CN207764156U - A kind of carbonomonoxide concentration monitoring modular for wireless sensor network - Google Patents
A kind of carbonomonoxide concentration monitoring modular for wireless sensor network Download PDFInfo
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- CN207764156U CN207764156U CN201820222892.3U CN201820222892U CN207764156U CN 207764156 U CN207764156 U CN 207764156U CN 201820222892 U CN201820222892 U CN 201820222892U CN 207764156 U CN207764156 U CN 207764156U
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- gas sensor
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Abstract
A kind of carbonomonoxide concentration monitoring modular for wireless sensor network, it includes gas sensor acquisition front end, wireless communication unit and Power Management Unit；Gas sensor acquisition front end is mainly made of gas sensor and signal amplification unit；Gas sensor is MGS1100 type carbon monoxide transducers；Signal amplification unit is mainly made of instrument amplifier and adjustable resistor RP；Wireless communication unit has been internally integrated wireless radio-frequency front-end, microprocessor and AD converter；The delivery outlet of gas sensor acquisition front end is connected with the simulation input mouth of AD converter, and the digital output of AD converter is connected with the input port of microprocessor, and the delivery outlet of microprocessor is connected with the input port of less radio-frequency front end.The utility model has that circuit structure is simple, small, accuracy of detection is higher, and the advantages of can realize technical grade remote wireless transmission.
Description
Technical field
The utility model is related to a kind of carbonomonoxide concentration monitor system, it is specifically a kind of for wireless sensor network
Carbonomonoxide concentration monitors system, belongs to Test and control field.
Background technology
Wireless sensor network (wireless sensor network, WSN) is a large amount of miniature in monitoring region by being deployed in
Sensor node forms, the network system of the self-organizing of the multi-hop formed through wireless communication.The purpose of WSN is
The information of perceptive object in collaborative sensing, acquisition and processing network's coverage area.It is all to communication, microelectronics, intelligence instrument etc.
Voluminous industry has huge promotion and radiation effects, has to the adjustment of global industrial structure depth, Economic Development Mode transformation important
Its development and application are all paid much attention in realistic meaning, countries in the world.In the development of WSN, wireless data transmission plays the role of a nucleus,
Its technical advance determines the depth and range of WSN applications.On the basis of considering WSN network characterizations, WSN is to collaboration data
The demand of transmission is mainly summarized as following aspects：1. transmission reliability；2. low energy consumption；3. low complex degree.
In addition, the design of various kinds of sensors monitoring node is also to influence entire sensor network in wireless sensor network
The importance that can be showed.Due to, there are a large amount of sensor node, being generally required by hard in wireless sensor network
Part design makes node circuit have under volume, accuracy of detection is higher, low in energy consumption, and can realize that detection data technical grade is remote
The characteristics of range wireless transmission.
For example, CO sensor nodes are exactly an important monitoring mould for wireless sensor network in industrial production
Block.Getting worse is polluted in the discharge of industrial waste gas, fuel-burning gas, vehicle exhaust, internal combustion engine etc. caused by air, wherein
CO gases are very big to the health effect of human body, though traditional analyzer has high measuring accuracy, high sensitivity and detectable concentration model
It encloses the advantages that big, but volume is big, price is high, can not detect in time, and needs to carry out artificial sample, can not be applied to wireless biography
In sensor network.
To sum up, it needs that a kind of circuit structure is simple, small, accuracy of detection is higher in industrial production, and can realize
The CO sensor assemblies of technical grade remote wireless transmission are applied to as sensor node in wireless sensor network.
Utility model content
For deficiencies of the prior art, the purpose of this utility model is how to provide a kind of circuit structure letter
It is single, small, accuracy of detection is higher, and can realize the CO sensor assemblies of technical grade remote wireless transmission.
To achieve the goals above, the utility model uses technical solution below.
A kind of carbonomonoxide concentration monitoring modular for wireless sensor network, it is characterised in that：It includes that gas passes
Sensor acquires front end, wireless communication unit and Power Management Unit；
Gas sensor acquisition front end is mainly made of gas sensor and signal amplification unit；The gas sensing
Device is MGS1100 type carbon monoxide transducers；The fire end of the gas sensor is connected with positive pole VCC, and gas passes
The signal output end VOUT of sensor is connected with one end of load resistance R, the other end ground connection of load resistance R；
The signal amplification unit is mainly made of instrument amplifier and adjustable resistor RP, the letter of the instrument amplifier
Number input terminal is connected with the signal output end VOUT of gas sensor, and the output end of instrument amplifier is gas sensor acquisition
The delivery outlet of front end；A fixing end of adjustable resistor RP links together with tap terminals, and connection electrical nodes are denoted as electrical nodes
The first gain-adjusted end of A, instrument amplifier are connected with electrical nodes A, the second gain-adjusted end of instrument amplifier with it is adjustable
Another fixing end of resistor RP is connected；
The wireless communication unit has been internally integrated wireless radio-frequency front-end, microprocessor and AD converter；The gas passes
The delivery outlet of sensor acquisition front end is connected with the simulation input mouth of the AD converter, the digital output of the AD converter
It is connected with the input port of microprocessor, the delivery outlet of microprocessor is connected with the input port of less radio-frequency front end；
The delivery outlet of less radio-frequency front end is connected by power amplifier with antenna sub-module.
Further, the wireless communication unit is CC2430 type radio frequency chips.
Compared with prior art, the utility model has the following advantages that：
Selected CO concentration sensors use microelectronic technique in the utility model, the insertion in miniature silicon dridge structure
On heater make one layer of SnO2 film, this structure not only make SnO2 films to CO gases within the scope of very wide temperature all
With sensibility, and since silicon fiml reduces the heat loss of heat transfer, thus greatly reduce power consumption.And this sensor only has
4 pins, therefore application circuit is simple in structure.
The utility model wireless communication unit core CC2430 radio frequency chips are in addition to symbol IEEE802.15.4 specifications
2.4GHz less radio-frequencies front end, also in Embedded microprocessor, the also included AD converter of CC2430 radio frequency chips itself, phase
Scheme than the data conversion and processing realized using mutually independent microprocessor chip and AD conversion chip, the utility model
CC2430 radio frequency chips are used to reduce cost and power consumption for main processor.To sum up, the utility model have circuit structure it is simple,
It is small, accuracy of detection is higher, and the advantages of can realize technical grade remote wireless transmission.
In addition the instrument amplifier selected in the utility model not only has the advantages that gain is flexibly adjustable, also has encapsulation
Size is small, power consumption is lower, This further reduces system bulk, meets portable use demand.
Description of the drawings
Fig. 1 is the circuit structure diagram of the utility model；
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of carbonomonoxide concentration monitoring modular for wireless sensor network includes gas sensor
Acquire front end, wireless communication unit and Power Management Unit.
One, the utility model overall structure and work characteristics
The utility model is a kind of technical grade wireless CO concentration monitors sensor monitoring circuit at a distance.Before sensor acquisition
End, which is mainly responsible for, comes in the CO gas concentrations acquisition in external environment, then will be wireless without being fed directly to after the signal amplification made an uproar
Transceiver module is handled；Wireless communication unit is responsible for that the collected real time data of sensor front end is handled and passed
It is defeated；Power management module is mainly responsible for power management and the low-power consumption mode setting to whole system, reaches energy-efficient purpose.
Two, gas sensor acquisition front end circuit structure and operation principle
Gas sensor acquisition front end is mainly made of gas sensor and signal amplification unit.Signal amplification unit is then led
It to be made of instrument amplifier and adjustable resistor RP.Wherein, gas sensor is MGS1100 type carbon monoxide transducers.
The circuit structure that gas sensor acquires front end is as follows：The fire end of gas sensor is connected with positive pole VCC
It connects, the signal output end VOUT of gas sensor is connected with one end of load resistance R, the other end ground connection of load resistance R；Instrument
The signal input part of table amplifier is connected with the signal output end VOUT of gas sensor, and the output end of instrument amplifier is gas
Body sensor acquires the delivery outlet of front end；A fixing end of adjustable resistor RP links together with tap terminals, connects electricity section
Point is denoted as electrical nodes A, and the first gain-adjusted end of instrument amplifier is connected with electrical nodes A, the second gain of instrument amplifier
Adjustable side is connected with another fixing end of adjustable resistor RP.
The carbon monoxide transducer MGS1100 that motorola inc provides is a kind of novel CO detectors.It is tied
Structure feature is to use microelectronic technique, makes one layer of SnO2 film, this knot on embedded heater in miniature silicon dridge structure
Structure not only makes SnO2 films all have sensibility within the scope of very wide temperature to CO gases, and since silicon fiml reduces hot biography
The heat loss led, thus greatly reduces power consumption.
Sensor shares 4 pins, respectively fire end, power end, signal output end and ground terminal.To make sensor pair
CO has best sensitivity characteristic, make SnO2 layers reach scheduled optimum temperature be it is critically important, usual heater and SnO2 layers
Temperature is related with heating voltage, heated current (therefore to reheat end leave of absence heating voltage), in CO gases, SnO2 layers of resistance
It can increase with CO concentration and reduce.
When system works, sensor output resistance (RS) is added to after connecting with load resistance (R) on a voltage source (VCC), R
On pressure drop be the output voltage (VOUT) measured, the output resistance of such sensor can calculate by following formula:RS=[(VC-
VOUT)/VOUT] under the action of CO, the resistance value of SnO2 films reduces R, thus is increased by the electric current of load resistance (R), then
VOUT increases.
Carbon monoxide transducer MGS1100 output signals are sent into the signal being made of instrument amplifier and adjustable resistor RP
Amplifying unit carries out signal amplification, and wherein instrument amplifier AD620 is a low cost, high-precision meter amplifier, AD620 tools
There are high-precision (maximum nonlinearity 40ppm), low maladjustment voltage (50 μ V of maximum) and low offset drift (0.6 μ V/ DEG C of maximum) special
Property, it is the choosing of the ideal of the Precise Data Sampling Systems such as electronic scale and sensor interface.AD620 is using 8 pin SOIC and DIP envelopes
Dress, size is designed less than discrete circuit, and power consumption is lower, thus is very suitable for battery powered and portable use.
AD620 only needs a non-essential resistance gain is arranged, and gain ranging is 1 to 10000, and gain equation formula is G=
49.4kΩ/RP+1.The non-essential resistance of the adjusting gain is realized in the utility model using adjustable resistance RP, therefore turn can
It adjusts the tap terminals of resistance RP that can control the external resistance values RP in above-mentioned gain equation, realizes gain-adjusted.
Include microprocessor and AD converter inside CC2430SoC radio frequency chips employed in wireless communication unit,
Instrument amplifier output signal through above-mentioned AD converter conversion after be sent into above-mentioned microprocessor, microprocessor can according to from
The output voltage of MGS1100 type carbon monoxide transducers calculates sensor output resistance, and to calculate CO concentration, the CO is dense
Degrees of data can be used for remote transmission.
Three, wireless communication unit structure ＆ working mechanism
Wireless communication unit uses the CC2430SoC radio frequency chips of TI companies production.The chip its meet in addition to having
The 2.4GHz less radio-frequencies front end of IEEE802.15.4 specifications, it is also in Embedded microprocessor, included A/D conversion itself
Device, this is greatly lowered power consumption and cost, 8-14 A/D can be selected to change conversion accuracy by software setting.From biography
The signal that sensor acquisition front end is transmitted is sent directly into AD converter and is converted into digital signal, then passes through the object in Software Protocol Stack
Reason layer, MAC layer, data link layer, network layer, transport layer, application layer load successively, are sent finally by radiofrequency signal,
Complete a signal acquisition process and transmission.
According to aforementioned it is found that wireless communication unit has been internally integrated wireless radio-frequency front-end, microprocessor and AD converter.Body
The circuit connecting relation that sensor acquires between front end and wireless communication unit is：Gas sensor acquire front end delivery outlet with
The simulation input mouth of the AD converter is connected, and the digital output of AD converter is connected with the input port of microprocessor,
The delivery outlet of microprocessor is connected with the input port of less radio-frequency front end.
Further, since the demand of commercial Application environment makes wireless transmission distance farther out, and single chip radio frequency processor is defeated
It is smaller to go out power, to limit transmission range, can be solved if carrying out power amplification processing to radio circuit.This practicality is new
Type selects Taiwan up to the power amplifier chip UP2206 of the 2.4GHz of victory company production.Interlock circuit connection relation is：Wirelessly penetrate
The delivery outlet of frequency front end is connected by power amplifier with antenna sub-module.It can be by acquisition and place by antenna sub-module
The signal managed communicates or uploads to monitoring center, exchange data information and transmitting-receiving gathered data with other nodes.
Antenna sub-module mainly use special 2.4G SMA interface high-gains the foldable external antenna with extended line or
The upright antenna of person, carries out different type selectings according to different needs, which is not belonging to the utility model improvements, therefore not
It repeats again.
Four, Power Management Unit
The performance of power unit directly decides the period of node device work, to extend power source life, just should
Consider from the type selecting and battery of operating die low-power consumption are small with capacity great synthesis.Lithium battery has voltage height, energy close
Degree is high, without " memory effect ", discharge curve is gentle the advantages that, it is 850mA lithium rechargeable batteries that the utility model, which chooses battery, and is set
Corresponding charging circuit is counted, charging circuit uses conventional design, and details are not described herein again.
Five, system testing and verification
According to China《Design of Industrial Enterprises sanitary standard》Middle regulation:It is provided in indoor environmental quality standard, carbon monoxide
Concentration limit be 5PPm or so.The utility model is tested by long period networking, and designed product meets the requirements, to
Demonstrate the feasibility of the utility model, the specific product functional parameter such as table of the utility model carbonomonoxide concentration monitoring modular
Shown in one.
Finally illustrate, above example is merely intended for describing the technical solutions of the present application, but not for limiting the present application, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those of ordinary skill in the art that, it can be to this
The technical solution of utility model is modified or replaced equivalently, without departing from the objective and model of technical solutions of the utility model
It encloses, should all cover in the right of the utility model.
Claims (2)
1. a kind of carbonomonoxide concentration monitoring modular for wireless sensor network, it is characterised in that：It includes gas sensing
Device acquires front end, wireless communication unit and Power Management Unit；
Gas sensor acquisition front end is mainly made of gas sensor and signal amplification unit；The gas sensor is
MGS1100 type carbon monoxide transducers；The fire end of the gas sensor is connected with positive pole VCC, gas sensor
Signal output end VOUT be connected with one end of load resistance R, the other end of load resistance R ground connection；
The signal amplification unit is mainly made of instrument amplifier and adjustable resistor RP, and the signal of the instrument amplifier is defeated
Enter end with the signal output end VOUT of gas sensor to be connected, the output end of instrument amplifier is that gas sensor acquires front end
Delivery outlet；A fixing end of adjustable resistor RP links together with tap terminals, and connection electrical nodes are denoted as electrical nodes A, instrument
First gain-adjusted end of table amplifier is connected with electrical nodes A, the second gain-adjusted end of instrument amplifier and adjustable resistance
Another fixing end of device is connected；
The wireless communication unit has been internally integrated wireless radio-frequency front-end, microprocessor and A D converters；The gas sensor
Acquisition front end delivery outlet be connected with the simulation input mouth of the AD converter, the digital output of the AD converter with it is micro-
The input port of processor is connected, and the delivery outlet of microprocessor is connected with the input port of less radio-frequency front end；
The delivery outlet of less radio-frequency front end is connected by power amplifier with antenna sub-module.
2. a kind of carbonomonoxide concentration monitoring modular for wireless sensor network according to claim 1, feature
It is, the wireless communication unit is CC2430 type radio frequency chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820222892.3U CN207764156U (en) | 2018-02-07 | 2018-02-07 | A kind of carbonomonoxide concentration monitoring modular for wireless sensor network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820222892.3U CN207764156U (en) | 2018-02-07 | 2018-02-07 | A kind of carbonomonoxide concentration monitoring modular for wireless sensor network |
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| Publication Number | Publication Date |
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| CN207764156U true CN207764156U (en) | 2018-08-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374688A (en) * | 2018-11-28 | 2019-02-22 | 宁波石墨烯创新中心有限公司 | Gas detection method, equipment and graphene gas sensor based on graphene |
-
2018
- 2018-02-07 CN CN201820222892.3U patent/CN207764156U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109374688A (en) * | 2018-11-28 | 2019-02-22 | 宁波石墨烯创新中心有限公司 | Gas detection method, equipment and graphene gas sensor based on graphene |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180824 Termination date: 20190207 |
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| CF01 | Termination of patent right due to non-payment of annual fee |