CN205068180U - Millimeter level liquid level control system based on pressure sensor - Google Patents
Millimeter level liquid level control system based on pressure sensor Download PDFInfo
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- CN205068180U CN205068180U CN201520334832.7U CN201520334832U CN205068180U CN 205068180 U CN205068180 U CN 205068180U CN 201520334832 U CN201520334832 U CN 201520334832U CN 205068180 U CN205068180 U CN 205068180U
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Abstract
The utility model discloses a millimeter level liquid level control system based on pressure sensor, include host computer operating system and the next quick -witted control system through serial communication circuit connection, host computer operating system includes host computer, keying circuit and liquid crystal display circuit, and the host computer input links to each other with the keying circuit output, and the host computer output links to each other with the liquid crystal display circuit input, the next quick -witted control system includes the singlechip, an analog to digital converter, pressure sensor, the charactron display circuit, power supply circuit, drive circuit and water pump, the microcontroller type end links to each other with AD converter output, AD converter input links to each other with the pressure sensors output end, the microcontroller type end links to each other with the output of the power supply circuit end, the singlechip output links to each other with the input of charactron display circuit, the singlechip output links to each other with the drive circuit input, the drive circuit output links to each other with the water pump input. The system provided by the utility model stability is good, the accuracy is high and with low costs.
Description
Technical field
The utility model relates to a kind of tank level control system, especially a kind of grade tank level control system based on pressure transducer.
Background technology
At present, China's domestic water or plant water supply mainly adopt water tower or water tank form, the situation of empty van/tower in order to prevent water tower or the too high and spilling water of cistern water level or water level too low, should remain within the specific limits by the water in control tower or in case.
Mostly adopt traditional water floating type tank level control system realize automatic water-supply or discharge water in prior art, but still there is shortcomings in this system: the present level one, can not monitoring water in real time; Two, ground Long-distance Control can not be realized; Three, easy weather effect, poor stability.Therefore market needs urgently the high tank level control system with low cost again of a kind of good stability, degree of accuracy.
Utility model content
The purpose of this utility model is to provide the grade tank level control system based on pressure transducer that a kind of good stability, degree of accuracy are high, cost is low.
The utility model is achieved in that a kind of grade tank level control system based on pressure transducer, and comprise host computer operating system and lower computer control system, host computer operating system is connected by serial communication circuit with lower computer control system, described host computer operating system comprises host computer, key circuit and liquid crystal display circuit, and the input end of described host computer is connected with the output terminal of key circuit, and the output terminal of described host computer is connected with the input end of liquid crystal display circuit, described lower computer control system comprises single-chip microcomputer, A/D converter, pressure transducer, digital pipe display circuit, power circuit, driving circuit and water pump, the input end of described single-chip microcomputer is connected with the output terminal of A/D converter, the input end of described A/D converter is connected with the output terminal of pressure transducer, the input end of described single-chip microcomputer is connected with the output terminal of power circuit, the output terminal of described single-chip microcomputer is connected with the input end of digital pipe display circuit, the output terminal of described single-chip microcomputer is connected with the input end of driving circuit, the output terminal of described driving circuit is connected with the input end of described water pump.
Find through experiment, when pumping for water pump or when discharging water, because the current of container bottom are relatively more anxious, can have an impact to pressure transducer and cause systematic error comparatively large, therefore also need cover a net at conduit mouth place, playing buffer action.
Described single-chip microcomputer can be AT89S52 single-chip microcomputer, and described A/D converter can be TLC2543A/D converter, and described pressure transducer can be D3B pressure transducer.
Preferably, described serial communication circuit is MAX232 chip.
Preferably, described driving circuit is L298N motor drive ic.
Preferably, described power circuit is voltage-stabilized power supply circuit.
Preferably, described lower computer control system also comprises warning circuit, and the output terminal of described single-chip microcomputer is connected with the input end of warning circuit.
Compared with prior art, the utility model has following beneficial effect: 1. adopt tank level control system of the present utility model, and finally energy control survey error range is at 0.1 ~ 1.1mm, and degree of accuracy is high; 2. the utility model achieves the control of upper and lower computer system remote by MAX232 serial communication port, ensure that the promptness of control, reduces the labour intensity of staff; 3. the utility model is by covering a net at water pump conduit mouth place, plays buffering flow action in time taking out/discharge water, and improves the stability of system.
Accompanying drawing explanation
Fig. 1 is systematic square frame schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further.
As shown in Figure 1, a kind of grade tank level control system based on pressure transducer, comprise host computer operating system 1 and lower computer control system 2, host computer operating system 1 is connected by serial communication circuit 3 with lower computer control system 2, described host computer operating system 1 comprises host computer 11, key circuit 12 and liquid crystal display circuit 13, and the input end of described host computer 11 is connected with the output terminal of key circuit 12, and the output terminal of described host computer 11 is connected with the input end of liquid crystal display circuit 13, described lower computer control system 2 comprises single-chip microcomputer 21, A/D converter 22, pressure transducer 23, digital pipe display circuit 24, power circuit 25, driving circuit 26 and water pump 27, the input end of described single-chip microcomputer 21 is connected with the output terminal of A/D converter 22, the input end of described A/D converter 22 is connected with the output terminal of pressure transducer 23, the input end of described single-chip microcomputer 21 is connected with the output terminal of power circuit 25, the output terminal of described single-chip microcomputer 21 is connected with the input end of digital pipe display circuit 24, the output terminal of described single-chip microcomputer 21 is connected with the input end of driving circuit 26, the output terminal of described driving circuit 26 is connected with the input end of described water pump 27.Described lower computer control system 2 also comprises warning circuit 28, and the output terminal of described single-chip microcomputer 21 is connected with the input end of warning circuit 28.The utility model achieves upper and lower computer system remote by MAX232 serial communication port and controls, and ensure that the promptness of control, reduces the labour intensity of staff.
Find through experiment, when water pump 27 draws water or discharges water, because the current of container bottom are relatively more anxious, can have an impact to pressure transducer 23 and cause systematic error comparatively large, therefore also need cover a net at conduit mouth place, playing buffer action.
Described single-chip microcomputer 21 can be AT89S52 single-chip microcomputer, and described A/D converter 22 can be TLC2543A/D converter, and described pressure transducer 23 can be D3B pressure transducer.
Pressure transducer 23 adopts D3B pressure transducer, and its operating voltage is 4.2V ~ 6.2V; Pressure limit is 0 ~ 1000MM water column, 0 ~ 0.1Kg/c ㎡; Voltage exports as 0.23V ~ 4.9V; The linearity is 0.2%.
A/D converter 22 adopts TLC254312 position A/D converter, general, and the A/D converter of less than 8 is classified as low resolution converter, 9 ~ 12 be classified as intermediate-resolution converter, more than 13 be classified as high resolution converters; Wherein, low resolution converter errors is comparatively large, and high resolution converters there is no much contributions to minimizing error, and but raise too high to the requirement of A/D converter, it is suitable for therefore getting 12, greatly improves measuring accuracy.
Single-chip microcomputer 21 adopts AT89S52 single-chip microcomputer, AT89S52 is a kind of low-power consumption, high performance CMOS8 8-digit microcontroller, there is the able to programme flash storage of 8K in system, software programming is flexible, degree of freedom is large, can realize various algorithm and logic control, and it also has that volume is little, precision is high, technology maturation and low cost and other advantages.
Driving circuit 26 adopts L298N motor drive ic to control water pump, because this water pump is invariablenes turning speed between 5V-12V in voltage range, therefore only need control turning to of water pump, thus contribute to the plus-minus accurately realizing water level.
Power circuit 25 is voltage-stabilized power supply circuit, and the power supply mode adopting 12V single supply to export again after two LM7805 voltage stabilizings is powered to system and water pump, effectively solves the impact caused system because water pump electric current is large.
To sum up as shown in table 1, table 2, adopt tank level control system of the present utility model that data precision will be made greatly to improve, final native system energy control survey error (error between setting value and actual value) scope is at 0.1 ~ 1.1mm.
The course of work of the present utility model: D3B pressure transducer according to variation in water pressure to TLC2543A/D converter input voltage signal, TLC2543A/D converter converts voltage signal to digital signal, and the digital signal of conversion is sent to AT89S52 single-chip microcomputer, digital signal is converted to water level value and is presented on numeral method device by AT89S52 single-chip microcomputer, display current level value h, h is sent to host computer simultaneously, host computer by h display on a liquid crystal display, operating personnel make corresponding action command to the comparison of water level settings value H by key circuit according to h, action command is sent to AT89S52 single-chip microcomputer by host computer, AT89S52 single-chip microcomputer sends the action command controlling water pump to driving circuit, driving circuit controls the action of water pump according to action command: as H>h, pumping for water pump, as H=h, water pump is static, as H<h, water pump discharges water.
Table 1 is test result when native system draws water.
Table 2 is test result when native system discharges water.
The above embodiments are only preferred embodiment of the present utility model, can not limit interest field of the present utility model with this, therefore, any amendment done according to the utility model essence, equivalent to substitute, still belong to the scope that the utility model is contained.
Claims (5)
1. based on a grade tank level control system for pressure transducer, it is characterized in that: comprise host computer operating system and lower computer control system, host computer operating system is connected by serial communication circuit with lower computer control system, described host computer operating system comprises host computer, key circuit and liquid crystal display circuit, and the input end of described host computer is connected with the output terminal of key circuit, and the output terminal of described host computer is connected with the input end of liquid crystal display circuit, described lower computer control system comprises single-chip microcomputer, A/D converter, pressure transducer, digital pipe display circuit, power circuit, driving circuit and water pump, the input end of described single-chip microcomputer is connected with the output terminal of A/D converter, the input end of described A/D converter is connected with the output terminal of pressure transducer, the input end of described single-chip microcomputer is connected with the output terminal of power circuit, the output terminal of described single-chip microcomputer is connected with the input end of digital pipe display circuit, the output terminal of described single-chip microcomputer is connected with the input end of driving circuit, the output terminal of described driving circuit is connected with the input end of described water pump.
2. a kind of grade tank level control system based on pressure transducer according to claim 1, is characterized in that: described serial communication circuit is MAX232 chip.
3. a kind of grade tank level control system based on pressure transducer according to claim 1, is characterized in that: described driving circuit is L298N motor drive ic.
4. a kind of grade tank level control system based on pressure transducer according to claim 1, is characterized in that: described power circuit is voltage-stabilized power supply circuit.
5. a kind of grade tank level control system based on pressure transducer according to claim 1, it is characterized in that: described lower computer control system also comprises warning circuit, the output terminal of described single-chip microcomputer is connected with the input end of warning circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520334832.7U CN205068180U (en) | 2015-05-21 | 2015-05-21 | Millimeter level liquid level control system based on pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520334832.7U CN205068180U (en) | 2015-05-21 | 2015-05-21 | Millimeter level liquid level control system based on pressure sensor |
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| Publication Number | Publication Date |
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| CN205068180U true CN205068180U (en) | 2016-03-02 |
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| CN201520334832.7U Expired - Fee Related CN205068180U (en) | 2015-05-21 | 2015-05-21 | Millimeter level liquid level control system based on pressure sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898715A (en) * | 2015-05-21 | 2015-09-09 | 玉林师范学院 | Millimeter-level liquid level control system based on pressure transducer |
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2015
- 2015-05-21 CN CN201520334832.7U patent/CN205068180U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104898715A (en) * | 2015-05-21 | 2015-09-09 | 玉林师范学院 | Millimeter-level liquid level control system based on pressure transducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160302 Termination date: 20180521 |