CN202382769U - Sampling circuit - Google Patents
Sampling circuit Download PDFInfo
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- CN202382769U CN202382769U CN2011205043471U CN201120504347U CN202382769U CN 202382769 U CN202382769 U CN 202382769U CN 2011205043471 U CN2011205043471 U CN 2011205043471U CN 201120504347 U CN201120504347 U CN 201120504347U CN 202382769 U CN202382769 U CN 202382769U
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- resistance
- sampling element
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Abstract
The utility model discloses a sampling circuit, comprising a first sampling element, a second sampling element, a first resistor, a second resistor, a third resistor and a capacitor; one end of the first sampling element is connected with a power supply, the other end is connected with one end of the first resistor, the other end of the first resistor is grounded; a common end of the first sampling element and the first resistor is respectively connected with an I/O interface of an external control unit and one end of the second resistor, the other end of the second resistor is connected with one end of the capacitor, the other end of the capacitor is respectively connected with one end of the second sampling element and one end of the third resistor, the other end of the second sampling element is grounded, the other end of the third resistor is connected with the I/O interface of the external control unit. The sampling circuit has simple structure, and only occupies less resources of I/O interface of the external control unit.
Description
Technical field:
The utility model relates to a kind of circuit, specifically is a kind of sample circuit.
Background technology:
A kind of sample circuit is arranged at present; It comprises a thermistor, a liquid level sensor, four resistance and an electrochemical capacitor, and its structure is as shown in Figure 1: thermistor one end ground connection, its other end are connected with an end of first resistance and second resistance respectively; The I/O interface of another termination external control unit of second resistance; The first resistance other end connects the I/O interface of external control unit and an end of the 3rd resistance respectively, and the positive pole of another termination electrochemical capacitor of the 3rd resistance, the negative pole of electrochemical capacitor connect an end of liquid level sensor and the 4th resistance respectively; Liquid level sensor other end ground connection, the 4th resistance other end is connected with the I/O interface of external control unit.Wherein, thermistor and liquid level sensor all belong to sampling element.This sample circuit is required take the I/O interface resource of external control unit more.
The utility model content:
The utility model technical matters to be solved is, provide a kind of simple in structure, only need take the sample circuit of the I/O interface resource of less external control unit.
The technical solution of the utility model is; A kind of sample circuit is provided; It comprises first sampling element, second sampling element, first resistance, second resistance, the 3rd resistance and electric capacity; First sampling element, one end connects power supply, and its other end is connected with an end of first resistance, the first resistance other end ground connection; The common port of said first sampling element and first resistance is connected the I/O interface of external control unit and an end of second resistance respectively; The second resistance other end connects an end of electric capacity; The said electric capacity other end is connected with an end of second sampling element and the 3rd resistance respectively; The second sampling element other end ground connection, the other end of the 3rd resistance connects the I/O interface of external control unit.
Adopt after the above structure compared with prior art, the utlity model has following advantage: circuit structure is simple, only need the I/O interface of two external control unit.
As preferably, said first sampling element is thermistor or voltage dependent resistor (VDR).Through this thermistor can be electric signal output with temperature transition, is used to measure variation of temperature; Can convert pressure into electric signal output through this voltage dependent resistor (VDR), be used to measure the pressure of liquid and gas.
As preferably, said second sampling element is liquid level sensor or humidity sensor.Can convert liquid level into electric signal output through this liquid level sensor, be used for the situation of change of measuring liquid level; Can convert humidity into electric signal output through this humidity sensor, be used for the variation of humidity measuring.
Description of drawings:
Fig. 1 is the circuit theory diagrams of existing sample circuit
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment:
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
As shown in Figure 2; A kind of sample circuit, it comprises first sampling element, second sampling element, first resistance, second resistance, the 3rd resistance and electric capacity, first sampling element, one end connects power supply; Its other end is connected with an end of first resistance, the first resistance other end ground connection; The common port of said first sampling element and first resistance is connected the I/O interface of external control unit and an end of second resistance respectively; The second resistance other end connects an end of electric capacity; The said electric capacity other end is connected with an end of second sampling element and the 3rd resistance respectively; The second sampling element other end ground connection, the other end of the 3rd resistance connects the I/O interface of external control unit.This sample circuit only needs the I/O interface of two external control unit, like this, when selecting chip, more selection can be arranged.
In the present embodiment, this sample circuit is used for solar water heater, and this sample circuit is used for gathering the temperature of water in the water heater and the height of water level.Said first resistance R, 1 resistance is 2K, and second resistance R, 2 resistances are 30K, and the 3rd resistance R 3 resistances are 2K, and electric capacity is selected electrochemical capacitor C1 for use, and its capacitance is 10 μ, and said first sampling element is thermistor RT, and said second sampling element is liquid level sensor BL.Through this thermistor RT can be electric signal output with temperature transition, and electric signal is through the I/O interface of external control unit, and the A/D converter through the external control unit is a digital signal with analog signal conversion, thereby realizes the real-time measurement of temperature.Likewise, during the monitoring water level, be high level when what receive; Power vd D gives electrochemical capacitor C1 charging; Magnitude of voltage remains unchanged in this time period, and this magnitude of voltage is transported to the A/D converter of control module, measures different water level situations through the different voltages with different value; When what receive is low level, and then power vd D does not give electrochemical capacitor C1 charging.
Certainly, also can the first sampling element thermistor be substituted with other sensitive resistances and measure different sample objects, as the first sampling element thermistor is replaced with the pressure that voltage dependent resistor (VDR) is measured liquid or gas; Same, can come corresponding different sampling elements, like pressure transducer, humidity sensor, illuminance transducer etc. through the resistance of adjustment second resistance R 2 and the capacitance of electrochemical capacitor C1; Can replace sensor with sensitive resistance in addition, this replacement does not influence its result of use yet.Resistance through changing second resistance R 2 and the capacitance of electrochemical capacitor C1 come corresponding different sampling elements, just can measure different sample objects.
Claims (3)
1. sample circuit; It comprises first sampling element, second sampling element, first resistance, second resistance, the 3rd resistance and electric capacity; It is characterized in that: first sampling element, one end connects power supply, and its other end is connected with an end of first resistance, the first resistance other end ground connection; The common port of said first sampling element and first resistance is connected the I/O interface of external control unit and an end of second resistance respectively; The second resistance other end connects an end of electric capacity; The said electric capacity other end is connected with an end of second sampling element and the 3rd resistance respectively; The second sampling element other end ground connection, the other end of the 3rd resistance connects the I/O interface of external control unit.
2. sample circuit according to claim 1 is characterized in that: said first sampling element is thermistor or voltage dependent resistor (VDR).
3. sample circuit according to claim 1 is characterized in that: said second sampling element is liquid level sensor or humidity sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205043471U CN202382769U (en) | 2011-12-07 | 2011-12-07 | Sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205043471U CN202382769U (en) | 2011-12-07 | 2011-12-07 | Sampling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202382769U true CN202382769U (en) | 2012-08-15 |
Family
ID=46631266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205043471U Expired - Fee Related CN202382769U (en) | 2011-12-07 | 2011-12-07 | Sampling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202382769U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644148A (en) * | 2017-01-20 | 2017-05-10 | 欧姆龙(上海)有限公司 | Temperature detecting method, device and equipment |
-
2011
- 2011-12-07 CN CN2011205043471U patent/CN202382769U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106644148A (en) * | 2017-01-20 | 2017-05-10 | 欧姆龙(上海)有限公司 | Temperature detecting method, device and equipment |
| CN106644148B (en) * | 2017-01-20 | 2019-09-27 | 欧姆龙(上海)有限公司 | Temperature checking method, temperature-detecting device and temperature testing equipment |
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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: 20120815 Termination date: 20141207 |
|
| EXPY | Termination of patent right or utility model |