CN103376142A - Single chip microcomputer based weighing type liquid level meter - Google Patents
Single chip microcomputer based weighing type liquid level meter Download PDFInfo
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- CN103376142A CN103376142A CN 201210150731 CN201210150731A CN103376142A CN 103376142 A CN103376142 A CN 103376142A CN 201210150731 CN201210150731 CN 201210150731 CN 201210150731 A CN201210150731 A CN 201210150731A CN 103376142 A CN103376142 A CN 103376142A
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- liquid level
- chip microcomputer
- level meter
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Abstract
The invention belongs to an improved liquid level meter structure, and provides a single chip microcomputer based weighing type liquid level meter which is accurate and sensitive in measurement and control and convenient to mount and use. The single chip microcomputer based weighing type liquid level meter comprises a single chip microcomputer, an input module, an output module, a power module and a communication module, and is structurally characterized by comprising a liquid level sensor, a digital to analog conversion device and a keypad, the digital to analog conversion device and the keypad are both connected with the single chip microcomputer, the liquid level sensor is connected with the digital to analog conversion device, and the output module comprises a liquid crystal display circuit, an electromagnetic control circuit and an audible and visual alarm circuit which are all connected with the single chip microcomputer.
Description
Technical field
The invention belongs to the improvement of liquid level gauge structure.
Background technology
Liquid level gauge is a kind of (having referred to adopt the instrument and meter of microprocessor) that belongs to intelligent instrumentation, and its development starts from the seventies.It is to measure and the "smart" products that are controlled in one a kind of the collection, is applicable to the level gauging of various media in the industries such as petrochemical complex, metallurgy, electric power, pharmacy, environmental protection.
But the liquid level gauge that uses now is Shortcomings also: the weight that can not measure liquid in container in the situation of the liquid level position in can measuring vessel.
In flow container, the detection of liquid weight P can directly utilize and calculate, and namely (H is liquid height CM to P=H*S* ρ; S is area of a circle M
2ρ is liquid specific gravity); So by original liquid level gauge is improved, can be by the position of measuring liquid level and then the weight that obtains liquid in container.
Summary of the invention
The present invention is exactly for the problems referred to above, provides a kind of measurement and precise control sensitive, SCM Based Weighing type liquid level meter easy to install.
For above-mentioned purpose, the present invention is achieved in that
The present invention includes single-chip microcomputer, load module, output module, power module and communication module, its structural feature load module comprises liquid level sensor, digiverter and keyboard, digiverter links to each other with single-chip microcomputer respectively with keyboard, and liquid level sensor links to each other with digiverter; Output module comprises liquid crystal display circuit, solenoid valve control circuit and sound light alarming circuit, and liquid crystal display circuit, solenoid valve control circuit all links to each other with single-chip microcomputer with sound light alarming circuit.
Beneficial effect of the present invention:
The present invention measures mainly for liquid in the tank body and can calculate the liquid level that its weight can be widely used in measuring water, oil, acids, drinks, beverage etc.Can according to up and down two limit liquid levels of setting, automatically control feed liquor and discharge opeing, and can pass through many networkings of communication module.Stable and reliable working performance of the present invention, volume is little, measures and the precise control sensitivity, and is easy to install, low in energy consumption.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Embodiment
The present invention includes single-chip microcomputer, load module, output module, power module and communication module, load module comprises liquid level sensor, digiverter and keyboard, digiverter links to each other with single-chip microcomputer respectively with keyboard, and liquid level sensor links to each other with digiverter; Output module comprises liquid crystal display circuit, solenoid valve control circuit and sound light alarming circuit, and liquid crystal display circuit, solenoid valve control circuit all links to each other with single-chip microcomputer with sound light alarming circuit.
Owing to relatively adopt the interface circuit of ultrasonic sensor to want simple to the pressure sensor interface circuit, therefore described liquid level sensor adopts pressure sensor.
Described single-chip microcomputer adopts the MSP430 single-chip microcomputer, and the MSP430 single-chip microcomputer is 16 single-chip microcomputers of low-power consumption, integrated a large amount of peripheral hardwares.Especially its inner integrated baud rate micro actuator, can make MCU when being not less than lower work of any crystal oscillator of 32768HZ (but can not surpass the upper limit that MCU requires crystal oscillator), the selection of its communication baud rate can not be subjected to the baud rate factor can not be with the restriction of decimal, can use the crystal oscillator of optional frequency in the allowed band of baud rate that is:; In addition, because the inner integrated temperature sensor of MSP430MCU can be realized very easily to surveying the temperature compensation of the used pressure transducer of liquid level; And the MSP430 series monolithic is comprised of various module for different application, and it is available battery operated that these microcontrollers are designed to, and can use for a long time.
Because the execution unit of system is solenoid valve, easily produce electromagnetic interference (EMI), so system must have higher anti-interference.
Consider that pressure signal is a tempolabile signal, generally need not quick sampling, for making system have higher anti-interference, according to analyzing contrast, selection employing V/F transducer is realized the processing to pressure signal, computing is simpler, also can reach request for utilization aspect measuring accuracy, and is easy to accomplish real-time control.The output signal of V/F change-over circuit is connected to single-chip microcomputer as interrupt request singal.
The V/F conversion is to utilize the charge balance concept of integrating capacitor to realize the electric voltage frequency conversion, so this mode good stability, and resolution is high, and signal wire is few, be convenient to realize that photoelectricity isolates to improve the anti-interference of system, but slewing rate is relatively slow.
The power module of system produce 3.3V ,+5V and-5V voltage, be respectively host computer system and sensor interface circuitry stable operating voltage be provided.
Solenoid valve control circuit receives the control signal of single-chip microcomputer, control feed liquor, liquid outlet electromagnetic valve.
Communication module is connected with slave via telecommunication circuit, is used for carrying out the serial communication between main website, the slave station.
Sound light alarming circuit is comprised of triode, light emitting diode, resistance, electric capacity, hummer etc., when the level value that measures surpasses the warning value that sets, single-chip microcomputer sends alerting signal, light emitting diode OUT is lit after receiving alerting signal, hummer sounds, and produces sound and light alarm.
The present invention carries out the data acquisition of fluid pressure by pressure transducer, carries out the demarcation of liquid level and liquid weight through the V/F modular converter, realizes high-precision measurement.When the level value in the container had surpassed setting value or warning value, system automatically started warning circuit and carries out the acousto-optic hint warning.The user can be by upper limit value and lower limit value and the parameters such as feed liquor, liquid outlet quantity of keyboard to set up liquid level, and liquid level keeps the level value of setting in the container in order to make.System can demonstrate the state of current liquid weight and feed liquor in the liquid level upper lower limit value, container of current level value, setting, fluid valve etc.
System carries out the data-signal collection by pressure transducer, and the signal that collects carries out signal through operational amplifier and amplifies.Signal after the amplification is sent into V/F and is carried out the voltage-frequency conversion, the frequency signal of its output is connected to single-chip microcomputer as interrupt request singal, after by single-chip microcomputer it being processed, convert thereof into level value, and control corresponding solenoid valve according to liquid level setting value and upper limit value and lower limit value, make that liquid level and setting value are consistent in the container.For ease of debugging and the observation of circuit, each solenoid valve is provided with working station indicator, shows that current is that liquid valve or liquid feed valve are worked.
Claims (4)
1. SCM Based Weighing type liquid level meter, comprise single-chip microcomputer, load module, output module, power module and communication module, it is characterized in that load module comprises liquid level sensor, digiverter and keyboard, digiverter links to each other with single-chip microcomputer respectively with keyboard, and liquid level sensor links to each other with digiverter; Output module comprises liquid crystal display circuit, solenoid valve control circuit and sound light alarming circuit, and liquid crystal display circuit, solenoid valve control circuit all links to each other with single-chip microcomputer with sound light alarming circuit.
2. a kind of SCM Based Weighing type liquid level meter according to claim 1 is characterized in that described single-chip microcomputer adopts the MSP430 single-chip microcomputer.
3. a kind of SCM Based Weighing type liquid level meter according to claim 1 is characterized in that digiverter adopts the V/F transducer.
4. a kind of SCM Based Weighing type liquid level meter according to claim 1 is characterized in that sound light alarming circuit is comprised of triode, light emitting diode, resistance, electric capacity, hummer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210150731 CN103376142A (en) | 2012-04-29 | 2012-04-29 | Single chip microcomputer based weighing type liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210150731 CN103376142A (en) | 2012-04-29 | 2012-04-29 | Single chip microcomputer based weighing type liquid level meter |
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| CN103376142A true CN103376142A (en) | 2013-10-30 |
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| CN 201210150731 Pending CN103376142A (en) | 2012-04-29 | 2012-04-29 | Single chip microcomputer based weighing type liquid level meter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103970158A (en) * | 2014-05-17 | 2014-08-06 | 浙江工贸职业技术学院 | Automatic liquid level control device |
| CN104142696A (en) * | 2014-07-13 | 2014-11-12 | 季文林 | Weighing water distribution control system |
| CN104340556A (en) * | 2014-10-29 | 2015-02-11 | 中国石油集团西部钻探工程有限公司 | Liquid level measuring device for liquid storage measuring tank |
| CN104391515A (en) * | 2014-12-02 | 2015-03-04 | 佛山市南海北沙制药有限公司 | Methyl alcohol storage tank feed and output control device applied to medicine production |
| CN105222850A (en) * | 2015-10-18 | 2016-01-06 | 内蒙古科技大学 | Based on the liquid level non-contact measurement system of LabVIEW |
| CN105597180A (en) * | 2015-12-14 | 2016-05-25 | 苏州登顶医疗科技有限公司 | Coloclysis instrument with liquid level displaying and liquid level ultralimit alarming functions |
| CN107702762A (en) * | 2017-09-04 | 2018-02-16 | 广东能达高等级公路维护有限公司 | The device and measuring method of analogue measurement bituminous mixing plant hot aggregate bin controlling level |
-
2012
- 2012-04-29 CN CN 201210150731 patent/CN103376142A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103970158A (en) * | 2014-05-17 | 2014-08-06 | 浙江工贸职业技术学院 | Automatic liquid level control device |
| CN104142696A (en) * | 2014-07-13 | 2014-11-12 | 季文林 | Weighing water distribution control system |
| CN104340556A (en) * | 2014-10-29 | 2015-02-11 | 中国石油集团西部钻探工程有限公司 | Liquid level measuring device for liquid storage measuring tank |
| CN104391515A (en) * | 2014-12-02 | 2015-03-04 | 佛山市南海北沙制药有限公司 | Methyl alcohol storage tank feed and output control device applied to medicine production |
| CN105222850A (en) * | 2015-10-18 | 2016-01-06 | 内蒙古科技大学 | Based on the liquid level non-contact measurement system of LabVIEW |
| CN105597180A (en) * | 2015-12-14 | 2016-05-25 | 苏州登顶医疗科技有限公司 | Coloclysis instrument with liquid level displaying and liquid level ultralimit alarming functions |
| CN107702762A (en) * | 2017-09-04 | 2018-02-16 | 广东能达高等级公路维护有限公司 | The device and measuring method of analogue measurement bituminous mixing plant hot aggregate bin controlling level |
| CN107702762B (en) * | 2017-09-04 | 2019-02-15 | 广东能达高等级公路维护有限公司 | The device and measurement method of analogue measurement bituminous mixing plant hot aggregate bin controlling level |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131030 |