CN100389440C - Wireless sensing network node based on capacitive rainfall sensor - Google Patents

Abstract

This invention discloses a kind of wireless sensory network node based on rainfall capacitance sensors, relates to one kind of wireless sensory network. This invention includes rainfall capacitance sensor 1, signal adjusting circuit 2, microprocessor 3, wireless transmission module 4, battery quantity of electric monitor circuit 5, signal adjusting circuit 2, microprocessor 3, wireless transmission module 4 are connected electrically in order, microprocessor 3 and battery quantity of electric monitor circuit 5 are connected electrically .The structure of the invention is concise, and realized the functions with only five function blocks. The function are the data is produced data route, working mode choose and change automatic, battery quantity of electric monitor alarm; the quality of real time is good ,measure is accurate, radio frequency is flexible, the job is reliable; power dissipation is small, low cost, accord with the request of wireless sensory network node organization characteristic.

Description

Radio sensing network node based on capacitive rainfall sensor

Technical field

The present invention relates to a kind of radio sensing network, relate in particular to a kind of radio sensing network node based on capacitive rainfall sensor.

Background technology

Radio sensing network is a kind of emerging sensing network after fieldbus, Industrial Ethernet form; Intelligent little node of types of functionality then is a key point of forming radio sensing network, as the temperature monitoring in the environmental monitoring, humidity detection, light monitoring etc.

Up to now, do not find practical regional rainfall monitoring as yet, its one of the main reasons is: because domestic and international widely used tipping-bucket rain-gauge, capacitance-grid type rain sensor etc. can't satisfy the requirement of radio sensing network node tissue signature now.

Summary of the invention

The objective of the invention is to overcome the problem and shortage that prior art exists, and a kind of radio sensing network node based on capacitive rainfall sensor is provided.

The object of the present invention is achieved like this:

Adopted by the metal polar plate of multi-disc after insulation is handled and connected into the capacitive rainfall sensor of two electrodes and the Analog Baseband part that little power consumption sensor signal conditioning circuit is formed, by the little process chip of little power consumption is that core is formed digital baseband part, forms radio-frequency transmissions and decoding receiving circuit by little power consumption monolithic radio frequency transceiving chip.Form power supply and battery flowmeter charge circle by high-energy battery group and voltage monitoring chip.

Specifically:

As Fig. 1, the present invention includes capacitive rainfall sensor 1, signal conditioning circuit 2, microprocessor 3, wireless transport module 4, battery flowmeter charge circle 5; Capacitive rainfall sensor 1, signal conditioning circuit 2, microprocessor 3, wireless transport module 4 are electrically connected successively, and microprocessor 3 and battery flowmeter charge circle 5 are electrically connected.

Described capacitive rainfall sensor 1 is a kind of sensor of being made up of positive and negative electrode capacitance sheet group;

Described signal conditioning circuit 2 is that a kind of rainfall information is nursed one's health through capacitive rainfall sensor 1 conversion is the circuit of corresponding simulating voltage signal;

Described microprocessor 3 is microprocessors of a kind of super low-power consumption;

Described wireless transport module 4 is a kind of micro power consumption wireless communication chips;

Described battery flowmeter charge circle 5 is a kind of circuit that comprise battery electric quantity chip monitoring and opto-coupler chip.

Principle of work of the present invention is:

Rainfall amount is after capacitive rainfall sensor 1 and signal conditioning circuit 2 are converted to analog electrical signal, convert go forward side by side line linearity correction and rainfall, rainfall pattern of digital signal to by microprocessor 3 and debate the knowledge computing, and the rainfall data after the computing is delivered to wireless transport module 4 send out in real time.Microprocessor 3 is by the on/off of the electronic switch 2.9 control signal modulate circuits 2 of signal conditioning circuit 2, the purpose that cuts down the consumption of energy when reaching non-operation.Because adopt battery flowmeter charge circle 5, the present invention also possesses battery electric quantity real-time monitoring alarming function, can monitor battery electric quantity.

The little process chip of little in addition power consumption (MSP430F149) possesses 6 kinds of mode of operations such as activity pattern, dormancy (low-power consumption) pattern, and working current is looked mode of operation and is not all 0.1--400 μ A; In addition, monolithic radio frequency transceiving chip (TRF6900) is low cost, little power consumption, communication capacity strong (spacious place communication radius is greater than 350 meters) not only, also possesses activity and dormancy mode of operation; So all can having or not according to rainfall amount, the selection of the pattern of finishing the work automatically and conversion, the MAX333A electronic switch can be according to the break-make of the instruction control signal conditioning circuit power supply of microprocessor in addition, thereby reduces node power consumption very effectively, to guarantee the serviceable life of battery.

The present invention has following advantage and good effect:

1, simple for structure, only with 5 functional blocks promptly have data generation, data route, mode of operation selects automatically and conversion, all functions of battery electric quantity monitoring, alarming.

2, real-time is good, accurate measurement, and radio frequency is flexible, reliable operation.

3, little power consumption, low cost meets the requirement of radio sensing network node tissue signature.

Description of drawings

Fig. 1-composition frame chart of the present invention;

Fig. 2 .1-capacitive rainfall sensor structural front view;

The A-A cut-open view of Fig. 2 .2-Fig. 2 .1;

Fig. 3-electrical schematic diagram of the present invention.

The 1-capacitive rainfall sensor,

1.1-shell, the 1.2-insulcrete, the anodal capacitance sheet group of 1.3-, 1.4-negative pole capacitance sheet group,

1.5-liner plate, 1.6-screw, 1.7-nut;

The 2-signal conditioning circuit,

2.1-the sine-wave generator circuit, the 2.2-follower, the 2.3-see-saw circuit,

2.4-sinusoidal wave phase shifter, 2.5-sine wave/square wave conversion circuit,

2.6-sensor measuring circuit, the 2.7-4066A analog switch,

2.8-active low-pass filter; 2.9-MAX333A electronic switch;

The 3-microprocessor;

The 4-wireless transport module;

The 5-battery flowmeter charge circle.

Embodiment

Below in conjunction with drawings and Examples, the present invention is further described:

1, capacitive rainfall sensor 1

As Fig. 2 .1, Fig. 2 .2, capacitive rainfall sensor 1 comprises shell 1.1, insulcrete 1.2, anodal capacitance sheet group 1.3, negative pole capacitance sheet group 1.4, liner plate 1.5, screw 1.6, nut 1.7;

Anodal capacitance sheet group 1.3 and negative pole capacitance sheet group 1.4 are staggered by liner plate 1.5, are fixed on left and right both sides in the square frame that is made of shell 1.1, insulcrete 1.2 by screw 1.6, nut 1.7 respectively again;

Anodal capacitance sheet group 1.3 links to each other by the input end of lead with signal conditioning circuit 2 as output terminal with negative pole capacitance sheet group 1.4.

2, signal conditioning circuit 2

As Fig. 3, signal conditioning circuit 2 comprises ICL8038 sine-wave generator circuit 2.1, follower 2.2, see-saw circuit 2.3, sinusoidal wave phase shifter 2.4, sine wave/square wave conversion circuit 2.5, sensor measuring circuit 2.6,4066A analog switch 2.7, active low-pass filter 2.8, MAX333A electronic switch 2.9, and connect successively.

Specifically:

ICL8038 sine-wave generator circuit 2.1, follower 2.2 connect successively;

One tunnel output of follower 2.2 inserts sensor measuring circuit 2.6 through capacitive rainfall sensor 1, and another road output connects sinusoidal wave phase shifter 2.4 input ends through see-saw circuit 2.3;

The output terminal of see-saw circuit 2.3 not only links to each other with sinusoidal wave phase shifter 2.4 input ends, and links to each other with sensor measuring circuit 2.6 input ends by C6;

Sinusoidal wave phase shifter 2.4 exports sine wave/square wave conversion circuit 2.5 to and finishes the switch control end that exports 4066A analog switch 2.7 after the waveform transformation to;

The input end of 4066A analog switch 2.7 links to each other with sensor measuring circuit 2.6 output terminals, 4066A analog switch 2.7 exports active low-pass filter 2.8 input ends to, and the embedded A/D circuit input end of the output of active low-pass filter 2.8 and little process chip MSP430F149 of little processing 3 links to each other.

Two input ends of MAX333A electronic switch 2.9 connect V+ and V-power supply respectively, two output terminals receive respectively signal conditioning circuit 2+VCC1 and-VEE1, after linking to each other, two control ends of MAX333A electronic switch 2.9 are connected to the I/O mouth of microprocessor 3, by the break-make of microprocessor 3 control signal modulate circuits 2 power supplys.

3, microprocessor 3

It is core devices that microprocessor 3 is selected little power consumption MSP430F149 for use.

4, wireless transport module 4

It is core devices that wireless transport module 4 is selected little power consumption monolithic radio frequency transceiving chip TRF6900 for use.

The serial ports of the MSP430F149 of microprocessor 3 and I/O mouth link to each other with the radio circuit data terminal of TRF6900, by I/O end output control signal realization TRF6900 radio circuit operation mode and the transmitting-receiving conversion of MSP430F149.

5, battery flowmeter charge circle 5

Battery flowmeter charge circle 5 is made up of voltage monitoring chip MAX801 and optocoupler TL817, and the input end of MAX801 links to each other with the electric battery output voltage terminal, and the MAX801 output terminal links to each other with the non-shielding interrupting input end of microprocessor 3 behind optocoupler TL817.

Claims (1)

1. radio sensing network node based on capacitive rainfall sensor is characterized in that:

Comprise capacitive rainfall sensor (1), signal conditioning circuit (2), microprocessor (3), wireless transport module (4), battery flowmeter charge circle (5); Capacitive rainfall sensor (1), signal conditioning circuit (2), microprocessor (3), wireless transport module (4) are electrically connected successively, and microprocessor (3) and battery flowmeter charge circle (5) are electrically connected;

Described capacitive rainfall sensor (1) is a kind of sensor of being made up of positive and negative electrode capacitance sheet group; Comprise shell (1.1), insulcrete (1.2), anodal capacitance sheet group (1.3), negative pole capacitance sheet group (1.4), liner plate (1.5), screw (1.6), nut (1.7); Anodal capacitance sheet group (1.3) and negative pole capacitance sheet group (1.4) are staggered by liner plate (1.5), are fixed on the interior left and right both sides of square frame that are made of shell (1.1), insulcrete (1.2) by screw (1.6), nut (1.7) respectively again; Anodal capacitance sheet group (1.3) links to each other by the input end of lead with signal conditioning circuit 2 as output terminal with negative pole capacitance sheet group (1.4);

Described signal conditioning circuit (2) is that a kind of rainfall information is nursed one's health through capacitive rainfall sensor (1) conversion is the circuit of corresponding simulating voltage signal; Comprise ICL8038 sine-wave generator circuit (2.1), follower (2.2), see-saw circuit (2.3), sinusoidal wave phase shifter (2.4), sine wave/square wave conversion circuit (2.5), sensor measuring circuit (2.6), 4066A analog switch (2.7), active low-pass filter (2.8), MAX333A electronic switch (2.9), and connect successively;

Described microprocessor (3) is a kind of microprocessor of super low-power consumption; Selecting little power consumption MSP430F149 for use is core devices;

Described wireless transport module (4) is a kind of micro power consumption wireless communication chip; Selecting little power consumption monolithic radio frequency transceiving chip TRF6900 for use is core devices;

Described battery flowmeter charge circle (5) is a kind of circuit that comprises battery electric quantity chip monitoring and opto-coupler chip; Be made up of voltage monitoring chip MAX801 and optocoupler TL817, the input end of MAX801 links to each other with the electric battery output voltage terminal, and the MAX801 output terminal links to each other with the non-shielding interrupting input end of microprocessor (3) behind optocoupler TL817.

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