CN103606000A - RFID temperature and humidity sensor tag - Google Patents
RFID temperature and humidity sensor tag Download PDFInfo
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- CN103606000A CN103606000A CN201310497405.6A CN201310497405A CN103606000A CN 103606000 A CN103606000 A CN 103606000A CN 201310497405 A CN201310497405 A CN 201310497405A CN 103606000 A CN103606000 A CN 103606000A
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Abstract
An RFID temperature and humidity sensor tag is provided. The RFID temperature and humidity sensor tag is composed of a button cell, an MCURF circuit, a temperature and humidity sensor, a voltage monitoring unit, an electromagnetic starting circuit, a magnet, a wake-up circuit and an antenna.
Description
Technical field
The present invention relates to a kind of RFID temperature and humidity sensing label.
Background technology
The data of environment have great significance as a large class of comprehensive perception, by the research and development of environmentally sensitive terminal, can monitor in real time the state of the humiture of perform region.And can regulate and arrange cycle and the frequency that label gathers humiture according to the difference of rig-site utilization environment, when tested value surpasses bound alarm threshold value, can realize and send in several ways alerting signal.
Summary of the invention
A kind of RFID temperature and humidity sensing label is comprised of button cell, MCU RF chip, Temperature Humidity Sensor, voltage monitoring, electromagnetic start circuit, magnet piece, wake-up circuit and antenna.Button cell is connected to the positive and negative electrode circuit of PCB circuit board by battery leg.MCU RF circuit is connected with sensor, and described antenna is comprised of 2.G PCB antenna.Button cell is comprised of CR2530 button cell, and for energy is provided, its operating voltage is 1.4-3.3V.MCU RF circuit is comprised of Si4010.Sensor is comprised of environment temperature high-precision sensor SSH501, adopts difference ladder compensation characteristic temperature methods, and precision can reach 0.01 degree.Electromagnetic start circuit is comprised of normally closed electromagnetic switch, and by its close magnet piece, by its disconnecting circuit, when label leaves magnet piece, label is worked immediately.Voltage monitoring, is regularly detected by electric resistance partial pressure, and when voltage becomes and sends interrupting information during lower than 1.7 volt, this information exchange is crossed MCU and sent, and allows system alert user change label.Wake-up circuit regulates cycle and the interval that label collecting temperature and transmitting are set according to actual application environment.
Temperature-humidity monitoring image data flow process, MCU RF circuit first sends control command to Temperature Humidity Sensor, then waits for and accepts data, after receiving humiture data, returns to Temperature Humidity Sensor order, then closes Temperature Humidity Sensor.MCU RF circuit carries out difference and nonlinear gradient Compensation Analysis to the humiture data that receive, and makes precision can reach 0.0125 degree.
Accompanying drawing explanation
Fig. 1 is sensing label structural drawing of the present invention.
Fig. 2 is sensor of the present invention and MCU RF connection layout.
Fig. 3 is control command code table of the present invention.
Fig. 4 is temperature acquisition process flow diagram of the present invention.
Embodiment
Active RFID works in 2.4G frequency range, the energy of label work is provided by button cell, battery, MCU RF, electromagnetic start circuit, voltage monitoring, Temperature Humidity Sensor form active electronic label together with antenna, the active mode that is different from passive radio frequency, last straight through setting photos and sending messages outside frequency range at battery altering.MCU RF circuit Software for Design based on variable dynamic time slot collision algorithm, reduced data collision, packet loss problem, improved channel utilization.Label hardware configuration as shown in Figure 1.
Traditional analog Temperature Humidity Sensor need to carry out complicated calibration and demarcation when measuring humiture, and need to design complicated signal conditioning circuit and analog to digital conversion circuit, is not easy to application.The digital temperature-humidity sensor with I2 C bus that SHT11Shi Switzerland Sensirion company produces, has the features such as the debugging of exempting from, non-calibrating, Measurement Resolution programmable regulating (8/ 12/ 14 bit data), CRC transfer check, extra small package dimension; Simultaneously integrated Temperature Humidity Sensor, can carry out the moisture measurement of temperature compensation, and high-quality calculation function is provided, and measuring accuracy is high, if Fig. 2 is the connection layout with MCU RC circuit.
design of System Software
The instruction set of SHT11 is as shown below.When instruction starts, need to send the initialization that one group of startup command represents data transmission, be presented as when SCK clock is high level, DATA is low level by high level upset, and then SCK becomes low level, is subsequently when SCK clock is high level, and DATA upset is high level.Startup command is sent, and sends control command, and control command comprises 3 address bits and 5 command bits, as shown in Fig. 3.
measuring process
Temperature-humidity monitoring station image data flow process as shown in Figure 4, sends after startup command and control command, and MCU will wait end to be measured, and this process approximately needs 11/ 55/ 210 ms, and corresponding 8/ 12/ 14 bit measure respectively.SHT11 represents that to low level measurement finishes by drop-down DATA, and MCU must wait for and be somebody's turn to do " data are ready for signal " before triggering SCK clock.SHT11 then transmits the measurement data of 2B and the CRC parity check code of 1 B.MCU need to be that low level is confirmed each byte by drop-down DATA.All data are from MSB (highest significant position), and r value effectively (for example, for 14 bit data, be can be regarded as MSB from the 3rd SCK clock; And for 8 bit data, first byte is meaningless).Confirmation position with CRC data shows sign off.If do not use CRC-8 verification, controller can be after measured value LSB, by keeping acknowledgement bit ACK high level to carry out abort communication.After measurement and sign off, SHT11 proceeds to park mode automatically.For guaranteeing that self temperature rise is lower than 0. 1 ℃, the activationary time of SHT11 surpasses 15 % (for example, for 12 bit precision measures, per second carry out at most 3 times measure).
Finally by wireless transport module, being transferred to receiving end analyzes and processes.
Claims (8)
1. a RFID temperature and humidity sensing label is comprised of button cell, MCU RF chip, Temperature Humidity Sensor, voltage monitoring, electromagnetic start circuit, magnet piece, wake-up circuit and antenna.
2. button cell as claimed in claim 1 is connected to the positive and negative electrode circuit of PCB circuit board by battery leg, and described MCU RF circuit is connected with sensor, and described antenna is comprised of 2.G PCB antenna.
3. button cell as claimed in claim 1 is comprised of CR2530 button cell, and for energy is provided, its operating voltage is 1.4-3.3V.
4. MCU RF circuit as claimed in claim 1 is comprised of Si4010.
5. sensor as claimed in claim 1 is comprised of environment temperature high-precision sensor SSH501, adopts difference ladder compensation characteristic temperature methods, and precision can reach 0.01 degree.
6. electromagnetic start circuit as claimed in claim 1 is comprised of normally closed electromagnetic switch, and by its close magnet piece, by its disconnecting circuit, when label leaves magnet piece, label is worked immediately.
7. voltage monitoring as claimed in claim 1, is regularly detected by electric resistance partial pressure, and when voltage becomes and sends interrupting information during lower than 1.7 volt, this information exchange is crossed MCU and sent, and allows system alert user change label.
8. wake-up circuit as claimed in claim 1 regulates cycle and the interval that label collecting temperature and transmitting are set according to actual application environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497405.6A CN103606000A (en) | 2013-10-21 | 2013-10-21 | RFID temperature and humidity sensor tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310497405.6A CN103606000A (en) | 2013-10-21 | 2013-10-21 | RFID temperature and humidity sensor tag |
Publications (1)
| Publication Number | Publication Date |
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| CN103606000A true CN103606000A (en) | 2014-02-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310497405.6A Pending CN103606000A (en) | 2013-10-21 | 2013-10-21 | RFID temperature and humidity sensor tag |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292370A (en) * | 2016-09-13 | 2017-01-04 | 广东工业大学 | A kind of wireless sensor node |
| CN106370230A (en) * | 2016-09-13 | 2017-02-01 | 广东工业大学 | Wireless humiture sensor node |
| CN106529649A (en) * | 2016-12-28 | 2017-03-22 | 杭州浙港智能科技有限公司 | Electronic tag with magnetic suction type power supply |
| CN108154673A (en) * | 2016-12-06 | 2018-06-12 | 罗伯特·博世有限公司 | The method of the measured value of transmission sensor, machine readable storage medium and sensor |
| CN108957196A (en) * | 2018-08-24 | 2018-12-07 | 深圳拓邦股份有限公司 | A kind of battery pack detection circuit for access, method and charging unit |
| US11815504B2 (en) * | 2016-07-11 | 2023-11-14 | Quipip, Llc | Sensor device, and systems and methods for obtaining measurements of selected characteristics of a concrete mixture |
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| US20060055531A1 (en) * | 2004-09-14 | 2006-03-16 | Honeywell International, Inc. | Combined RF tag and SAW sensor |
| CN102222258A (en) * | 2011-05-18 | 2011-10-19 | 复旦大学无锡研究院 | Ultra-low-power-consumption intelligent wireless sensor tag for intelligent package |
| CN102306324A (en) * | 2011-08-11 | 2012-01-04 | 杭州师范大学 | Active RFID (radio frequency identification) patient temperature monitoring label |
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2013
- 2013-10-21 CN CN201310497405.6A patent/CN103606000A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060055531A1 (en) * | 2004-09-14 | 2006-03-16 | Honeywell International, Inc. | Combined RF tag and SAW sensor |
| CN102222258A (en) * | 2011-05-18 | 2011-10-19 | 复旦大学无锡研究院 | Ultra-low-power-consumption intelligent wireless sensor tag for intelligent package |
| CN102306324A (en) * | 2011-08-11 | 2012-01-04 | 杭州师范大学 | Active RFID (radio frequency identification) patient temperature monitoring label |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11815504B2 (en) * | 2016-07-11 | 2023-11-14 | Quipip, Llc | Sensor device, and systems and methods for obtaining measurements of selected characteristics of a concrete mixture |
| CN106292370A (en) * | 2016-09-13 | 2017-01-04 | 广东工业大学 | A kind of wireless sensor node |
| CN106370230A (en) * | 2016-09-13 | 2017-02-01 | 广东工业大学 | Wireless humiture sensor node |
| CN106292370B (en) * | 2016-09-13 | 2018-12-14 | 广东工业大学 | A kind of wireless sensor node |
| CN108154673A (en) * | 2016-12-06 | 2018-06-12 | 罗伯特·博世有限公司 | The method of the measured value of transmission sensor, machine readable storage medium and sensor |
| CN106529649A (en) * | 2016-12-28 | 2017-03-22 | 杭州浙港智能科技有限公司 | Electronic tag with magnetic suction type power supply |
| CN108957196A (en) * | 2018-08-24 | 2018-12-07 | 深圳拓邦股份有限公司 | A kind of battery pack detection circuit for access, method and charging unit |
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Application publication date: 20140226 |
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