CN205156998U - Water level detection circuit - Google Patents
Water level detection circuit Download PDFInfo
- Publication number
- CN205156998U CN205156998U CN201520925072.7U CN201520925072U CN205156998U CN 205156998 U CN205156998 U CN 205156998U CN 201520925072 U CN201520925072 U CN 201520925072U CN 205156998 U CN205156998 U CN 205156998U
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- Prior art keywords
- resistance
- metal probe
- water
- mouth
- water level
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Abstract
The utility model discloses a water level detection circuit, wherein, include: the singlechip, metal probe J1, metal probe J2, resistance R1, resistance R2, resistance R3, resistance R4 and water receptacle, the singlechip is equipped with P1 mouth and P2 mouth, P1 mouth one end is connected with resistance R1 and resistance R3 respectively, singlechip positive VCC is connected to the resistance R1 other end, resistance R3 connects metal probe J2, P2 mouth one end is resistance R2 and the connection of resistance R4 respectively, singlechip positive VCC is connected to the resistance R2 other end, resistance R4 connects metal probe J1, just metal probe J1, J2 are fixed in in the water receptacle. The utility model discloses make detection of water level reliablely and stablely work for a long time, circuit structure is simple in addition, and the cost is cheap relatively, also is fit for the detection of water level of various environment.
Description
Technical field
The utility model relates to water level detecting field, especially, relates to a kind of water level detection circuit.
Background technology
Along with Household electric appliance intelligent development, increasing household electrical appliance need to use automatically to identify water position status.As humidifier lack of water, reminding user adds water.
In prior art, majority utilizes tongue tube, and the capacitive character of water and the resistive of water carry out water level detecting, and utilizing tongue tube to detect installation needs to take more space.
And utilize the capacitive detection water level of water, avoid and directly contact with water, but require higher to installation site.
Utilize the resistive sensed water level of water, many employings low-voltage direct electro-detection, detection architecture is simple, easy for installation, but the brine electrolysis reaction that long-time logical direct current can cause between two metal probes, cause metal probe surface to produce metal oxide, make the contact resistance of metal and water become very large, then affect water level detecting result and water pollution.
Utility model content
The utility model object is to provide a kind of water level detection circuit, utilizes tongue tube to solve in prior art, and the capacitive character of water and resistive carry out water level detecting, and installation requirement is too high, the problem such as inaccurate and pollution of water level detecting.
For achieving the above object, the utility model provides a kind of water level detection circuit, wherein, comprise: single-chip microcomputer, metal probe J1, metal probe J2, resistance R1, resistance R2, resistance R3, resistance R4 and water receptacle, described single-chip microcomputer is provided with P1 mouth and P2 mouth, described P1 mouth one end is connected with resistance R1 and resistance R3 respectively, the described resistance R1 other end connects microcontroller power supply positive pole VCC, described resistance R3 connection metal probe J2, described P2 mouth one end respectively resistance R2 is connected with resistance R4, the described resistance R2 other end connects microcontroller power supply positive pole VCC, described resistance R4 connection metal probe J1, and described metal probe J1, J2 is fixed in water receptacle.
Further, the utility model provides a kind of water level detection circuit, and wherein, the resistance of described resistance R1 and described resistance R2 is greater than the resistance sum of the resistance of water in resistance R3, resistance R4 and water receptacle.
The utility model has following beneficial effect: the utility model provides a kind of water level detection circuit, it passes through analog AC electrical signal detection water level between metal probe J1 and metal probe J2, to solve the brine electrolysis reaction because long-time direct current causes, metal probe surface is caused to produce metal oxide, the contact resistance of metal and water is made to become very large, then water level detecting result and water pollution is affected, use this circuit to overcome the above problems, water level detecting can long-time stable reliably be worked.Circuit structure is simple in addition, relative inexpensiveness, is also applicable to the water level detecting of various environment.
Accompanying drawing explanation
Below with reference to figure, the utility model is described in further detail.The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the utility model circuit theory schematic diagram; And
Fig. 2 is the schematic diagram of the voltage condition between metal probe J1 of the present utility model and metal probe J2 when there being water.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Refer to Fig. 1 and Fig. 2, preferred embodiment of the present utility model provides a kind of water level detection circuit, wherein, comprise: single-chip microcomputer 101, metal probe J1, metal probe J2, resistance R1, resistance R2, resistance R3, resistance R4 and water receptacle 102, described single-chip microcomputer 101 is provided with P1 mouth and P2 mouth, described P1 mouth one end is connected with resistance R1 and resistance R3 respectively, the described resistance R1 other end connects microcontroller power supply positive pole VCC, described resistance R3 connection metal probe J2, described P2 mouth one end respectively resistance R2 is connected with resistance R4, the described resistance R2 other end connects microcontroller power supply positive pole VCC, described resistance R4 connection metal probe J1, and described metal probe J1, J2 is fixed in water receptacle 102.
Again, the resistance of described resistance R1 and described resistance R2 is greater than the resistance sum of the resistance of water in resistance R3, resistance R4 and water receptacle 102, described resistance R3 and described resistance R4 is respectively used to the input and output electric current limiting described P1 mouth and described P2 mouth, gets hundreds of ohm and just can meet need of work.And the resistance of real-life tap water and bottled water is all between a few K ohm to hundreds of K ohm, so the resistance of described resistance R1 and described resistance R2 gets millions of ohm just can meet work requirements.
When P1 mouth is output state, output low level, P2 mouth is input state, if have water between metal probe J1 and metal probe J2, in described resistance R2 and resistance R3, resistance R4 and water receptacle 102, the resistance of water carries out dividing potential drop, because the resistance of described resistance R2 will be far longer than resistance R3, resistance three resistance sums of resistance R4 and water, so P2 mouth can detect low level.If do not have water between metal probe J1 and metal probe J2, open a way between metal probe J1 and metal probe, due to the effect of described resistance R2 pull-up, so P2 mouth detects high level.
When P2 mouth is output state, output low level, P1 mouth is input state, if have water between metal probe J1 and metal probe J2, described resistance R1 and resistance R3, the resistance of resistance R4 and water carries out dividing potential drop, because the resistance of described resistance R1 will be far longer than resistance R3, resistance three resistance sums of resistance R4 and water, so P1 mouth can detect low level.If do not have water between metal probe J1 and metal probe J2, open a way between metal probe J1 and metal probe, due to the effect of described resistance R1 pull-up, P1 mouth detects high level.
If what detect above-mentioned is all low level, then judge there is water between metal probe J1 and metal probe J2.
Above-mentioned steps is that a water level judges, then circulate above-mentioned steps, thus realize judging whether have water between metal probe J1 and metal probe J2 always.
When P1 mouth is output state, output low level, P2 mouth is input state.When P2 mouth is output state, output low level, P1 mouth is input state, by the duty of such rotation P1 mouth and P2 mouth, when making there is water between metal probe J1 and metal probe J2, by analog AC electric signal between metal probe J1 and metal probe J2, see Fig. 2, then by ac signal sensed water level.
As can be seen from the above description, the utility model the above embodiments achieve following technique effect:
By analog AC electrical signal detection water level between metal probe J1 and metal probe J2, to solve the brine electrolysis reaction because long-time direct current causes, metal probe surface is caused to produce metal oxide, the contact resistance of metal and water is made to become very large, then water level detecting result and water pollution is affected, use this circuit to overcome the above problems, water level detecting can long-time stable reliably be worked.Circuit structure is simple in addition, relative inexpensiveness, is also applicable to the water level detecting of various environment.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model; For a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (2)
1. a water level detection circuit, it is characterized in that, comprise: single-chip microcomputer, metal probe J1, metal probe J2, resistance R1, resistance R2, resistance R3, resistance R4 and water receptacle, described single-chip microcomputer is provided with P1 mouth and P2 mouth, described P1 mouth one end is connected with resistance R1 and resistance R3 respectively, the described resistance R1 other end connects microcontroller power supply positive pole VCC, described resistance R3 connection metal probe J2, described P2 mouth one end respectively resistance R2 is connected with resistance R4, the described resistance R2 other end connects microcontroller power supply positive pole VCC, described resistance R4 connection metal probe J1, and described metal probe J1, J2 is fixed in water receptacle.
2. water level detection circuit according to claim 1, is characterized in that: the resistance of described resistance R1 and described resistance R2 is greater than the resistance sum of the resistance of water in resistance R3, resistance R4 and water receptacle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520925072.7U CN205156998U (en) | 2015-11-18 | 2015-11-18 | Water level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520925072.7U CN205156998U (en) | 2015-11-18 | 2015-11-18 | Water level detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205156998U true CN205156998U (en) | 2016-04-13 |
Family
ID=55692681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520925072.7U Expired - Fee Related CN205156998U (en) | 2015-11-18 | 2015-11-18 | Water level detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205156998U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241521A (en) * | 2015-11-18 | 2016-01-13 | 珠海市声驰电器有限公司 | Water level detection circuit |
-
2015
- 2015-11-18 CN CN201520925072.7U patent/CN205156998U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241521A (en) * | 2015-11-18 | 2016-01-13 | 珠海市声驰电器有限公司 | Water level detection circuit |
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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 |
Granted publication date: 20160413 Termination date: 20181118 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |