CN201476884U - Networked temperature and humidity sensor transmitter - Google Patents
Networked temperature and humidity sensor transmitter Download PDFInfo
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- CN201476884U CN201476884U CN200920186958.9U CN200920186958U CN201476884U CN 201476884 U CN201476884 U CN 201476884U CN 200920186958 U CN200920186958 U CN 200920186958U CN 201476884 U CN201476884 U CN 201476884U
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- temperature
- chip microcomputer
- networked
- humidity sensor
- humidity
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Abstract
The utility model relates to a networked temperature and humidity sensor transmitter, belonging to the field of temperature and humidity detection, the networked temperature and humidity sensor transmitter comprises a single chip microcomputer, a temperature and humidity sensor, a serial alterable memory, an isolated 422 transceiver, a regulated power supply circuit, a network transformer, a monitoring reset circuit and a clock circuit. The utility model overcomes the defects of the prior art of inaccurate measurement and no network access capability. The utility model has the advantages that the applicable temperature range is wide, the measurement of the temperature and the humidity is accurate and the network access capability is good. The networked temperature and humidity sensor transmitter can be used in the military filed and places such as civil environments, houses, buildings and the like.
Description
Technical field
The utility model relates to the temperature and humidity measurement technology, is a kind of networked temperature and humidity sensing transmitter.
Background technology
Traditional temperature detection adopts thermistor as sensor mostly, the signal of gathering is through the conditioning of special conditioning circuit, after converting digital quantity signal to, filtering could handle, so there are many shortcomings such as poor reliability, cost height, precision be low by microprocessor; Traditional Humidity Detection then is that measurement with wet, dew point method, electrolytic process arrive absorption spectroscopy again to various electric humidity measuring methods.Traditional analog temperature and humidity sensing transmitter generally not only needs to design necessary signal conditioning circuit, auxiliary filtering circuit, also will pass through complicated calibration and calibration process, otherwise its accuracy of measurement is difficult to guarantee.
What early stage humiture collection adopted is conventional temperature-sensitive, wet sensitive device, through gamma correction, filtering post-sampling, realize the curve fitting of temperature-sensitive, wet sensitive device and temperature, humidity under the normal temperature environment, but the periphery circuit design complexity, can't satisfy accuracy and reliability requirement.
In a word, there is the not high shortcoming of circuit complexity, measuring accuracy in traditional temperature and humidity sensing transmitter; And it stresses individual node and measures, and networked level is not high.
The utility model content
Technical problem to be solved in the utility model provides a kind of have the simultaneously accurate measurement of humiture and the networked temperature and humidity sensing transmitter of network accessibility in wide temperature range.
The technical scheme that the utility model adopted is as follows:
Networking temperature and humidity sensing transmitter comprises that single-chip microcomputer, Temperature Humidity Sensor, serial can rewrite storer, isolate 422 transceivers, voltage-stabilized power supply circuit, network transformer, monitoring and reset circuit, clock circuit, wherein:
The I/O mouth that the I2C bus connects single-chip microcomputer is passed through in the output of Temperature Humidity Sensor,
The network communication signal of single-chip microcomputer is connected to Ethernet by network transformer,
The serial communication signal of single-chip microcomputer is connected to isolates 422 transceivers,
Serial can be rewritten the I/0 mouth that storer is connected to single-chip microcomputer,
The monitoring and reset circuit is connected with single-chip microcomputer respectively with clock circuit,
Voltage-stabilized power supply circuit connects single-chip microcomputer and provides power supply to it.
Described single-chip microcomputer adopts the networked single-chip microcomputer PICl8F97J60 of Microchip.
Described Temperature Humidity Sensor adopts the integrated sensor of SHT11.
It is CAT93C46 that described serial can be rewritten the storer model.
Described isolation 422 transceivers adopt ADM2490.
Described voltage-stabilized power supply circuit adopts the MIC37501 device.
Good effect of the present utility model is: the utility model can have the accurate measurement and the network accessibility of humiture simultaneously in wide temperature range, but a plurality of networked temperature and humidity sensing transmitter nodes and Surveillance center can constitute the regional environment humiture monitoring network of scale cutting, both can be used for military field, also can be used for occasions such as commercial environment and household, building.Single network temperature and humidity sensing structure of transmitter compactness, and have the characteristic of anti-interference strong and low-power consumption.
Description of drawings
Fig. 1 is a functional-block diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, networked temperature and humidity sensing transmitter comprise that single-chip microcomputer 1, Temperature Humidity Sensor 2, serial can be rewritten storer 3, isolated 422 transceivers 4, voltage-stabilized power supply circuit 5, network transformer 6, monitoring and reset circuit 7, clock circuit 8.
Described single-chip microcomputer adopts the networked single-chip microcomputer PICl8F97J60 of Microchip.
Described Temperature Humidity Sensor adopts the integrated sensor of SHT11.
It is CAT93C46 that described serial can be rewritten the storer model.
Described isolation 422 transceivers adopt ADM2490.
Described voltage-stabilized power supply circuit adopts the MIC37501 device.
The Temperature Humidity Sensor 2 of networking temperature and humidity sensing transmitter adopts the integrated sensor of SHT11.SHT11 is integrated into functions such as humiture detection, signal transformation, A/D conversion on the chip, need not the external analog electronic circuit, can directly be visited by single-chip microcomputer 1, variations such as its humiture, power supply, capacitance deviation and residual current do not influence precision, even and device itself soaked also not can be malfunctioning or error occurs.Therefore, the utility model adopts this chip as the humiture pick-up unit.The digital signal that the humiture of SHT11 output detects is delivered to the I/O mouth of single-chip microcomputer 1 by the I2C bus, is read and is handled by single-chip microcomputer 1 software.The network communication signal of single-chip microcomputer 1 is connected to the primary side of network transformer 6, is connected to Ethernet then.The serial communication signal of single-chip microcomputer 1 is connected to isolates 422 transceivers 4, and process isolation 422 transceivers become the serial communication signal of differential level to export the serial communication conversion of signals of Transistor-Transistor Logic level, realize long-distance transmissions.Serial can be rewritten the I/O mouth that storer 3 is connected to single-chip microcomputer 1, by single-chip microcomputer 1 software storer is read and write, and this storer is used for storing data such as humiture, corrected parameter.Isolate 422 transceivers 4 (ADM2490) and can be good at isolating interfering with each other of extraneous and inner Single Chip Microcomputer (SCM) system, have good Electro Magnetic Compatibility, in can the suitable environment abominable electromagnetic environment.Network transformer 6 be differential signal by the filtering that is coupled of differential mode pickup coil, and be coupled on the connection netting twine of varying level through the conversion of electromagnetic field.Its effect: the one, enhancing signal makes signal transmission distance farther; The 2nd, make networked temperature and humidity sensing transmitter and external isolation, strengthen antijamming capability, this equipment there is certain lightning protection effect; The 3rd, when networked temperature and humidity sensing transmitter is received the network interface of varying level, can prevent that different voltages from damaging this equipment by the netting twine transmission.Monitoring and reset circuit 7 is made of IMP810L monitoring and reset chip, resistance, its effect: the one, provide reset signal to single-chip microcomputer, and single-chip microcomputer is automatically reset or manual reset when crashing when powering on, the beginning executive routine; The 2nd, the monitoring supply voltage makes system's reliable reset, reruns when recovering behind the electric voltage dropping, avoid system lock to stubbornly refuse and can recover.Clock circuit 8 is made of crystal, electric capacity, and its effect is to provide necessary clock signal to single-chip microcomputer, and single-chip microcomputer can be worked normally.
Use a plurality of networked temperature and humidity sensing transmitters can constitute Ethernet humiture detection system, this detection system can be local in-plant, also can be the monitoring of long-distance large-range.Be distributed in the networked temperature and humidity sensing transmitter of each monitoring point of detection system, detected humiture information is transferred to Surveillance center by Ethernet, Surveillance center carries out the control of display alarm and environmental unit after these humiture information analyses are handled.
Realized the ICP/IP protocol stack in the embedded system of networked temperature and humidity sensing transmitter, mainly adopted agreements such as ethernet ieee 802.3, IP, ARP as communication protocol, the transmission data are finished by ethernet controller.Before data send, at first to carry out protocol encapsulation to the data of transmission.Specific practice is: at first raw data is added the TCP head, comprise source port, destination interface, tcp data length and verification and four fields; And then add the IP head, comprise source IP address, purpose IP address, IP data length, verification and etc. 100 fields; Encapsulate ethernet ieee 802.3 frames at last, comprise target MAC (Media Access Control) address, source MAC and ethernet frame total length.Wherein, source MAC is a local physical address, sets when initialization.And the CRC check in the IEEE802.3 frame structure is finished automatically by ethernet hardware.So far, successfully constructed a complete tcp data bag, can carry out data and send.For the packet that receives, primary processor is disassembled it, compares with local ip address unpacking the IP address that obtains, and carries out checksum validation simultaneously, if the IP unanimity then receives this packet, otherwise abandons it; If verification and incorrect is then represented mistake takes place in the transmission of data packets, abandon this packet, but do not produce error message, find the packet and the request retransmission of losing by application layer.
The networked single-chip microcomputer PICl8F97J60 that the utility model adopts Microchip company to produce integrates high-end 8 single-chip microcomputers and complete ethernet controller, with realization temperature and humidity sensing transmitter meshed networkization.
The network and singlechip computer device PICl8F97J60 of Microchip company has the embedded Ethernet controller module.The design of employing Highgrade integration, realized medium access control (Media Access Control, MAC) and physical layer transceiver (Physical Layer Transceiver PHY), uses network transformer with some passive elements single-chip microcomputer directly to be linked to each other with Ethernet.Ethernet module meets the regulation that connects all about twisted-pair wire net 10Base2T among the IEEE 802.3.It has realized Packet Filtering mechanism in inside, be used to limit the packet that imports into.And provide one to be used to the built-in dma module of realizing that rapid data is handled up and Hardware I P verification and calculating; 3 pilot lamp outputs that are used for display power supply and network activity also are provided in addition.
Performance parameter of the present utility model is as follows:
1, wide temperature humidity measurement range: temperature measurement range-40 ℃～+ 85 ℃, moisture measurement scope 0～100%RH;
2, temperature measurement accuracy: the measured temperature precision is ± 0.5 ℃ in the time of 25 ℃, is ± 0.9 ℃ at 0 to 40 ℃.Response time :≤20 seconds, resolution was 0.01 ℃;
3, moisture measurement precision: institute's hygrometric degree precision when 20% arrives 80%RH is ± 3.5%RH.Response time :≤4 seconds.Resolution is 0.03%RH;
4, networking inserts: possess ethernet communication, RS-422 point-to-point communication and RS-485 bus communication function; Can constitute long-range local humiture monitoring network;
5, microminiaturized profile: length * wide * height=78mm * 55mm * 17mm.
The utility model both can be used for temperature humidity and had measured, also can be used for the dew point measurement.
At military aspect, the humiture that can be used as military ground shelter and command post, vehicle and manned aircraft cabin detects, during the humiture of especially military ground radar electronics shelter, antenna rotating platform cavity, antenna array environment detects.Aspect civilian, can be used as the humiture monitoring of occasions such as central air conditioner, automobile, medical test and checkout equipment and place, accurate control scene, interior of building.
Claims (6)
1. networked temperature and humidity sensing transmitter, comprise that single-chip microcomputer (1), Temperature Humidity Sensor (2), serial can be rewritten storer (3), isolated 422 transceivers (4), voltage-stabilized power supply circuit (5), network transformer (6), monitoring and reset circuit (7), clock circuit (8), it is characterized in that:
The I/O mouth that the I2C bus connects single-chip microcomputer (1) is passed through in the output of Temperature Humidity Sensor (2),
The network communication signal of single-chip microcomputer (1) is connected to Ethernet by network transformer (6),
The serial communication signal of single-chip microcomputer (1) is connected to isolates 422 transceivers (4),
Serial can be rewritten the I/O mouth that storer (3) is connected to single-chip microcomputer (1),
Monitoring and reset circuit (7) is connected with single-chip microcomputer respectively with clock circuit (8),
Voltage-stabilized power supply circuit (5) connects single-chip microcomputer (1) and provides power supply to it.
2. networked temperature and humidity sensing transmitter as claimed in claim 1 is characterized in that: described single-chip microcomputer (1) adopts the networked single-chip microcomputer PIC18F97J60 of Microchip.
3. networked temperature and humidity sensing transmitter as claimed in claim 1 is characterized in that: described Temperature Humidity Sensor (2) adopts the integrated sensor of SHT11.
4. networked temperature and humidity sensing transmitter as claimed in claim 1 is characterized in that: it is CAT93C46 that described serial can be rewritten storer (3) model.
5. networked temperature and humidity sensing transmitter as claimed in claim 1 is characterized in that: described isolation 422 transceivers (4) adopt ADM2490.
6. networked temperature and humidity sensing transmitter as claimed in claim 1 is characterized in that: described voltage-stabilized power supply circuit (5) adopts the MIC37501 device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920186958.9U CN201476884U (en) | 2009-08-14 | 2009-08-14 | Networked temperature and humidity sensor transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920186958.9U CN201476884U (en) | 2009-08-14 | 2009-08-14 | Networked temperature and humidity sensor transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201476884U true CN201476884U (en) | 2010-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920186958.9U Expired - Lifetime CN201476884U (en) | 2009-08-14 | 2009-08-14 | Networked temperature and humidity sensor transmitter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155891A (en) * | 2014-07-03 | 2014-11-19 | 华南理工大学 | I<2>C-based networked transmitter and communication implementation method thereof |
| CN107179725A (en) * | 2017-07-17 | 2017-09-19 | 中国华电科工集团有限公司 | A kind of intelligent transfer device |
| CN110887869A (en) * | 2019-11-29 | 2020-03-17 | 苏业梅 | KYN type high-voltage board dew point detection circuitry |
-
2009
- 2009-08-14 CN CN200920186958.9U patent/CN201476884U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155891A (en) * | 2014-07-03 | 2014-11-19 | 华南理工大学 | I<2>C-based networked transmitter and communication implementation method thereof |
| CN107179725A (en) * | 2017-07-17 | 2017-09-19 | 中国华电科工集团有限公司 | A kind of intelligent transfer device |
| CN110887869A (en) * | 2019-11-29 | 2020-03-17 | 苏业梅 | KYN type high-voltage board dew point detection circuitry |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100519 |
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| CX01 | Expiry of patent term |