CN203773279U - Light-simple-type agricultural intelligent fertigation control system based on ARM - Google Patents
Light-simple-type agricultural intelligent fertigation control system based on ARM Download PDFInfo
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- CN203773279U CN203773279U CN201420137378.1U CN201420137378U CN203773279U CN 203773279 U CN203773279 U CN 203773279U CN 201420137378 U CN201420137378 U CN 201420137378U CN 203773279 U CN203773279 U CN 203773279U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Abstract
The utility model discloses a light-simple-type agricultural intelligent fertigation control system based on an ARM. The system comprises a liquid level sensor, a pH sensor, an Ec sensor, a soil humidity sensor, a controller, a water pump, a water inlet valve, a flowmeter, a proportion fertilization pump, a fertilizer absorption pipe, a nutrient solution mother liquid tank, a first filter, a regulating valve, a second filter, an irrigation valve and an upper computer. The upper computer is configured with a man-machine interaction unit. The controller is communicated with the upper computer. By using a traditional manual irrigation mode, labor force cost is high; a water and fertilizer resource utilization rate is low and so on. By using the system of the utility model, the above problems are solved; soil and environment pollution is effectively mitigated; intelligent and automatic fertigation is realized.
Description
Technical field
The utility model relates to a kind of light skeleton symbol intelligent irrigation fertilization control system, is particularly useful in agricultural greenhouse greenhouse crops drip irrigation system.
Background technology
Before the utility model is created, two kinds of modes are mainly taked in the intelligent irrigation fertilising of industrialized agriculture: (1) adopts microcontroller to carry out program setting to fertigation time, fertigation amount, realizes fertigation robotization; (2) fertigation equipment configures advanced computer control system, can realize the automatic control of Different Nutrition liquid concentration, Different Irrigation pattern and the accurate allotment of different growth phase crop irrigation fertilising desired nutritional liquid.The former has broken away from man-made irrigation mode, reduce labour intensity, there is certain water saving joint fertilizer efficiency fruit, realize fertigation robotization, but intelligent level is not high, can not be according to plant growth demand, carry out the time of infertility moisture and nutrient quantitatively, regularly, in proportion supply, can not monitor in real time Irrigation and fertilization system, be difficult to realize accurate and effective fertigation.The latter adopts the technology such as Ec/pH Comprehensive Control, time control and automatic monitoring, can and realize online mixed fertilizer, accurately fertilising by crop desired nutritional liquid concentration by the required duty of crop, rate of fertilizer application automatic irrigation, fertilising.But current domestic intelligent irrigation fertilizer apparatus automatization level is lower, in development, mainly relies on external import.
Water-fertilizer integral Precision Irrigation fertilizer practice is the Precision Irrigation fertilising new agricultural technology combining together with fertilising irrigating, and is also the gordian technique of industrialized agriculture fertigation.This technology is by Novel microirrigation system, the solution that soluble solids fertilizer or liquid fertilizer are dissolved, together with irrigation water, is transported to crop root soil evenly, exactly, and can be according to plant growth demand, carry out the time of infertility moisture and nutrient quantitatively, regularly, in proportion supply.By accurate Controlled irrigation amount, rate of fertilizer application, irrigation and fertilization time, not only can effectively improve liquid manure resource utilization, and contribute to improve output, saving resource, minimizing environmental pollution.This technology has taken into full account the law of nutritive absorption of crop, forms formula according to crop actual demand, and nutrient is precisely provided.
Summary of the invention
The purpose of this utility model is to provide the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM, the technical matters that the utility model solves is to adopt embedded technology and automatic monitoring technology to realize water-fertilizer integral fertigation, develop light skeleton symbol agricultural intelligent irrigation fertilizer apparatus, improve traditional industrialized agriculture fertigation device intelligence level not high, can not take into full account that crop different growing stages is to problems such as nutrient demands, and the defect of the intelligent irrigation fertilizing equipment of external import existence: package import system cost is higher, after-sales service difficulty, and be not exclusively suitable for Chinese water quality and soil characteristic.
The technical solution of the utility model is: based on the light skeleton symbol agricultural intelligent irrigation fertilization control system of ARM, comprise liquid level sensor, pH sensor, Ec sensor, soil humidity sensor, controller, water pump, water intaking valve, flowmeter, ratio fertilizing pump, fertilzer sucking pipe, nutrient solution mother vat, the first filtrator, variable valve, the second filtrator and irrigation valve;
The water delivering orifice of described water pump connects the water inlet of ratio fertilizing pump, and on the outlet pipeline of water pump, is provided with water intaking valve and flowmeter;
One end of described fertilzer sucking pipe is positioned at nutrient solution mother vat, and the other end connects the nutrient input entrance of ratio fertilizing pump, is provided with the first filtrator and variable valve on fertilzer sucking pipe;
In the pipeline that the water delivering orifice of described ratio fertilizing pump connects, be provided with the second filtrator and irrigation valve;
The signal of described soil humidity sensor collection is input to controller;
Described liquid level sensor is arranged in nutrient solution mother vat, and the signal of liquid level sensor collection is input to controller;
PH and the Ec of the irrigation liquid that described pH sensor and Ec sensor are exported for detection of ratio fertilizing pump water delivering orifice, and the signal collecting is input to controller;
The signal of described flowmeter collection is input to controller;
Described controller is by the Push And Release of IO mouth control water intaking valve, variable valve and irrigation valve;
Also comprise host computer;
Described host computer disposes man-machine interaction unit;
Described controller is communicated by letter with described host computer.
Be more preferably technical scheme, described controller adopts STM32F103ZET6.
Be more preferably technical scheme, described man-machine interaction unit adopts touch-screen to realize.
Be more preferably technical scheme, described controller and described host computer adopt serial communication.
Be more preferably technical scheme, described controller is by the Push And Release of relay module control water intaking valve, variable valve and irrigation valve.
Be more preferably technical scheme, described ratio fertilizing pump adopts the U.S. auspicious ratio fertilizing pump of the safe fragrant TEFEN-MixRite of Israel.
Be more preferably technical scheme, described touch-screen adopts the HMI configuration type graphic control panel able to programme of Guangzhou Wei Qian company.
The ratio fertilizing pump that the utility model technology is mentioned belongs to the art known technology, is not described in detail.
Compared with prior art, the beneficial effects of the utility model are: (1) the utility model has solved the problems such as the labor cost that Traditional Man irrigation method brings is high, liquid manure resource utilization is low, effectively alleviate soil and environment pollution, realized fertigation intellectuality, robotization.(2) for the serious present situation disconnecting of the main dependence on import of China's intelligent irrigation fertilizer apparatus, automatic fertilizing device and market demand, the light skeleton symbol agricultural intelligent irrigation fertilizer apparatus of the utility model development can replace imported product, greatly reduce chamber crop Tree Precise Fertilization cost, the production efficiency and the product quality that have improved industrialized agriculture, have stronger generalization and applicability.(3) the utility model device volume is little, simple to operate, can move freely, and conveniently in multiple greenhouses, uses.(4) the utility model device has significant water saving effect, has improved utilization rate of fertilizer and crop yield, has reduced labour intensity, has saved labour cost.(5) the utility model system hardware configuration is high, and stable performance is cheap.System core equipment STM32F103ZET6 industry control module, micro-embedding WQT series touch-screen Ec/pH monitor are realized production domesticization, reduce system cost.Topworks is solenoid valve, the water pump of import, has ensured the reliability and stability of system.The utility model is specially adapted to the occasion of the intelligent fertigation of large-scale many greenhouse soilless cultures.
Brief description of the drawings
Fig. 1 crop alimentary liquid is demarcated schematic flow sheet;
The physical construction schematic diagram of the light skeleton symbol agricultural intelligent irrigation fertilization control system of Fig. 2 the utility model based on ARM;
Wherein 1 is touch-screen, the 2nd, and control box, the 3rd, ratio fertilizing pump, the 4th, fertilzer sucking pipe, the 5th, mixed fertile valve, the 6th, water intaking valve, the 7th, flowmeter, the 8th, water inlet, the 9th, pulley, the 10th, liquid level sensor, the 11st, nutrient solution mother vat, the 12nd, integral support, the 13rd, irrigation valve, the 14th, Ec electrode, the 15th, PH electrode, the 16th, water delivering orifice, the 17th, self-priming pump.
The light skeleton symbol agricultural intelligent irrigation fertilization control system pipeline schematic diagram of Fig. 3 the utility model based on ARM;
The light skeleton symbol agricultural intelligent irrigation fertilization control system circuit theory schematic diagram of Fig. 4 the utility model based on ARM;
Specific embodiment software control procedure process flow diagram of Fig. 5.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Based on the light skeleton symbol agricultural intelligent irrigation fertilization control system of ARM, comprise liquid level sensor, pH sensor, Ec sensor, soil humidity sensor, controller, water pump, water intaking valve, flowmeter, ratio fertilizing pump, fertilzer sucking pipe, nutrient solution mother vat, the first filtrator, variable valve, the second filtrator and irrigation valve; The water delivering orifice of described water pump connects the water inlet of ratio fertilizing pump, and on the outlet pipeline of water pump, is provided with water intaking valve and flowmeter; One end of described fertilzer sucking pipe is positioned at nutrient solution mother vat, and the other end connects the nutrient input entrance of ratio fertilizing pump, is provided with the first filtrator and variable valve on fertilzer sucking pipe; In the pipeline that the water delivering orifice of described ratio fertilizing pump connects, be provided with the second filtrator and irrigation valve; The signal of described soil humidity sensor collection is input in controller; Described liquid level sensor is arranged in nutrient solution mother vat, and the signal of liquid level sensor collection is input to controller; PH and the Ec of the irrigation liquid that described pH sensor and Ec sensor are exported for detection of ratio fertilizing pump water delivering orifice, and the signal collecting is input to controller; The signal of described flowmeter collection is input to controller; Described controller is by the Push And Release of IO mouth control water intaking valve, variable valve and irrigation valve; Also comprise host computer; Described host computer disposes man-machine interaction unit; Described controller is communicated by letter with described host computer.Wherein, described controller adopts STM32F103ZET6.Wherein, described man-machine interaction unit adopts touch-screen to realize, and this touch-screen adopts the HMI configuration type graphic control panel able to programme of Guangzhou Wei Qian company.Described controller and described host computer adopt serial communication.Described controller is by the Push And Release of relay module control water intaking valve, variable valve and irrigation valve.Described ratio fertilizing pump adopts the U.S. auspicious ratio fertilizing pump of the safe fragrant TEFEN-MixRite of Israel.
Fig. 1, in industrialized agriculture soilless culture, because the contained nutrient of cultivation matrix is very micro-or almost do not have, therefore must rely on nutrient solution to provide completely.The general fertilizer that adopts full dissolubility, is first mixed with nutrient solution mother liquor, is diluted to certain concentration supply plant when irrigation again.Ratio between demand and the various nutritional labeling thereof of Different Crop to various nutritional labelings there are differences, so first selected raise crop, with reference to its tested recipe, select corresponding fertilizer preparation nutrient solution mother liquor, Ec value to nutrient solution, pH value are demarcated again, the final dilution ratio of determining the different growth phase nutritional needs of applicable crop.
Fig. 2, this figure is the three-dimensional simulation figure by the light skeleton symbol agricultural intelligent irrigation fertilizer apparatus of Computer Design, this device is mainly by touch-screen 1, control box 2, ratio fertilizing pump 3, fertilzer sucking pipe 4, mixed fertile valve 5, water intaking valve 6, flowmeter 7, water inlet 8, pulley 9, liquid level sensor 10, nutrient solution mother vat 11, integral support 12, irrigation valve 13, Ec electrode 14, PH electrode 15, water delivering orifice 16, self-priming pump 17 forms.This device can move flexibly use between different greenhouses, uses quick seal coupling to be connected with the pipeline in greenhouse efficiently, by drip irrigation system, realizes fertigation.Control box adopts waterproof and dampproof design, can adapt to the hygrothermal environment in greenhouse, can in greenhouse, place for a long time, can set flexibly fertilization program by the panel button of control box, to adapt to Different Crop demand.
Fig. 3, it is the uniform condition precedent of fertilising that fertilizer liquid and water mix.In the utility model device, ratio fertilizing pump is selected the U.S. auspicious ratio fertilizing pump of the safe fragrant TEFEN-MixRite of Israel, this pump accurate measurement, there is very high reliability, its principle of work: fertilzer sucking pipe and ratio fertilizing pump main body are to combine by a piston machine core bar that is connected to flow dynamic, this is equipped with the piston machine bar only flowing backwards and rotates in a right cylinder, when hydraulic pressure is gone out, the fertilizer solution being contained in bottom container must be sucked in current by pipeline is even.Owing to relying on hydraulic drives, the soakage of solution is directly proportional to the water yield that enters fertilizing pump, can not change with the flow of main water pipeline and pressure surge, and the rich water ratio of mixing is constant.
From angle cost-saving, that increase economic efficiency, in research, select solid fertilizer configuration nutrient solution mother liquor.Due to the compatibility issue between multiple fertilizer, after mixing, can produce precipitation, this can bring the problem of 2 aspects: on the one hand, nutrient solution mother liquor produces precipitation, and Ec value and the pH value that can cause diluting rear irrigation liquid are not accurate enough; On the other hand, because irrigation pipeline is less, easily result in blockage with the irrigation liquid of precipitation, affect stability and the accuracy of system operation.For above problem, default, before manuring irrigation, starts self-priming pump circulation mixotrophism liquid mother liquor, for ratio fertilizing pump provides well-mixed nutrient solution mother liquor.In addition, system adopts two-stage filtration, and the high concentration solution in nutrient solution mother vat is injected into and is irrigated in main water pipeline by fertilizing pump through primary filter, more finally enters drip irrigation zone through secondary filtration.
The pulse number that controller is exported by flowmeter calculates the water yield, judges by program whether actual aquifer yield reaches set amount, just automatically cuts off solenoid valve in the time that duty reaches setting value, automatically controls duty thereby realize.Nutrient solution mother vat bottom is provided with liquid level sensor, automatically detects liquid level by program, and when water level is during lower than setting value, variable valve cuts out, and fertilizing pump is no longer drawn nutrient solution mother liquor, and sends corresponding alarm.
Fig. 4, fertilization control system is the core of the accurate ratio fertilizer applicator of light skeleton symbol, comprises controller, touch-screen (having comprised host computer and man-machine interaction unit), soil humidity sensor, liquid level sensor, Ec sensor, pH sensor, relay module and power management module etc.System controller is selected the STM32F103ZET6 industry control module based on ARMCortex-M3 kernel, cost performance is high, powerful, can intactly realize the general utility functionss such as data acquisition, storage, warning, equipment control, meet Based Intelligent Control and the management of various facilities environments.Touch-screen is selected the HMI configuration type graphic control panel able to programme of Guangzhou Wei Qian company, comprises hardware (WQT series touch-screen), two parts of software (the super serial ports screen WQTDesigner of software for editing).Hardware using ARM9 high-speed CPU (400MHZ), digital TFTLCD (LED-backlit demonstration), high precision electro resistive touch-screen.Software can Fast Construction and is generated embedded computer supervisory control system running program, and engineering is taking window as unit, the graphical interfaces of structuring user's operational system.When the I/O cause for gossip of STM32F103ZET6 industry control module, read the data that each sensor gathers, through A/D conversion and corresponding calculation process, utilize serial ports to communicate by letter with host computer (touch-screen) foundation, realize host computer Real-Time Monitoring bottom data.Topworks's driving circuit (relay module) of the program of setting by controller and peripheral hardware, realizes the control to topworks's (solenoid valve).
Fig. 5, Design of System Software specifically comprises: hardware, software initialization, button instruction input, information demonstration, information storage, control algolithm, sampling processing, monitoring and alarm.Intelligent irrigation fertilising is controlled and can be carried out whole process control, the Ec of Real-Time Monitoring irrigation liquid, pH value, nutrient solution mother liquor liquid level to irrigation system, reclaim Ec value and the soil moisture of liquid, show in real time by host computer, simultaneously by data storage, so that historical information inquiry.User can selecting system control model: manually control and Based Intelligent Control.Under manual control model, realize manual touch-control fertilising, fertilization time and rate of fertilizer application are arranged by operator.Under Based Intelligent Control pattern, controller calls fertilising strategy, according to the soil moisture of Real-Time Monitoring and the Ec value of recovery liquid, determines online rate of fertilizer application and fertilization time, realizes intelligent irrigation.
The factor that affects irrigation volume is a lot, the growth period of crop, and crop growing state and some weathers and environmental factor, as Various Seasonal, intensity of illumination, indoor temperature, relative air humidity etc., all can affect irrigation volume.Irrigation should meet the demand of crop to moisture and nutrient, is unlikely again the waste that causes rich water.Expert recommends the irrigation principle of solid matrix cultivation as follows both at home and abroad: the soil moisture of crop root maintains within the scope of 60%-80% is advisable; Irrigation liquid and recovery liquid Ec value differ and are no more than 0.4-0.5ms/cm; The 15%-30% that the recovery water yield accounts for total irrigation volume is advisable; The pH that reclaims liquid should be at 5.0-6.0; Irrigation should be on a small quantity repeatedly.The utility model is set soil moisture 65% for irrigating lower limit, and soil moisture 80% is for irrigating higher limit.When soil moisture is lower than 65% time, crop is irrigated; When soil moisture is higher than 80% time, stop irrigating.System reclaims the Ec value of liquid difference after irrigating according to the irrigation liquid Ec value detecting before irrigating and last time judges whether crop needs fertilising, the selected Ec difference of the utility model equals 0.5mS/cm as judgment standard, in the time that Ec difference exceedes 0.5mS/cm, crop is applied fertilizer; Otherwise, do not apply fertilizer.If the soil moisture detecting is lower than 70%, Ec difference exceedes 0.5mS/cm simultaneously, pays the utmost attention to the demand of crop to nutrient, and crop is applied fertilizer; When Ec difference is less than 0.5mS/cm, soil moisture higher than 70% time, stop fertilising.
Embedded technology and automatic monitoring technology are applied to the fertilising of water-fertilizer integral Precision Irrigation by the utility model, the light skeleton symbol agricultural intelligent irrigation fertilization control system fertile device of design based on ARM, taking STM32F103ZET6 industry control module as control core, be equipped with relevant sensor assembly and master system, form the irrigation system that automatic irrigation, automatic fertilization and nutrient solution concentration are accurately controlled.By the optimal combination of hardware and software, autonomous Design and the manufacture of automatic fertigation control system are carried out.According to the different needs of Different Crop, conductivity and potential of hydrogen to irrigation liquid are accurately controlled.System man-machine interface close friend, powerful, practical.This device performance excellence, have simple to operate, water and fertilizer utilization is high and save the distinguishing feature such as labor cost.The utility model comprises STM32F103ZET6 industry control module, Ec sensor, pH sensor, soil humidity sensor, liquid level sensor, flowmeter, touch-screen, fertilizing pump, topworks, topworks's driving circuit, Monitor Computer Control System.Each sensor assembly Real-time Collection corresponding data in this programme, the I/O mouth of STM32F103ZET6 industry control module first carries out A/D conversion by the data that read, and data are carried out to corresponding calculation process, then sends to host computer by serial ports, and shows in real time and storage.Utilize touch-screen to set up friendly man-machine interface, can pass through user interface input control order, supervisory system duty, query history information etc.System has 2 kinds of control modes: manually control and Based Intelligent Control.Press manual control button on interface, control corresponding topworks, realize manual touch-control fertigation, fertigation time and fertigation amount are controlled by operator; Press Based Intelligent Control button on interface, system call intelligence fertilization program, according to the soil moisture of Real-Time Monitoring and the Ec value of recovery liquid, determines rate of fertilizer application and fertilization time online, realizes intelligent irrigation.
Requirement for the different growth phases of crop to concentration of fertilizer, the mother liquor that soluble solids fertilizer is dissolved into variable concentrations, together with irrigation water, is transported to crop root according to a certain percentage in good time, in right amount, exactly, reaches with fertile water transfer, short fertile with water, realize precision irrigation fertilising.In the design of light skeleton symbol agricultural intelligent irrigation fertilizer apparatus, comprise the body design of portable ratio fertilizer applicator, the design of fertilizer applicator on-line monitoring system and the design of intelligent irrigation fertilization control system.The design of on-line monitoring system realizes and comprises the Ec of irrigation liquid, the on-line monitoring of pH, nutrient solution mother liquor liquid level on-line monitoring, the on-line monitoring of matrix soil humidity.Control system comprises two kinds of fertigation modes, the one, by the corresponding button on touching touch-screen, realize manual fertigation, and the fertigation time is artificially set.Another kind of be according to the related data of the intelligent irrigation fertilising strategy of formulating in controller and on-line monitoring system Real-Time Monitoring (soil moisture, reclaim liquid liquid level, reclaim liquid Ec value), realize intelligent irrigation and fertilising.Ratio fertilizing pump, taking flowing pressure water as power, does not need other any power settings, and ratio is adjustable in 0.4%～4% scope.The sensors such as Ec, pH, liquid level, soil moisture are to correlation parameter Real-time Collection and send in slave computer (controller), through A/D conversion and corresponding calculation process, utilize serial communication to import host computer into, realize the real-time demonstration of data, man-machine interaction.
Claims (7)
1. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM, it is characterized in that, comprise liquid level sensor, pH sensor, Ec sensor, soil humidity sensor, controller, water pump, water intaking valve, flowmeter, ratio fertilizing pump, fertilzer sucking pipe, nutrient solution mother vat, the first filtrator, variable valve, the second filtrator and irrigation valve;
The water delivering orifice of described water pump connects the water inlet of ratio fertilizing pump, and on the outlet pipeline of water pump, is provided with water intaking valve and flowmeter;
One end of described fertilzer sucking pipe is positioned at nutrient solution mother vat, and the other end connects the nutrient input entrance of ratio fertilizing pump, is provided with the first filtrator and variable valve on fertilzer sucking pipe;
In the pipeline that the water delivering orifice of described ratio fertilizing pump connects, be provided with the second filtrator and irrigation valve;
The signal of described soil humidity sensor collection is input to controller;
Described liquid level sensor is arranged in nutrient solution mother vat, and the signal of liquid level sensor collection is input to controller;
PH and the Ec of the irrigation liquid that described pH sensor and Ec sensor are exported for detection of ratio fertilizing pump water delivering orifice, and the signal collecting is input to controller;
The signal of described flowmeter collection is input to controller;
Described controller is by the Push And Release of IO mouth control water intaking valve, variable valve and irrigation valve;
Also comprise host computer;
Described host computer disposes man-machine interaction unit;
Described controller is communicated by letter with described host computer.
2. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 1, is characterized in that, described controller adopts STM32F103ZET6.
3. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 1, is characterized in that, described man-machine interaction unit adopts touch-screen to realize.
4. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 1, is characterized in that, described controller and described host computer adopt serial communication.
5. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 1, is characterized in that, described controller is by the Push And Release of relay module control water intaking valve, variable valve and irrigation valve.
6. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 1, is characterized in that, described ratio fertilizing pump adopts the U.S. auspicious ratio fertilizing pump of the safe fragrant TEFEN-MixRite of Israel.
7. the light skeleton symbol agricultural intelligent irrigation fertilization control system based on ARM according to claim 3, is characterized in that, described touch-screen adopts the HMI configuration type graphic control panel able to programme of Guangzhou Wei Qian company.
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- 2014-03-25 CN CN201420137378.1U patent/CN203773279U/en not_active Expired - Fee Related
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