CN2596327Y

CN2596327Y - New intelligent sensor for temperature and humidity

Info

Publication number: CN2596327Y
Application number: CN 03204218
Authority: CN
Inventors: 滕光辉; 冯国平
Original assignee: China Agricultural University
Current assignee: China Agricultural University
Priority date: 2003-02-17
Filing date: 2003-02-17
Publication date: 2003-12-31
Anticipated expiration: 2013-02-17

Abstract

The utility model discloses a humiture sensor, particularly an intelligent humiture sensor for the agricultural field. The technical proposal comprises a casing (1), a circuit board (2) which is installed in the casing (1), a connecting terminal (3) which is led out from the circuit board (2), a humidity-sensitive capacitor C< 1 > which is installed on the circuit board (2), and a temperature-sensitive resistor R< 2 > and an oscillating circuit thereof, wherein, the oscillating circuit adopts a double oscillator integrated circuit IC< 1 >, a monolithic computer IC< 2 > is connected with the double oscillator integrated circuit IC< 1 >, and a liquid crystal display IC< 5 > is connected with the monolithic computer IC< 2 >. The sensor has the advantages of simple structure, low cost, etc., and is suitable for agricultural popularization.

Description

The novel intelligent Temperature Humidity Sensor

Technical field

The utility model relates to a kind of Temperature Humidity Sensor, especially for the intelligent temperature and humidity sensor of agriculture field.

Background technology

Temperature and humidity measurement is very traditional measurement project, be that methods such as hair and wet and dry bulb are measured in the past, can not directly reflect airborne relative humidity, in recent years along with science and technology development, high-precision temperature and humidity measurement all adopts macromolecular material, along with temperature and humidity changes and the specific inductive capacity and the change in resistance that produce, the variation of measuring electric signal by electronic circuit reflects the variation of temperature and relative humidity.The sensor that adopts this kind mode to make, widely-used at industrial circle at present, because its cost of manufacture is higher, be difficult to promote the use of at agriculture field.Goal of the invention

The purpose of this utility model provide a kind of advanced technology, simple for structure, production cost is low, is beneficial to the intelligent Temperature Humidity Sensor that agricultural system is used and promoted.

Summary of the invention

In order to reach the purpose of this utility model, the technical scheme of being taked comprises shell 1, be installed in circuit board 2 in the shell 1, drawn the connection terminal 3 that is positioned on the shell 1, be installed in the humicap C on the circuit board 2 by circuit board 2 ₁, thermo-sensitive resistor R ₂And corresponding oscillatory circuit, it is characterized in that, adopted the double oscillator integrated circuit (IC) in this oscillatory circuit ₁, with this pair oscillating integrated circuit IC ₁That be connected is one-chip computer IC ₂, with this one-chip computer IC ₂Link to each other and be connected to LCD IC ₅

In the above-mentioned novel intelligent Temperature Humidity Sensor, one-chip computer IC ₂Output terminal be connected to communication interface chip IC ₃, this communication interface chip IC ₃Output terminal and connection terminal 3, i.e. CN ₁Join.

In the above-mentioned novel intelligent Temperature Humidity Sensor, one-chip computer IC ₂Model be AT90S2303.

Because the utility model has adopted the double oscillator integrated circuit (IC) ₁And one-chip computer IC ₂, not only avoid numerous and diverse circuit of the prior art, and given full play to the advantage of single-chip microcomputer, have the liquid crystal display function, intelligent degree obviously improves.This novel intelligent Temperature Humidity Sensor has simple in structure, and is with low cost, is suitable for advantages such as agricultural extension.

Description of drawings

Fig. 1 is the structural representation of this novel intelligent Temperature Humidity Sensor;

Fig. 2 is the board structure of circuit synoptic diagram of this novel intelligent Temperature Humidity Sensor;

Fig. 3 is the circuit theory diagrams of this novel intelligent Temperature Humidity Sensor.

Embodiment

As shown in Figure 1,1 is shell, and 2 is circuit board, and 3 is connection terminal, and 4 is LCD, in circuit theory diagrams shown in Figure 3, and this LCD symbol IC ₅Expression.

Fig. 2 is the structural representation of circuit board, and circuit board 2 is fixed in the shell 1, and the LCD 4 that is connected with circuit board 2 is embedded in the upper surface of shell 1.

As shown in Figure 3, C ₁Be humicap, R ₂Be thermo-sensitive resistor, IC ₁It is the double oscillator integrated circuit.C ₁And R ₃, R ₄And IC ₁Form oscillator, output pulse signal is delivered to one-chip computer IC ₂INT ₀End, this pulse signal is through one-chip computer IC ₂IC is passed through in digital processing ₂P _0.0～P _0.4Line is delivered to IC ₅LCD directly shows humidity value, and these data are passed through communication interface chip IC ₃With the host computer communication.R ₂And R ₁, C ₂And IC ₁Form oscillator, temperature change value is converted to pulse signal and delivers to IC ₂INT ₁End.This pulse signal is through single-chip microcomputer IC ₂Become numerical value after the processing, through IC ₂P _0.0～P _0.4Deliver to IC ₅LCD, direct video data, and by communication interface chip IC ₃With the miscellaneous equipment swap data, that be connected with miscellaneous equipment is connection terminal CN ₁, i.e. 3 among Fig. 1, CN ₁Six lead ends be respectively: 1 '-power supply just, 2 '-power-, 3 ', 4 '-spare interface, 5 '-data+, 6 '-data minus.

The utility model is fully excavated the performance of single-chip microcomputer, utilize the time response of capacitor charge and discharge to be converted into cycle and frequency, utilize Single Chip Microcomputer (SCM) program to be processed into digital signal again, and adopt the non-linear of the responsive original paper of mathematical method correction such as linear process, establishment meets the bitcom of general international standard, data is directly passed to the computer terminal that needs use.

Principle of work:

(1) measures original paper and form, cooperate the RC charge-discharge circuit, constitute the oscillation measurement circuit by humicap and thermo-sensitive resistor.

(2) the oscillation measurement circuit becomes pulse train to deliver to single-chip microcomputer the temperature and humidity conversion of signals, and single-chip microcomputer utilizes its interruption and the hardware characteristics of timer and built-in software thereof to convert pulse signal to data.

(3) after single-chip microcomputer carries out data acquisition and processing (DAP), data are sent on the equipment that needs to use according to serial communication protocol, or the demand of wait equipment extracts by serial communication interface MAX1487.

(4) reserve the control output interface, can make sensor upgrade to embedded temperature and humidity controller.

It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.

Claims

1, a kind of novel intelligent Temperature Humidity Sensor comprises shell (1), is installed in circuit board (2) in the shell (1), drawn the connection terminal (3) that is positioned on the shell (1), is installed in the humicap C on the circuit board (2) by circuit board (2) ₁, thermo-sensitive resistor R ₂And corresponding oscillatory circuit, it is characterized in that, adopted the double oscillator integrated circuit (IC) in this oscillatory circuit ₁, with this pair oscillating integrated circuit IC ₁That be connected is one-chip computer IC ₂, with this one-chip computer IC ₂Link to each other and be connected to LCD IC ₅

2, novel intelligent Temperature Humidity Sensor according to claim 1 is characterized in that, one-chip computer IC ₂Output terminal be connected to communication interface chip IC ₃, this communication interface chip IC ₃Output terminal and connection terminal (3), i.e. CN ₁Join.

3, novel intelligent Temperature Humidity Sensor according to claim 1 and 2 is characterized in that, one-chip computer IC ₂Model be AT90S2303.