CN202974342U - Simple temperature/humidity detection circuit - Google Patents
Simple temperature/humidity detection circuit Download PDFInfo
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- CN202974342U CN202974342U CN 201220740282 CN201220740282U CN202974342U CN 202974342 U CN202974342 U CN 202974342U CN 201220740282 CN201220740282 CN 201220740282 CN 201220740282 U CN201220740282 U CN 201220740282U CN 202974342 U CN202974342 U CN 202974342U
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- humidity
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Abstract
The utility model discloses a simple temperature/ humidity detection circuit. The simple temperature/ humidity detection circuit comprises a first resistor, a second resistor, a humidity sensor, a temperature sensor and an MCU; a first port of the MCU is connected with the humidity sensor; the other end of the humidity sensor and a first resistor are both connected with a second port of the MCU; the other end of the first resistor is connected with a third port of the MCU; one end of the second resistor is connected with power-supplying voltage, and the other end of the second resistor and the temperature sensor are both connected with a fourth port of the MCU; and the other end of the temperature sensor is grounded. The simple temperature/ humidity detection circuit of the utility model has the advantages of low cost, great interchangeability, small quantity of lingered moisture, high humidity resistance, pollution resistance, miniaturization, high precision, integration of temperature and humidity detection and the like.
Description
Technical field
The utility model relates to Temperature/Humidity Control System field, particularly a kind of Simple temperature humidity measuring circuit.
Background technology
Along with modern realization, be difficult to find out a field that has nothing to do with humiture and come.Because application is different, humiture is required also different.From making angle, traditional humiture detects and all measures with the form of humiture module, and this test circuit needs oscillating circuit, driving circuit and amplifying circuit etc.This humidity modular circuit more complicated, components and parts are assorted many, and complex manufacturing and cost compare are high.
The utility model content
The technical matters that one, will solve
The purpose of this utility model is for the existing the problems referred to above of prior art, the spy provides a kind of relatively simple and convenient circuit to test humiture, and have that cost is low, interchangeability good, humidity hysteresis is little, the advantages such as anti-high humidity, antipollution, microminiaturization, precision are high, humiture one.
Two, technical scheme
For solving the problems of the technologies described above, the utility model Simple temperature humidity measuring circuit, wherein, comprise the first resistance, the second resistance, humidity sensor, temperature sensor and MCU, described MCU the first port is connected with described humidity sensor, the described humidity sensor other end and described the first resistance all are connected to MCU the second port, and the described first resistance other end is connected with MCU the 3rd port; Described the second resistance one end connects supply voltage, and the other end all is connected MCU the 4th port with described temperature sensor, described temperature sensor other end ground connection.
As optimization, described the first resistance is 10K-16K, and described the second resistance is 5.1K-10K.
Three, the beneficial effects of the utility model
Compared with prior art, the technical solution of the utility model has the following advantages: cost is low, interchangeability good, humidity hysteresis is little, anti-high humidity, antipollution, microminiaturization, precision are high, the humiture one
Description of drawings
Fig. 1 is the principle schematic of the utility model Simple temperature humidity measuring circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model Simple temperature humidity measuring circuit is described further:
Embodiment one: as shown in Figure 1, the utility model Simple temperature humidity measuring circuit, comprise the first resistance R 1, the second resistance R 2, humidity sensor RH, temperature sensor NTC and MCU, described MCU the first port PORT1 is connected with described humidity sensor RH, the described humidity sensor RH other end and described the first resistance R 1 all are connected to MCU the second port PO RT2, and described first resistance R 1 other end is connected with MCU the 3rd port PO RT3; Described the second resistance R 2 one ends connect supply voltage, and the other end all is connected MCU the 4th port PO RT4 with described temperature sensor NTC, described temperature sensor NTC other end ground connection.
Wherein, described the first resistance is 10K-16K, and described the second resistance is 5.1K-10K.
The course of work of the present utility model is as follows: MCU exports the signal as Fig. 1 left side demonstration to the outside by PORT1, and PORT3 is to the outside output signal opposite with PORT1, this shows, when PORT1 is high level, PORT4 is low level at this moment, through having resistance after humidity sensor RH testing environment humidity, form dividing potential drop with the first resistance R 1 like this, PORT2 voltage at this moment is supply voltage * first resistance R 1/(RH+ the first resistance R 1), MCU just obtains an AD value from the PORT2 pin.And be the AD value that the direct bleeder circuit that is comprised of temperature sensor NTC and the second resistance R 2 is obtained environment temperature on PORT4.Humidity sensor has the temperature coefficient of plus or minus, and its temperature coefficient is not of uniform size, operation temperature area have wide have narrow.So consider issues of temperature compensation.
For the semiconductor ceramics sensor, its resistance and temperature relation be generally exponential function relation, its temperature relation belongs to NTC type, that is: R=R0exp(B/T-AH usually)
H: relative humidity; T: absolute temperature;
R0: the resistance when T=0 ℃ of relative humidity H=0;
A: humidity constant; B: thermal constant.
Humidity temperature coefficient=B/AT2.
If the humidity temperature coefficient of sensor is 0.07%RH/ ℃, working temperature is poor is 30 ℃, and measuring error is 0.21%RH/ ℃, needn't consider temperature compensation; If the humidity temperature coefficient is 0.4%RH/ ℃, cause the error of 12%RH/ ℃, must carry out temperature compensation.
According to the relation of above humiture, can list form corresponding to humiture AD value, MCU is as long as the mode of the AD value that will detect by enquiry form can show the humiture under current environment.Make that humiture testing circuit cost is low, interchangeability good, humidity hysteresis is little, the advantage such as anti-high humidity, antipollution, microminiaturization, precision are high, humiture one.
In sum, above-mentioned embodiment is not to be restricted embodiment of the present utility model, and the modification that all those skilled in the art carry out on the basis of flesh and blood of the present utility model or equivalent deformation are all at technology category of the present utility model.
Claims (2)
1. Simple temperature humidity measuring circuit, it is characterized in that: comprise the first resistance, the second resistance, humidity sensor, temperature sensor and MCU, described MCU the first port is connected with described humidity sensor, the described humidity sensor other end and described the first resistance all are connected to MCU the second port, and the described first resistance other end is connected with MCU the 3rd port; Described the second resistance one end connects supply voltage, and the other end all is connected MCU the 4th port with described temperature sensor, described temperature sensor other end ground connection.
2. Simple temperature humidity measuring circuit as claimed in claim 1, it is characterized in that: described the first resistance is 10K-16K, described the second resistance is 5.1K-10K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220740282 CN202974342U (en) | 2012-12-28 | 2012-12-28 | Simple temperature/humidity detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220740282 CN202974342U (en) | 2012-12-28 | 2012-12-28 | Simple temperature/humidity detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202974342U true CN202974342U (en) | 2013-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220740282 Expired - Fee Related CN202974342U (en) | 2012-12-28 | 2012-12-28 | Simple temperature/humidity detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202974342U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142645B (en) * | 2014-07-25 | 2017-02-15 | 广东志高空调有限公司 | Device and method capable of automatically switching to apply different types of sensor modules |
-
2012
- 2012-12-28 CN CN 201220740282 patent/CN202974342U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142645B (en) * | 2014-07-25 | 2017-02-15 | 广东志高空调有限公司 | Device and method capable of automatically switching to apply different types of sensor modules |
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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: 20130605 Termination date: 20151228 |
|
| EXPY | Termination of patent right or utility model |