AR3, one end of resistance R9 and variable resistance RW2 contact 1, the base earth of triode Q2, electricity
Hinder one end of the output end and resistance R8 of another termination transport and placing device AR1 of R9, the same phase of another termination transport and placing device AR2 of resistance R8
Input terminal, output terminating resistor R11, one end of resistance R12 and one end of resistance R14 of transport and placing device AR2 and triode Q6's
Collector, the base stage of one end of another terminating resistor R10 and the collector of triode Q5 and triode Q6 of resistance R11, three
The other end of the other end and resistance R7 of the base stage connecting resistance R10 of pole pipe Q5, the emitter ground connection of triode Q5, triode Q6's
One end of emitter connecting resistance R13, the other end ground connection of resistance R13, the base stage of another termination triode Q4 of resistance R12, three
The emitter of pole pipe Q4 connects the anode of diode D4, and the cathode of diode D4 meets the inverting input of transport and placing device AR1, triode Q4
Collector connecting resistance R14 the other end and transport and placing device AR5 in-phase input end, the anti-phase input terminating resistor of transport and placing device AR5
One end of R15, resistance R16, the other end ground connection of resistance R15.
2. the agricultural greenhouse data transmission system based on Internet of Things as described in claim 1, which is characterized in that the feedback output
Circuit includes triode Q7, and the collector of triode Q7 connects the output end of transport and placing device AR5 and the other end and resistance of resistance R16
One end of R17, the other end of base stage connecting resistance R17 of triode Q7, the anode of the cathode of voltage-stabiliser tube D5 and polar capacitor E2, two
The anode of the pole pipe D6 and cathode of diode D7, the contact 3 of variable resistance RW1 and the contact 2 of variable resistance RW1, resistance
The emitter of one end of R18, the other end ground connection of resistance R18, triode Q7 connects contact 1 and the signal output of variable resistance RW1
Port, the anode of voltage-stabiliser tube D5 and the cathode of polar capacitor E2 are grounded, and the cathode of diode D6 connects the anode and electricity of diode D7
One end of resistance R20, one end of the in-phase input end and resistance R19 of another termination transport and placing device AR6 of resistance R20, resistance R19's
The anode of the output end and diode D2 of another termination transport and placing device AR6, the one of the anti-phase input terminating resistor R21 of transport and placing device AR6
End, the other end ground connection of resistance R21.
3. the agricultural greenhouse data transmission system based on Internet of Things as claimed in claim 1 or 2, which is characterized in that the signal
Receiving circuit includes inductance L1, one end of a termination capacitor C1 of inductance L1, the cathode and signal input port of voltage-stabiliser tube D1, surely
The plus earth of pressure pipe D1, the other end ground connection of capacitance C1, one end of another termination capacitor C2 of inductance L1 and diode D2's
Anode, the other end ground connection of capacitance C2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810842899.XA CN108615349A (en) | 2018-07-27 | 2018-07-27 | Agricultural greenhouse data transmission system based on internet of things |
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|---|---|---|---|
| CN201810842899.XA CN108615349A (en) | 2018-07-27 | 2018-07-27 | Agricultural greenhouse data transmission system based on internet of things |
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