Method for sampling humidity sensor by adopting square waves
A humidity sensor, square wave technology, applied in the direction of material resistance, etc., can solve the problems of many electronic components, high cost, complex hardware circuit design of the humidity sensor module, etc., and achieve the effect of simple circuit design, low cost and simple circuit structure
Inactive Publication Date: 2015-04-29
XIAN ZAOXIN ELECTRONICS INFORMATION TECH
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Problems solved by technology
At present, the sampling of humidity adopts the humidity sensor module composed of comparison circuit, compensation circuit, amplifier circuit, temperature resistance, humidity sensor, resistance, capacitance, circuit board and integrated IC chip, etc. to complete the detection of environmental humidity, and then The output voltage signal is then sampled by the single-chip microcomputer MCU on the control board of the home appliance. With this sampling method, the hardware circuit design of the humidity sensor module is more complicated, and the required electronic components are more and the cost is higher.
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[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] As shown in the figure: the present invention provides a kind of method adopting square wave to sample humidity sensor, it comprises the following steps:
[0016] (1), produce square wave: use two I / O ports of single-chip microcomputer MCU to produce two amplitudes, frequency is identical, the square wave of opposite polarity, the amplitude of described square wave is V1, and frequency is F; In this embodiment The amplitude of the square wave used in the test is V1-5V, and the frequency F-1KHz.
[0017] (2) Connect the humidity sensitive resistor RH in parallel with the first resistor and then connect it in series with the second resistor R2. The two ends of this circuit are respectively connected to the two I / O ports of the MCU; the humidity sensitive resistor RH is the humidity sensor.
[0018] (3), the single-chip MCU measu...
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The invention provides a method for sampling a humidity sensor by adopting square waves. The method comprises the following steps: (1) generating the square waves; (2) connecting a humidity sensing resistor RH with a first resistor R1 in parallel and then connecting the humidity sensing resistor RH with a second resistor R2 in series, and connecting the two ends of a circuit with two I / O ports of a single chip microcomputer MCU in the step (1) respectively; (3) detecting voltage V2 at the two ends of the second resistor R2 by the single chip microcomputer MCU, and calculating a resistance value of the RH; (4) obtaining a current environment temperature T and obtaining a humidity property resistance value table of the humidity sensing resistor RH under the current environment temperature according to a temperature property resistance value table of the humidity sensing resistor RH; and (5) obtaining a current humidity value by looking up the humidity property resistance value table of the humidity sensing resistor RH under the current environment temperature and the resistance value table of the RH, and finishing sampling. With the adoption of the method, a circuit design is simple and the cost is relatively low.
Description
Technical field: [0001] The invention relates to the field of home appliances, in particular to a method for sampling humidity sensors using square waves for air conditioners and dehumidifiers. Background technique: [0002] With people's continuous pursuit of quality of life, humidity sensors are more and more used in home appliances. At present, the sampling of humidity adopts the humidity sensor module composed of comparison circuit, compensation circuit, amplifier circuit, temperature resistance, humidity sensor, resistance, capacitance, circuit board and integrated IC chip, etc. to complete the detection of environmental humidity, and then The output voltage signal is then sampled by the single-chip microcomputer MCU on the control board of the home appliance. With this sampling method, the hardware circuit design of the humidity sensor module is more complicated, and the required electronic components are more and the cost is higher. Invention content: [0003] The ...
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Inventor 不公告发明人
Owner XIAN ZAOXIN ELECTRONICS INFORMATION TECH