CN103308240B - High-precision digital air pressure measuring circuit based on industrial 485 bus - Google Patents
High-precision digital air pressure measuring circuit based on industrial 485 bus Download PDFInfo
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Abstract
The invention relates to a high-precision digital air pressure measuring circuit based on an industrial 485 bus, which comprises a digital pressure sensor chip, a single chip microcomputer, a digital 485 interface chip and a direct current-to-direct current switch chip, wherein the single chip microcomputer is connected with the digital pressure sensor chip; the digital pressure sensor chip is connected with the single chip microcomputer through an I2C bus, the single chip microcomputer is connected with the digital 485 interface chip through serial port lines TXD, RXD and direction control Torr, the 485 interface chip is connected with a 485 interface, and the direct current-to-direct current switch chip is connected with a power supply to realize voltage reduction and then provide power for the digital pressure sensor chip, the single chip microcomputer and the digital 485 interface chip. The invention has the advantages of low cost, high consistency, simple relative analog realization circuit and good stability, and has strong relative anti-interference performance because the transmission is mainly carried out by digital signals.
Description
Technical field
The present invention relates to a kind of barometric surveying circuit, specifically a kind of high accuracy number barometric surveying circuit based on industrial 485 buses.
Background technology
Traditional sensor circuit not only needs highly sensitive sensor, and in order to ensure higher precision, need many mimic channels as anti-interference process, and need more device to amplify process as filtering process and signal, because the consistance of analog device own is poor, therefore the consistance of finished product is also relatively poor, in order to ensure that stability needs to carry out comparatively complicated calibration operation.Be difficult to carry out modular applications in industrial system.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, and provide a kind of high accuracy number barometric surveying circuit based on industrial 485 buses, cost is very low, and consistance is high, and relative analog realizing circuit is simple, and stable type is good, relative strong interference immunity.
The technical scheme that the present invention solves above technical matters is:
Based on a high accuracy number barometric surveying circuit for industrial 485 buses, comprise digital pressure sensor chip, single-chip microcomputer, digital 485 interface chips and DC-DC switch chip; Digital pressure sensor chip is connected with single-chip microcomputer by I2C bus, single-chip microcomputer is by Serial Port Line TXD, RXD and direction controlling TorR is connected with digital 485 interface chips, numeral 485 interface chips are connected to 485 interfaces, DC-DC switch chip be connected with power supply realize step-down after provide power supply to described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips.
In technical solution of the present invention, digital pressure sensor chip is MS5611 chip U1, and single-chip microcomputer is PIC16F876A chip U2, and digital 485 interface chips are SN65HVD11 chip U3, and DC-DC switch chip is 34063 chip U4; After adopting above concrete model chip, circuit of the present invention specifically connects as follows:
The pin 1 and 2 of MS5611 chip U1 all meets power supply signal VCC_3.3V, pin 3,4 and 5 all connects power supply earth signal, pin 6 is unsettled, pin 7 is by meeting power supply signal VCC_3.3V after connecting resistance R2 pull-up, and be connected with the SDA signal end of the I2C interface of PIC16F876A chip U2, pin 8 by meeting power supply signal VCC_3.3V after connecting resistance R1 pull-up, and is connected with the SCL signal end of the I2C interface of PIC16F876A chip U2;
The pin 14 of PIC16F876A chip U2 is connected with the SCL signal end of MS5611 chip U1, pin 15 is connected with the SDA signal end of MS5611 chip U1, pin 16 is connected with the transmitting-receiving control signal end DE of described SN65HVD11 chip U3, pin 17 is connected with the TX signal end of SN65HVD11 chip U3, pin 18 is connected with the RX signal end of SN65HVD11 chip U3, pin 9 is by electric capacity C4 ground connection, and receive pin 10 by transistor XT1, pin 10 is by electric capacity C5 ground connection and connect pin 9 by transistor XT1, pin 1 is reset signal end, and be connected to power supply signal VCC_3.3V by resistance R3, and be connected to power supply earth signal by electric capacity C6, pin 8 and pin 19 all connect power supply earth signal, pin 24 connects the pin 6 of programming interface J1, pin 27 connects the pin 5 of programming interface J1, pin 28 connects the pin 4 of programming interface J1, the negative electrode of pin 7 sending and receiving optical diode D1, the anode of light emitting diode D1 meets power supply signal VCC_3.3V by resistance R4, pin 20 meets power supply signal VCC_3.3V, and by electric capacity C2 ground connection,
The pin 1 of SN65HVD11 chip U3 is connected with the pin 18 of PIC16F876A chip U2, pin 2 is direction controlling pin with pin 3 short circuit and is connected with the pin 16 of PIC16F876A chip U2, pin 4 is connected with the pin 17 of PIC16F876A chip U2, pin 5 connects power supply earth signal, pin 6 is by being connected to power supply signal VCC_3.3V after connecting resistance R7 pull-up, and connect the pin 7 of SN65HVD11 chip U3 by resistance R9 by the pin 3 that resistance R5 receives external interface J2 simultaneously, pin 7 receives power supply earth signal by resistance R8, and connect the pin 6 of SN65HVD11 chip U3 by resistance R9 by the pin 2 that resistance R6 receives external interface J2 simultaneously, pin 8 meets power supply signal VCC_3.3V and connects power supply earth signal by electric capacity C3, the pin 1 of external interface J2 connects power supply earth signal,
The pin 1 of 34063 chip U4 and pin 7 and pin 8 short circuit are also connected to pin 6 by resistance R12, pin 2 is connected with the negative electrode of diode D3, the anode of diode D3 connects power supply earth signal and receives power output signal VCC_3.3V by inductance L 1 simultaneously, electric capacity C9 and electric capacity C10 is also connected in power supply signal VCC_3.3V and power supply earth signal, pin 3 connects power supply earth signal by electric capacity C8, pin 4 connects power supply earth signal, pin 5 connects power supply earth signal by resistance R11 and meets power output signal VCC_3.3V by resistance R10 simultaneously, the negative electrode that pin 6 meets diode D2 connects the positive pole of electric capacity C7 simultaneously, the anode of diode D2 connects power supply input signal, the negative pole of electric capacity C7 connects power supply earth signal.
The digital air pressure sensor chip of MS5611 is a a high resolving power baroceptor possessing spi bus and iic bus released by the MSAS company of Switzerland, resolution can reach 10 centimetres, comprise the position analog to digital converter of the pressure transducer of a High Linear and 24 of a super low-power consumption, therefore chip provides accurate 24 bit digital force value and temperature values, and the measured value of different accuracy can be provided according to demand, possesses the conversion efficiency that can complete in efficient 1ms, height can be realized, the function of thermometer, can be connected with microprocessor chip by SPI or IIC interface, and whole chip volume only has 5mm*3mm*1mm, be easy to be integrated among circuit.The basic characteristics of MS5611: ceramic package; Operating temperature range :-40 DEG C-85 DEG C; Resolution; Operating voltage: 1.8V-3.6V; Measurement range: 10-1200mbar; Degree of accuracy: at 25 DEG C, during 750mbar ± 1.5mbar; Welding manner: Surface Mount welds.
The access way of MCU can pass through IIC or SPI interface, and the present invention uses IIC interface, because relative to SPI interface, IIC interface only need take MCU two I/O mouths.
The present invention uses RS485 bus, because in general industry occasion, when requiring communication distance far away, widely use RS485 bus, because RS485 bus balance sends, differential received, therefore the ability of very strong suppression common mode interference is possessed, and because transceiver sensitivity is high, the voltage of 200mv can be detected, therefore source signal can be recovered outside a km, and RS485 bus possesses parallel function, multiple sending and receiving end can be connected in parallel in two buses and use, and can improve the utilization ratio of bus.
The invention has the beneficial effects as follows: cost of the present invention is very low, and consistance is high, relative analog realizing circuit is simple, and stable type is good, because transmission is mainly through digital data transmission, and relative strong interference immunity; Because signal has the digital-to-analog conversion of 24, therefore precision is high again, can be fairly simple realize high sensitivity and highdensity data acquisition, and in multiple platform, comparatively can realize the application of module in different system simply by protocol modification due to the existence of MCU.
Accompanying drawing explanation
Fig. 1 is that circuit of the present invention connects block diagram.
Fig. 2 is the circuit connection diagram of digital gas pressure sensor chip.
Fig. 3 is the circuit connection diagram of single-chip microcomputer.
Fig. 4 is the circuit connection diagram of digital 485 interface chips.
Fig. 5 is the circuit connection diagram of DC-DC switch chip.
Embodiment
embodiment 1
The present embodiment is a kind of high accuracy number barometric surveying circuit based on industrial 485 buses, and total connection block diagram as shown in Figure 1, comprises digital pressure sensor chip, single-chip microcomputer, digital 485 interface chips and DC-DC switch chip; Digital pressure sensor chip is connected with single-chip microcomputer by I2C bus, single-chip microcomputer is by Serial Port Line TXD, RXD and direction controlling TorR is connected with digital 485 interface chips, numeral 485 interface chips are connected to 485 interfaces, DC-DC switch chip be connected with power supply realize step-down after provide power supply to described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips.In this enforcement, digital pressure sensor chip is MS5611 chip U1, and single-chip microcomputer is PIC16F876A chip U2, and digital 485 interface chips are SN65HVD11 chip U3, and DC-DC switch chip is 34063 chip U4.
After adopting above concrete model chip, the circuit of this enforcement specifically connects as follows:
The circuit of digital gas pressure sensor chip connects as shown in Figure 2, the pin 1 and 2 of MS5611 chip U1 all meets power supply signal VCC_3.3V, the pin 3 of MS5611 chip U1, 4 and 5 all connect power supply earth signal, the pin 6 of MS5611 chip U1 is unsettled, the pin 7 of MS5611 chip U1 is by meeting power supply signal VCC_3.3V after connecting resistance R2 pull-up, and be connected with the SDA signal end of the I2C interface of PIC16F876A chip U2, the pin 8 of MS5611 chip U1 is by meeting power supply signal VCC_3.3V after connecting resistance R1 pull-up, and be connected with the SCL signal end of the I2C interface of PIC16F876A chip U2.
The circuit of single-chip microcomputer connects as shown in Figure 3, the pin 14 of PIC16F876A chip U2 is connected with the SCL signal end of MS5611 chip U1, the pin 15 of PIC16F876A chip U2 is connected with the SDA signal end of MS5611 chip U1, the pin 16 of PIC16F876A chip U2 is connected with the transmitting-receiving control signal end DE of SN65HVD11 chip U3, the pin 17 of PIC16F876A chip U2 is connected with the TX signal end of SN65HVD11 chip U3, the pin 18 of PIC16F876A chip U2 is connected with the RX signal end of SN65HVD11 chip U3, the pin 9 of PIC16F876A chip U2 is by electric capacity C4 ground connection, and receive pin 10 by transistor XT1, the pin 10 of PIC16F876A chip U2 is by electric capacity C5 ground connection and connect the pin 9 of PIC16F876A chip U2 by transistor XT1, the pin 1 of PIC16F876A chip U2 is reset signal end, and be connected to power supply signal VCC_3.3V by resistance R3, and be connected to power supply earth signal by electric capacity C6, pin 8 and the pin 19 of PIC16F876A chip U2 all connect power supply earth signal, the pin 24 of PIC16F876A chip U2 connects the pin 6 of programming interface J1, the pin 27 of PIC16F876A chip U2 connects the pin 5 of programming interface J1, the pin 28 of PIC16F876A chip U2 connects the pin 4 of programming interface J1, the negative electrode of the pin 7 sending and receiving optical diode D1 of PIC16F876A chip U2, the anode of light emitting diode D1 meets power supply signal VCC_3.3V by resistance R4, the pin 20 of PIC16F876A chip U2 meets power supply signal VCC_3.3V, and by electric capacity C2 ground connection.
The circuit of numeral 485 interface chips connects as shown in Figure 4, the pin 1 of SN65HVD11 chip U3 is connected with the pin 18 of PIC16F876A chip U2, the pin 2 of SN65HVD11 chip U3 is direction controlling pin with pin 3 short circuit and is connected with the pin 16 of PIC16F876A chip U2, the pin 4 of SN65HVD11 chip U3 is connected with the pin 17 of PIC16F876A chip U2, SN65HVD11 chip U3 pin 5 connects power supply earth signal, the pin 6 of SN65HVD11 chip U3 is by being connected to power supply signal VCC_3.3V after connecting resistance R7 pull-up, and connect the pin 7 of SN65HVD11 chip U3 by resistance R9 by the pin 3 that resistance R5 receives external interface J2 simultaneously, the pin 7 of SN65HVD11 chip U3 receives power supply earth signal by resistance R8, and connect the pin 6 of SN65HVD11 chip U3 by resistance R9 by the pin 2 that resistance R6 receives external interface J2 simultaneously, the pin 8 of SN65HVD11 chip U3 meets power supply signal VCC_3.3V and connects power supply earth signal by electric capacity C3, the pin 1 of external interface J2 connects power supply earth signal.
The circuit of DC-DC switch chip connects as shown in Figure 5, the pin 1 of 34063 chip U4 and pin 7 and pin 8 short circuit are also connected to the pin 6 of 34063 chip U4 by resistance R12, the pin 2 of 34063 chip U4 is connected with the negative electrode of diode D3, the anode of diode D3 connects power supply earth signal and receives power output signal VCC_3.3V by inductance L 1 simultaneously, electric capacity C9 and electric capacity C10 is also connected in power supply signal VCC_3.3V and power supply earth signal, the pin 3 of 34063 chip U4 connects power supply earth signal by electric capacity C8, the pin 4 of 34063 chip U4 connects power supply earth signal, the pin 5 of 34063 chip U4 connects power supply earth signal by resistance R11 and meets power output signal VCC_3.3V by resistance R10 simultaneously, the negative electrode that the pin 6 of 34063 chip U4 meets diode D2 connects the positive pole of electric capacity C7 simultaneously, the anode of diode D2 connects power supply input signal, the negative pole of electric capacity C7 connects power supply earth signal.
The present embodiment relative analog realizing circuit is simple, and stable type is good, because transmission is mainly through digital data transmission, and relative strong interference immunity; Because signal has the digital-to-analog conversion of 24, therefore precision is high again, can be fairly simple realize high sensitivity and highdensity data acquisition, and in multiple platform, comparatively can realize the application of module in different system simply by protocol modification due to the existence of MCU.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (1)
1., based on a high accuracy number barometric surveying circuit for industrial 485 buses, comprise digital pressure sensor chip, single-chip microcomputer, digital 485 interface chips and DC-DC switch chip; Described digital pressure sensor chip is connected with single-chip microcomputer by I2C bus, described single-chip microcomputer is by Serial Port Line TXD, RXD and direction controlling TorR is connected with described digital 485 interface chips, described digital 485 interface chips are connected to 485 interfaces, described DC-DC switch chip be connected with power supply realize step-down after give described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips power supply is provided;
It is characterized in that: described digital pressure sensor chip is MS5611 chip U1, described single-chip microcomputer is PIC16F876A chip U2, and described digital 485 interface chips are SN65HVD11 chip U3, and described DC-DC switch chip is 34063 chip U4;
The pin 1 and 2 of described MS5611 chip U1 all meets power supply signal VCC_3.3V, pin 3,4 and 5 all connects power supply earth signal, pin 6 is unsettled, pin 7 is by meeting power supply signal VCC_3.3V after connecting resistance R2 pull-up, and be connected with the SDA signal end of the I2C interface of PIC16F876A chip U2, pin 8 by meeting power supply signal VCC_3.3V after connecting resistance R1 pull-up, and is connected with the SCL signal end of the I2C interface of PIC16F876A chip U2;
The pin 14 of described PIC16F876A chip U2 is connected with the SCL signal end of described MS5611 chip U1, pin 15 is connected with the SDA signal end of described MS5611 chip U1, pin 16 is connected with the transmitting-receiving control signal end DE of described SN65HVD11 chip U3, pin 17 is connected with the TX signal end of described SN65HVD11 chip U3, pin 18 is connected with the RX signal end of described SN65HVD11 chip U3, pin 9 is by electric capacity C4 ground connection, and receive pin 10 by transistor XT1, pin 10 is by electric capacity C5 ground connection and connect pin 9 by transistor XT1, pin 1 is reset signal end, and be connected to power supply signal VCC_3.3V by resistance R3, and be connected to power supply earth signal by electric capacity C6, pin 8 and pin 19 all connect power supply earth signal, pin 24 connects the pin 6 of programming interface J1, pin 27 connects the pin 5 of programming interface J1, pin 28 connects the pin 4 of programming interface J1, the negative electrode of pin 7 sending and receiving optical diode D1, the anode of light emitting diode D1 meets power supply signal VCC_3.3V by resistance R4, pin 20 meets power supply signal VCC_3.3V, and by electric capacity C2 ground connection,
The pin 1 of described SN65HVD11 chip U3 is connected with the pin 18 of described PIC16F876A chip U2, pin 2 is direction controlling pin with pin 3 short circuit and is connected with the pin 16 of described PIC16F876A chip U2, pin 4 is connected with the pin 17 of described PIC16F876A chip U2, pin 5 connects power supply earth signal, pin 6 is by being connected to power supply signal VCC_3.3V after connecting resistance R7 pull-up, and connect the pin 7 of described SN65HVD11 chip U3 by resistance R9 by the pin 3 that resistance R5 receives external interface J2 simultaneously, pin 7 receives power supply earth signal by resistance R8, and connect the pin 6 of described SN65HVD11 chip U3 by resistance R9 by the pin 2 that resistance R6 receives external interface J2 simultaneously, pin 8 meets power supply signal VCC_3.3V and connects power supply earth signal by electric capacity C3, the pin 1 of external interface J2 connects power supply earth signal,
The pin 1 of described 34063 chip U4 and pin 7 and pin 8 short circuit are also connected to pin 6 by resistance R12, pin 2 is connected with the negative electrode of diode D3, the anode of diode D3 connects power supply earth signal and receives power output signal VCC_3.3V by inductance L 1 simultaneously, electric capacity C9 and electric capacity C10 is also connected in power supply signal VCC_3.3V and power supply earth signal, pin 3 connects power supply earth signal by electric capacity C8, pin 4 connects power supply earth signal, pin 5 connects power supply earth signal by resistance R11 and meets power output signal VCC_3.3V by resistance R10 simultaneously, the negative electrode that pin 6 meets diode D2 connects the positive pole of electric capacity C7 simultaneously, the anode of diode D2 connects power supply input signal, the negative pole of electric capacity C7 connects power supply earth signal.
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| CN201310196760.XA CN103308240B (en) | 2013-05-22 | 2013-05-22 | High-precision digital air pressure measuring circuit based on industrial 485 bus |
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| CN201310196760.XA CN103308240B (en) | 2013-05-22 | 2013-05-22 | High-precision digital air pressure measuring circuit based on industrial 485 bus |
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| CN105181238B (en) * | 2015-06-04 | 2018-08-17 | 苏州科技学院 | A kind of ceramic pressure sensor zero range regulating device |
| CN109186816A (en) * | 2018-10-24 | 2019-01-11 | 中北大学 | A kind of microminiature digital pressure sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457587Y (en) * | 2000-10-26 | 2001-10-31 | 南京供电局 | Insulation gas pressure monitor |
| CN102706510A (en) * | 2012-06-18 | 2012-10-03 | 辽宁省电力有限公司沈阳供电公司 | System and method for monitoring and statistically analyzing SF6 gas pressure of transformer substation |
| CN102778327A (en) * | 2012-07-05 | 2012-11-14 | 西安交通大学 | High-performance intelligent sensor digital transmitting system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2457587Y (en) * | 2000-10-26 | 2001-10-31 | 南京供电局 | Insulation gas pressure monitor |
| CN102706510A (en) * | 2012-06-18 | 2012-10-03 | 辽宁省电力有限公司沈阳供电公司 | System and method for monitoring and statistically analyzing SF6 gas pressure of transformer substation |
| CN102778327A (en) * | 2012-07-05 | 2012-11-14 | 西安交通大学 | High-performance intelligent sensor digital transmitting system |
Non-Patent Citations (2)
| Title |
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| 煤矿综采液压支架压力和顶板离层位移监测系统的研究;王燕霞;《中国优秀硕士虚伪论文全文数据库 工程科技Ⅰ辑》;20120215(第2期);B021-43 * |
| 赖贵川,黄华伟.基于MS5611-01BA01的高精度气压和温度检测系统涉及.《四川理工学院学报(自然科学版)》.2012,第25卷(第5期), * |
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