CN203520209U - Digital circuit-based temperature-humidity measurement and control system - Google Patents
Digital circuit-based temperature-humidity measurement and control system Download PDFInfo
- Publication number
- CN203520209U CN203520209U CN201320632881.XU CN201320632881U CN203520209U CN 203520209 U CN203520209 U CN 203520209U CN 201320632881 U CN201320632881 U CN 201320632881U CN 203520209 U CN203520209 U CN 203520209U
- Authority
- CN
- China
- Prior art keywords
- circuit
- control system
- microprocessor
- display
- humidity sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
Disclosed in the utility model is a digital circuit-based temperature-humidity measurement and control system comprising an SHT11 temperature-humidity sensor, a microprocessor, a display circuit, a driving circuit, an alternating-current solid-state relay and heating and humidifying equipment. The SHT11 temperature-humidity sensor is connected with a signal input terminal of the microprocessor; a display signal output terminal of the microprocessor is connected with the display circuit; a control signal output terminal of the microprocessor is connected with the alternating-current solid-state relay by the driving circuit; and the heating and humidifying equipment is connected to the rear end of the alternating-current solid-state relay. According to the scheme, the digital circuit-based temperature-humidity measurement and control system has characteristics of realizing digital outputting, and being free of debugging, calibrating, and a peripheral circuit, realizing full interchange, having high integration, precision and reliability, and having good application prospects.
Description
Technical field
The utility model has related to a kind of humiture observation and control system based on digital circuit, belongs to the detection technique field of measuring.
Background technology
At present, Temperature Humidity Sensor is in industrial and agricultural production, meteorological, the fields such as environmental protection obtain applying more and more widely, traditional analog Temperature Humidity Sensor, generally not only want modelled signal modulate circuit, also to pass through complicated calibration and calibration process, could improve measuring accuracy, but calibration and the process of demarcating, affected significantly the measuring accuracy of humiture, and Analog Circuit Design is complicated, cost is higher, under long-term use, complicated measuring error can increase along with the time, because can producing temperature, analog electronics floats, need to calibrate, complex procedures.
Utility model content
The purpose of this utility model overcomes traditional analog Temperature Humidity Sensor of the prior art, and calibration and the process of demarcating are complicated, and measuring accuracy is low, and needs periodic calibration, just can guarantee the problem of measuring accuracy.Humiture observation and control system based on digital circuit of the present utility model, digital output, the feature of exempting from debugging, non-calibrating, exempting from peripheral circuit and entirely exchange, by CMOS chip and sensor fusion, high integration, high precision, high reliability, have a good application prospect.
In order to achieve the above object, the technical scheme that the utility model adopts is:
A kind of humiture observation and control system based on digital circuit, it is characterized in that: comprise SHT11 Temperature Humidity Sensor, microprocessor, display circuit, driving circuit, ac solid relay and warming and humidifying equipment, described SHT11 Temperature Humidity Sensor is connected with the signal input part of microprocessor, the display output terminal of described microprocessor is connected with display circuit, described microprocessor control signal output terminal is connected with ac solid relay by driving circuit, and described ac solid relay rear end is connected with warming and humidifying equipment.
The aforesaid humiture observation and control system based on digital circuit, is characterized in that: also comprise key circuit, clock circuit, watchdog circuit, described key circuit, clock circuit, watchdog circuit are connected with microprocessor respectively.
The aforesaid humiture observation and control system based on digital circuit, it is characterized in that: described SHT11 Temperature Humidity Sensor comprises relative humidity sensor, temperature sensor, amplifier, control module, converter and the two-wire serial interface that is integrated in chip internal, described relative humidity sensor, temperature sensor are connected with the output terminal of converter by amplifier, described control module is connected with amplifier, converter respectively, and the output terminal of described converter and control module are connected to two-wire serial interface jointly.
The aforesaid humiture observation and control system based on digital circuit, is characterized in that: described display circuit comprises display driver chip and LED display, and described display driver chip is connected with LED display.
The aforesaid humiture observation and control system based on digital circuit, is characterized in that: described driving circuit is that MC1413 drives integrated chip to form.
The aforesaid humiture observation and control system based on digital circuit, is characterized in that: described ac solid relay inside is provided with photoelectricity isolated location.
The beneficial effects of the utility model are: the humiture observation and control system based on digital circuit of the present utility model, digital output, the feature of exempting from debugging, non-calibrating, exempting from peripheral circuit and entirely exchange, adopt the SHT11 Temperature Humidity Sensor of CMOS chip and sensor fusion, high integration, high precision, high reliability, operation is steady in a long-term, has a good application prospect.
Accompanying drawing explanation
Fig. 1 is the system chart of the humiture observation and control system based on digital circuit of the present utility model.
Fig. 2 is the system chart of SHT11 Temperature Humidity Sensor of the present utility model.
Fig. 3 is the circuit diagram of the humiture observation and control system based on digital circuit of the present utility model.
Embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, a kind of humiture observation and control system based on digital circuit, comprise SHT11 Temperature Humidity Sensor, microprocessor, display circuit, driving circuit, ac solid relay and warming and humidifying equipment, SHT11 Temperature Humidity Sensor is connected with the signal input part of microprocessor, the display output terminal of microprocessor is connected with display circuit, microprocessor control signal output terminal is connected with ac solid relay by driving circuit, and ac solid relay rear end is connected with warming and humidifying equipment.
Wherein, SHT11 Temperature Humidity Sensor, by temperature, humidity sensor amplifier, control module, converter and two-wire serial interface, all be integrated in a chip, volume is only close with large match end, make sensor there is quality brilliance, super fast response, antijamming capability is strong, the high advantages such as cost performance, as shown in Figure 2, temperature sensor, amplifier, control module, converter and two-wire serial interface, relative humidity sensor, temperature sensor is connected with the output terminal of converter by amplifier, control module respectively with amplifier, converter is connected, the output terminal of converter and control module are connected to two-wire serial interface jointly, the measurement temperature of SHT11 Temperature Humidity Sensor acquiescence and the resolution of relative humidity are respectively 14, 12, by the status register in control module, can be down to 12, 8, moisture measurement scope is 0～100%RH, for the resolution of 12, be 0103%RH, temperature-measuring range is-40e～+ 12318e, for the resolution of 14, be 0101e, each sensor chip is demarcated in very accurate humidity chamber, calibration factor is stored in the OTP internal memory of control module with program form, can be to relative humidity automatic calibration in measuring process, make SHT11 Temperature Humidity Sensor there is 100% interchangeability, its measuring principle is first to utilize two sensors to produce respectively relative humidity, the signal of temperature, then through amplifying, , deliver to respectively converter and carry out analog to digital conversion, calibration and error correction, finally by two-wire serial interface, the data of relative humidity and temperature are delivered to microprocessor, recycling microprocessor completes nonlinear compensation and temperature compensation.
Humiture observation and control system based on digital circuit of the present utility model also comprises key circuit, clock circuit, watchdog circuit, described key circuit, clock circuit, watchdog circuit are connected with microprocessor respectively, key circuit can be set the temperature and humidity that needs maintenance, clock circuit is that microprocessor improves work clock, watchdog circuit can be controlled this humiture observation and control system and be subject to external interference (throw and fly as electrostatic interference or program), during system crash, restart this humiture observation and control system, guarantee the normal operation of this humiture observation and control system.
Described display circuit comprises display driver chip and LED display, and display driver chip is connected with LED display, the humiture value of display driver chip driving LED display screen display setting and current humiture value.
Described driving circuit is that MC1413 drives integrated chip to form, driving circuit is used for controlling warming and humidifying equipment and carries out work, warming and humidifying equipment comprises air conditioner, blower fan, hygroscopic machine, the equipment such as humidifier, in order to improve the security performance between driving circuit and equipment, increased ac solid relay, ac solid relay inside is provided with photoelectricity isolated location, can also effectively avoid electromagnetic interference (EMI), when microprocessor detects temperature or humidity value and exceeds preset range, output control signal is by stating driving circuit trigger relay, start electrical work, the work of warming and humidifying equipment.
As shown in Figure 3, circuit diagram for the humiture observation and control system based on digital circuit of the present utility model, microprocessor is selected low-cost AT89C51 single-chip microcomputer, watchdog chip is MAX813L, the crystal oscillator of clock circuit is 12MHz, display driver chip is that MAX7219 drives chip, MAX7219 drives chip interface to adopt synchronous serial Peripheral Interface SPI, programming is simple, and the I/O mouth of saving AT89C51 single-chip microcomputer, LED display is selected 8 light-emitting diode displays, adopt SHT11 Temperature Humidity Sensor that the temperature-humidity signal of input is directly provided for AT89C51 single-chip microcomputer, digital output, exempt from debugging, non-calibrating, exempt from peripheral circuit and entirely exchange, simple in structure, easily realize, with low cost, have a good application prospect.
More than show and described ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is by appending claims and equivalent circle thereof.
Claims (6)
1. the humiture observation and control system based on digital circuit, it is characterized in that: comprise SHT11 Temperature Humidity Sensor, microprocessor, display circuit, driving circuit, ac solid relay and warming and humidifying equipment, described SHT11 Temperature Humidity Sensor is connected with the signal input part of microprocessor, the display output terminal of described microprocessor is connected with display circuit, described microprocessor control signal output terminal is connected with ac solid relay by driving circuit, and described ac solid relay rear end is connected with warming and humidifying equipment.
2. the humiture observation and control system based on digital circuit according to claim 1, is characterized in that: also comprise key circuit, clock circuit, watchdog circuit, described key circuit, clock circuit, watchdog circuit are connected with microprocessor respectively.
3. the humiture observation and control system based on digital circuit according to claim 1, it is characterized in that: described SHT11 Temperature Humidity Sensor comprises relative humidity sensor, temperature sensor, amplifier, control module, converter and the two-wire serial interface that is integrated in chip internal, described relative humidity sensor, temperature sensor are connected with the output terminal of converter by amplifier, described control module is connected with amplifier, converter respectively, and the output terminal of described converter and control module are connected to two-wire serial interface jointly.
4. the humiture observation and control system based on digital circuit according to claim 1, is characterized in that: described display circuit comprises display driver chip and LED display, and described display driver chip is connected with LED display.
5. the humiture observation and control system based on digital circuit according to claim 1, is characterized in that: described driving circuit is that MC1413 drives integrated chip to form.
6. the humiture observation and control system based on digital circuit according to claim 1, is characterized in that: described ac solid relay inside is provided with photoelectricity isolated location.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632881.XU CN203520209U (en) | 2013-10-14 | 2013-10-14 | Digital circuit-based temperature-humidity measurement and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632881.XU CN203520209U (en) | 2013-10-14 | 2013-10-14 | Digital circuit-based temperature-humidity measurement and control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203520209U true CN203520209U (en) | 2014-04-02 |
Family
ID=50379113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320632881.XU Expired - Fee Related CN203520209U (en) | 2013-10-14 | 2013-10-14 | Digital circuit-based temperature-humidity measurement and control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203520209U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102257A (en) * | 2014-07-25 | 2014-10-15 | 四川大学 | On-chip system based wireless temperature and humidity monitoring node and monitoring method thereof |
| CN106002895A (en) * | 2016-07-15 | 2016-10-12 | 国网新疆电力公司阿克苏供电公司 | Portable intelligent safe tool and instrument combined box |
| CN106643119A (en) * | 2016-11-24 | 2017-05-10 | 安徽皖拓自动化有限公司 | Grain drying control system |
-
2013
- 2013-10-14 CN CN201320632881.XU patent/CN203520209U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104102257A (en) * | 2014-07-25 | 2014-10-15 | 四川大学 | On-chip system based wireless temperature and humidity monitoring node and monitoring method thereof |
| CN106002895A (en) * | 2016-07-15 | 2016-10-12 | 国网新疆电力公司阿克苏供电公司 | Portable intelligent safe tool and instrument combined box |
| CN106643119A (en) * | 2016-11-24 | 2017-05-10 | 安徽皖拓自动化有限公司 | Grain drying control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203520209U (en) | Digital circuit-based temperature-humidity measurement and control system | |
| CN201936207U (en) | Temperature control system | |
| CN203414450U (en) | Automatic calibration system of gas sensor | |
| CN207036163U (en) | A kind of Monitoring Urban Environment system based on Internet of Things | |
| CN202383544U (en) | Temperature and humidity monitoring device for electricity metering tank | |
| CN102478869A (en) | Digital display intelligent type humiture controller | |
| CN101788830B (en) | Digital temperature control circuit | |
| CN203759570U (en) | Intelligent control apparatus for greenhouse | |
| CN206670076U (en) | A kind of SCM Based boiler temperature control system | |
| CN203232277U (en) | A high-precision temperature generator based on a microprocessor | |
| CN203378990U (en) | Milk heating device based on MCH (metal ceramics heater) | |
| CN206773561U (en) | A kind of greenhouse production humiture observation and control system | |
| CN207099905U (en) | Grape greenhouse indoor environment remote supervision system | |
| CN211121345U (en) | Double-temperature compensation system of intelligent environment detection panel sensing equipment | |
| CN206440659U (en) | A kind of CPLD humidity measuring circuits | |
| CN202975879U (en) | Laboratory temperature and humidity control device | |
| CN210036969U (en) | RS 485-based mining intrinsically safe infrared thermometer | |
| CN110398519B (en) | Three-array NOx sensor measuring circuit | |
| CN204790653U (en) | Control by temperature change type standard capacitor and temperature control device thereof | |
| CN203930520U (en) | Air volume test regulating device | |
| CN204495392U (en) | A kind of high-accuracy temperature-humidity sensor device | |
| CN202548677U (en) | Intelligent temperature and humidity controller | |
| CN211060182U (en) | Control device on gas stove | |
| CN201477137U (en) | Digital LED display gauge outfit with remote communication interface | |
| CN205580968U (en) | Electric infrared induction gas detection ware shell is released to heat |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20151014 |
|
| EXPY | Termination of patent right or utility model |