CN105759690A - Time-sharing measurement control circuit - Google Patents
Time-sharing measurement control circuit Download PDFInfo
- Publication number
- CN105759690A CN105759690A CN201610230816.2A CN201610230816A CN105759690A CN 105759690 A CN105759690 A CN 105759690A CN 201610230816 A CN201610230816 A CN 201610230816A CN 105759690 A CN105759690 A CN 105759690A
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- temperature
- spi bus
- circuit
- data
- measurement
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
Abstract
The invention discloses a time-sharing measurement control circuit. The time-sharing measurement control circuit comprises a controller, a 74HC595, a 1G125, a 1N4148, peripheral circuits, a first SPI bus and a second SPI bus. The first SPI bus is connected between a data collection interface and data output ports of all slave devices. The second SPI bus is connected between the 1G125, the 1N4148, the peripheral circuits and enabled pins of the slave devices. Signal enhancement is carried out on the first SPI bus every eight data collection points, wherein one slave device is corresponding to one data collection point.
Description
Technical field
The present invention relates to circuit field, in particular to a kind of timesharing circuit of measurement and control.
Background technology
In the application scenarios of data acquisition, be connected with main device for gathering the often more from device of data, and circuit is longer, so, how to improve the fan-out capability of the data-out port from device and become, with control, the problem needing solution prior art badly from the selection of device in a large number.
Summary of the invention
The present invention provides a kind of timesharing circuit of measurement and control, in order to overcome at least one problem existed in prior art.
For reaching above-mentioned purpose, the invention provides a kind of timesharing circuit of measurement and control, including: controller, 74HC595,1G125,1N4148 and peripheral circuit, the first spi bus and the second spi bus, described first spi bus is connected to data acquisition interface and each between the data-out port of device, described second spi bus is connected to 74HC595,1G125,1N4148 and peripheral circuit and each between the enable pin of device, every 8 data collection points, described first spi bus being carried out signal enhancing, wherein, one from the corresponding data collection point of device.
Further, described controller adopts the STM32F103 of ST Microelectronics.
Further, described from device be temperature sensor.
Further, described temperature sensor adopts ADT7310.
In the present invention when the device of a large amount of spi bus interfaces is articulated to same spi bus simultaneously, according to spi bus characteristic, main device can only the reading carrying out data from device to spi bus interface one by one.The effect of timesharing circuit of measurement and control is, at a time only one of which is enabled from device and main device carries out communication, improves the fan-out capability of data-out port from device, it is achieved that to a large amount of selections from device and control.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 a is the timesharing circuit of measurement and control schematic diagram of one embodiment of the invention；
Fig. 1 b is for improving the circuit diagram of the fan-out capability of ADT7310 data-out port in Fig. 1 a；
Fig. 2 a, Fig. 2 b figure are front view and the side view of the frost penetration sensor of one embodiment of the invention；
Fig. 3 is the structure chart of the frost penetration sensor of one embodiment of the invention；
Fig. 4 is the controller architecture schematic diagram of one embodiment of the invention；
Fig. 5 is the Temperature sampler structural representation of one embodiment of the invention；
Fig. 6 is the protection pipe profile of one embodiment of the invention；
Fig. 7 is the temperature acquisition board schematic diagram of one embodiment of the invention；
Fig. 8 a, Fig. 8 b are the bus driver ability intensifier circuit schematic diagram of one embodiment of the invention；
Fig. 8 c, Fig. 8 d are the temperature acquisition interface circuit schematic diagram of one embodiment of the invention；
Fig. 8 e is the temperature sensor timesharing circuit of measurement and control schematic diagram of one embodiment of the invention；
Fig. 8 f is for improving the circuit diagram of the fan-out capability of ADT7310 data-out port in Fig. 8 e.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not paying creative work premise, broadly fall into the scope of protection of the invention.
Fig. 1 a is the timesharing circuit of measurement and control schematic diagram of one embodiment of the invention；Fig. 1 b is the circuit diagram of the fan-out capability for improving ADT7310 data-out port of one embodiment of the invention；In Fig. 1 a, all devices constitute a spi bus cascade module.
U1～U8 represents the device with spi bus interface, and uses as from device.
The serial chip select data sent by main device are converted to parallel output by U27 (74HC595), corresponding corresponding from the enable pin of device respectively, thus completing to select from the uniqueness of device synchronization all.
U9 (1G125) is for improving the fan-out capability of the data-out port from device.Owing to this product circuit structure is cascade mode, so circuit is longer, U9 (1G125) is therefore adopted outputting data signals to be strengthened from device every 8.In order to prevent rear class from the impact on data signal at the corresponding levels of the data signal of device module, adopt 1G125 and 9 1N4148 (D2～D10) to complete.The each corresponding enable signal from device with spi bus interface at the corresponding levels of D2～D9, if one of them signal of a module is enabled, then the 1G125 of this module is enabled, this enable signal is transmitted to the module before it by D10, make before it until the 1G125 of main device pin all opens enable, the 1G125 of this module module below is all disabling high-impedance state, it is prevented that data/address bus is affected.
If the device of a large amount of spi bus interfaces is articulated to same spi bus simultaneously, according to spi bus characteristic, main device can only the reading carrying out data from device to spi bus interface one by one.The effect of timesharing circuit of measurement and control is, at a time only one of which is enabled from device and main device carries out communication.
Use when the purposes of timesharing circuit of measurement and control is the device cascade for a large amount of spi bus interfaces.
SPI is the abbreviation of Serial Peripheral Interface (SPI) (SerialPeripheralInterface).Spi bus is a kind of high speed, full duplex, the communication bus of synchronization, it is possible to achieve be that a main equipment (CPU) connects multiple purpose from equipment.Numeric type temperature sensor configuration is flexible, stable, capacity of resisting disturbance strong, and data acquisition accuracy is high, meets high standard data monitoring requirement.
The bright spot of this design is in that control is measured in the timesharing efficiently solving the device number of a large amount of spi bus interface.In frozen soil example, using the temperature sensor with spi bus interface is 200.
Circuit theory is in conjunction with 74HC595,1G125,1N4148 and peripheral circuit complete to be positioned on spi bus and control from the enable signal of device, being positioned on a spi bus thus reaching 200 temperature sensors, at a time only one of which is enabled and carries out communication with main device and complete the purpose of data transmission.
Above-mentioned timesharing circuit of measurement and control have the advantages of following three points:
The first, can expand from the number of device, when power supply line enough thick (ensureing that line resistance is only small), it is possible to infinite stages expands；
The second, only complete a large amount of from the collection of device data by 7 signal line；
3rd, this method for designing is adopted, the ID self-assembling formation of each point, it is not necessary to deliberately arrange, what each 74HC595 from the position of the SPI at device place sent enables signal is exactly this ID from device, this ID by circuit self-assembling formation without configuration, therefore abbreviation use loaded down with trivial details degree significantly.
Below for the timesharing circuit of measurement and control of the present invention being applied to the embodiment of frost penetration sensor.
Fig. 2 a, Fig. 2 b figure are front view and the side view of the frost penetration sensor of one embodiment of the invention；Fig. 3 is the structure chart of the frost penetration sensor of one embodiment of the invention；As shown in the figure; A is soil, and B is ground surface, and frost penetration sensor is the automatic measurer for the frozen soil layer degree of depth; including: controller 2, Temperature sampler 6, protection pipe 3, waterproof sealing box 1, Embedding Material 5 and control cable 4, its middle controller 2 is arranged in waterproof sealing box 1；Waterproof sealing box 1 is fixedly installed on protection pipe 3 one end；During the other end of protection pipe 3 is placed into the soil；Temperature sampler 6 is potted in the groove of protection pipe 3 side by Embedding Material entirety, and Temperature sampler 6 is embedded in tested soil together with protection pipe 3；Control cable 4 to be connected between controller 2 and Temperature sampler 6.In Fig. 3, external equipment 201 is connected with controller 2, controller 2 includes RS-485 interface 202, processor 203 (can preferably high-performance low-power-consumption processor), power module the 204, first temperature acquisition interface 205, it is natural number that Temperature sampler 6 includes the second temperature acquisition interface 206 and the 1st the temperature collection circuit plate 207 being connected with the second temperature acquisition interface 206, the 2nd temperature collection circuit plate 208 ..., the n-th temperature collection circuit plate 209 and (n+1)th temperature collection circuit plate 210, n.
Owing to the condition of infield limits (field, high and cold); all employings technical grade temperature standard (-40 DEG C～85 DEG C) of all components and parts; box body and protection pipe more than classification of waterproof IP65, according to there being huge fathom (the present embodiment fathoms) for 2 meters.
Hereinafter each parts of frost penetration sensor are described in detail.
(1) controller
Controller provides power supply for Temperature sampler, and being read out and processing the temperature data of Temperature sampler collection, and with the data communication of external equipment.Controller is arranged in the seal box of classification of waterproof IP65.
CPU selects the STM32F103 of ST Microelectronics as processor.STM32 series is based on aiming at the custom-designed ARMCortex-M3 kernel of Embedded Application requiring high-performance, low-power consumption.Therefore the data of controller process very powerful with ability to communicate.
Controller adopts DC12V power voltage supply.Power module adopts LM2576 series to be the 3A electric current output buck switching mode integrated regulator that National Semiconductor produces, and efficiently, stablizes.
RS-485 interface, as the communication interface of controller Yu peripheral hardware, adopts ModBus standard agreement.
Controller is connected by temperature acquisition interface with Temperature sampler, and interface comprises spi bus, temperature sensor timesharing measuring control signal and power supply.
(2) Temperature sampler
Temperature sampler is for the collection for temperature data, internal with 200 temperature points, (more collecting circuit board can be concatenated according to demand and complete deeper of temperature acquisition) is constituted by 25 pieces of collecting circuit board concatenations, high density can be completed measure, to ensure Temperature sampler certainty of measurement.Owing to using the restriction of environment, Temperature sampler is potted in protection pipe.Its mounting means adopts buried, is perpendicular to during ground surface together places into the soil by protection pipe together with Temperature sampler.The selection of the degree of depth is the weather conditions according to tested place, imbeds respective depth.
In one embodiment; protection pipe adopts the epoxy resin rod of long 2200mm, wide 40mm, high 40mm; one side surface digs out the Baltimore groove of long 2000mm, wide 30mm, deep 30mm, and Temperature sampler is potted in Baltimore groove by epoxy resin filling thing and silicon rubber filling thing.
Temperature sampler is made up of 25 pieces of collecting circuit board cascades, is connected by silicone rubber winding displacement between two pieces of collecting circuit boards.Every piece of collecting circuit board is evenly distributed 8 temperature sensors with 1cm for spacing.
Collecting circuit board is made up of Temperature sampler interface circuit, bus driver ability intensifier circuit, temperature sensor timesharing circuit of measurement and control and 8 temperature sensors.The cascade for being connected with controller and between collecting circuit board of the harvester interface circuit.The effect of bus driver ability intensifier circuit is to strengthen spi bus driving force, it is achieved simultaneously drive 200 nodes.The effect of temperature sensor timesharing circuit of measurement and control is the data selecting to read which temperature sensor.Temperature sensor is owing to detecting the temperature value of temperature sensor position.
Fig. 6 is the protection pipe profile of one embodiment of the invention；Fig. 7 is the temperature acquisition board schematic diagram of one embodiment of the invention；Fig. 8 a, Fig. 8 b are the bus driver ability intensifier circuit schematic diagram of one embodiment of the invention；Fig. 8 c, Fig. 8 d are the temperature acquisition interface circuit schematic diagram of one embodiment of the invention；Fig. 8 e is the temperature sensor timesharing circuit of measurement and control schematic diagram of one embodiment of the invention；Fig. 8 f is the circuit diagram of the fan-out capability for improving ADT7310 data-out port of one embodiment of the invention.In Fig. 6, the unit of length is millimeter；In Fig. 7,601 is temperature sensor, and 602 is silicone rubber winding displacement, and 603 is collecting circuit board.
It is further described the present invention below from measuring principle angle.
The measuring principle of frost penetration sensor is the numerical value of the temperature sensor that controller is successively read on Temperature sampler and is saved in internal register.Register data in external equipment Read Controller, according to the data obtained, searches 0 DEG C of temperature below sensor number of measurement data, converses frost penetration according to temperature sensor numbering.
(1) controller
Its working method is that controller circulates the data reading internal 200 temperature sensors of Temperature sampler with the temporal frequency of 1s, and save the data in CPU internal register, when external equipment needs reading temperature data, the data of corresponding registers only need to be read.
Being sent measurement instruction according to master slave system by peripheral hardware, measurement restarted by controller, and when temperature sensor quantity is more, controller collection one is taken turns temperature data and taken longer, and the peripheral hardware waiting time is long.The benefit of this working method is, it is ensured that the real-time of data and can quickly read data.
Temperature sampler is made up of 200 temperature sensors, and maximum measuring depth is up to 2m.
(2) Temperature sampler
The design philosophy of Temperature sampler is utilize the numeric type temperature sensor with spi bus to form one to be similar to the scale that can read temperature.SPI is the abbreviation of Serial Peripheral Interface (SPI) (SerialPeripheralInterface).Spi bus is a kind of high speed, full duplex, the communication bus of synchronization, it is possible to achieve be that a main equipment (CPU) connects multiple purpose from equipment (temperature sensor).Numeric type temperature sensor configuration is flexible, stable, capacity of resisting disturbance strong, and data acquisition accuracy is high, meets high standard data monitoring requirement.
Due to climate reasons, frost penetration has huge difference, and the frost penetration in some place is shallower, and the frost penetration in some place is relatively deep, and the Temperature sampler of uniform length cannot meet the demand of all users.In order to meet all customer demands, Temperature sampler adopts circuit board cascade mounting design pattern.Namely Temperature sampler is made up of some collecting circuit board cascades, and the advantage of this design is the length (measure dot number) that user can suitably select Temperature sampler according to the meteorological condition in tested place.When burying Temperature sampler underground, extremely facilitate user construct and install, reduce work on the spot amount.
The maximum design bright spot of Temperature sampler is in that to efficiently solve the timesharing of big measurement point (temperature sensor number) and measures and control.Timesharing is measured and is controlled to be meant that to need one by one temperature sensor to be carried out the reading of data when coding, and now, it would be desirable to have a signal to tell the CPU hanging in bus, these data are which chip transmits.
Temperature acquisition sensor adopts double; two spi bus, the mode organizing temperature sensor cascade to constitute more.Article 1, spi bus is used for the temperature acquisition order of each temperature sensor ADT7310 and the transmission of temperature value, the enable signal that another spi bus completes to be positioned at temperature sensor on Article 1 spi bus in conjunction with 74HC595 and peripheral circuit controls, being positioned on a spi bus thus reaching 200 temperature sensors, at a time only one of which is enabled and carries out communication with single-chip microcomputer and complete the purpose of temperature acquisition.So design have the advantages of three: the first, the collection of temperature sensor is counted and can be expanded, when power supply line enough thick (ensureing that line resistance is only small), it is possible to infinite stages expands；The second, only the temperature acquisition of a large amount of temperature spot is completed by 7 signal line；3rd, this method for designing is adopted, the ID self-assembling formation of each point, it is not necessary to deliberately arrange, what the 74HC595 of the position of the SPI at each temperature sensor place sent enables the ID that signal is exactly this temperature acquisition point, this ID by circuit self-assembling formation without configuration, therefore abbreviation use loaded down with trivial details degree significantly.
In Fig. 8 a-Fig. 8 f, serial chip select data are converted to parallel output by U27 (74HC595), and the enable pin of corresponding corresponding temperature sensor chip ADT7310, selects thus completing the uniqueness to all the sensors chip synchronization respectively.
U25, U26 (74HC3G34) are for strengthening SPI signal.Owing to this product circuit structure is cascade mode, so circuit is longer, U25, U26 is therefore adopted every 8 temperature acquisition points, SPI signal to be strengthened.
U9 (1G125), for improving the fan-out capability of ADT7310 data-out port, owing to this product circuit structure is cascade mode, so circuit is longer, therefore adopts U9 (1G125) every 8 temperature acquisition points, temperature signal to be strengthened.In order to prevent the impact on data signal at the corresponding levels of the data signal of the sensor module of rear class, 1G125 and 9 1N4148 (D2～D10) are adopted to complete.The each corresponding temperature sensor at the corresponding levels of D2～D9 enables signal, if one of them signal of a module is enabled, then the 1G125 of this module is enabled, this enable signal is transmitted to the module before it by D10, make before it until the 1G125 of single-chip microcomputer pin all opens enable, the 1G125 of this module module below is all disabling high-impedance state, it is prevented that data/address bus is affected.
(3) protection pipe
Section of structure according to protection pipe; pipe shell material is protected to be the material that heat conductivity is relatively low shown in figure; if using the material (such as metal material) that heat conductivity is high as protection pipe; heat transfer process due to material; so protection pipe can make each point temperature of measurement tend to equalization, affects measurement result.
Epoxy resin has physical strength height, corrosion-resistant, and insulativity is high, and the feature that heat conductivity is low thus avoids and corroded by the material in soil.Silicone rubber has excellent electrical insulation capability, sealing property and ageing-resistant performance.The surface of silicone rubber can be less than most of organic materials, has agent of low hygroscopicity, does not bond with many materials, and filled silicon rubber makes circuit board be isolated from the outside.
Through test, this novel frozen soil sensor construction is simple, with low cost, it is easy to accomplish, operable by force.Substantially increase the precision of frozen soil detection.And use the frozen soil sensor long service life of this structure, it is not subject to seasonal restrictions, is especially suitable for field usage.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, module or flow process in accompanying drawing are not necessarily implemented necessary to the present invention.
One of ordinary skill in the art will appreciate that: the module in device in embodiment can describe in the device being distributed in embodiment according to embodiment, it is also possible to carries out respective change and is disposed other than in one or more devices of the present embodiment.The module of above-described embodiment can merge into a module, it is also possible to is further split into multiple submodule.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in previous embodiment still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of embodiment of the present invention technical scheme.
Claims (4)
1. a timesharing circuit of measurement and control, it is characterized in that, including: controller, 74HC595,1G125,1N4148 and peripheral circuit, the first spi bus and the second spi bus, described first spi bus is connected to data acquisition interface and each between the data-out port of device, described second spi bus is connected to 74HC595,1G125,1N4148 and peripheral circuit and each between the enable pin of device, every 8 data collection points, described first spi bus being carried out signal enhancing, wherein, one from the corresponding data collection point of device.
2. timesharing circuit of measurement and control according to claim 1, it is characterised in that described controller adopts the STM32F103 of ST Microelectronics.
3. timesharing circuit of measurement and control according to claim 1, it is characterised in that described from device be temperature sensor.
4. timesharing circuit of measurement and control according to claim 1, it is characterised in that described temperature sensor adopts ADT7310.
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| CN201610230816.2A CN105759690A (en) | 2016-04-14 | 2016-04-14 | Time-sharing measurement control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112527721A (en) * | 2020-12-04 | 2021-03-19 | 苏州华兴源创科技股份有限公司 | Integrated circuit bus interface control device, method and system |
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