CN204887487U - High accuracy wireless sensor node and wireless sensor network node system - Google Patents
High accuracy wireless sensor node and wireless sensor network node system Download PDFInfo
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- CN204887487U CN204887487U CN201520100318.7U CN201520100318U CN204887487U CN 204887487 U CN204887487 U CN 204887487U CN 201520100318 U CN201520100318 U CN 201520100318U CN 204887487 U CN204887487 U CN 204887487U
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- wireless sensor
- sensor node
- converter
- node
- solar panel
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Abstract
The utility model provides a high accuracy wireless sensor node and wireless sensor network node system, the wireless sensor node is including the sensor, AD converter and the main control unit that connect gradually, the wireless sensor node still includes electrical power generating system, for the power supply of wireless sensor node, be provided with wireless transceiver module among the main control unit, the AD converter is 24 digital analog conversion chip, the sensor with be provided with low pass filter between the AD converter, low pass filter is used for straining power crosstalk signal in the data that the sensor was gathered, the AD converter with it has the magnetic bead of predetermineeing the resistance value to be provided with between the main control unit, the magnetic bead is used for not keeping apart wireless transceiver module's power and the ground and the power of AD converter with ground, provides a net power and ground for the AD converter. The utility model discloses high accuracy collection that can the quantity performed certificate.
Description
Technical field
The utility model relates to communication technical field, is specifically related to a kind of high precision wireless sensor node and wireless sensor network node system.
Background technology
Existing wireless sensor node existing defects on accuracy of data acquisition, main manifestations is that voltage resolution is too low and Acquisition Error is larger.The voltage resolution of current wireless sensor node is usually at about 2.5mV, and Acquisition Error is between 5% ~ 10%.
The too low main cause of existing wireless sensor node voltage resolution is caused to be the AD converter that existing node adopts MCU inner integrated in order to energy efficient usually.Because the usual integrated level of the MCU being applicable to wireless sensor node is all very high, and system is also very high to the requirement of energy consumption, so AD converter integrated in MCU is generally no more than 14, significance bit is generally no more than 12.This AD converter can meet general data acquisition request, but just helpless for the transducer of the low output of some high accuracy.
The reason causing data acquisition errors larger comes from many factors: from radio-frequency module high-frequency crosstalk, carry out the power supply crosstalk etc. of sensor itself.Except the power supply crosstalk of transducer itself, other crosstalks are all import ADC sampling channel into by VDD-to-VSS.
Based on foregoing description, need to provide a kind of wireless sensor node, can the problems referred to above be overcome, complete the high precision collecting of data.
Utility model content
For defect of the prior art, the utility model provides a kind of high precision wireless sensor node and wireless sensor network node system, can complete the high precision collecting of data.
First aspect, the utility model provides a kind of high precision wireless sensor node, comprises connecting successively: transducer, A/D converter and master controller, and described wireless sensor node also comprises power-supply system, for described wireless sensor node is powered;
Wherein, radio receiving transmitting module is provided with in described master controller;
Wherein, described A/D converter is the analog-digital chip of 24;
Wherein, be provided with low pass filter between described transducer and described A/D converter, described low pass filter is for filtering the power supply crosstalk signal in the data of described transducer collection;
Wherein, the magnetic bead with default resistance value is provided with between described A/D converter and described master controller, described magnetic bead is used for the VDD-to-VSS of radio receiving transmitting module and the VDD-to-VSS of A/D converter to isolate, for A/D converter provides a pure VDD-to-VSS.
Preferably, described power-supply system is uninterruptible power system, and described uninterruptible power system comprises lithium battery and solar panel;
When described solar panel output voltage is lower than the first predetermined threshold value, described lithium battery is that described wireless sensor node is powered;
When described solar panel output voltage is more than or equal to the first predetermined threshold value, described solar panel is that described wireless sensor node is powered.
Preferably, when described solar panel output voltage is more than or equal to the second predetermined threshold value, described solar panel is not only powered for described wireless sensor node, is also described lithium cell charging.
Preferably, described wireless sensor node also comprises control switch, and described control switch is used for opening described transducer at the first Preset Time point, and closes described transducer at the second Preset Time point corresponding with described first Preset Time point.
Preferably, the number of described first Preset Time point and the second Preset Time point is more than one.
Preferably, described master controller is MC13226 chip.
Preferably, described A/D converter is AD7799 analog-digital chip.
Preferably, described default resistance value is 300 Europe.
Second aspect, the utility model provides a kind of wireless sensor network node system, comprises data center, aggregation node and multiple wireless sensor node;
The data of collection are sent to described aggregation node by short-distance wireless mode by each described wireless sensor node;
The data of described multiple wireless sensor node collection are sent to data center by long distance wireless communication mode by described aggregation node.
Preferably, described long distance wireless communication mode comprises GPRS and communicates with short message SMS.
As shown from the above technical solution, the A/D converter of the utility model wireless sensor node by utilizing 24, improve wireless sensor node voltage resolution, and eliminate the power supply disturbance of transducer itself and the high-frequency crosstalk from radio-frequency module by arranging low pass filter and arrange the magnetic bead with default resistance value between transducer and described A/D converter between A/D converter and master controller, thus improve the accuracy of data acquisition of wireless sensor node.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the high precision wireless sensor node that the utility model embodiment one provides;
Fig. 2 is the structural representation of the high precision wireless sensor node that a preferred embodiment of the utility model embodiment one provides;
Fig. 3 is the structural representation of the wireless sensor network node system that the utility model embodiment two provides.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, clear, complete description is carried out to the technical scheme in the utility model embodiment, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 shows the structural representation of the high precision wireless sensor node that the utility model embodiment one provides, described high precision wireless sensor node comprises the transducer 11, A/D converter 12 and the master controller 13 that connect successively, described wireless sensor node also comprises power-supply system 14, for described wireless sensor node is powered;
Wherein, radio receiving transmitting module is provided with in described master controller 13;
Wherein, described A/D converter 12 is the analog-digital chip of 24;
Wherein, be provided with low pass filter 15 between described transducer 11 and described A/D converter 12, described low pass filter 15 is for filtering the power supply crosstalk signal in the data of described transducer collection;
Wherein, the magnetic bead 16 with default resistance value is provided with between described A/D converter 12 and described master controller 13, described magnetic bead 16 for the VDD-to-VSS of radio receiving transmitting module and the VDD-to-VSS of A/D converter are isolated, for A/D converter 12 provides a pure VDD-to-VSS.
The A/D converter of wireless sensor node described in the utility model embodiment by utilizing 24, improve wireless sensor node voltage resolution, and eliminate the power supply disturbance of transducer itself and the high-frequency crosstalk from radio-frequency module by arranging low pass filter and arrange the magnetic bead with default resistance value between transducer and described A/D converter between A/D converter and master controller, thus improve the accuracy of data acquisition of wireless sensor node.
In a preferred embodiment of the utility model embodiment one, see Fig. 2, described power-supply system is uninterruptible power system, and described uninterruptible power system comprises lithium battery and solar panel;
When described solar panel output voltage is lower than the first predetermined threshold value, described lithium battery is that described wireless sensor node is powered;
When described solar panel output voltage is more than or equal to the first predetermined threshold value, described solar panel is that described wireless sensor node is powered.
Preferably, when described solar panel output voltage is more than or equal to the second predetermined threshold value, described solar panel is not only powered for described wireless sensor node, is also described lithium cell charging.
Preferably, described first predetermined threshold value is 2.6V.
Preferably, described second predetermined threshold value is 3.0V.
The transducer that wireless sensor node connects mainly adopts 2.5V supply power voltage, although general less to current requirements, if the long-time continual use of transducer still can cause the quick loss of electric energy, makes lithium battery be in charged state for a long time.Because charging and discharging lithium battery number of times is limited, long-term charging can make lithium battery lose efficacy.For this reason, in order to improve node working life further, reduce energy content of battery consumption, only the opening power again when sensor node needs perception, at other times powered-down.
Therefore, in a preferred embodiment of the utility model embodiment one, see Fig. 2, described high precision wireless sensor node also comprises control switch 17, described control switch 17 for opening described uninterruptible power system at the first Preset Time point, and cuts out described uninterruptible power system at the second Preset Time point corresponding with described first Preset Time point.
The time needing perception data due to described sensor node may be multiple interlude section, and therefore the number of described first Preset Time point and the second Preset Time point is more than one.
Such as, sensor node needs the time period of perception data to be 9:00 ~ 11:00,14:00 ~ 16:00 and 19:00 ~ 20:00, so described control switch 15 opens described uninterruptible power system at the first Preset Time point 9:00, and closes described uninterruptible power system at the second Preset Time point 11:00 corresponding with described first Preset Time point 9:00;
And described control switch 15 opens described uninterruptible power system at the first Preset Time point 14:00, and close described uninterruptible power system at the second Preset Time point 16:00 corresponding with described first Preset Time point 14:00;
And described control switch 15 opens described uninterruptible power system at the first Preset Time point 19:00, and close described uninterruptible power system at the second Preset Time point 20:00 corresponding with described first Preset Time point 19:00.
Preferably, described master controller is MC13226 chip.
Preferably, described A/D converter is AD7799 analog-digital chip.
Preferably, described default resistance value is 300 Europe.
Although MC13226 built-in chip type 12 ADC, the digital-to-analogue isolation of chip internal and the reference voltage of outside 2.5V, make this ADC cannot to realize the high precision collecting of 40 microvolt signals.For this reason, the utility model embodiment adopts the signal conversion chip of AD7799 analog-digital chip as system of ADI company.This chip is 24 ADC, and significance bit is 22.According to the 2.5V reference voltage of outer setting, the utility model can obtain single-ended 1.19 microvolts, and the voltage resolution of difference 2.38 microvolt, meets the requirement of this precision acquisition completely.
The principal element affecting sensor data acquisition error have from radio-frequency module high-frequency crosstalk and carry out the power supply crosstalk of sensor itself.Except the power supply crosstalk of transducer itself, other crosstalks are all import ADC sampling channel into by VDD-to-VSS.In order to reduce the crosstalk from VDD-to-VSS, the VDD-to-VSS of radio-frequency module adopts impedance to be that the VDD-to-VSS of the magnetic bead in 300 Europe and ADC is isolated by the present embodiment, thus is provided with a relatively pure VDD-to-VSS for ADC.In order to reduce the power supply crosstalk carrying out sensor itself, the present embodiment with the addition of low pass filter between transducer and ADC passage, filters the crosstalk signal higher than 50Hz.
By above-mentioned design, achieve single-ended 1.19 microvolts, difference 2.38 microvolt voltage resolution, and data acquisition errors is controlled within 2%.
Fig. 3 shows the structural representation of the wireless sensor network node system that the utility model embodiment two provides, and described wireless sensor network node system comprises data center 21, aggregation node 22 and multiple wireless sensor node 23;
The data of collection are sent to described aggregation node 22 by short-distance wireless mode by each described wireless sensor node 23;
The data that described multiple wireless sensor node 23 gathers are sent to data center 21 by long distance wireless communication mode by described aggregation node 22.
The data that described data center 21 gathers for storing described multiple wireless sensor node 23.
Wherein, described short-distance wireless communication mode is ZigBee communication.
Wherein, described long distance wireless communication mode comprises GPRS and communicates with short message SMS.
Aggregation node is the intermediate member that wireless sensor node and data center carry out exchanges data.Its function mainly comes from the data of sensor node by wireless sensor network reception and sends data to data center.The utility model achieves GPRS and the note SMS telecommunications functions of aggregation node and data center, overcomes the application limitation that conventional wireline communication causes sensor network.
Wireless sensor network node system described in the utility model embodiment, its beneficial effect and the wireless sensor node described in embodiment one similar, do not repeat them here.
Above embodiment, only for illustration of the technical solution of the utility model, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (10)
1. a high precision wireless sensor node, is characterized in that, described wireless sensor node comprises and connecting successively: transducer, A/D converter and master controller, and described wireless sensor node also comprises power-supply system, for described wireless sensor node is powered;
Wherein, radio receiving transmitting module is provided with in described master controller;
Wherein, described A/D converter is the analog-digital chip of 24;
Wherein, be provided with low pass filter between described transducer and described A/D converter, described low pass filter is for filtering the power supply crosstalk signal in the data of described transducer collection;
Wherein, the magnetic bead with default resistance value is provided with between described A/D converter and described master controller, described magnetic bead is used for the VDD-to-VSS of radio receiving transmitting module and the VDD-to-VSS of A/D converter to isolate, for A/D converter provides a pure VDD-to-VSS.
2. wireless sensor node according to claim 1, is characterized in that, described power-supply system is uninterruptible power system, and described uninterruptible power system comprises lithium battery and solar panel;
When described solar panel output voltage is lower than the first predetermined threshold value, described lithium battery is that described wireless sensor node is powered;
When described solar panel output voltage is more than or equal to the first predetermined threshold value, described solar panel is that described wireless sensor node is powered.
3. wireless sensor node according to claim 2, it is characterized in that, when described solar panel output voltage is more than or equal to the second predetermined threshold value, described solar panel is not only powered for described wireless sensor node, is also described lithium cell charging.
4. according to the arbitrary described wireless sensor node of claims 1 to 3, it is characterized in that, described wireless sensor node also comprises control switch, described control switch is used for opening described transducer at the first Preset Time point, and closes described transducer at the second Preset Time point corresponding with described first Preset Time point.
5. wireless sensor node according to claim 4, is characterized in that, the number of described first Preset Time point and the second Preset Time point is more than one.
6., according to the arbitrary described wireless sensor node of claim 1,2,3,5, it is characterized in that, described master controller is MC13226 chip.
7., according to the arbitrary described wireless sensor node of claim 1,2,3,5, it is characterized in that, described A/D converter is AD7799 analog-digital chip.
8., according to the arbitrary described wireless sensor node of claim 1,2,3,5, it is characterized in that, described default resistance value is 300 Europe.
9. a wireless sensor network node system, is characterized in that, described system comprise data center, aggregation node and multiple as claim 1,2,3,5 arbitrary as described in wireless sensor node;
The data of collection are sent to described aggregation node by short-distance wireless mode by each described wireless sensor node;
The data of described multiple wireless sensor node collection are sent to data center by long distance wireless communication mode by described aggregation node.
10. system according to claim 9, is characterized in that, described long distance wireless communication mode comprises GPRS and communicates with short message SMS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100318.7U CN204887487U (en) | 2015-02-12 | 2015-02-12 | High accuracy wireless sensor node and wireless sensor network node system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520100318.7U CN204887487U (en) | 2015-02-12 | 2015-02-12 | High accuracy wireless sensor node and wireless sensor network node system |
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| Publication Number | Publication Date |
|---|---|
| CN204887487U true CN204887487U (en) | 2015-12-16 |
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| CN201520100318.7U Expired - Fee Related CN204887487U (en) | 2015-02-12 | 2015-02-12 | High accuracy wireless sensor node and wireless sensor network node system |
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| CN (1) | CN204887487U (en) |
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- 2015-02-12 CN CN201520100318.7U patent/CN204887487U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151216 Termination date: 20210212 |