CN103308240A - 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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- CN103308240A CN103308240A CN201310196760XA CN201310196760A CN103308240A CN 103308240 A CN103308240 A CN 103308240A CN 201310196760X A CN201310196760X A CN 201310196760XA CN 201310196760 A CN201310196760 A CN 201310196760A CN 103308240 A CN103308240 A CN 103308240A
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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 guarantee higher precision, need many mimic channels as anti-interference process, and need more device to amplify processing as filtering processing and signal, because the consistance of analog device own is poor, therefore the consistance of finished product is also relatively relatively poor, need to carry out comparatively complicated calibration operation in order to guarantee stability.In industrial system, be difficult to carry out modular applications.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of high accuracy number barometric surveying circuit based on industrial 485 buses is provided, and cost is very low, and consistance is high, and simulation realizes that circuit is simple relatively, and stable type is good, relatively strong interference immunity.
The technical scheme that the present invention solves above technical matters is:
A kind of high accuracy number barometric surveying circuit based on industrial 485 buses comprises digital pressure sensor chip, single-chip microcomputer, digital 485 interface chips and DC-DC switch chip; The digital pressure sensor chip is connected with single-chip microcomputer by the I2C bus, single-chip microcomputer is by Serial Port Line TXD, RXD and direction control TorR are connected with digital 485 interface chips, be connected to 485 interfaces on numeral 485 interface chips, the DC-DC switch chip is connected with power supply to be realized providing power supply to described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips after the step-down.
In the technical solution of the present invention, the 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 the DC-DC switch chip is 34063 chip U4; After adopting above concrete model chip, the concrete connection of circuit of the present invention is 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 the power supply earth signal, pin 6 is unsettled, pin 7 meets power supply signal VCC_3.3V after drawing on the connecting resistance R2, and the SDA signal end of I2C interface of being connected with PIC16F876A chip U2 connects, pin 8 meets power supply signal VCC_3.3V after drawing on the connecting resistance R1, and is connected the SCL signal end of I2C interface with PIC16F876A chip U2 and connects;
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 capacitor C 4 ground connection, and receive pin 10 by transistor XT1, pin 10 connects pin 9 by capacitor C 5 ground connection and by transistor XT1, pin 1 is the reset signal end, and be connected to power supply signal VCC_3.3V by resistance R 3, and be connected to the power supply earth signal by capacitor C 6, pin 8 and pin 19 all connect the 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 R 4, pin 20 meets power supply signal VCC_3.3V, and by capacitor C 2 ground connection;
The pin 1 of SN65HVD11 chip U3 is connected with the pin 18 of PIC16F876A chip U2, pin 2 is connected short circuit and is direction control pin and is connected with the pin 16 of PIC16F876A chip U2 with pin, pin 4 is connected with the pin 17 of PIC16F876A chip U2, pin 5 connects the power supply earth signal, pin 6 is connected to power supply signal VCC_3.3V after drawing on the connecting resistance R7, and connect simultaneously the pin 7 of SN65HVD11 chip U3 by resistance R 9 by the pin 3 that resistance R 5 is received external interface J2, pin 7 is received the power supply earth signal by resistance R 8, and connect simultaneously the pin 6 of SN65HVD11 chip U3 by resistance R 9 by the pin 2 that resistance R 6 is received external interface J2, pin 8 meets power supply signal VCC_3.3V and connects the power supply earth signal by capacitor C 3, and the pin 1 of external interface J2 connects the power supply earth signal;
The pin 1 of 34063 chip U4 and pin 7 and pin 8 short circuits also are connected to pin 6 by resistance R 12, pin 2 is connected with the negative electrode of diode D3, the anode of diode D3 connects the power supply earth signal and receives power supply output signal VCC_3.3V by inductance L 1 simultaneously, capacitor C 9 and capacitor C 10 also are connected in power supply signal VCC_3.3V and the power supply earth signal, pin 3 connects the power supply earth signal by capacitor C 8, pin 4 connects the power supply earth signal, pin 5 connects the power supply earth signal by resistance R 11 and meets power supply output signal VCC_3.3V by resistance R 10 simultaneously, the negative electrode that pin 6 meets diode D2 connects the positive pole of capacitor C 7 simultaneously, the anode of diode D2 connects power supply input signal, and the negative pole of capacitor C 7 connects the power supply earth signal.
The digital air pressure sensor chip of MS5611 is a a high resolving power baroceptor that possesses spi bus and iic bus by the MSAS company release of Switzerland, resolution can reach 10 centimetres, 24 the position analog to digital converter that comprises the pressure transducer of a high linearity and a super low-power consumption, therefore chip provides accurate 24 bit digital force value and temperature values, and can provide according to demand the measured value of different accuracy, possesses the conversion efficiency that to finish in the efficient 1ms, can realize height, the function of thermometer, can be connected with microprocessor chip by SPI or IIC interface, and whole chip volume only has 5mm*3mm*1mm, is easy to be integrated among the circuit.The basic characteristics of MS5611: ceramic package; Operating temperature range :-40 ℃-85 ℃; Resolution; Operating voltage: 1.8V-3.6V; Measurement range: 10-1200mbar; Degree of accuracy: at 25 ℃, during 750mbar ± 1.5mbar; Welding manner: Surface Mount welding.
The access way of MCU can be passed through IIC or SPI interface, and the present invention uses the IIC interface, because with respect to the SPI interface, the IIC interface only need take two I/O mouths of MCU.
The present invention uses the RS485 bus, because in the general industry occasion, in the situation that require communication distance far away, be widely used the RS485 bus, because RS485 bus balance sends, differential received, therefore the ability that possesses very strong inhibition common mode interference, and because transceiver sensitivity is high, can detect the voltage of 200mv, therefore can outside a km, can recover the source signal, and the RS485 bus possesses parallel function, and a plurality of sending and receiving ends can be connected in parallel on 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, and simulation realizes that circuit is simple relatively, and stable type is good, and is main by digital data transmission owing to transmitting, relatively strong interference immunity; Again because signal has 24 digital-to-analog conversion so precision high, realization high sensitivity that can be fairly simple and highdensity data acquisition, and because the existence of MCU can comparatively simply realize the application of module in different system by protocol modification in a plurality of platforms.
Description of drawings
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
The present embodiment is a kind of high accuracy number barometric surveying circuit based on industrial 485 buses, and total connection block diagram comprises digital pressure sensor chip, single-chip microcomputer, digital 485 interface chips and DC-DC switch chip as shown in Figure 1; The digital pressure sensor chip is connected with single-chip microcomputer by the I2C bus, single-chip microcomputer is by Serial Port Line TXD, RXD and direction control TorR are connected with digital 485 interface chips, be connected to 485 interfaces on numeral 485 interface chips, the DC-DC switch chip is connected with power supply to be realized providing power supply to described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips after the step-down.In this enforcement, the 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 the DC-DC switch chip is 34063 chip U4.
After adopting above concrete model chip, the concrete connection of the circuit of this enforcement is 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 the power supply earth signal, the pin 6 of MS5611 chip U1 is unsettled, the pin 7 of MS5611 chip U1 meets power supply signal VCC_3.3V after drawing on the connecting resistance R2, and the SDA signal end of I2C interface of being connected with PIC16F876A chip U2 connects, the pin 8 of MS5611 chip U1 meets power supply signal VCC_3.3V after drawing on the connecting resistance R1, and is connected the SCL signal end of I2C interface with PIC16F876A chip U2 and connects.
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 capacitor C 4 ground connection, and receive pin 10 by transistor XT1, the pin 10 of PIC16F876A chip U2 is by capacitor C 5 ground connection and connect the pin 9 of PIC16F876A chip U2 by transistor XT1, the pin 1 of PIC16F876A chip U2 is the reset signal end, and be connected to power supply signal VCC_3.3V by resistance R 3, and be connected to the power supply earth signal by capacitor C 6, pin 8 and the pin 19 of PIC16F876A chip U2 all connect the 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 R 4, the pin 20 of PIC16F876A chip U2 meets power supply signal VCC_3.3V, and by capacitor C 2 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 connected short circuit and is direction control pin and is connected with the pin 16 of PIC16F876A chip U2 with pin, the pin 4 of SN65HVD11 chip U3 is connected with the pin 17 of PIC16F876A chip U2, SN65HVD11 chip U3 pin 5 connects the power supply earth signal, the pin 6 of SN65HVD11 chip U3 is connected to power supply signal VCC_3.3V after drawing on the connecting resistance R7, and connect simultaneously the pin 7 of SN65HVD11 chip U3 by resistance R 9 by the pin 3 that resistance R 5 is received external interface J2, the pin 7 of SN65HVD11 chip U3 is received the power supply earth signal by resistance R 8, and connect simultaneously the pin 6 of SN65HVD11 chip U3 by resistance R 9 by the pin 2 that resistance R 6 is received external interface J2, the pin 8 of SN65HVD11 chip U3 meets power supply signal VCC_3.3V and connects the power supply earth signal by capacitor C 3, and the pin 1 of external interface J2 connects the 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 circuits also are connected to the pin 6 of 34063 chip U4 by resistance R 12, the pin 2 of 34063 chip U4 is connected with the negative electrode of diode D3, the anode of diode D3 connects the power supply earth signal and receives power supply output signal VCC_3.3V by inductance L 1 simultaneously, capacitor C 9 and capacitor C 10 also are connected in power supply signal VCC_3.3V and the power supply earth signal, the pin 3 of 34063 chip U4 connects the power supply earth signal by capacitor C 8, the pin 4 of 34063 chip U4 connects the power supply earth signal, the pin 5 of 34063 chip U4 connects the power supply earth signal by resistance R 11 and meets power supply output signal VCC_3.3V by resistance R 10 simultaneously, the negative electrode that the pin 6 of 34063 chip U4 meets diode D2 connects the positive pole of capacitor C 7 simultaneously, the anode of diode D2 connects power supply input signal, and the negative pole of capacitor C 7 connects the power supply earth signal.
The present embodiment is relatively simulated and is realized that circuit is simple, and stable type is good, because the main digital data transmission of passing through of transmission, relatively strong interference immunity; Again because signal has 24 digital-to-analog conversion so precision high, realization high sensitivity that can be fairly simple and highdensity data acquisition, and because the existence of MCU can comparatively simply realize the application of module in different system by protocol modification in a plurality of platforms.
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 requirement of the present invention.
Claims (2)
1. the high accuracy number barometric surveying circuit based on industrial 485 buses is characterized in that: 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 the I2C bus, described single-chip microcomputer is by Serial Port Line TXD, RXD and direction control TorR are connected with described digital 485 interface chips, be connected to 485 interfaces on described digital 485 interface chips, described DC-DC switch chip is connected with power supply to be realized providing power supply to described digital pressure sensor chip, single-chip microcomputer and digital 485 interface chips after the step-down.
2. the high accuracy number barometric surveying circuit based on industrial 485 buses as claimed in claim 1, it is characterized in that: described digital pressure sensor chip is MS5611 chip U1, described single-chip microcomputer is PIC16F876A chip U2, 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 the power supply earth signal, pin 6 is unsettled, pin 7 meets power supply signal VCC_3.3V after drawing on the connecting resistance R2, and the SDA signal end of I2C interface of being connected with PIC16F876A chip U2 connects, pin 8 meets power supply signal VCC_3.3V after drawing on the connecting resistance R1, and is connected the SCL signal end of I2C interface with PIC16F876A chip U2 and connects;
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 capacitor C 4 ground connection, and receive pin 10 by transistor XT1, pin 10 connects pin 9 by capacitor C 5 ground connection and by transistor XT1, pin 1 is the reset signal end, and be connected to power supply signal VCC_3.3V by resistance R 3, and be connected to the power supply earth signal by capacitor C 6, pin 8 and pin 19 all connect the 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 R 4, pin 20 meets power supply signal VCC_3.3V, and by capacitor C 2 ground connection;
The pin 1 of described SN65HVD11 chip U3 is connected with the pin 18 of described PIC16F876A chip U2, pin 2 is connected short circuit and is direction control pin and is connected with the pin 16 of described PIC16F876A chip U2 with pin, pin 4 is connected with the pin 17 of described PIC16F876A chip U2, pin 5 connects the power supply earth signal, pin 6 is connected to power supply signal VCC_3.3V after drawing on the connecting resistance R7, and connect simultaneously the pin 7 of described SN65HVD11 chip U3 by resistance R 9 by the pin 3 that resistance R 5 is received external interface J2, pin 7 is received the power supply earth signal by resistance R 8, and connect simultaneously the pin 6 of described SN65HVD11 chip U3 by resistance R 9 by the pin 2 that resistance R 6 is received external interface J2, pin 8 meets power supply signal VCC_3.3V and connects the power supply earth signal by capacitor C 3, and the pin 1 of external interface J2 connects the power supply earth signal;
The pin 1 of described 34063 chip U4 and pin 7 and pin 8 short circuits also are connected to pin 6 by resistance R 12, pin 2 is connected with the negative electrode of diode D3, the anode of diode D3 connects the power supply earth signal and receives power supply output signal VCC_3.3V by inductance L 1 simultaneously, capacitor C 9 and capacitor C 10 also are connected in power supply signal VCC_3.3V and the power supply earth signal, pin 3 connects the power supply earth signal by capacitor C 8, pin 4 connects the power supply earth signal, pin 5 connects the power supply earth signal by resistance R 11 and meets power supply output signal VCC_3.3V by resistance R 10 simultaneously, the negative electrode that pin 6 meets diode D2 connects the positive pole of capacitor C 7 simultaneously, the anode of diode D2 connects power supply input signal, and the negative pole of capacitor C 7 connects the 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181238A (en) * | 2015-06-04 | 2015-12-23 | 苏州科技学院 | Device for adjusting zero point and measuring range of ceramic pressure sensor |
| CN109186816A (en) * | 2018-10-24 | 2019-01-11 | 中北大学 | A kind of microminiature digital pressure sensor |
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| 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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2013
- 2013-05-22 CN CN201310196760.XA patent/CN103308240B/en active Active
Patent Citations (3)
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|---|---|---|---|---|
| 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 |
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Non-Patent Citations (2)
| Title |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105181238A (en) * | 2015-06-04 | 2015-12-23 | 苏州科技学院 | Device for adjusting zero point and measuring range of ceramic pressure sensor |
| CN109186816A (en) * | 2018-10-24 | 2019-01-11 | 中北大学 | A kind of microminiature digital pressure sensor |
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Effective date of registration: 20200828 Address after: Room 1525, 15 / F, building 10, 6, 8, 10, 12, 16, 18 xuanwumenwai street, Xicheng District, Beijing 100052 Patentee after: Dexun innovation (Beijing) Technology Co., Ltd Address before: No. 21 Huashen road Nanjing Yuhua District 210010 in Jiangsu Province Patentee before: DATCENT TECHNOLOGY Co.,Ltd. |
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