CN202120150U - Intelligent humiture monitor - Google Patents

Abstract

The utility model provides an intelligent humiture monitor in which an advanced signal acquisition chip, a nixie tube driving chip and a communication chip are integrated separately. By integrating the signal acquisition chip and the special nixie tube driving chip in the intelligent humiture monitor, the number of separative electronic elements in the intelligent humiture monitor is reduced, the circuit structure and assembly operations of the intelligent humiture monitor are simplified, and the display precision of the intelligent humiture monitor is improved; by utilizing the special communication chip, the communication performance is improved, the overall system reliability of the intelligent humiture monitor is guaranteed by using a photoelectric isolated module to connect an electric energy acquisition chip and a microprocessor; and by using a photoelectric coupling module to connect the communication module and the microprocessor, the communication correct rate is improved, and the error rate is reduced.

Description

A kind of intelligent temperature and humidity watch-dog

Technical field

The utility model relates to temperature humidity signal processing technology field, relates in particular to a kind of intelligent temperature and humidity watch-dog.

Background technology

Ordinary temp or moisture monotor are a kind of detected temperatures or humidity and with the electronic instrument of pointer indicated number (or record) temperature or humidity information; Because measuring output, it possesses intuitive; Dynamic response is sensitive, is used widely in ambient temperature and humidity monitoring field at present.

Accompanying drawing Fig. 1 is the schematic cut-away view of existing ordinary temp or moisture monotor.As shown in Figure 1; Ordinary temp or moisture monotor generally comprise temperature or moisture signal acquisition module 100, signal condition module 200, temperature or humidity information display module 300; Signal condition module 200 is connected with temperature or moisture signal acquisition module 100, temperature or humidity information display module 300 respectively; Wherein, temperature or moisture signal acquisition module 100 are used to gather external temperature or humidity, and the temperature of gathering or humidity are sent to signal condition module 200 handle; Signal condition module 200 is used for the display drive signals of conversion of signals for can supply exporting from temperature or 100 receptions of moisture signal acquisition module, and the drive signal after will changing sends to temperature or humidity information display module 300 shows; Temperature or humidity information display module 300 are used for using pointer indicated number temperature or humidity information according to the drive signal that receives from signal condition module 200.

There are following problem in common this temperature or moisture monotor:

1, in temperature or moisture signal acquisition module 100, the temperature acquisition of on-the-spot registration adopts bimetallic strip more, and temperature measurement error is big, and the bimetallic strip structure precision requires height, processing difficulties; The humidity collection need be used humidity transmitter, increases use cost, and the temperature and humidity collection is difficult to gather together;

2, because temperature or moisture signal acquisition module 100, signal condition module 200, temperature or humidity information display module 300 are cooperatings one to one; That is to say that common temperature or moisture monotor can only be gathered the environment temperature or the humidity of output one portion of road bureau; For multi-point temp and humidity collection; Can not adopt distributed capture, centralized control; Temperature or moisture signal acquisition module 100, signal condition module 200, temperature or the humidity information display module 300 that must increase auxiliary work are gathered multi-point temp and humidity, and cost has high input;

3, pointer data output, the indication accuracy is not high;

4, do not have communication function, rely on the manual patrol image data fully, real-time is poor.

Summary of the invention

In order to overcome the above problems; The utility model provides a kind of intelligent temperature and humidity watch-dog; To simplify the system architecture of common temperature and humidity monitor device; Be adapted to distributed capture, the centralized control of temperature humidity, improve utilization factor, display precision and increase communication, the defencive function of the signal acquisition module of temperature and humidity monitor device.

In order to realize above purpose, the temperature and humidity monitor device that the utility model provides comprises: the temperature humidity signal acquisition module, and it is used to gather the temperature and humidity of surrounding environment, and the temperature and humidity signal of gathering is sent to microprocessor handles; Microprocessor; It is used for the temperature and humidity conversion of signals that receives from the temperature humidity signal acquisition module is the digital signal with demonstration; And the digital signal after will changing sends to the temperature humidity information display module and shows; To be transmitted to temperature humidity signal acquisition module, temperature humidity information display module and output control module from the control signal that host computer receives through communication module simultaneously; Wherein, host computer is used to control the operation of the external device (ED) of temperature humidity information acquisition and demonstration and temperature and humidity monitor device; The temperature humidity information display module, it is used for according to digital signal displays temperature and humidity information from the microprocessor reception; Communication module, it is used for and upper machine communication, and the control signal that host computer sends is sent to microprocessor; Output control module, its output are used for the control signal of operation of the external device (ED) of control moisture temperature watch-dog.

Preferably; Said temperature humidity signal acquisition module comprises temperature sensor circuit, humidity sensor circuit, two low-pass filter circuits that are connected with humidity sensor circuit with temperature sensor circuit respectively and signals collecting chip; Wherein, the ambient temperature signal of collection converts low voltage signal into through temperature sensor circuit, is input to the temperature acquisition mouth of signals collecting chip then through the low-pass filter circuit that is connected with temperature sensor circuit; Simultaneously; The ambient humidity signal of gathering converts low voltage signal to through humidity sensor circuit, is input to the humidity acquisition port of signals collecting chip then through the low-pass filter circuit that is connected with humidity sensor circuit, and the signals collecting chip carries out internal conversion to the voltage signal of gathering; And the magnitude of voltage of output digital quantity; Wherein, said temperature sensor circuit comprises resistive temperature-sensing element (device), and said humidity sensor circuit comprises resistive humidity sensing element.

Preferably, said temperature-sensing element (device) is a RTD, and said temperature sensor circuit is the electric bridge that comprises RTD and LM358; Said humidity sensing element is a hygristor, and said humidity sensor circuit is the electric bridge that comprises hygristor and LM358.

Preferably, said signals collecting chip carries out communication through photoelectric isolation module and microprocessor, and said signals collecting chip outputs to photoelectric isolation module through its Serial Peripheral Interface (SPI) with the magnitude of voltage of digital quantity.

Preferably, said signals collecting chip adopts the MCP3204 chip.

Preferably, said temperature humidity information display module comprises charactron and special-purpose charactron chip for driving, and said charactron chip for driving adopts chip TM1623.

Preferably, said microprocessor adopts the PIC18F4520 microprocessor, and said communication module adopts the ISL485 communication chip.

Preferably, said communication chip carries out communication through photoelectricity coupling module and microprocessor, and said microprocessor adopts universal synchronous/asynchronous serial transmitting-receiving Peripheral Interface to carry out communication through photoelectricity coupling module and communication chip.

Preferably, said communication chip carries out communication through RS485 interface and host computer.

Preferably, Pt type intelligent temperature and humidity watch-dog according to claim 9 is characterized in that, said temperature humidity information display module is changed the screen idsplay order in turn according to the associated temperature humidity information variable that receives from host computer and shown.

Can find out from above technical scheme; The utility model can obtain following technique effect: 1, be applied in the temperature and humidity monitor device through signals collecting chip and special-purpose charactron chip for driving; Increased and gathered dress transducing power, satisfied the input of multi way temperature moisture signal simultaneously, simplified the application and the expansion of temperature and humidity monitor device; Improve the utilization ratio of temperature and humidity monitor device, improved the display precision of temperature humidity; 2, increase special-purpose communication chip, improve real time data acquisition; 3, connect signals collecting chip and microprocessor through photoelectric isolation module, guaranteed the reliability of electric power digital display meter total system; 4, connect communication module and microprocessor through the photoelectricity coupling module, improved the communication accuracy, reduced error rate.

Description of drawings

Fig. 1 is the structural representation of existing common temperature and humidity monitor device;

Fig. 2 is the structural representation according to the intelligent temperature and humidity watch-dog of the utility model;

Fig. 3 is the circuit diagram according to the temperature humidity acquisition module of the utility model;

Fig. 4 is the circuit diagram according to the output control module of the utility model.

Embodiment

The present invention is for the improvements of existing conventional temperature or moisture monotor: in the temperature humidity signal acquisition module, used advanced signals collecting chip; Improved the acquisition precision of temperature humidity signal; And can gather multiple signals simultaneously and handle, be particularly suitable for the monitoring of multiple spot distributed temperature and humidity; In the signal condition module, used the MCU microprocessor, analog quantity has been converted into digital quantity, simplified the signal condition module and constituted; In the temperature humidity information display module, use special-purpose charactron chip for driving and charactron to replace pointer data output, improved the accuracy that shows; Increase communication module and output control module, adopted special-purpose communication chip to support communication function.Below will combine accompanying drawing and embodiment that the utility model is described in detail.

Accompanying drawing 2 is structural representations of the humiture of the utility model.According to Fig. 2; This intelligent temperature and humidity watch-dog comprises temperature humidity signal acquisition module 100, microprocessor 200, temperature humidity information display module 300, communication module 400 and output control module 500; Wherein, microprocessor 200 is connected with temperature-humidity signal acquisition module 100, temperature humidity information display module 300, communication module 400 and output control module 500 respectively.Below will describe the concrete realization of these modules.

(1) the temperature humidity signal acquisition module 100

Temperature humidity signal acquisition module 100 is gathered the temperature and humidity of surrounding environment, and the temperature and humidity signal of gathering is sent to microprocessor 200 handles.

Temperature humidity signal acquisition module 100 comprises temperature sensor circuit, humidity sensor circuit, two low-pass filter circuits that are connected with humidity sensor circuit with temperature sensor circuit respectively and signals collecting chip; Wherein, The ambient temperature signal of gathering converts low voltage signal into through temperature sensor circuit; Be input to the temperature acquisition mouth of signals collecting chip then through the low-pass filter circuit that is connected with temperature sensor circuit; Simultaneously, the ambient humidity signal of collection converts low voltage signal to through humidity sensor circuit, is input to the humidity acquisition port of signals collecting chip then through the low-pass filter circuit that is connected with humidity sensor circuit; The signals collecting chip carries out internal conversion to the voltage signal of gathering, and the magnitude of voltage of output digital quantity.Wherein, temperature sensor circuit comprises resistive temperature-sensing element (device) (for example, RTD); Humidity sensor circuit comprises resistive humidity sensing element, for example, and hygristor.

Fig. 3 is the exemplary circuit diagram of temperature humidity signal acquisition module 100.As shown in Figure 3, temperature humidity signal acquisition module 100 comprises RTD bridge (R11, R12, R13, R14; R15, R16 (that is, RTD), LM358), hygristor bridge (R41, R42; R43, R44, R45, R46 (that is hygristor); LM358), two low-pass filter circuits connecing with RTD bridge and hygristor bridging respectively (C11, R17 is C12) with (C41, R47; C42) and signals collecting chip (that is, the MCP3204 chip), about the detailed introduction of MCP3204 chip, can be referring to official of the U.S. little core company network address.Here, LM358 is known operational amplifier, therefore, omits its detailed description.

As shown in Figure 3, the ambient temperature signal of collection is through RTD bridge (R11, R12, R13; R14, R15, R16; LM358) convert low voltage signal Vot (specifically, the resistance of RTD R16 changes according to the variation of environment temperature, RTD bridge thereby export different low voltage signal Vot) into; (C11, R17 C12) are input to the temperature acquisition mouth CH0 of signals collecting chip MCP3204 to pass through low-pass filter circuit then.Simultaneously, the ambient humidity signal of collection is through hygristor bridge (R41, R42, R43; R44, R45, R46; LM358) convert low voltage signal Voh (specifically, the resistance of hygristor R46 changes according to the variation of ambient humidity, hygristor bridge thereby export different low voltage signal Voh) into; (C41, R47 C42) are input to the humidity acquisition port CH3 of signals collecting chip MCP3204 to pass through low-pass filter circuit then.In signals collecting chip MCP3204, the voltage signal that collects through internal arithmetic from Dout interface (Serial Peripheral Interface (SPI)) output, output be the magnitude of voltage of digital quantity.In the utility model, can expand to the multiple signals input according to user's actual need, MCP3204 can expand 4 road signals at most, can be the combination of temperature and humidity.

In the present embodiment, choose each following components and parts: R11, R41 is 3.01k, R12, R42 are 11.8k; R13, R43 are 11k, and R14, R44 are 12.4k, and R15, R45 are 105k; R17, R47 are 4.7k; C11, C41, C12, C42 are 100nF, and R16 is the Pt100 RTD, and R46 is hygristor HR02.

Here point out that the present invention is not limited to RTD and hygristor, but can adopt any resistive temperature-sensing element (device) and humidity sensing element.At this moment, the Acquisition Circuit structure is basic identical.

Can find out from structure shown in Figure 3; Having used the high signals collecting chip of integrated level directly to convert analog quantity into digital quantity in the utility model handles and exports; Thereby improved original analog quantity to the signal Processing of analog quantity and the pattern of output, realized that the digital collection of temperature humidity information and numeral show, and; Reduce the stochastic error of signals collecting information, thereby improved the precision and the accuracy of temperature and humidity monitor device.In addition, through signal acquisition module shown in Figure 3 100, can gather multi way temperature simultaneously and humidity data is handled, thereby can realize temperature humidity distributed capture, centralized control.

In addition; In order to guarantee the reliability of temperature and humidity monitor device total system; Need be (particularly in signal acquisition module 100; Signals collecting chip MCP3204) adds photoelectric isolation module 600 (see figure 2)s and between the microprocessor 200, that is, need be input to the microprocessor 200 through photoelectric isolation module 600 from the digital signal of the Dout interface output of signals collecting chip MCP3204.Here, the effect of photoelectric isolation module 600 is that humiture collection signal and microprocessor signals are isolated, and does not disturb mutually, thereby guarantees reliability of data transmission.In the present embodiment, photoelectric isolation module 600 can adopt the 6N137 photoelectric isolation module (details can referring to official of U.S. Agilent company network address) of U.S. Agilent company.

(2) microprocessor 200

The temperature and humidity signal that microprocessor 200 will receive from temperature humidity signal acquisition module 100 (promptly; Magnitude of voltage from the digital quantity of signals collecting chip MCP3204 output) converts into the digital signal that shows; And the digital signal after will changing sends to temperature humidity information display module 300 and shows; To be transmitted to temperature humidity signal acquisition module 100, temperature humidity information display module 300 and output control module 500 from the control signal that the host computer (not shown) receives through communication module 400 simultaneously; Here, host computer is generally used for controlling the operation etc. of the external device (ED) of temperature humidity information acquisition and demonstration and temperature and humidity monitor device.

The transformational relation of the temperature and humidity signal of the digital quantity of MCP3204 output and the demonstration numerical value of microprocessor 200 is following:

Wherein, " microprocessor display numerical value " is environment temperature or the humidity that microprocessor 200 shows; Uref is the reference voltage of MCP3204A/D conversion, and Ks is a correction factor, and X0 is 0 ℃ of corresponding numerical value of revising of dissimilar thermistors; " MCP3204 exports numerical value " is the AD converting digital amount of output Voh of output Vot or the hygristor bridge of RTD bridge, and the transformational relation between them is following:

The calculating of Ks is comparatively complicated, needs to confirm with corresponding reference resistor value according to the range of thermistor of being selected for use or hygristor.Below, describe with the demonstration of Temperature numerical.

The temperature one resistance value pitch curve of the RTD that has determined is following:

When-200 ℃＜T＜0 ℃,

Rt＝R ₀(1+aT+bT ²+c(T-100)T ³) (3)

When 0 ℃≤T＜850 ℃,

Rt＝R ₀(1+aT+bT ²) (4)

Wherein, a is 3.9083 * 10 ^-3, b is-5.775 * 10 ^-7, c is-4.183 * 10 ^-12, R ₀The resistance of RTD when being 0 ℃, the resistance of Pt100 in the time of 0 ℃ is 100 Ω.

Existing is example with the Pt100 RTD, calculates as follows according to Fig. 3:

$\mathrm{Vot}=\frac{V\&times;\frac{\mathrm{<figure-callout\; id="12"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}12//R16}{\mathrm{<figure-callout\; id="12"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}12//R16+R11}}{\frac{R14}{\mathrm{<figure-callout\; id="14"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}14+R15}-\frac{\mathrm{<figure-callout\; id="11"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}11//R16}{\mathrm{<figure-callout\; id="11"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}11//R16+R12}}---\left(5\right)$

Order

$\mathrm{Kvt}\left(R16\right)=\frac{\frac{\mathrm{<figure-callout\; id="12"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}12//R16}{\mathrm{<figure-callout\; id="12"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}12//R16+R11}}{\frac{R14}{\mathrm{<figure-callout\; id="14"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}14+R15}-\frac{\mathrm{<figure-callout\; id="11"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}11//R16}{\mathrm{<figure-callout\; id="11"\; label="R"\; filenames="DEST\_PATH\_HSB00000646944000021.png"\; state="\{\{state\}\}">R</figure-callout>}11//R16+R12}}---\left(6\right)$

According to formula (6), formula (5) becomes

Vot(T)＝V×Kvt(T) (7)

Wherein, R16=R _t

Because it is loaded down with trivial details that formula (6) is calculated, and also exist non-linear, very inconvenient in Application Design, therefore approximate treatment Vot as follows.

In the design, be to reflect temperature variation through change in voltage, i.e. T=f (Vot), the variation of in the relation of Vot and T, having hidden the Pt resistance.For asking T=f (Vot), the numerical value of Rt during temperature value when calculating 1 ℃ of every variation according to formula (3) or formula (4) formula, getting V=1v again should value substitution formula (7), can calculate a magnitude of voltage Vot under the corresponding temperature.So, calculate-200 ℃ of-850 ℃ of corresponding Rt and corresponding Vot numerical value through program, the increments of change of Vot is 0.13272400e-2V/ ℃ when obtaining 1 ℃ of every variation through the method for parameter fitting again.At this moment, the relation between temperature T and the Vot can be approximately following linearization relation:

T＝Vot×Ks (8)

Wherein, $\mathrm{Ks}=\frac{1}{0.00132724}.$

Then, need revise formula (1) according to side circuit.For example, Rt=100 Ω is a benchmark during with 0 ℃, gets V=2.5v, calculates Vot=0.817907675V.According to formula (2), formula (1) is modified to:

Here point out that Ks can calculate different numerical with the characteristic of the sensitive resistance of different character, numerical value is merely Pt100 RTD parameter in this example.

In the present embodiment; The PIC18F4520 microprocessor (details can referring to official of company of U.S. Microstar network address) that adopts the U.S. little core company is as microprocessor 200; This microprocessor adopts the C compiler framework of optimization and general input and output pin; Frequency of operation reaches 40MHz, and the supply voltage input is wide, and cost performance is high.

(3) the temperature humidity information display module 300

Temperature humidity information display module 300 is according to the digital signal displays temperature and the humidity information that receive from microprocessor 200.

In order to realize that numeral shows, temperature humidity information display module 300 comprises charactron and special-purpose charactron chip for driving.In the present embodiment, the TM1623 (details can referring to sky, Shenzhen official website of little company) that adopts the little company in sky, Shenzhen is as the charactron chip for driving in the direct current power information display module 300.This chip not only can drive charactron, but also integrated button input function provides the scene of the operational factor of temperature and humidity monitor device to be provided with.

Under showing that the more and screen of variable can not the situation of complete demonstration, temperature humidity information display module 300 can be changed the screen idsplay order in turn according to the associated temperature humidity information variable that receives from host computer and shown.

(4) communication module 400

Communication module 400 carries out communication with host computer; And the control signal that host computer sends sent to microprocessor 200, the control signal of by microprocessor 200 host computer being sent again is transmitted to temperature humidity signal acquisition module 100, temperature humidity information display module 300 and output control module 500.

In the present embodiment; In order to realize the safe and reliable long-distance transmissions of digital signal, the Intersel communication chip ISL485 (details can referring to official of American I ntersel company network address) that adopts American I ntersel company is as communication module 400, through this communication chip; Can remote transmission signal; Prevent impacting with high pressure, realize the safe and reliable transmission of device signal, thereby improved communication performance.

In addition; In order further to improve communication performance; Can between communication module 400 and microprocessor 200, add photoelectricity coupling module 700 (see figure 2)s and isolate the digital signal and the microprocessor signals of communication module 400, thereby can strengthen the communication accuracy, reduce error rate.In the present embodiment, photoelectricity coupling module 700 can adopt the photoelectric isolation module 6N135 (details can referring to official of U.S. Agilent company Web site query) of U.S. Agilent company.

In addition; Communication module 400 is through USART (universal synchronous/asynchronous serial transmitting-receiving) Peripheral Interface and microprocessor 200 communications of microprocessor 200; And communication module 400 is through RS485 interface and upper machine communication, and the advantage that adopts RS485 interface and conventional electric power digital display meter to adopt the RS232 interface to compare is to realize long-distance transmissions and improves transfer rate.

(5) output control module 500

Output control module 500 is exported the control signal of the operation of the external device (ED) (for example, heating plate, blower fan, relay) that is used for the control moisture temperature watch-dog.For example, heat alarm of output in order to the electrical link of isolation temperature and humidity monitor device and external device (ED), and sends to the user when overheated, and the user does protection according to this signal and handles, or directly starts blower fan, and the protection operation is provided.

Fig. 4 is the circuit diagram of output control module 500.As shown in Figure 4, output control module 500 adopts the output of relay node, and wherein, Cont is the control signal node, and this node input signal is sent by microprocessor 200, and RL1, RL2 are the relay output node.

Below with reference to accompanying drawing and embodiment the utility model is described in detail; But; Should be appreciated that the utility model is not limited to above disclosed specific embodiment, any modification based on the disclosed technical scheme of this instructions all should be included in the protection domain of the utility model.

Claims (10)

1. intelligent temperature and humidity watch-dog comprises:

The temperature humidity signal acquisition module, it is used to gather the temperature and humidity of surrounding environment, and the temperature and humidity signal of gathering is sent to microprocessor handles;

Microprocessor; It is used for the temperature and humidity conversion of signals that receives from the temperature humidity signal acquisition module is the digital signal with demonstration; And the digital signal after will changing sends to the temperature humidity information display module and shows; To be transmitted to temperature humidity signal acquisition module, temperature humidity information display module and output control module from the control signal that host computer receives through communication module simultaneously; Wherein, host computer is used to control the operation of the external device (ED) of temperature humidity information acquisition and demonstration and temperature and humidity monitor device;

The temperature humidity information display module, it is used for according to digital signal displays temperature and humidity information from the microprocessor reception;

Communication module, it is used for and upper machine communication, and the control signal that host computer sends is sent to microprocessor;

Output control module, its output are used for the control signal of operation of the external device (ED) of control moisture temperature watch-dog.

2. intelligent temperature and humidity watch-dog according to claim 1; It is characterized in that; Said temperature humidity signal acquisition module comprises temperature sensor circuit, humidity sensor circuit, two low-pass filter circuits that are connected with humidity sensor circuit with temperature sensor circuit respectively and signals collecting chip; Wherein, the ambient temperature signal of collection converts low voltage signal into through temperature sensor circuit, is input to the temperature acquisition mouth of signals collecting chip then through the low-pass filter circuit that is connected with temperature sensor circuit; Simultaneously; The ambient humidity signal of gathering converts low voltage signal to through humidity sensor circuit, is input to the humidity acquisition port of signals collecting chip then through the low-pass filter circuit that is connected with humidity sensor circuit, and the signals collecting chip carries out internal conversion to the voltage signal of gathering; And the magnitude of voltage of output digital quantity

Wherein, said temperature sensor circuit comprises resistive temperature-sensing element (device), and said humidity sensor circuit comprises resistive humidity sensing element.

3. intelligent temperature and humidity watch-dog according to claim 2 is characterized in that, said temperature-sensing element (device) is a RTD, and said temperature sensor circuit is the electric bridge that comprises RTD and LM358; Said humidity sensing element is a hygristor, and said humidity sensor circuit is the electric bridge that comprises hygristor and LM358.

4. intelligent temperature and humidity watch-dog according to claim 2; It is characterized in that; Said signals collecting chip carries out communication through photoelectric isolation module and microprocessor, and said signals collecting chip outputs to photoelectric isolation module through its Serial Peripheral Interface (SPI) with the magnitude of voltage of digital quantity.

5. intelligent temperature and humidity watch-dog according to claim 4 is characterized in that, said signals collecting chip adopts the MCP3204 chip.

6. intelligent temperature and humidity watch-dog according to claim 1 is characterized in that, said temperature humidity information display module comprises charactron and special-purpose charactron chip for driving, and said charactron chip for driving adopts chip TM1623.

7. intelligent temperature and humidity watch-dog according to claim 1 is characterized in that, said microprocessor adopts the PIC18F4520 microprocessor, and said communication module adopts the ISL485 communication chip.

8. intelligent temperature and humidity watch-dog according to claim 7; It is characterized in that; Said communication chip carries out communication through photoelectricity coupling module and microprocessor, and said microprocessor adopts universal synchronous/asynchronous serial transmitting-receiving Peripheral Interface to carry out communication through photoelectricity coupling module and communication chip.

9. intelligent temperature and humidity watch-dog according to claim 8 is characterized in that, said communication chip carries out communication through RS485 interface and host computer.

10. intelligent temperature and humidity watch-dog according to claim 9 is characterized in that, said temperature humidity information display module is changed the screen idsplay order in turn according to the associated temperature humidity information variable that receives from host computer and shown.

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