CN203037609U - Humidity transmitter - Google Patents
Humidity transmitter Download PDFInfo
- Publication number
- CN203037609U CN203037609U CN 201320003829 CN201320003829U CN203037609U CN 203037609 U CN203037609 U CN 203037609U CN 201320003829 CN201320003829 CN 201320003829 CN 201320003829 U CN201320003829 U CN 201320003829U CN 203037609 U CN203037609 U CN 203037609U
- Authority
- CN
- China
- Prior art keywords
- humidity
- chip microcomputer
- chip
- signal
- 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
Abstract
The utility model discloses a humidity transmitter which comprises a casing and a circuit board arranged in the casing. The circuit board comprises a humidity sensor, an operational amplifier, a single chip microcomputer and a temperature sensor, wherein the humidity sensor is connected with the single chip microcomputer through the operational amplifier, and the temperature sensor is connected with the single chip microcomputer. The humidity sensor is used for detecting the humidity value of the outer environment, converting the humidity value to electric signals and transmitting the electric signals to the operational amplifier. The operational amplifier is used for amplifying the electric signals transmitted from the humidity sensor to amplifying signals and transmitting the amplifying signals to the single chip microcomputer. The temperature sensor is used for detecting the temperature value of the outer environment and transmitting the temperature value to the single chip microcomputer. The single chip microcomputer is used for receiving the amplifying signals and the temperature value, converting the amplifying signals to digital signals through an analog-digital converter and transmitting the digital signals, and performing temperature compensation for the amplifying signals and the digital signals on the basis of the temperature value. The humidity transmitter performs temperature compensation by aid of the temperature sensor, and is small in non-linear errors, high in measurement accuracy, good in stability and strong in practicality.
Description
Technical field
The utility model relates to technical field of automation, especially relates to a kind of humidity transmitter.
Background technology
Sensor is a kind of detecting element, be also referred to as sensitive element, can experience measured information, and the information that detection can be experienced, be for conversion into the information output of electric signal or other desired form according to certain rules, to satisfy requirements such as transmission of Information, processing, storage, demonstration, record and control, it is the primary link of realizing detection automatically and automatic control.
Because sensor generation signal itself is too small and weak and irregular, need further modulate its signal, amplification and linearization process, realizing effective control, the product that sensor is carried out behind the signal condition is called transmitter.
Along with further developing of industrial technology, formed certain standard gradually for the output signal of transmitter, so that with the secondary instrument interface, common several 0-20mA, 4-20mA, 0-5V, 1-5V, 0-10V etc. are simulating signal.
Humidity transmitter is the product of the relative humidity data of reflection environment, is usually used in the environment control of base station monitoring, building automatic control and agricultural greenhouse.
Along with people to producing the raising with the awareness of safety of life, the application of humidity transmitter more and more widely, many places need be installed humidity transmitter and come environment is monitored, and understand the humidity conditions of current environment.But at present there is following shortcoming in domestic most humidity transmitter: nonlinearity erron is big, measuring accuracy is low, temperature coefficient is high and poor stability etc.And traditional humidity transmitter is that the signal that will measure obtain carries out teletransmission, shows do not possess intuitive with magnitude of voltage or current value.
The utility model content
The technical problems to be solved in the utility model is in order to overcome that humidity transmitter in the prior art has that nonlinearity erron is big, measuring accuracy is low, temperature coefficient is high and the defective of poor stability etc., a kind of humidity transmitter is provided, this humidity transmitter have adopt temperature sensor to temperature compensate, nonlinearity erron is little, measuring accuracy is high, have good stability and advantage such as practical.
The utility model solves above-mentioned technical matters by following technical proposals:
The utility model provides a kind of humidity transmitter, it comprises a shell and a setting circuit board in the enclosure, this circuit board comprises a humidity sensor, an operational amplifier, a single-chip microcomputer, this humidity sensor is connected with this single-chip microcomputer by this operational amplifier, its characteristics are, this circuit board also comprises a temperature sensor, and this temperature sensor is connected with this single-chip microcomputer;
This humidity sensor is converted to this humidity value one electric signal and transfers to this operational amplifier for detection of the humidity value of an external environment condition;
This operational amplifier is used for this electric signal that this humidity sensor transmission comes is enlarged into an amplifying signal, and this amplifying signal is transferred to this single-chip microcomputer;
This temperature sensor is for detection of the temperature value of this external environment condition, and this temperature value is transferred to this single-chip microcomputer;
This single-chip microcomputer is used for receiving this amplifying signal and this temperature value, and this amplifying signal is converted to a digital signal and transmission through an analog to digital converter, and based on this temperature value this amplifying signal and this digital signal is carried out temperature compensation.
Wherein, under high-temperature condition, the temperature characteristics deviation is bigger, so need this single-chip microcomputer based on this temperature value this amplifying signal and this digital signal to be carried out temperature compensation.
Preferably, this single-chip microcomputer is a TI(Texas Instruments, Texas Instrument) the MSP430(MSP430 series of company is one 16, have mixed type single-chip microcomputer reduced instruction set computer, super low-power consumption) single-chip microcomputer.This MSP430 single-chip microcomputer has the function of super low-power consumption, so that circuit antijamming capability, stability in this MSP430 single-chip microcomputer improve widely, and make the calibration of this temperature sensor and debugging become very convenient, production efficiency is increased.
Preferably, this humidity sensor is a capacitance type humidity sensor.Certainly, this humidity sensor can also be a resistance-type humidity sensor except being this capacitance type humidity sensor.
Preferably, this capacitance type humidity sensor comprises a capacitance measurement chip, and this capacitance measurement chip is used for the changes in capacitance amount of this capacitance type humidity sensor is converted to a voltage signal and transfers to this operational amplifier.One probe is arranged on this capacitance type humidity sensor, have electric capacity on this probe, the variation of the humidity value of this external environment condition causes the changes in capacitance of the probe of this capacitance type humidity sensor, this capacitance measurement chip checks the relative changes in capacitance amount of the electric capacity of this probe by fixed reference electric capacity, measure the changes in capacitance amount of this probe with the electric bridge of two adjustable current sources and two electric capacity compositions, the electric capacity of reference capacitance and this probe determines the amplitude of integrator, the difference of amplitude has been shown the size of the changes in capacitance amount of this probe, and the changes in capacitance amount is converted to this voltage signal and transfers to this operational amplifier.
Preferably, this operational amplifier is a differential amplifier, and namely this differential amplifier is used for this voltage signal that this humidity sensor transmission comes is enlarged into this amplifying signal.
Preferably, this humidity transmitter also comprises a pio chip, and this pio chip is connected with this single-chip microcomputer, and this pio chip is used for receiving through this next digital signal of this single-chip microcomputer transmission, and this digital signal is converted to simulating signal output.
Preferably, this pio chip is by a SPI(Serial Peripheral Interface, Serial Peripheral Interface (SPI)) interface is connected with this single-chip microcomputer.
Preferably, this pio chip is an ADI(Analog Device Inc., Ya De promise semiconductor technology company or ADI) AD421 of company, this AD421 is used for this digital signal is converted to a current signal.
Preferably, this humidity transmitter also comprises a display chip, this display chip is connected with this single-chip microcomputer, this single-chip microcomputer stores a corresponding tables, this corresponding tables records the corresponding relation of amplifying signal and humidity value, this single-chip microcomputer is used for inquiring about this corresponding tables obtaining corresponding humidity value based on this amplifying signal, and the humidity value that obtains is transferred to this display chip, and this display chip is used for showing the humidity value that obtains.
Positive progressive effect of the present utility model is:
The utility model provides a kind of humidity transmitter, this humidity transmitter have adopt temperature sensor to temperature compensate, nonlinearity erron is little, measuring accuracy is high, have good stability and advantage such as practical.
Description of drawings
Fig. 1 is the structural drawing of the humidity transmitter of the utility model preferred embodiment.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, with the detailed description the technical solution of the utility model, but therefore the utility model is not limited among the described scope of embodiments.
As shown in Figure 1, the humidity transmitter of present embodiment comprises a shell and a setting circuit board in the enclosure, this circuit board comprises a capacitance type humidity sensor 1, one differential amplifier 2, the MSP430 single-chip microcomputer 3 of one TI company, one temperature sensor 4, the AD4215 of one ADI company and a display chip 6, this capacitance type humidity sensor 1 comprises a capacitance measurement chip (not shown), this MSP430 single-chip microcomputer 3 stores a corresponding tables, this corresponding tables records the corresponding relation of amplifying signal and humidity value, this capacitance type humidity sensor 1 is connected with this MSP430 single-chip microcomputer 3 by this differential amplifier 2, this temperature sensor 4, this AD4215 is connected with this MSP430 single-chip microcomputer 3 respectively with this display chip 6.
Wherein, this capacitance type humidity sensor 1 is for detection of the humidity value of an external environment condition, on this capacitance type humidity sensor 1 probe is arranged, have electric capacity on this probe, the variation of the humidity value of this external environment condition causes the changes in capacitance of the probe of this capacitance type humidity sensor 1, and this capacitance measurement chip is used for the changes in capacitance amount of this capacitance type humidity sensor 1 is converted to a voltage signal and transfers to this differential amplifier 2.
This differential amplifier 2 is used for this voltage signal that 1 transmission of this capacitance type humidity sensor comes is enlarged into an amplifying signal, and this amplifying signal is transferred to this MSP430 single-chip microcomputer 3.
This temperature sensor 4 is for detection of the temperature value of this external environment condition, and this temperature value is transferred to this MSP430 single-chip microcomputer 3.
This MSP430 single-chip microcomputer 3 is used for receiving this amplifying signal and this temperature value, this amplifying signal is converted to a digital signal and transfers to this AD4215 through an analog to digital converter, and based on this temperature value this amplifying signal and this digital signal are carried out temperature compensation.
This AD4215 is used for this digital signal is converted to a current signal.
This MSP430 single-chip microcomputer 3 also is used for inquiring about this corresponding tables obtaining corresponding humidity value based on this amplifying signal, and the humidity value that obtains is transferred to this display chip 6, and this display chip 6 is used for showing the humidity value that obtains.
This MSP430 single-chip microcomputer 3 has the function of super low-power consumption, so that circuit antijamming capability, stability in this MSP430 single-chip microcomputer 3 improve widely, and make the calibration of this temperature sensor 4 and debugging become very convenient, production efficiency is increased.
In addition, this humidity sensor can also be a resistance-type humidity sensor except being this capacitance type humidity sensor 1.
When specifically using this humidity transmitter, this capacitance type humidity sensor 1 detects the humidity value of this external environment condition, the variation of the humidity value of this external environment condition causes the changes in capacitance of the probe of this capacitance type humidity sensor 1, and this capacitance measurement chip in this capacitance type humidity sensor 1 is converted to the changes in capacitance amount of this capacitance type humidity sensor 1 voltage signal and transfers to this differential amplifier 2; This differential amplifier 2 is enlarged into amplifying signal with this voltage signal, and transfers to this MSP430 single-chip microcomputer 3; This temperature sensor 4 detects the temperature value of this external environment condition, and this temperature value is transferred to this MSP430 single-chip microcomputer 3; This MSP430 single-chip microcomputer 3 receives this amplifying signal and this temperature value, this amplifying signal is converted to digital signal and transfers to this AD4215 through this analog to digital converter, and based on this temperature value this amplifying signal and this digital signal are carried out temperature compensation, this MSP430 single-chip microcomputer 3 is inquired about this corresponding tables to obtain corresponding humidity value based on this amplifying signal again, and the humidity value that obtains transferred to this display chip 6, this display chip 6 shows the humidity value that obtains; This AD4215 is converted to a current signal with this digital signal.
Though more than described embodiment of the present utility model, it will be understood by those of skill in the art that these only illustrate, protection domain of the present utility model is limited by appended claims.Those skilled in the art can make numerous variations or modification to these embodiments under the prerequisite that does not deviate from principle of the present utility model and essence, but these changes and modification all fall into protection domain of the present utility model.
Claims (9)
1. humidity transmitter, it comprises a shell and a setting circuit board in the enclosure, this circuit board comprises a humidity sensor, an operational amplifier, a single-chip microcomputer, this humidity sensor is connected with this single-chip microcomputer by this operational amplifier, it is characterized in that, this circuit board also comprises a temperature sensor, and this temperature sensor is connected with this single-chip microcomputer;
This humidity sensor is converted to this humidity value one electric signal and transfers to this operational amplifier for detection of the humidity value of an external environment condition;
This operational amplifier is used for this electric signal that this humidity sensor transmission comes is enlarged into an amplifying signal, and this amplifying signal is transferred to this single-chip microcomputer;
This temperature sensor is for detection of the temperature value of this external environment condition, and this temperature value is transferred to this single-chip microcomputer;
This single-chip microcomputer is used for receiving this amplifying signal and this temperature value, and this amplifying signal is converted to a digital signal and transmission through an analog to digital converter, and based on this temperature value this amplifying signal and this digital signal is carried out temperature compensation.
2. humidity transmitter as claimed in claim 1 is characterized in that, this single-chip microcomputer is the MSP430 single-chip microcomputer of a TI company.
3. humidity transmitter as claimed in claim 1 is characterized in that, this humidity sensor is a capacitance type humidity sensor.
4. humidity transmitter as claimed in claim 3, it is characterized in that, this capacitance type humidity sensor comprises a capacitance measurement chip, and this capacitance measurement chip is used for the changes in capacitance amount of this capacitance type humidity sensor is converted to a voltage signal and transfers to this operational amplifier.
5. humidity transmitter as claimed in claim 4 is characterized in that, this operational amplifier is a differential amplifier.
6. humidity transmitter as claimed in claim 1, it is characterized in that, this humidity transmitter also comprises a pio chip, this pio chip is connected with this single-chip microcomputer, this pio chip is used for receiving through this next digital signal of this single-chip microcomputer transmission, and this digital signal is converted to simulating signal output.
7. humidity transmitter as claimed in claim 6 is characterized in that, this pio chip is connected with this single-chip microcomputer by a SPI interface.
8. humidity transmitter as claimed in claim 6 is characterized in that, this pio chip is the AD421 of an ADI company, and this AD421 is used for this digital signal is converted to a current signal.
9. humidity transmitter as claimed in claim 1, it is characterized in that, this humidity transmitter also comprises a display chip, this display chip is connected with this single-chip microcomputer, this single-chip microcomputer stores a corresponding tables, and this corresponding tables records the corresponding relation of amplifying signal and humidity value, and this single-chip microcomputer is used for inquiring about this corresponding tables to obtain corresponding humidity value based on this amplifying signal, and the humidity value that obtains transferred to this display chip, this display chip is used for showing the humidity value that obtains.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003829 CN203037609U (en) | 2013-01-05 | 2013-01-05 | Humidity transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003829 CN203037609U (en) | 2013-01-05 | 2013-01-05 | Humidity transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203037609U true CN203037609U (en) | 2013-07-03 |
Family
ID=48689720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320003829 Expired - Fee Related CN203037609U (en) | 2013-01-05 | 2013-01-05 | Humidity transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203037609U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675035A (en) * | 2013-12-17 | 2014-03-26 | 杭州电子科技大学 | Humidity detection circuit of dyeing and finishing drying room |
| CN103913488A (en) * | 2013-01-05 | 2014-07-09 | 上海朝辉压力仪器有限公司 | Humidity transmitter |
| CN112557452A (en) * | 2020-12-08 | 2021-03-26 | 安徽信息工程学院 | Combined relative humidity sensor |
-
2013
- 2013-01-05 CN CN 201320003829 patent/CN203037609U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103913488A (en) * | 2013-01-05 | 2014-07-09 | 上海朝辉压力仪器有限公司 | Humidity transmitter |
| CN103675035A (en) * | 2013-12-17 | 2014-03-26 | 杭州电子科技大学 | Humidity detection circuit of dyeing and finishing drying room |
| CN112557452A (en) * | 2020-12-08 | 2021-03-26 | 安徽信息工程学院 | Combined relative humidity sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203719811U (en) | Weak voltage signal detection device of micro-voltage sensor | |
| CN203037609U (en) | Humidity transmitter | |
| CN105067492A (en) | Dust concentration meter | |
| CN105806505A (en) | GSM-based high-precision remote temperature monitoring system | |
| CN103424147A (en) | Soilless culture matrix multiparameter detector | |
| CN104916083A (en) | Internet of things based intelligent combustible gas inspection detector and calibration method thereof | |
| CN203785751U (en) | Weighing circuit and electronic scale possessing same | |
| CN104730215A (en) | Gas detection digital bridge and detection processing method thereof | |
| CN205375113U (en) | Industrial automation intelligence monitoring and forewarning system | |
| CN103913488A (en) | Humidity transmitter | |
| CN203053529U (en) | Weighting device | |
| CN206378225U (en) | Pressure transmitter and pressure inverting system | |
| CN202886003U (en) | Intelligent multichannel temperature collection instrument | |
| CN110793686A (en) | Measuring device based on strain type torque sensor | |
| CN202057449U (en) | Piezoresistive sensor temperature and linear compensation system | |
| CN201060079Y (en) | Intelligent differential pressure cell | |
| CN204988959U (en) | Dust concentration appearance | |
| CN202141543U (en) | Temperature-pressure complementation device of pressure sensor based on two-dimensional orthogonal function | |
| CN203191103U (en) | Environment analog quantity acquisition module | |
| CN202735474U (en) | Simple triode feature testing system | |
| CN202916036U (en) | Pressure gauge | |
| CN204255522U (en) | A kind of preventing poor contact circuit of temperature signal transmission | |
| CN103616086A (en) | Thermal resistance temperature transmitter | |
| CN203116870U (en) | Digital temperature measuring device | |
| CN203534732U (en) | Strain transmissible pressure gauge |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20220105 |