CN102721429B - Frequency-output temperature and humidity transmitter - Google Patents
Frequency-output temperature and humidity transmitter Download PDFInfo
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- CN102721429B CN102721429B CN201210207326.2A CN201210207326A CN102721429B CN 102721429 B CN102721429 B CN 102721429B CN 201210207326 A CN201210207326 A CN 201210207326A CN 102721429 B CN102721429 B CN 102721429B
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Abstract
The invention relates to a frequency-output temperature and humidity transmitter which comprises a shell and a circuit board. The circuit board is arranged inside the shell, a plurality of connecting terminals outputting linear frequency signals are disposed on the shell, a temperature sensor, a humidity sensor, an operational amplifier, a single chip microcomputer and time-base circuits are arranged on the circuit board, the time-base circuits convert linear voltage values into pulse signals, an output end of the temperature sensor is connected with an input end of the operational amplifier, an output end of the operational amplifier and an output end of the humidity sensor are respectively connected with the single chip microcomputer by the time-base circuits, the single chip microcomputer is provided with output pins outputting linear frequency signals, and the output pins of the single chip microcomputer are connected with the connecting terminals. Temperature and relative humidity are measured by the temperature sensor and the humidity sensor, the frequency signals are converted by the single chip microcomputer, and accordingly the temperature and humidity transmitter can output digital signals which can be directly read by computer equipment.
Description
Technical field
What the present invention relates to is a kind of technical field of automation, and what be specifically related to is a kind of rate-adaptive pacemaker humiture transducer.
Background technology
Sensor is a kind of detecting element, also referred to as sensitive element, measured information can be experienced, and can will detect the information experienced, the information being for conversion into electric signal or other desired forms according to certain rules exports, to meet the requirements such as the transmission of information, process, storage, display, record and control, it is the primary link realizing automatically detecting and automatically controlling.
Because sensor generation signal itself is too small and weak and irregular, need further to modulate its signal, amplify and linearization process, to realize effective control, the product after sensor is carried out signal condition is called transmitter.
Along with further developing of industrial technology, the output signal for transmitter defines certain standard gradually so that with secondary instrument interface, common several be 0-20mA, 4-20mA, 0-5V, 1-5V, 0-10V etc., be simulating signal.
Humiture transducer is the reflection temperature of environment and the product of relative humidity data, is usually used in building automation, and base station is monitored, the environmental Kuznets Curves of agricultural greenhouse.
Along with the fast development that China's agricultural modernization is built, the application of agricultural greenhouse and greenhouse technology is more and more extensive.Environmental parameter monitor and forecast in greenhouse and booth guarantees the requisite factor of the high-quality high yield of crops.Opertaing device in greenhouse intelligent control system generally adopts computing machine and remote data control system, and humiture transducer conventional on market is analog signals, need the process being converted to digital quantity through analog quantity, the data that could arrive with computer interface transmission measurement, this will reduce system compatibility, and increase the cost of equipment, bring certain obstacle to the intelligentized greenhouse technology of popularization.
Summary of the invention
For the deficiency that prior art exists, the present invention seeks to be that providing a kind of can export the digitized signal that directly can be read by computer equipment, i.e. the rate-adaptive pacemaker humiture transducer of linear frequency signal output.
To achieve these goals, the present invention realizes by the following technical solutions:
Rate-adaptive pacemaker humiture transducer, it circuit board comprising shell and arrange in the enclosure, it is characterized in that, described shell is provided with the connection terminal of a plurality of output linearity frequency signal, described circuit board is provided with temperature sensor, humidity sensor, operational amplifier, single-chip microcomputer and linear voltage value is converted to the time base circuit of pulse signal, the input end of the output terminal concatenation operation amplifier of described temperature sensor, the output terminal of described operational amplifier is connected with single-chip microcomputer respectively by time base circuit with the output terminal of humidity sensor, described single-chip microcomputer is provided with the output pin of output linearity frequency signal, the output pin of described single-chip microcomputer connects connection terminal.
Above-mentioned rate-adaptive pacemaker humiture transducer, wherein, described circuit board is also provided with buffer circuit, the output pin of described single-chip microcomputer is connected with connection terminal by buffer circuit.
Above-mentioned rate-adaptive pacemaker humiture transducer, wherein, what buffer circuit adopted is NPN triode.
Above-mentioned rate-adaptive pacemaker humiture transducer, wherein, what described temperature sensor adopted is temperature platinum resistance, and what described humidity sensor adopted is humicap.
Above-mentioned rate-adaptive pacemaker humiture transducer, wherein, described outer casing bottom is provided with line outlet groove and wall hanging mounting hole.
The measurement that the present invention adopts temperature platinum resistance and humicap to realize temperature and relative humidity, due to these two kinds of sensors output resistance and capacitance respectively, and there is certain nonlinearity erron, need first to be converted to linear analog signal, then carry out the conversion of frequency signal by single-chip microcomputer; It enables humiture transducer export the digitized signal that directly can be read by computer equipment.
Accompanying drawing explanation
The present invention is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is shell mechanism schematic diagram of the present invention;
Fig. 2 is circuit link block figure of the present invention.
Embodiment
The technological means realized for making the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the present invention further.
See Fig. 1 to Fig. 2, rate-adaptive pacemaker humiture transducer of the present invention, it circuit board 2 comprising shell 1 and be arranged in shell 1, the side of shell 1 is provided with a plurality of connection terminal 3, this connection terminal 3 is DP9 connection terminal, and being fixed by welding on circuit board 2, it is inner that this circuit board 2 is arranged on housing 1 by nut; The bottom of the shell 1 of the present embodiment sets out wire casing 4 and wall hanging mounting hole 5, reaches hiding object, facilitates field wiring, make shell handsome in appearance, process meticulous, wall-hanging installation.
In the present embodiment, this circuit board 2 comprises temperature sensor 21, humidity sensor 22, operational amplifier 23, buffer circuit 26, single-chip microcomputer 25 and linear voltage value is converted to the time base circuit 24 of pulse signal.What this temperature sensor 21 adopted is temperature platinum resistance, and what humidity sensor 22 adopted is humicap.The input end of the output terminal concatenation operation amplifier 23 of this temperature sensor 21, the output terminal of described operational amplifier 23 is respectively connected with single-chip microcomputer 25 by a time base circuit 24 respectively with the output terminal of humidity sensor 22, described single-chip microcomputer 24 is provided with the output pin of output linearity frequency signal, the output pin of this single-chip microcomputer connects buffer circuit 26, the connection terminal 3 of output terminal shell 1 outside of this buffer circuit 26.
The present embodiment in use, is first signal conversion; The resistance value that temperature sensor 21 exports is converted to linear voltage value by operational amplifier 23 i.e. operation amplifier integrated circuit by temperature sensor 21, and under the effect of time base circuit 24, is converted to pulse signal; And humidity sensor 22 is directly by time base circuit 24, the capacitance that humidity sensor 22 exports is converted to pulse signal.
Again, signals collecting; Carry IO external interrupt function by single-chip microcomputer 25, by the pulse signal acquisition after above-mentioned conversion to single-chip microcomputer 25, the cycle gathers, and the mode of at every turn interrupting increasing progressively gathers, and is stored in single-chip microcomputer internal RAM variable and calls for subsequent calculations.
3rd, linearly calculate; By the nonlinear compensation of carrying out humiture of tabling look-up, and calculate output frequency size.
4th, rate-adaptive pacemaker; Carried the comparison output function of IO by single-chip microcomputer 25, exported by gained frequency values after calculating, for preventing single-chip microcomputer 25 to be directly connected with outside, centre carries out one-level isolation and buffer circuit 26 by NPN triode as electronic switch.
The detailed process of the present embodiment is: by temperature sensor 21, humidity sensor 22 place in circuit, produce with sensor signal change and the trigger circuit of change, shot timers, by the conversion of time base circuit, formed one irregular, not linear frequency signal, rear further calculating and conversion is gathered again by single-chip microcomputer 25, export the linear frequency signal needed, connect connection terminal 3 by buffer circuit 26, the digitized signal that directly can be read by computer equipment.
The present invention improves on existing basis, employing temperature platinum resistance and humicap realize the measurement to temperature and relative humidity, due to these two kinds of sensors output resistance and capacitance respectively, and there is certain nonlinearity erron, need first to be converted to linear analog signal, the conversion of frequency signal is carried out again by single-chip microcomputer, humiture transducer is enable to export the digitized signal that directly can be read by computer equipment, the i.e. transmitter of linear frequency signal output, the corresponding 0-100 DEG C of its temperature section: kHz-2kHz; The corresponding 0-100RH% of humidifying part 1kHz-2kHz; Its structure is simple, reasonable in design, be worth of widely use.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (1)
1. rate-adaptive pacemaker humiture transducer, it circuit board comprising shell and arrange in the enclosure, it is characterized in that, described shell is provided with the connection terminal of a plurality of output linearity frequency signal, described circuit board is provided with temperature sensor, humidity sensor, operational amplifier, single-chip microcomputer and linear voltage value is converted to the time base circuit of pulse signal, the input end of the output terminal concatenation operation amplifier of described temperature sensor, the output terminal of described operational amplifier is connected with single-chip microcomputer respectively by time base circuit with the output terminal of humidity sensor, described single-chip microcomputer is provided with the output pin of output linearity frequency signal, the output pin of described single-chip microcomputer connects connection terminal, described circuit board is also provided with buffer circuit, the output pin of described single-chip microcomputer is connected with connection terminal by buffer circuit, what described buffer circuit adopted is NPN triode, what described temperature sensor adopted is temperature platinum resistance, what described humidity sensor adopted is humicap, described outer casing bottom is provided with line outlet groove and wall hanging mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207326.2A CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210207326.2A CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102721429A CN102721429A (en) | 2012-10-10 |
| CN102721429B true CN102721429B (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210207326.2A Expired - Fee Related CN102721429B (en) | 2012-06-21 | 2012-06-21 | Frequency-output temperature and humidity transmitter |
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| CN (1) | CN102721429B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142185A (en) * | 2013-05-10 | 2014-11-12 | 重庆金美通信有限责任公司 | Oil and water temperature collecting circuit for hydraulic retarder |
| CN112557452A (en) * | 2020-12-08 | 2021-03-26 | 安徽信息工程学院 | Combined relative humidity sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1357758A (en) * | 2002-01-11 | 2002-07-10 | 东南大学 | Integrated humidity detector with frequency output |
| CN2504671Y (en) * | 2001-07-16 | 2002-08-07 | 复旦大学 | Temp. moisture monitoring circuit device |
| CN2570782Y (en) * | 2002-09-27 | 2003-09-03 | 北京农业信息技术研究中心 | Intelligent humiture self-compensation sensing transducer |
| CN201035743Y (en) * | 2007-04-03 | 2008-03-12 | 范良凯 | Humiture transducer |
| CN201307084Y (en) * | 2008-11-06 | 2009-09-09 | 湖南文理学院 | Novel textile fiber moisture testing oven |
| CN202693152U (en) * | 2012-06-21 | 2013-01-23 | 昆山诺科传感器集成有限公司 | Frequency output temperature and humidity transmitter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854229A (en) * | 2004-04-02 | 2013-01-02 | 硅实验室公司 | Integrated electronic sensor |
-
2012
- 2012-06-21 CN CN201210207326.2A patent/CN102721429B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2504671Y (en) * | 2001-07-16 | 2002-08-07 | 复旦大学 | Temp. moisture monitoring circuit device |
| CN1357758A (en) * | 2002-01-11 | 2002-07-10 | 东南大学 | Integrated humidity detector with frequency output |
| CN2570782Y (en) * | 2002-09-27 | 2003-09-03 | 北京农业信息技术研究中心 | Intelligent humiture self-compensation sensing transducer |
| CN201035743Y (en) * | 2007-04-03 | 2008-03-12 | 范良凯 | Humiture transducer |
| CN201307084Y (en) * | 2008-11-06 | 2009-09-09 | 湖南文理学院 | Novel textile fiber moisture testing oven |
| CN202693152U (en) * | 2012-06-21 | 2013-01-23 | 昆山诺科传感器集成有限公司 | Frequency output temperature and humidity transmitter |
Non-Patent Citations (2)
| Title |
|---|
| 基于HART-HT2012的温/湿度变送器的设计;黄晓琳;《湖北汽车工业学院学报》;20060930;第20卷(第3期);第32-38页 * |
| 温湿度变送器输出参数的校准方法;康赫男;《计量与测试技术》;20110630;第38卷(第8期);第35-36页 * |
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| CN102721429A (en) | 2012-10-10 |
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Address after: No. 308 Zhouzhuang Town Park Road in Kunshan city of Suzhou City, Jiangsu province 215325 room 4 Applicant after: Kunshan Nuoke Sensor Integration Co.,Ltd. Applicant after: Beijing Nokisens SAC Co., Ltd. Applicant after: Beijing Nokisens Electronic Technology Development Co., Ltd. Applicant after: Suzhou Zhongyin Sensing Co., Ltd. Applicant after: Weihai Nokisens SAC Co., Ltd. Address before: No. 308 Zhouzhuang Town Park Road in Kunshan city of Suzhou City, Jiangsu province 215325 room 4 Applicant before: Kunshan Nuoke Sensor Integration Co.,Ltd. Applicant before: Beijing Nokisens SAC Co., Ltd. Applicant before: Beijing Nokisens Electronic Technology Development Co., Ltd. Applicant before: Kunshan Nokisens SAC Co., Ltd. Applicant before: Weihai Nokisens SAC Co., Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD. BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD.;BEIJING NOKISENS SAC CO., LTD.;W BEIJING NOKISENS SAC CO. LTD. BEIJING NOKISENS SAC CO., LTD TO: BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD. BEIJING NEW NORTHKING ELECTRONIC TECHNOLOGY + DEVELOPMENT CO., LTD.;BEIJING NOKISENS SAC CO., LTD.;W SUZHOU ZHONGYIN SENSE CO., LTD. BEIJING NOKISENS SAC CO., LTD |
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Granted publication date: 20150624 Termination date: 20200621 |
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| CF01 | Termination of patent right due to non-payment of annual fee |