CN102213776A - Wireless sensor network-based humidometer node and humidity detection method - Google Patents
Wireless sensor network-based humidometer node and humidity detection method Download PDFInfo
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- CN102213776A CN102213776A CN 201110137307 CN201110137307A CN102213776A CN 102213776 A CN102213776 A CN 102213776A CN 201110137307 CN201110137307 CN 201110137307 CN 201110137307 A CN201110137307 A CN 201110137307A CN 102213776 A CN102213776 A CN 102213776A
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Abstract
The invention discloses a wireless sensor network-based humidometer node and a humidity detection method, belonging to the technical field of meteorological wireless detection. The wireless sensor network-based humidometer node comprises a voltage-type sensing and conditioning circuit, a capacitance-type sensing and conditioning circuit, a digital-type sensing circuit, a wireless processor, a liquid crystal display module, a USB to serial port circuit and a keyboard, wherein outputs of the voltage-type sensing and conditioning circuit, the capacitance-type sensing and conditioning circuit and the digital-type sensing circuit are respectively connected with the wireless processor and subjected to data fusing and processing to obtain a humidity detection result; the humidity detection result is transmitted to the liquid crystal display module and the USB to serial port circuit and output. According to the wireless sensor network-based humidometer node and the humidity detection method disclosed by the invention, a plurality of sensors can be used for measuring the humidity, and thus the precision and the reliability of humidity detection are improved; and by adopting the CC2530 wireless processor supporting a ZigBee technology as a main control chip for forming the humidity sensor node and by utilizing a wireless sensor network and other meteorological wireless sensor nodes for networking, the wireless sensor network-based humidometer node has the characteristics of no need of communication linkage, convenience for networking, high precision, and the like.
Description
Technical field
The present invention relates to the hygrometer node of wireless sensor network, belong to meteorological radio detection technical field.
Background technology
Wireless sensor network technology begins to enter the application stage, meteorological department still adopts the cable data collection at present, generally be to adopt analog meteorological sensor, through data acquisition unit collection and processing moisture signal, also there is digital sense (change is sent) device of output such as the interface that adopts RS232 to send into data acquisition unit.These systems adopt wired mode, exist to connect complexity, and problems such as loose contact often appear in the maintenance and repair difficulty.
Humidity is common physical quantity, and commonly used at present have voltage output type, electric capacity output type, a digital output type humidity sensor.But because the singularity that humidity parameter is measured, its accuracy and degree of stability are relatively low, are difficult to obtain high Precision Detection.Therefore, only there is the hygrometer of minority can satisfy the requirement of meteorological observation, mostly in the world selected for use the Visa to draw the humidity sensor of company to carry out meteorological observation.
Summary of the invention
Technical matters to be solved by this invention is at the defective in the above-mentioned background technology, and a kind of hygrometer node based on wireless sensor network is provided.
The present invention is for solving the problems of the technologies described above by the following technical solutions.
A kind of hygrometer node based on wireless sensor network comprises that voltage-type humidity sensor modulate circuit, condenser type humidity sensor modulate circuit, digital humidity sensor circuit, wireless processor, LCD MODULE, USB change serial port circuit and keyboard; Wherein voltage-type humidity sensor modulate circuit, condenser type humidity sensor modulate circuit, digital humidity sensor circuit are connected with wireless processor respectively, and wireless processor changes serial port circuit with LCD MODULE, USB respectively, keyboard is connected.
Preferably, hygrometer node based on wireless sensor network of the present invention, voltage-type humidity sensor modulate circuit comprises voltage output type humidity sensor, A/D modular converter, wherein voltage output type humidity sensor induction relative humidity signal carries out sending wireless processor after the analog to digital conversion through the A/D modular converter.
Preferably, hygrometer node based on wireless sensor network of the present invention, condenser type humidity sensor modulate circuit comprises electric capacity output type humidity sensor, electric capacity freq converting circuit, frequency dividing circuit, wherein electric capacity output type humidity sensor is responded to relative humidity signal, convert frequency signal to through the electric capacity frequency-conversion circuit, through sending wireless processor after the frequency dividing circuit reduction frequency.
Preferably, the hygrometer node based on wireless sensor network of the present invention, digital humidity sensor circuit adopts the AM2303 humidity sensor.
Preferably, the hygrometer node based on wireless sensor network of the present invention, wireless processor adopts the CC2530 of TI company.
Preferably, the hygrometer node based on wireless sensor network of the present invention, LCD MODULE adopts the Liquid Crystal Module of 12864 series with serial ports connection.
The present invention also provides a kind of humidity detection method based on wireless sensor network, and its Humidity Detection result adopts three kinds of sensors of various types to obtain through Data Fusion, comprises the steps:
Steps A: the output signal of gathering three kinds of humidity sensors respectively by wireless processor, and in standard humidity generator, demarcate respectively, described three kinds of humidity sensors are voltage output type, electric capacity output type, digital humidity sensor;
Step B: will test respectively and assessment of performance through three humidity sensors demarcating, and obtain the expanded uncertainty of each humidity sensor respectively
,
i=1,2,3, wherein comprise factor k=3, to obtain 99.7% fiducial probability;
Step C: when formally measuring, obtain the detected value of three humidity sensors respectively
,
,
, and try to achieve its intermediate value;
C-1, as the absolute value of the difference of the detected value of each humidity sensor and intermediate value all less than among the step B
Maximal value, then enter step C-3;
C-2, as the absolute value of the difference of the detected value of certain humidity sensor and intermediate value more than or equal among the step B
Maximal value, then this detected value of this humidity sensor is an invalid data, abandons this data, obtains effective humidity sensor number at last
N,1≤
n≤ 3;
C-3, ask for the weight of each effective humidity sensor by following formula:
C-4 presses the detected value of comprehensive each the effective humidity sensor of following formula, and determines final Humidity Detection result:
The present invention adopts above technical scheme compared with prior art, has following technique effect:
Hygrometer node based on wireless sensor network of the present invention utilizes the wireless sensor network of ZigBee technology and other meteorological elements to carry out networking.Owing to adopt wireless sensor network, need not the line of communicating by letter, have and can require increase and decrease node, networking conveniently according to reality, improved practicality.By the data fusion of three kinds of dissimilar humidity sensors, the advantage of comprehensive dissimilar sensor has improved accuracy of detection.
Description of drawings
Fig. 1 is a structural drawing of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in further detail.
As shown in Figure 1, a kind of hygrometer node of the present invention based on wireless sensor network, comprise that voltage-type sensing modulate circuit 1, capacitive sensing modulate circuit 2, digital sense circuit 3, wireless processor, LCD MODULE, USB change serial port circuit 7 and keyboard 6, wherein voltage-type sensing modulate circuit 1, capacitive sensing modulate circuit 2, digital sense circuit 3, LCD MODULE, USB change serial port circuit, keyboard is connected with wireless processor respectively.
Voltage-type sensing modulate circuit 1: humidity sensor can adopt the chip of the HIH4000 series of U.S. Honeywell Inc. production, be voltage-type output signal, the voltage analog of sensor being exported by high-precision A/D conversion chip ICL7135 is converted to digital quantity, and send wireless processor.
Capacitive sensing modulate circuit 2: electric capacity output type humidity sensor can adopt the humidity sensor of the HTS2030 series of French Humirel company, by adopting electric capacity freq converting circuit based on the LM555 oscillator, convert electric capacity to frequency quantity, send wireless processor behind the frequency division, to satisfy the frequency input requirement of processor.
Digital sense circuit 3: the high-precision A M2303 humidity sensor of National Olympic pine electronics corporation during digital humidity sensor circuit can adopt, the digital signal of output is directly sent wireless processor.
Wireless processor: adopt the CC2530 of TI company, by the detection and the data fusion of three sensors of various types of CC2530 realization, comprehensively the advantage of each sensor forms final moisture measurement value.Utilize the ZigBee protocol stack of its support, form the hygrometer node of wireless sensor network, and testing result is sent by wireless sensor network.
LCD MODULE: adopt the Liquid Crystal Module of 12864 series, save the pin of processor, be used to show current humidity value with serial ports connection.
USB changes serial port module: the testing result after wireless processor can being merged is delivered to host computer.
Humidity Detection result adopts three kinds of sensors of various types to obtain through Data Fusion:
At first, wireless processor is gathered the output signal of three kinds of humidity sensors respectively, and demarcates respectively in standard humidity generator, realizes the calibration of three kinds of humidity sensors.
Secondly, test respectively and assessment of performance, obtain indexs such as the accuracy, temperature drift, stability of each sensor, non-linear, sluggishness, thereby try to achieve the expanded uncertainty of each humidity sensor through three humidity sensors demarcating
,
i=1,2,3, wherein comprise factor k=3, to obtain 99.7% fiducial probability.
During formal the measurement, obtain the detected value of three humidity sensors respectively
,
,
, and try to achieve its intermediate value.As the absolute value of the difference of the detected value of certain humidity sensor and intermediate value more than or equal among the step B
Maximal value, then this detected value of this humidity sensor is an invalid data, abandons this data, obtains effective humidity sensor number at last
N,1≤
n≤ 3.
Ask for the weight of each effective humidity sensor by following formula:
Press the detected value of comprehensive each the effective humidity sensor of following formula, and determine final Humidity Detection result:
Below only be preferred embodiment of the present invention,, all any modifications of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all be included within protection scope of the present invention not in order to restriction the present invention.
Claims (7)
1. the hygrometer node based on wireless sensor network is characterized in that: comprise that voltage-type humidity sensor modulate circuit (1), condenser type humidity sensor modulate circuit (2), digital humidity sensor circuit (3), wireless processor, LCD MODULE, USB change serial port circuit and keyboard; Wherein voltage-type humidity sensor modulate circuit (1), condenser type humidity sensor modulate circuit (2), digital humidity sensor circuit (3) are connected with wireless processor respectively, and wireless processor changes serial port circuit with LCD MODULE, USB respectively, keyboard is connected.
2. the hygrometer node based on wireless sensor network according to claim 1, it is characterized in that: described voltage-type humidity sensor modulate circuit (1) comprises voltage output type humidity sensor, A/D modular converter, wherein voltage output type humidity sensor induction relative humidity signal carries out sending wireless processor after the analog to digital conversion through the A/D modular converter.
3. the hygrometer node based on wireless sensor network according to claim 1, it is characterized in that: described condenser type humidity sensor modulate circuit (2) comprises electric capacity output type humidity sensor, electric capacity freq converting circuit, frequency dividing circuit, wherein electric capacity output type humidity sensor is responded to relative humidity signal, convert frequency signal to through the electric capacity frequency-conversion circuit, through sending wireless processor after the frequency dividing circuit reduction frequency.
4. the hygrometer node based on wireless sensor network according to claim 1 is characterized in that: described digital humidity sensor circuit (3) adopts the AM2303 humidity sensor.
5. the hygrometer node based on wireless sensor network according to claim 1 is characterized in that: described wireless processor adopts the CC2530 of TI company.
6. the hygrometer node based on wireless sensor network according to claim 1 is characterized in that: described LCD MODULE adopts the Liquid Crystal Module of 12864 series with serial ports connection.
7. humidity detection method based on wireless sensor network is characterized in that: its Humidity Detection result adopts three kinds of sensors of various types to obtain through Data Fusion, comprises the steps:
Steps A: the output signal of gathering three kinds of humidity sensors respectively by wireless processor, and in standard humidity generator, demarcate respectively, described three kinds of humidity sensors are voltage output type, electric capacity output type, digital humidity sensor;
Step B: will test respectively and assessment of performance through three humidity sensors demarcating, and obtain the expanded uncertainty of each humidity sensor respectively
,
i=1,2,3;
Step C: when formally measuring, obtain the detected value of three humidity sensors respectively
,
,
, and try to achieve its intermediate value;
C-1, as the absolute value of the difference of the detected value of each humidity sensor and intermediate value all less than among the step B
Maximal value, then enter step C-3;
C-2, as the absolute value of the difference of the detected value of certain humidity sensor and intermediate value more than or equal among the step B
Maximal value, then this detected value of this humidity sensor is an invalid data, abandons this data, obtains effective humidity sensor number at last
N,1≤
n≤ 3;
C-3, ask for the weight of each effective humidity sensor by following formula:
；
C-4 presses the detected value of comprehensive each the effective humidity sensor of following formula, and determines final Humidity Detection result:
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| CN2011101373072A CN102213776B (en) | 2011-05-26 | 2011-05-26 | Wireless sensor network-based humidometer node and humidity detection method |
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| CN2011101373072A CN102213776B (en) | 2011-05-26 | 2011-05-26 | Wireless sensor network-based humidometer node and humidity detection method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201166911Y (en) * | 2008-01-16 | 2008-12-17 | 肖贤建 | Wireless mesh network node apparatus for humiture, rainfall and stress meter |
| US7482820B1 (en) * | 2008-05-21 | 2009-01-27 | Advanced Sensor Technologies, Inc. | Sensor for measuring moisture and salinity |
| CN201532211U (en) * | 2009-10-27 | 2010-07-21 | 西安迅腾科技有限责任公司 | Lawn environment parameter data acquisition system based on lawn lamps |
| KR20100110215A (en) * | 2009-04-02 | 2010-10-12 | 주식회사 엠실리콘 | Method, system and sensor circuit for storing correction values into multiple sensor control chips simultaneously |
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2011
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201166911Y (en) * | 2008-01-16 | 2008-12-17 | 肖贤建 | Wireless mesh network node apparatus for humiture, rainfall and stress meter |
| US7482820B1 (en) * | 2008-05-21 | 2009-01-27 | Advanced Sensor Technologies, Inc. | Sensor for measuring moisture and salinity |
| KR20100110215A (en) * | 2009-04-02 | 2010-10-12 | 주식회사 엠실리콘 | Method, system and sensor circuit for storing correction values into multiple sensor control chips simultaneously |
| CN201532211U (en) * | 2009-10-27 | 2010-07-21 | 西安迅腾科技有限责任公司 | Lawn environment parameter data acquisition system based on lawn lamps |
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