CN103134566A - Water level detecting circuit based on capacitance principle - Google Patents
Water level detecting circuit based on capacitance principle Download PDFInfo
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- CN103134566A CN103134566A CN 201110388759 CN201110388759A CN103134566A CN 103134566 A CN103134566 A CN 103134566A CN 201110388759 CN201110388759 CN 201110388759 CN 201110388759 A CN201110388759 A CN 201110388759A CN 103134566 A CN103134566 A CN 103134566A
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Abstract
The invention relates to a water level detecting circuit based on a capacitance principle, in particular to a water level detecting circuit used for a vehicle-mounted water dispenser water heating tank. The water level detecting circuit comprises a low water level probe, a middle water level probe, a high water level probe and a wire. The low water level probe, the middle water level probe and the high water level probe are installed on the water dispenser water heating tank in sequence. A power interface is connected to a direct current 5-voltage power source. The water level detecting circuit further comprises a circuit board provided with a PIC16F1933 singlechip, wherein the circuit board is connected with the low water level probe, the middle water level probe and the high water level probe through the wire with the fixed length. A capacitive sensor module arranged on the PIC16F1933 singlechip serves as a water level detector based on the capacitance principle to replace a water level sensor based on a mechanical principle or a water level detecting circuit based on a resistance principle so that space occupied by the senor is reduced, accuracy and reliability of water level detection are ensured, and a valid water level detection signal is provided for normal work of a vehicle-mounted water dispenser.
Description
Technical field
The present invention relates to a kind of water level detection circuit based on capacitance principle, particularly a kind of by adopting capacitive sensor modules that PIC16F1933 single-chip microcomputer inside carries to realize circuit to the water level detecting of Vehicular water dispenser heating water tank.
Background technology
Along with the development of technology, particularly use more and more to the technology of water level detecting in the Vehicular water dispenser field in field of water fountain.Condensate tank of dehumidifier commonly used has certain requirement based on the water level detecting instrument correspondence of mechanical principle with the space as water level detecting ball float, tongue tube condensate tank of dehumidifier etc.; Water level detection circuit based on resistance principle has higher requirement to the conductance of detected water quality.And the condensate tank of dehumidifier of Vehicular water dispenser heating water tank wants the characteristics that cube is little, detection water quality haves a wide reach, detection sensitivity is high to propose higher requirement to condensate tank of dehumidifier or circuit.
Summary of the invention
The objective of the invention is in order to overcome existing Vehicular water dispenser heating water tank based on the deficiency of the water level detection circuit of resistance principle, invent and a kind ofly realize water level detection circuit based on capacitance principle by the capacitive sensor modules that carries with the PIC single-chip microcomputer.
Water level detection circuit based on capacitance principle of the present invention, comprise low-level probe, middle water level probe and high-level probe, described low-level probe, middle water level probe and high-level probe are arranged on the drinking machine heating water tank in order, power interface is connected on direct supply, it is characterized in that: also comprise one with the circuit board of single-chip microcomputer, this circuit board is connected with high-level probe with described low-level probe, middle water level probe respectively by wire.
Water level detection circuit based on capacitance principle of the present invention, the voltage of described direct supply are 5V.
Water level detection circuit based on capacitance principle of the present invention, the model of described single-chip microcomputer are PIC16F1933.
Water level detection circuit based on capacitance principle of the present invention, described PIC16F1933 single-chip microcomputer realizes that as level detection sensor dynamic water table detects.
Water level detection circuit based on capacitance principle of the present invention, under normality, low-level probe, middle water level probe and high-level probe are in vacant state, the capacitive sensor modules output pulse frequency of PIC16F1933 single-chip microcomputer is constant, and its value is greater than the threshold value of water level judgement, software judgement low-level probe, middle water level probe and high-level probe are without the water level signal, and the water level signal output interface is with the output low level signal;
When the drinking machine heating water tank is added water, water level needle will change the concussion capacitance of single-chip microcomputer capacitive sensor modules immediately after touching water, single-chip microcomputer capacitive sensor modules output pulse frequency is diminished, software has been judged as water level signal, and the water level signal output interface will be exported high level signal;
When the water tank topped up with water, low-level probe, middle water level probe and high-level probe all detect water level signal, and the water level signal that the water level signal output interface is corresponding all will be exported high level signal.
Compared with prior art, beneficial effect of the present invention is: by adopting single-chip microcomputer as level detection sensor, utilize its programmable function, write the dynamic software algorithm, realize that dynamic water table detects.So just than adopt the fixedly water level detection circuit practicality of comparative voltage based on resistance principle, realized the accurate detection to low conductivity water quality water levels such as pure water, distilled water, lower mineral water, frozen water.
Description of drawings
Fig. 1 is the circuit diagram that the present invention is based on the water level detection circuit of capacitance principle;
Fig. 2 is the circuit theory diagrams that the present invention is based on the water level detection circuit of capacitance principle.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, a kind of water level detection circuit based on capacitance principle, comprise low-level probe 1, middle water level probe 2, high-level probe 3, wire 4, in low, Senior Three position water level probe is arranged on drinking machine heating water tank 6 in order, power interface 7 is connected on direct current 5V power supply, comprises that also one is connected with low middle Senior Three position water level probe by regular length wire 4 with the circuit board 5 of PIC16F1933 single-chip microcomputer.
Under normality, the drinking machine heating water tank is anhydrous, in low, Senior Three position water level probe is in vacant state, the capacitive sensor modules output pulse frequency of PIC16F1933 single-chip microcomputer is constant, and its value is greater than the threshold value of water level judgement, during the software judgement is low, the high water stage pin is without the water level signal, and water level signal output interface 8 is with the output low level signal.When the drinking machine heating water tank is added water, water level needle will change the concussion capacitance of single-chip microcomputer capacitive sensor modules immediately after touching water, thereby single-chip microcomputer capacitive sensor modules output pulse frequency is diminished, software has been judged as water level signal, and water level signal output interface 8 will be exported high level signal.When the water tank topped up with water, three water level needles all detect water level signal, and the water level signal of water level signal output interface 8 correspondences all will be exported high level signal.
In the time of water dispenser water outlet outward, high, normal, basic three water level probes will not reach water successively, recover vacant state, the capacitive sensor modules output pulse frequency of single-chip microcomputer will become greater to the vacant state value, this moment, software was judged as anhydrous state, and water level signal output interface 8 will recover low level signal.After water in water tank was drained, three water level needles were all with anhydrous state, and the water level signal of water level signal output interface 8 correspondences is all with the output low level signal.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (5)
1. water level detection circuit based on capacitance principle, comprise low-level probe, middle water level probe and high-level probe, described low-level probe, middle water level probe and high-level probe are arranged on the drinking machine heating water tank in order, power interface is connected on direct supply, it is characterized in that: also comprise one with the circuit board of single-chip microcomputer, this circuit board is connected with high-level probe with described low-level probe, middle water level probe respectively by wire.
2. the water level detection circuit based on capacitance principle according to claim 1, it is characterized in that: the voltage of described direct supply is 5V.
3. the water level detection circuit based on capacitance principle according to claim 1, it is characterized in that: the model of described single-chip microcomputer is PIC16F1933.
4. the water level detection circuit based on capacitance principle according to claim 1 is characterized in that: described PIC16F1933 single-chip microcomputer realizes that as level detection sensor dynamic water table detects.
5. the water level detection circuit based on capacitance principle according to claim 1, it is characterized in that: under normality, low-level probe, middle water level probe and high-level probe are in vacant state, the capacitive sensor modules output pulse frequency of PIC16F1933 single-chip microcomputer is constant, and its value is greater than the threshold value of water level judgement, software judgement low-level probe, middle water level probe and high-level probe are without the water level signal, and the water level signal output interface is with the output low level signal;
When the drinking machine heating water tank is added water, water level needle will change the concussion capacitance of single-chip microcomputer capacitive sensor modules immediately after touching water, single-chip microcomputer capacitive sensor modules output pulse frequency is diminished, software has been judged as water level signal, and the water level signal output interface will be exported high level signal;
During the water tank topped up with water, low-level probe, middle water level probe and high-level probe all detect water level signal, and the water level signal that the water level signal output interface is corresponding all will be exported high level signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388759 CN103134566A (en) | 2011-11-30 | 2011-11-30 | Water level detecting circuit based on capacitance principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110388759 CN103134566A (en) | 2011-11-30 | 2011-11-30 | Water level detecting circuit based on capacitance principle |
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| CN103134566A true CN103134566A (en) | 2013-06-05 |
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| CN 201110388759 Pending CN103134566A (en) | 2011-11-30 | 2011-11-30 | Water level detecting circuit based on capacitance principle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292862A (en) * | 2012-02-24 | 2013-09-11 | 罗红光 | Water level detection circuit based on capacitance principle |
| CN103752441A (en) * | 2013-12-28 | 2014-04-30 | 北京昊华能源股份有限公司 | Automatic water adding device for spray pump |
| CN104266712A (en) * | 2014-09-29 | 2015-01-07 | 深圳市爱普特微电子有限公司 | Liquid height measurement method and device based on capacitive sensor |
| CN107203226A (en) * | 2017-06-20 | 2017-09-26 | 熊佳富 | A kind of three ring solid-states probe detected to city piping lane catch pit water level |
| CN113027784A (en) * | 2021-03-31 | 2021-06-25 | 浙江大元泵业股份有限公司 | Water shortage detection control method for submersible pump |
-
2011
- 2011-11-30 CN CN 201110388759 patent/CN103134566A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292862A (en) * | 2012-02-24 | 2013-09-11 | 罗红光 | Water level detection circuit based on capacitance principle |
| CN103752441A (en) * | 2013-12-28 | 2014-04-30 | 北京昊华能源股份有限公司 | Automatic water adding device for spray pump |
| CN104266712A (en) * | 2014-09-29 | 2015-01-07 | 深圳市爱普特微电子有限公司 | Liquid height measurement method and device based on capacitive sensor |
| CN107203226A (en) * | 2017-06-20 | 2017-09-26 | 熊佳富 | A kind of three ring solid-states probe detected to city piping lane catch pit water level |
| CN107203226B (en) * | 2017-06-20 | 2023-08-11 | 熊佳富 | Three-ring solid-state probe for detecting water level of urban pipe gallery sump |
| CN113027784A (en) * | 2021-03-31 | 2021-06-25 | 浙江大元泵业股份有限公司 | Water shortage detection control method for submersible pump |
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Application publication date: 20130605 |