CN203178820U

CN203178820U - Embedded liquid level monitoring device based on ARM

Info

Publication number: CN203178820U
Application number: CN 201320159577
Authority: CN
Inventors: 苏静明; 洪炎; 姚善化
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2013-04-02
Filing date: 2013-04-02
Publication date: 2013-09-04
Anticipated expiration: 2023-04-02

Abstract

The utility model discloses an embedded liquid level monitoring device based on ARM. According to a liquid level signal acquisition and processing module, liquid level of a water tank and the like is acquired by using a WL400 water level sensor; water pressure signals are converted into 4-20mA current signals; with a 125ohm resistor, the signals can be converted into 0.5-2.5V DC voltage signals; the voltage signals are connected into an ARM9 master controller analog-to-digital conversion module, such that liquid level height rapid digitization processing is realized; with an embedded intelligent PID controller, comparison operation of liquid level real-time height and liquid level preset height, and intelligent PID control operation are carried out, such that magnetic pump novel frequency operation parameters are obtained; through a digital-to-analog conversion channel, the parameters are converted into analog and are connected into a frequency converter; the frequency converter adjusts the rotation speed of the magnetic pump, such that the adjustment upon water tank water supply volume is achieved, and preset requirement of liquid level height is satisfied. Assembly, commissioning and maintenance of the system provided by the utility model are simple. Through programmed control, water level monitoring and drawing of history curves of water level controlling and the like can be realized. Maintenance is greatly convenient, and maintenance cost is reduced.

Description

Embedded liquid level monitoring device based on ARM

Technical field

The utility model relates to the liquid level monitoring technical field, relates in particular to a kind of embedded liquid level monitoring device based on ARM.

Background technology

Along with constant development of economy, huge numbers of families have used energy-efficient equipment, from the electric light to sun power, arrive various small household appliances again.Wherein the utilization rate of sun power is soaring year by year, yet most sun power still belongs to traditional non intelligent formula product, namely open water supply valve and close water valve by the mode of craft, this mode is inefficiency, but also easy waste water resource, even some people's carelessness, forget that closing water valve causes family not had by water logging, brings no small economic loss.Therefore the intelligent level of improving solar facilities is brought into schedule.

Solar product has many types now, intelligentized non intelligentization that also have arranged, the moving then thousands of units of intelligentized product, surpass about several thousand yuan of non intelligent products, for common common people, this cost is higher relatively, and the liquid level control accuracy of most of products is general, more can not realize network monitoring, along with the development of technology of Internet of things, we more and more wish household and other system are all networked, to realize comprehensive monitoring, but early stage level monitoring system is not to be the network-type liquid level monitoring device all, because the still common single-chip microcomputer that it adopts mostly, its network communicating function is limited, for this reason, utilize embedded system to change traditional Single-chip Controlling mode, utilize intelligent control algorithm to change traditional liquid level controlling method, can improve the networked control level of current level monitoring system effectively, cater to Internet of Things era development requirement, the intelligent control algorithm of its implantation more can greatly improve the liquid level control accuracy on the other hand, reduces the waste of water resource.Certainly the research of this device also can be used for industrial control field, also can play the purpose of not only improving control performance but also improving its intelligent remote monitoring level for high water tank control aspect.

Therefore, the embedded liquid level frequency-converting control device of network-type that the research of this device has intelligent processing capacity, the setting demand that can keep liquid level, it is the balance between water tank set amount and the output, make the pressure stability of water supply in specific scope, can save waste and the motor water supply consumption of water resource again to a certain extent, this is the main research motivation of this patent.

Current, along with power electronics and computer technology, the intelligent frequency-conversion speed adjusting technique, continuous development and the maturation of Based Intelligent Control and telecommunication technique, for certain theoretical foundation has been established in the research of this patent, meanwhile, continuous upgrading based on the ARM embedded system technology, it is easy to learn, function is complete, characteristics such as cost performance height have namely been simplified system's design, improved system performance again, shorten the design cycle, reduced the production design cost, and it also has fast operation, low in energy consumption, the advantage of the strong aspect of network communications capability, this also provides technical support for the design of the embedded liquid level monitoring device of intelligence.

The utility model content

The utility model purpose is exactly in order to remedy the defective of prior art, a kind of have real-time control and telecommunications functions and the embedded liquid level monitoring device based on ARM all over the body to be provided.

The utility model is achieved through the following technical solutions:

A kind of embedded liquid level monitoring device based on ARM, include the ARM9 master controller that has the fuzzy-PID control algorithm, the DA converter, frequency converter, pump motor, water supply network, single water tank that holds, liquid level sensor and RJ-45 Ethernet interface, the output terminal of described frequency converter connects pump motor, pump motor is connected with described water supply network, water supply network connects described single water tank that holds, described single bottom that holds water tank is provided with liquid level sensor, described liquid level sensor links to each other with the AD ALT-CH alternate channel of described ARM9 master controller by signal pre-processing circuit, the ARM9 master controller is connected with described DA converter, the output port of DA converter connects the input end of described frequency converter, described ARM9 master controller passes through CS8900 network interface unit and described RJ-45 interface access network based on ethernet, and links to each other with host computer.

The model of described ARM9 master controller is ARM9S3C2410, and the model of described liquid level sensor is WL400, and the model of described frequency converter is ACS510, and the model of described DA converter is AD5552.

Pin GPC.2, the GPC.3, GPC.4 and the TXD that are connected to the ARM9 master controller between described ARM9 master controller and the DA converter respectively with the pin of DA converter ,

, DIN is connected with SCLK.

ADC ALT-CH alternate channel in the described ARM9 master controller is 8 tunnel 10 ALT-CH alternate channels.

The utility model has the advantages that: the utility model is that the ARM9 master controller of kernel makes up the real-time acquisition process of intelligent liquid level variable frequency control and intelligent fuzzy frequency-converting control device with S3C2410,8 traditional monolithic processor control devices have been replaced, arithmetic speed and the precision of control system have been improved, reduced system cost, real time execution ability and bigger storage capacity have realized effective transplanting of Intelligent Fuzzy Control algorithm fast to utilize embedded system, utilize calculation process ability working time of having reduced complicated control algolithm efficiently such as embedded system multi-process, improved the processing capability in real time of system, performance obviously is better than conventional Single-chip Controlling mode; On the other hand, because the network interface unit that embedded system carries inserts the internet with control system effectively easily, the telecommunications functions that makes pressure become system processed obviously strengthens, effectively improved the remotely intelligently monitoring level of liquid level control controlling unit, realization in time regularly the remotely intelligently monitoring of liquid level controlling unit, satisfied user's requirement; By transplanting the intelligent fuzzy pid control algorithm in the ARM9 master controller, make that this liquid level, control device have stronger adaptivity, response speed is fast, control system is simple, and systems control division divides simply arranges the high reliability of further having brought system; The employing blocking arranges, and the system line of making is intuitively easy, and it is very easy that the installation of system, debugging and maintenance become, and can realize the drafting of history curve that water level monitoring, water level are controlled etc. by programming Control; Be easy to safeguard, because system is simple, be very easy to maintenance, reduce maintenance cost.

Description of drawings

Fig. 1 is the utility model overall system block diagram.

Fig. 2 is the utility model network-type embedded intelligence control minimum system block diagram.

Fig. 3 is the utility model D/A conversion frequency conversion output control driver element.

Fig. 4 is the utility model network communication interface drives unit.

Embodiment

As shown in Figure 1, a kind of embedded liquid level monitoring device based on ARM, include the ARM9 master controller 1 that has the fuzzy-PID control algorithm, DA converter 2, frequency converter 3, pump motor 4, water supply network 5, single water tank 9 that holds, liquid level sensor 6 and RJ-45 Ethernet interface 10, the output terminal of described frequency converter 3 connects pump motor 4, pump motor 4 is connected with described water supply network 5, water supply network 5 connects described single water tank 9 that holds, described single bottom that holds water tank 9 is provided with liquid level sensor 6, described liquid level sensor 6 is connected with the AD ALT-CH alternate channel of described ARM9 master controller 1 with signal pre-processing circuit 8 by a resistance 7, ARM9 master controller 1 is connected with described DA converter 2, the output port of DA converter 2 connects the input end of described frequency converter 3, described ARM9 master controller 1 is connected with described RJ-45 Ethernet interface 10 by the CS8900 network interface unit, and is connected with host computer.

The model of described ARM9 master controller 1 is ARM9S3C2410, and the model of described liquid level sensor 6 is WL400, and the model of described frequency converter 3 is ACS510, and the model of described DA converter 2 is AD5552.

Pin GPC.2, the GPC.3, GPC.4 and the TXD that are connected to ARM9 master controller 1 between described ARM9 master controller 1 and the DA converter 2 respectively with the pin of DA converter 2

,

, DIN is connected with SCLK.

ADC ALT-CH alternate channel in the described ARM9 master controller 1 is 8 tunnel 10 ALT-CH alternate channels.

Figure 1 shows that the utility model overall system block diagram.Single high water tank height that holds has determined the pipe network actual water supply.Can be seen that by Fig. 1 The whole control system is coupled together water supply network 5, pump motor 4 and main control part by liquid level sensor.Gather single water tank 9 liquid levels that hold by liquid level sensor 6, liquid level sensor 6 is converted to electric signal with water level signal, insert the high-speed ADC ALT-CH alternate channel of ARM9 master controller 1 inside, be converted into digital signal, then by the calculation process module, regularly try to achieve the water level average, the water level value that has intelligent control module that itself and water system are set then compares, obtain the deviate of height of water level, again through embedded intelligence fuzzy-variable frequency control parameter that the controlled system of the soft controller of PID is new, be converted to the output frequency that removes to control frequency converter after the simulating signal, and then the rotating speed of control pump motor 4, single liquid level that holds water tank 9 is satisfied set requirement, reach new balance.Wherein, this embedded tank level control system adopts is the liquid level that WL400 liquid level sensor 6 is gathered water tanks etc., hydraulic signal is converted to the current signal of 4-20mA, connect the female resistance in 125 Europe and can be exchanged into 0.5-2.5 V dc voltage signal, this voltage signal inserts embedded system ADC ALT-CH alternate channel AIN2 access the most at last, and it is 0 ~ 3.3v that the input of AIN2 requires; The variable frequency control of water pump is to use the intelligent fuzzy pid control module that is implanted in the embedded system to finish by comparison, intelligent fuzzy pid control computation, three steps of variable frequency control output of water level instantaneous value and setting value, the operation result of intelligent fuzzy PID control is digital quantity, need link to each other with external D/A conversion chip AD5552 by serial line interface, constantly utilize numeral output to regulate the frequency output parameter of frequency converter A CS510; Monitoring module utilizes socket technology and embedded ICP/IP protocol stack to realize and being connected and telecommunication of host computer by the Ethernet card interface, finish the real-time remote monitoring of high water tank height and Frequency Converter Control parameter etc., finally finish the design of embedded liquid level frequency conversion supervising device.

Figure 2 shows that the embedded minimum control system of the utility model, also is real-time main control unit, mainly comprises the electric supply system module, can be the power supply signal that kernel, Ethernet communication, JTAG debugging, A/D transformation energy provide 1.8 ~ 5V; Crystal oscillating circuit provides various clock signals for system; System reset circuit can effectively improve the reliability of system, prevents that CPU from sending false command; But inner ADC interface timing acquiring ductwork pressure data utilize internal register ADDR storage transformation result for inquiry; Control parameter and external DAC interface chip realize that by serial mode the control parameter is to the serial transmission of DAC; Ethernet interface module is finished the convenient Ethernet of access of embedded system, and then realizes the telecommunication based on UDPSOCKET.

Figure 3 shows that the utility model variable frequency control digital-to-analogue driving circuit, major function is to realize that by D/A converter module the S3C2410 embedded system is to the control output of frequency converter A CS510, and then finish the rotating speed of pump motor is controlled, then reach adjusting upper hose net flow and regulate liquid level real-time and accurately to reach, and can be energy-conservation effectively.Based on the S3C2410 of ARM9 by GPC.2 and AD5552 analog to digital converter

Link to each other, utilize GPC.3 and AD5552

Link to each other, utilize serial line interface GPC.4 to link to each other with DIN, realize the input of serial data, utilize TXD to realize that the clock of AD5552 drives signal and inserts, link to each other with the SCLK of AD5552, data are introduced the DAC register at the rising edge of SCLK by clock signal, and realize the D/A conversion.The output of conversion directly links to each other with the ACS510 frequency converter by the Vout end, finishes the simulation transmission of variable frequency control parameter.

Figure 4 shows that the utility model network communication interface circuit, major function is to utilize the CS8900 network interface unit with the RJ-45 network interface embedded constant pressure frequency conversion control system to be inserted the enterprises Ethernet fast and link to each other with the upper monitoring main frame.S3C2410 realizes that with CS8900 hardware is connected shown in Fig. 4, adopted the CS8900 chip among the figure, its encapsulation is 100-pin TQFP, inside is integrated at sheet RAM, the 10base-T transceiving filter, and provide 8 and 16 two kinds of interfaces, CS8900 is connected according to 16 modes with S3C2410 chip based on arm9, its address bus ADDR19-ADDR0 links to each other with the A19-A0 of CS8900A, data bus DATA15-DATA0 links to each other with the D15-D0 of CS8900A, realize the read-write of CS8900A is controlled by gate circuit, link to each other with the address latch signal AEN of CS8900 by nGCS3, realize linking to each other with the interrupt request pin INTRQ0 of CS8900 by external interrupt pin EINT8, realize the read-write control linkage of the network interface card CS8900 of S3C2410, the acquiescence working method was that I/O connects after network card chip resetted, and its plot is 300H.

Claims

1. embedded liquid level monitoring device based on ARM, it is characterized in that: include the ARM9 master controller that has the fuzzy-PID control algorithm, the DA converter, frequency converter, pump motor, water supply network, single water tank that holds, liquid level sensor and RJ-45 Ethernet interface, the output terminal of described frequency converter connects pump motor, pump motor is connected with described water supply network, water supply network connects described single water tank that holds, described single bottom that holds water tank is provided with liquid level sensor, described liquid level sensor links to each other with the AD ALT-CH alternate channel of described ARM9 master controller by signal pre-processing circuit, the ARM9 master controller is connected with described DA converter, the output port of DA converter connects the input end of described frequency converter, described ARM9 master controller passes through CS8900 network interface unit and described RJ-45 interface access network based on ethernet, and links to each other with host computer.

2. the embedded liquid level monitoring device based on ARM according to claim 1, it is characterized in that: the model of described ARM9 master controller is ARM9S3C2410, the model of described liquid level sensor is WL400, the model of described frequency converter is ACS510, and the model of described DA converter is AD5552.

3. the embedded liquid level monitoring device based on ARM according to claim 1 is characterized in that: pin GPC.2, the GPC.3, GPC.4 and the TXD that are connected to the ARM9 master controller between described ARM9 master controller and the DA converter respectively with the pin of DA converter

,

, DIN is connected with SCLK.

4. the embedded liquid level monitoring device based on ARM according to claim 1, it is characterized in that: the ADC ALT-CH alternate channel in the described ARM9 master controller is 8 tunnel 10 ALT-CH alternate channels.