CN202916029U - Wireless pressure sensor - Google Patents
Wireless pressure sensor Download PDFInfo
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- CN202916029U CN202916029U CN 201220629015 CN201220629015U CN202916029U CN 202916029 U CN202916029 U CN 202916029U CN 201220629015 CN201220629015 CN 201220629015 CN 201220629015 U CN201220629015 U CN 201220629015U CN 202916029 U CN202916029 U CN 202916029U
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- pressure sensor
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Abstract
The utility model discloses a wireless pressure sensor. The wireless pressure sensor comprises a pressure detector, a calibration chip, an MCU and a wireless transmitting/receiving device; the pressure detector is used for detecting the effect of an external force on the wireless pressure sensor and converting generated pressure data into electrical signals; the calibration chip is used for converting the electrical signals into digital signals; the wireless transmitting/receiving device is used for receiving pressure data acquisition instructions from a base station and transmitting the digital signals to the base station; and the MCU is used for analyzing the pressure data acquisition instructions so as to start the pressure detector. The wireless pressure sensor of the utility model is advantageous in high efficiency, excellent real-time performance, low cost, convenient installation, favorable maintainability and easiness in realizing network-based management.
Description
Technical field
The utility model relates to a kind of wireless pressure sensor.
Background technology
In recent years, along with the development of China industry, agricultural and technological sciences technology especially mechanics of communication, the development of computer technology and sensor technology, particularly in the widespread use of pressure transducer in areas of information technology, also pressure sensor technique performance and index are had higher requirement.How the non electrical quantity that collects from the analog-and digital-measuring units such as pressure transducer and other measuring equipments or electric quantity signal are sent to and carry out data analysis and process in the host computer and become a difficult problem.The advantage of traditional wire transmission mode is that the quality of transmitting is reliable, acts charitably in real time, but data acquisition and the one-time investment of the finite element network that sets up is larger, and running into some environment, place with a varied topography is difficult to the construction of line.Make the system Construction difficulty of wire transmission large, the cycle is long, and cost is high, and operating cost is high, is vulnerable to destroy.
The utility model content
The technical problems to be solved in the utility model is in order to overcome the defective that line transmission system construction difficulty is large in the prior art, the cycle is long, cost is high, operating cost is high and be vulnerable to destroy, the wireless pressure sensor that a kind of efficient is high, real-time good, low-cost, the while is easy for installation, network management is got well and be easy to realize to maintainability to be provided.
The utility model solves above-mentioned technical matters by following technical proposals:
A kind of wireless pressure sensor, its characteristics be, it comprises a pressure detector, a calibration chip, a MCU(micro-control unit) and a wireless transmitter, wherein,
This pressure detector is converted to electric signal for detection of external force to the effect of this wireless pressure sensor and with the pressure data that produces;
This calibration chip is used for this electric signal is converted to digital signal;
This wireless transmitter is used for reception and is sent to this base station from the pressure data acquisition instructions of a base station and with this digital signal;
This MCU is used for resolving this pressure data acquisition instructions to enable this pressure detector.
Preferably, this pressure detector comprises a diffuse si core body, this diffuse si core body comprises a shell, a diffused-silicon pressure sensitive chip, diaphragm and the silicone oil between this diffused-silicon pressure sensitive chip and this diaphragm, this shell has an opening, this diffused-silicon pressure sensitive chip is packaged in this shell, this diaphragm is coated on this diffused-silicon pressure sensitive chip and is positioned at this opening part, and this diffused-silicon pressure sensitive chip detects the external force that acts on this diaphragm by this silicone oil.
Preferably, this calibration chip comprises differential amplifier, A/D(analog/digital) converter, DSP(Digital Signal Processing, digital signal processing), the EEPROM(EEPROM (Electrically Erasable Programmable Read Only Memo)) and analog electrical bridge switch.
Preferably, this calibration chip links to each other with this MCU by I2C bus (by the twin wire universal serial bus of PHILIPS company exploitation), and/or this wireless transmitter is by the SPI(Serial Peripheral Interface (SPI)) link to each other with this MCU.
Preferably, this MCU is msp430 chip (the MSP430 series monolithic is Texas Instruments (TI) a kind of 16 super low-power consumptions of beginning to introduce to the market in 1996, the mixed-signal processor with reduced instruction set computer (RISC)).
Preferably, this wireless transmitter is nRF905 chip (nRF905 monolithic wireless transceiver is the monolithic radio frequency emitter chip that Norway Nordic company releases).
On the basis that meets this area general knowledge, above-mentioned each optimum condition, but combination in any namely get each preferred embodiments of the utility model.
Positive progressive effect of the present utility model is: wireless pressure sensor phase efficient of the present utility model is high, real-time good, low-cost, the while is easy for installation, maintainability is good and be easy to realize network management.(ARM(ARM with powerful processing power is an esbablished corporation of microprocessor industry for the data acquisition calibration chip of this wireless low-power consumption pressure transducer employing low power consumption high-precision and high precision diffuse si core body, low-power consumption MCU and base station, designed large quantity high performance, cheapness, low risc processor, correlation technique and the software of power consumption) center processor), and mature and stable wireless transport module forms, has precision high, slewing rate is fast, can and be easy to intensive data management and analysis to the collection of multiple spot pressure data and data transmission.Use simultaneously special chip, guaranteed stability, high precision and low-power consumption that data are gathered.This just so that the data acquisition take single-chip microcomputer as core be widely used.Also have simultaneously and safeguard simply, easy for installation, the advantages such as low price.
Description of drawings
Fig. 1 is the structured flowchart of the wireless pressure sensor of the utility model one embodiment.
Fig. 2 is the process flow diagram of the pressure data acquisition method of the utility model one embodiment.
Embodiment
Mode below by embodiment further specifies the utility model, but therefore the utility model is not limited among the described scope of embodiments.
With reference to figure 1 and Fig. 2, wireless pressure sensor 1 described in the utility model comprises a pressure detector 11, a calibration chip 12, a MCU13 and a wireless transmitter 14, wherein,
This pressure detector 11 is converted to electric signal for detection of external force to the effect of this wireless pressure sensor and with the pressure data that produces;
This calibration chip 12 is used for this electric signal is converted to digital signal;
This wireless transmitter 14 is used for reception and is sent to this base station from the pressure data acquisition instructions of a base station and with this digital signal;
This MCU13 is used for resolving this pressure data acquisition instructions to enable this pressure detector 11.
Specifically, this pressure detector 11 comprises a diffuse si core body, this diffuse si core body comprises a shell, a diffused-silicon pressure sensitive chip, diaphragm and the silicone oil between this diffused-silicon pressure sensitive chip and this diaphragm, this shell has an opening, this diffused-silicon pressure sensitive chip is packaged in this shell, this diaphragm is coated on this diffused-silicon pressure sensitive chip and is positioned at this opening part, and this diffused-silicon pressure sensitive chip detects the external force that acts on this diaphragm by this silicone oil.
Wherein, this calibration chip 12 comprises differential amplifier, A/D converter, DSP, EEPROM and analog electrical bridge switch.
And this calibration chip 12 passes through I
2The C bus links to each other with this MCU13, and this wireless transmitter 14 links to each other with this MCU13 by SPI.
Comparatively commonly used, this MCU13 is the msp430 chip.And this wireless transmitter 14 is the nRF905 chip.
With reference to figure 2, pressure data acquisition method described in the utility model adopts wireless pressure sensor 1 as shown in Figure 1 to realize, this pressure data acquisition method may further comprise the steps:
Step S
1, this base station sends this pressure data acquisition instructions to this wireless pressure sensor;
Step S
2, this MCU resolves this pressure data acquisition instructions;
Step S
3, this pressure detector detects external force the effect of this wireless pressure sensor and pressure data that this external force is produced is converted to electric signal;
Step S
4, this calibration chip is converted to digital signal with this electric signal;
Step S
5, this wireless transmitter is sent to this base station with this digital signal.
Below, lift an application example, in conjunction with installation, use angle, again set forth wireless pressure sensor of the present utility model and pressure data acquisition method.
Wireless pressure sensor described in the utility model comprises diffuse si core body, (the diffuse si core body is made of diaphragm, stainless steel casing, silicon chip, lead-in wire and silicone oil) calibration chip, MCU and radio receiving transmitting module (nRF905), in use, this pressure transducer is communicated by letter with a base station (the STM32 chip of ARM core).The diffuse si core body is installed in the rapid-acting coupling of quick special use, with back-up ring and circlip for hole the diffuse si core body is fixed, and circuit carriers is placed on the circlip for hole, and the output of diffuse si core body is access in calibration chip, and calibration chip uses I
2The C bus links to each other with low-power consumption MCU, and radio receiving transmitting module links to each other with low-power consumption MCU by SPI, and the base station links to each other with radio receiving transmitting module by SPI.
The diffuse si core body is that to be encapsulated into 316L(316L be a kind of stainless steel material trade mark to diffused-silicon pressure sensitive chip (hereinafter to be referred as sensitive chip)) obtain in the stainless steel casing, impressed pressure is delivered on the sensitive chip by the silicone oil of stainless steel diaphragm, inner sealing, sensitive chip does not directly contact measured medium, the structure of whole solid state that mineralization pressure is measured, therefore can be applied to various occasions, comprise abominable Korrosionsmedium environment.Integrated differential amplifier on the calibration chip, high-precision a/d converter, high-speed data processor DSP, EEPROM and analog electrical bridge switch.Can change into corresponding digital signal to amount of pressure, and be below the 2 μ A at the standby mode current drain.What low-power consumption MCU adopted is msp430 series, has extremely low power consumption, STM32(STM32 series is based on aiming at the custom-designed kernel of the Embedded Application that requires high-performance, low cost, low-power consumption) what adopt is the ARM kernel, has that speed is fast, data-handling capacity is strong and low-cost advantage.Wireless transmitter adopts monolithic radio frequency transceiver nRF905, nRF905 is the product of Norway Nordic VLSI company, operating voltage is 1.9～3.6V, 32 pin QFN(quad flat non-pin package) encapsulation (5 * 5mm), work in 433MHz (industry, science and medical science) channel.The numerous areas such as nRF905 is applicable to wireless data communications, radio alarming and security system, wirelessly unblanks, wireless monitor, home automation and toy.NRF905 is a wireless data transceiving chip that integrated level is higher, comprise the modules such as power management, crystal oscillator, low noise amplifier, frequency synthesizer power amplifier in the sheet, can realize automatically processing prefix, CRC CRC and Manchester's cde/functions such as decoding, very easy to use.This wireless pressure sensor adopts current reasonable diffuse si core body as the sensed pressure device exactly, and it is the principle by piezoresistive effect, pressure is changed into the dc signal that can measure.Calibration chip is exported the digital signal of the pressure of current correspondence at output mode.The structure of this modular has reduced peripheral cell, has improved the stability of data acquisition.The digital signal that low-power consumption MCU reads sends data by radio receiving transmitting module.Receiving the base station, the radio receiving transmitting module of base station receives the force value of passing back from wireless pressure sensor, is forwarded to a PC(personal computer) machine.PC can be adjusted other equipment according to these pressure datas, shows that simultaneously these force value are on PC.Simultaneously can be to data analysis and processing, other equipment are being adjusted etc.
The principle of work of this wireless low-power consumption pressure transducer is as follows:
During diaphragm on pressure-acting and diffuse si core body are arranged, diaphragm generation deformation, silicone oil in the extruding diffuse si core body, because silicone oil can not be compressed, be applied to same pressure on the sensitive chip of diffuse si, the electric bridge that diffuse si is made occurs uneven, under the excitation in crossing current source, the differential electric signal of output mV level, the high-precision A/D (modulus) that this electric signal enters in the special chip converts digital signal to, is processing through the DSP data of special chip and digital signal corresponding to conversion output.The mode of passing through scanning of base station is carried out communication with every excess pressure sensor.At first the acquisition signal is sent in the base station, and acquisition is modulated to the 433MHz electromagnetic wave through data transmit-receive module, and the data transmit-receive module of wireless low-power consumption sensor out obtains digital signal to the radiowave demodulation, and then single-chip microcomputer is carried out corresponding acquisition.Read I
2The pressure on the number signal of C sends to the data transmission blocks modulation to the digital signal biography and sends, and the base station receives radiowave demodulation reading out data, uploads to PC and so circulates, and will constantly collect host computer to data, carries out data storage and analysis.
Although 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 various changes or modifications 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 (7)
1. a wireless pressure sensor is characterized in that, it comprises a pressure detector, a calibration chip, a MCU and a wireless transmitter, wherein,
This pressure detector is converted to electric signal for detection of external force to the effect of this wireless pressure sensor and with the pressure data that produces;
This calibration chip is used for this electric signal is converted to digital signal;
This wireless transmitter is used for reception and is sent to this base station from the pressure data acquisition instructions of a base station and with this digital signal;
This MCU is used for resolving this pressure data acquisition instructions to enable this pressure detector.
2. wireless pressure sensor as claimed in claim 1, it is characterized in that, this pressure detector comprises a diffuse si core body, this diffuse si core body comprises a shell, a diffused-silicon pressure sensitive chip, diaphragm and the silicone oil between this diffused-silicon pressure sensitive chip and this diaphragm, this shell has an opening, this diffused-silicon pressure sensitive chip is packaged in this shell, this diaphragm is coated on this diffused-silicon pressure sensitive chip and is positioned at this opening part, and this diffused-silicon pressure sensitive chip detects the external force that acts on this diaphragm by this silicone oil.
3. wireless pressure sensor as claimed in claim 1 or 2 is characterized in that, this calibration chip comprises differential amplifier, A/D converter, DSP, EEPROM and analog electrical bridge switch.
4. wireless pressure sensor as claimed in claim 1 or 2 is characterized in that, this calibration chip links to each other with this MCU by the I2C bus.
5. wireless pressure sensor as claimed in claim 1 or 2 is characterized in that, this wireless transmitter links to each other with this MCU by SPI.
6. wireless pressure sensor as claimed in claim 1 or 2 is characterized in that, this MCU is the msp430 chip.
7. wireless pressure sensor as claimed in claim 1 or 2 is characterized in that, this wireless transmitter is the nRF905 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629015 CN202916029U (en) | 2012-11-23 | 2012-11-23 | Wireless pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220629015 CN202916029U (en) | 2012-11-23 | 2012-11-23 | Wireless pressure sensor |
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| CN202916029U true CN202916029U (en) | 2013-05-01 |
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| CN 201220629015 Expired - Lifetime CN202916029U (en) | 2012-11-23 | 2012-11-23 | Wireless pressure sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837270A (en) * | 2012-11-23 | 2014-06-04 | 上海朝辉压力仪器有限公司 | Wireless pressure sensor and pressure data acquisition method |
| CN109967378A (en) * | 2018-12-30 | 2019-07-05 | 广州敏达包装设备有限公司 | A kind of belt squeeze formula hermetically sealed can detection device and method |
| CN112627670A (en) * | 2020-12-12 | 2021-04-09 | 中建科技集团有限公司 | Control method based on touch sensor and wireless anti-pinch device of automatic door |
-
2012
- 2012-11-23 CN CN 201220629015 patent/CN202916029U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837270A (en) * | 2012-11-23 | 2014-06-04 | 上海朝辉压力仪器有限公司 | Wireless pressure sensor and pressure data acquisition method |
| CN109967378A (en) * | 2018-12-30 | 2019-07-05 | 广州敏达包装设备有限公司 | A kind of belt squeeze formula hermetically sealed can detection device and method |
| CN112627670A (en) * | 2020-12-12 | 2021-04-09 | 中建科技集团有限公司 | Control method based on touch sensor and wireless anti-pinch device of automatic door |
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Granted publication date: 20130501 |
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| CX01 | Expiry of patent term |