CN202533144U - Gravimetric liquid level meter system based on mixed signal processor (MSP) 430 single chip microcomputer (SCM) - Google Patents

Gravimetric liquid level meter system based on mixed signal processor (MSP) 430 single chip microcomputer (SCM) Download PDF

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Publication number
CN202533144U
CN202533144U CN201220211447XU CN201220211447U CN202533144U CN 202533144 U CN202533144 U CN 202533144U CN 201220211447X U CN201220211447X U CN 201220211447XU CN 201220211447 U CN201220211447 U CN 201220211447U CN 202533144 U CN202533144 U CN 202533144U
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CN
China
Prior art keywords
liquid level
chip
circuit
chip microcomputer
msp430
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Expired - Fee Related
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CN201220211447XU
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Chinese (zh)
Inventor
林锋
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Sichuan Youdi Science & Technology Co Ltd
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Sichuan Youdi Science & Technology Co Ltd
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Priority to CN201220211447XU priority Critical patent/CN202533144U/en
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Expired - Fee Related legal-status Critical Current
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Abstract

The utility model discloses a gravimetric liquid level meter system based on a mixed signal processor (MSP) 430 single chip microcomputer (SCM). The gravimetric liquid level meter system based on the MSP430 SCM mainly comprises an MSP430F1222 chip, an information acquisition switching circuit, a control driving circuit and a power source system, wherein the information acquisition switching circuit and the control driving circuit are connected with the MSP430F1222 chip. The gravimetric liquid level meter system based on the MSP430 SCM has the advantages of being capable of independently measuring and calculating the weight.

Description

Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer
Technical field
The utility model relates to level gauging control, specifically is meant the Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer.
Background technology
The liquid level controlling appearance 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.This instrument is primarily aimed in the tank body liquid and measures and can calculate its weight, is applicable to various fluent meterials are carried out static state and kinetic measurement and monitoring, and have overload alarm and MS master-slave station pattern network savvy.
The utility model content
The purpose of the utility model is to provide a kind of Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer that can measure and can calculate its weight.
The implementation of the utility model is following: based on the Weighing type liquid level instrument system of MSP430 single-chip microcomputer, mainly by the MSP430F1222 chip, and the information acquisition change-over circuit that is connected with the MSP430F1222 chip and control Driver Circuit, power-supply system constitute.
The V/F change-over circuit that said information acquisition change-over circuit comprises sensor and is connected with sensor, said V/F change-over circuit is connected with the MSP430F1222 chip.
Said sensor be pressure transducer or with ultrasonic sensor or with the float-type sensing.
Said control Driver Circuit comprises solenoid valve and the control circuit that is connected with solenoid valve, and said control circuit is connected with the MSP430F1222 chip.
Said MSP430F1222 chip also is connected with sound and light alarm, keyboard, liquid crystal drive interface, telecommunication circuit; Said liquid crystal drive interface is connected with LCD; Said telecommunication circuit is connected with slave.
The sensor that in level gauging, is adopted generally speaking has: pressure transducer, ultrasonic sensor, float-type transmitter etc., owing to require in measuring liquid level, also will realize the detection of liquid weight in the system design.In flow container, the detection of liquid weight P can directly utilize and calculate, and promptly (H is liquid height CM to P=H*S* ρ; S is area of a circle M2; ρ is a liquid specific gravity), therefore have only the resolution that improves the liquid level test could guarantee the precision of liquid weight test, the liquid level measuring resolution is 1cm in the native system.In addition, consider that the pressure sensor interface circuit adopts the interface circuit of ultrasonic sensor to want simple relatively, therefore confirms adopts pressure sensor.
The MSP430F1222 chip is 16 single-chip microcomputers of low-power consumption, has typical SOC characteristics, integrated a large amount of peripheral hardwares.Especially its inner integrated baud rate micro actuator; Can make the MSP430F1222 chip be not less than any crystal oscillator of 32768HZ (but can not surpass the upper limit that the MSP430F1222 chip requires crystal oscillator) when working down; The selection of its communication baud rate can not receive the baud rate factor can not have the restriction of decimal, in the allowed band of baud rate, can use the crystal oscillator of optional frequency that is:.In addition and since the MSP430F1222 chip internal integrated temperature sensor, can realize very easily surveying the used temperature Compensation of Pressure Sensor of liquid level.And the MSP430F1222 chip pins is made up of various module 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 a solenoid valve, be prone to produce electromagnetic interference (EMI), therefore for can reliable work making system have higher anti-interference.
A kind of method is directly to utilize the A/D converter of MSP430F1222 chip internal, is characterized in: need not peripheral circuit, and sample rate is fast, but antijamming capability is relatively poor.
Another kind method is to use the V/F change-over circuit to realize the A/D conversion.Owing to the V/F conversion is to utilize the charge balance concept of integrating capacitor to realize the electric voltage frequency conversion, thus this mode good stability, resolution is high, and signal wire is few, be convenient to realize the anti-interference of photoelectricity isolation with the raising system, but slewing rate is relatively slow.
Consider that pressure signal is a tempolabile signal; Generally need not quick sampling, have higher anti-interference for making system, according to analyzing contrast; Select to adopt the V/F change-over circuit to realize processing to pressure signal; Computing is simpler, aspect measuring accuracy, also can reach request for utilization, and is easy to accomplish real-time control.
Native system carries out the data acquisition of fluid pressure through pressure transducer, and process/F change-over circuit carries out the demarcation of liquid level and liquid weight, realizes high-precision measurement.When the level value in the container had surpassed setting value or warning value, system started warning circuit automatically and carries out the acousto-optic hint warning.The user can be through the 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 so that make.System adopts the large-screen lc Chinese character to show, 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.
The advantage of the utility model is: can measure voluntarily also and can calculate its weight.
Description of drawings
Fig. 1 is the utility model one-piece construction synoptic diagram.
Embodiment
Embodiment one
As shown in Figure 1.
Based on the Weighing type liquid level instrument system of MSP430 single-chip microcomputer, mainly by the MSP430F1222 chip, and the information acquisition change-over circuit that is connected with the MSP430F1222 chip and control Driver Circuit, power-supply system constitute.
The V/F change-over circuit that said information acquisition change-over circuit comprises sensor and is connected with sensor, said V/F change-over circuit is connected with the MSP430F1222 chip.
Said sensor be pressure transducer or with ultrasonic sensor or with the float-type sensing.
Said control Driver Circuit comprises solenoid valve and the control circuit that is connected with solenoid valve, and said control circuit is connected with the MSP430F1222 chip.
Said MSP430F1222 chip also is connected with sound and light alarm, keyboard, liquid crystal drive interface, telecommunication circuit; Said liquid crystal drive interface is connected with LCD; Said telecommunication circuit is connected with slave.
The sensor that in level gauging, is adopted generally speaking has: pressure transducer, ultrasonic sensor, float-type transmitter etc., owing to require in measuring liquid level, also will realize the detection of liquid weight in the system design.In flow container, the detection of liquid weight P can directly utilize and calculate, and promptly (H is liquid height CM to P=H*S* ρ; S is area of a circle M2; ρ is a liquid specific gravity), therefore have only the resolution that improves the liquid level test could guarantee the precision of liquid weight test, the liquid level measuring resolution is 1cm in the native system.In addition, consider that the pressure sensor interface circuit adopts the interface circuit of ultrasonic sensor to want simple relatively, therefore confirms adopts pressure sensor.
Because the execution unit of system is a solenoid valve, be prone to produce electromagnetic interference (EMI), therefore for can reliable work making system have higher anti-interference.
A kind of method is directly to utilize the A/D converter of MSP430F1222 chip internal, is characterized in: need not peripheral circuit, and sample rate is fast, but antijamming capability is relatively poor.
Another kind method is to use the V/F change-over circuit to realize the A/D conversion.Owing to the V/F conversion is to utilize the charge balance concept of integrating capacitor to realize the electric voltage frequency conversion, thus this mode good stability, resolution is high, and signal wire is few, be convenient to realize the anti-interference of photoelectricity isolation with the raising system, but slewing rate is relatively slow.
Consider that pressure signal is a tempolabile signal; Generally need not quick sampling, have higher anti-interference for making system, according to analyzing contrast; Select to adopt the V/F change-over circuit to realize processing to pressure signal; Computing is simpler, aspect measuring accuracy, also can reach request for utilization, and is easy to accomplish real-time control.
Native system carries out the data acquisition of fluid pressure through pressure transducer, and process/F change-over circuit carries out the demarcation of liquid level and liquid weight, realizes high-precision measurement.When the level value in the container had surpassed setting value or warning value, system started warning circuit automatically and carries out the acousto-optic hint warning.The user can be through the 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 so that make.System adopts the large-screen lc Chinese character to show, 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.
As stated, then can well realize the utility model.

Claims (5)

1. based on the Weighing type liquid level instrument system of MSP430 single-chip microcomputer, it is characterized in that: mainly by the MSP430F1222 chip, and the information acquisition change-over circuit that is connected with the MSP430F1222 chip and control Driver Circuit, power-supply system constitute.
2. the Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer according to claim 1; It is characterized in that: the V/F change-over circuit that said information acquisition change-over circuit comprises sensor and is connected with sensor, said V/F change-over circuit is connected with the MSP430F1222 chip.
3. the Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer according to claim 2 is characterized in that: said sensor be pressure transducer or with ultrasonic sensor or with the float-type sensing.
4. the Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer according to claim 1 is characterized in that: said control Driver Circuit comprises solenoid valve and the control circuit that is connected with solenoid valve, and said control circuit is connected with the MSP430F1222 chip.
5. according to any described Weighing type liquid level instrument system based on the MSP430 single-chip microcomputer among the claim 1-4, it is characterized in that: said MSP430F1222 chip also is connected with sound and light alarm, keyboard, liquid crystal drive interface, telecommunication circuit; Said liquid crystal drive interface is connected with LCD; Said telecommunication circuit is connected with slave.
CN201220211447XU 2012-05-11 2012-05-11 Gravimetric liquid level meter system based on mixed signal processor (MSP) 430 single chip microcomputer (SCM) Expired - Fee Related CN202533144U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201220211447XU CN202533144U (en) 2012-05-11 2012-05-11 Gravimetric liquid level meter system based on mixed signal processor (MSP) 430 single chip microcomputer (SCM)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201220211447XU CN202533144U (en) 2012-05-11 2012-05-11 Gravimetric liquid level meter system based on mixed signal processor (MSP) 430 single chip microcomputer (SCM)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389138A (en) * 2012-05-11 2013-11-13 四川优的科技有限公司 Weighing type liquid level meter system based on MSP430 (Mixed Signal Processor 430) single chip microcomputer
CN103575330A (en) * 2013-10-09 2014-02-12 无锡锐泰节能系统科学有限公司 Multi-parameter ultrasonic wave fluid tester and use method thereof
CN105043515A (en) * 2015-08-12 2015-11-11 成都易思科科技有限公司 Liquid weighing sensor system designed by adopting ultra-low power dissipation module

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389138A (en) * 2012-05-11 2013-11-13 四川优的科技有限公司 Weighing type liquid level meter system based on MSP430 (Mixed Signal Processor 430) single chip microcomputer
CN103575330A (en) * 2013-10-09 2014-02-12 无锡锐泰节能系统科学有限公司 Multi-parameter ultrasonic wave fluid tester and use method thereof
CN105043515A (en) * 2015-08-12 2015-11-11 成都易思科科技有限公司 Liquid weighing sensor system designed by adopting ultra-low power dissipation module

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C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20121114

Termination date: 20130511