CN204463120U - A kind of miniature data acquisition system (DAS) based on MCU - Google Patents
A kind of miniature data acquisition system (DAS) based on MCU Download PDFInfo
- Publication number
- CN204463120U CN204463120U CN201520024368.1U CN201520024368U CN204463120U CN 204463120 U CN204463120 U CN 204463120U CN 201520024368 U CN201520024368 U CN 201520024368U CN 204463120 U CN204463120 U CN 204463120U
- Authority
- CN
- China
- Prior art keywords
- micro
- das
- processing circuit
- processor mcv
- data acquisition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Read Only Memory (AREA)
- Power Sources (AREA)
Abstract
The utility model discloses a kind of miniature data acquisition system (DAS) based on MCU, comprise signal pre-processing circuit, A/D change-over circuit, power supply and observation circuit, Micro-processor MCV, external memory storage and data communication interface; Measured signal is transported to miniature data acquisition system (DAS) by signal pre-processing circuit; Described host computer is connected with Micro-processor MCV by data communication interface, completes further process and the display of data; Described signal pre-processing circuit adopts the two computing integrated amplifiers based on LM2904 chip.This miniature data acquisition system (DAS) structure based on Serial ATA mode is simple, low energy, adopts the FLASH storing mode of serial line interface significantly to improve read-write speed, effectively increases system reliability, reduce system bulk.
Description
Technical field
The utility model belongs to power electronics and detects applied technical field, particularly relate to a kind of miniature data acquisition system (DAS) based on MCU, this acquisition system adopts the FLASH storing mode of serial line interface significantly to improve read-write speed, effectively increases system reliability, reduces system bulk.
Background technology
Along with the widespread use of computing machine and the development of electronic technology, digital technology is widely used in the every field such as national economy, national defense construction and scientific experiment.Compare with simulation system, digital display circuit has the series of advantages such as precision is high, good stability, but has individual shortcoming to be exactly that it can only process discrete signal.Extraneous various tested measurement, as temperature, pressure, position etc., will convert the physical quantity such as voltage, electric current to by all kinds sensor.Because it is analog quantity that most of sensor exports physical quantity, should and need to be converted to digital signal could by controller process.
Along with industrial field control is to the raising of parameter requirement of real-time, people have had higher requirement to the precision of data acquisition and storage system, capacity, power consumption and anti-interference etc., and therefore various high-performance MCU and external memory storage occur one after another.Along with the development of SOC (system on chip) technology, require various function to be integrated in one more and more, some well-known manufacturers release embedded SOC one after another.By A/D, D/A function i ntegration on MCU, its great advantage is a simplified system peripherals circuit design, and reduce system power dissipation, system bulk reduces greatly.Data storage method mainly contains parallel memorizing and serial stores.Parallel memorizing is comparatively simple, just need more data line and address wire, also latch possibly, the system line of making becomes complicated, and each of transmission data must be in the same position in the clock period, and frequency is higher, require stricter to the transmission performance of device and circuit structure, system difficulty strengthens, and system cost improves, and reliability reduces.The increasing serial mode that uses stores data now.
Utility model content
The defect existed for above-mentioned prior art and deficiency, the purpose of this utility model is, a kind of miniature data acquisition system (DAS) based on MCU is provided, data acquisition system (DAS) structure of the present utility model is simple, low energy, the FLASH storing mode of serial line interface is adopted significantly to improve read-write speed, effective increase system reliability, reduces system bulk, realizes USB communication simultaneously and show based on the graphics data of Labview.
In order to realize above-mentioned task, the utility model adopts following technical solution:
Based on a miniature data acquisition system (DAS) of MCU, it is characterized in that, comprise signal pre-processing circuit, power supply and observation circuit, A/D conversion, Micro-processor MCV, external memory storage and data communication interface; Measured signal is transported to Micro-processor MCV by signal pre-processing circuit and A/D conversion, described power supply and observation circuit are changed with signal pre-processing circuit, A/D and are connected with Micro-processor MCV, power supply and observation circuit provide+3.3V stable operating voltage for system, described external memory storage is connected with Micro-processor MCV, and described Micro-processor MCV is connected with host computer by data communication interface; Described Micro-processor MCV adopts C8051F series monolithic as core processor, completes measured signal process, conversion and collection; Described external storage adopts the external memory storage of band SPI interface.
The two integrated amplification chip of computing of LM2904 type should be comprised based on the signal pre-processing circuit in the miniature data acquisition system (DAS) of Serial ATA mode, 1k Ω resistance (R1), 91k Ω resistance (R4), 0.001nF electric capacity (C4) and 10 μ F electric capacity (C2), described measured signal is connected with the normal phase input end (4) of operational amplifier LM2904 by 1k Ω resistance (R1), the inverting input (3) of described operational amplifier LM2904 is connected with the output terminal (1) of operational amplifier LM2904 by 91k Ω resistance (R4), described 0.001nF electric capacity (C4) is in parallel with 91k Ω resistance (R4), the output terminal (1) of described LM2904 is connected with A/D translation interface Vout by 10 μ F electric capacity (C2).
The beneficial effects of the utility model are:
The variable quantity of the rectified signal that sensor exports is generally 10mV ~ 50mV, signal must be amplified, be so just conducive to carrying out signal transacting before carrying out signal transacting; Every straight bleeder circuit, the worry of the DC component of detecting circuit signal is gone, and by the quiescent operation Automatic level control of signal at about 2V, make the maximum voltage that it can bear lower than microcontroller pin, ensure the normal work of processor.LM2904 is a kind of two computing integrated amplifier, and can be operated in up to 32V wide-voltage range, its DC voltage gain is 100dB, and gain bandwidth product is 1.1MHz.LM2904 operational amplifier adopts single power supply, the 15V voltage that VCC provides for power supply adaptor, and the signal input interface of VDD to be the operating voltage 3.3V of C8051F340, Vin be detecting circuit, Vout is the output signal after Signal Pretreatment.
Signal pre-processing circuit adopts LM2904 to form in-phase proportion amplification computing circuit, and input voltage acts on the normal phase input end of LM2904 by resistance R1, therefore output voltage and homophase.Resistance R4 is connected across output terminal and the inverting input of LM2904, introduces series voltage negtive backword.Inverting input is by resistance R3 ground connection, and R3 is compensating resistance, to ensure the symmetry of LM2904 input stage differential amplifier circuit.
Micro-processor MCV adopts the main microcontroller of C8051F series monolithic as Acquisition Circuit of Silicon Labs company.C8051F340 device is integrated with full-speed/low-speed USB function control device, for realizing the external unit of USB interface.USB function control device (USB0) is made up of serial interface engine (SIE), USB transceiver (comprising build-out resistor and configurable pull-up resistor), 1kB FIFO external memory storage and clock recovery circuitry, does not need outer member.
This miniature data acquisition system (DAS) structure based on Serial ATA mode is simple, low energy, adopts the FLASH storing mode of serial line interface significantly to improve read-write speed, effectively increases system reliability, reduce system bulk.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.
Fig. 1 is this miniature data acquisition system (DAS) structural drawing;
Fig. 2 is the microprocessor MCU hardware structure diagram of this system;
Fig. 3 is the signal pre-processing circuit figure of this system;
Fig. 4 is the software overview flow chart of this system.
Embodiment
Fig. 1 is this miniature data acquisition system (DAS) structural drawing, and the miniature data acquisition system (DAS) based on Serial ATA mode comprises signal pre-processing circuit, power supply and observation circuit, A/D conversion, Micro-processor MCV, external memory storage and data communication interface; Described measured signal is transported to Micro-processor MCV by signal pre-processing circuit and A/D conversion, described power supply and observation circuit are changed with signal pre-processing circuit, A/D and are connected with Micro-processor MCV, power supply and observation circuit provide+3.3V stable operating voltage for system, described external memory storage is connected with Micro-processor MCV, and described Micro-processor MCV is connected with host computer by data communication interface; Described Micro-processor MCV adopts C8051F series monolithic as core processor, completes measured signal process, conversion and collection; Described external storage adopts the external memory storage of band SPI interface.
Fig. 2 is the microprocessor MCU hardware structure diagram of this system, and the C8051F series monolithic of Systematic selection Silicon Labs company is as the main microcontroller of Acquisition Circuit.C8051F series monolithic is integrated mixed signal SOC (system on a chip), have and MCS-51 kernel and the complete compatible microcontroller of instruction set, except the digital peripherals parts with standard 8051, in sheet, be also integrated with analog component conventional in data acquistion and control system and other digital peripherals and functional part.The functional part of C8051F series monolithic comprises Multipexer selector switch, programmable gain amplifier, ADC, DAC, voltage comparator, voltage reference, temperature sensor, SMBus/I2C, UART, SPI, programmable counter/Timer Array (PCA), timer, digital I/O mouth, supply monitor, watchdog circuit WDT and clock oscillator.The IC technique of the number-analog/mixed signal process of this chip advanced person, considerably improves conversion speed and precision, and the high-performance of its series of products allows user more neatly to chip programming.This series monolithic is the SOC (system on a chip) that really can work alone.CPU is management simulation and digital peripherals effectively, can close single or whole peripheral hardware to save power consumption.
Fig. 3 is the signal pre-processing circuit figure of this system, signal pre-processing circuit comprises the two integrated amplification chip of computing of LM2904 type, 1k Ω resistance (R1), 91k Ω resistance (R4), 0.001nF electric capacity (C4) and 10 μ F electric capacity (C2), described measured signal is connected with the normal phase input end (4) of operational amplifier LM2904 by 1k Ω resistance (R1), the inverting input (3) of described operational amplifier LM2904 is connected with the output terminal (1) of operational amplifier LM2904 by 91k Ω resistance (R4), described 0.001nF electric capacity (C4) is in parallel with 91k Ω resistance (R4), the output terminal (1) of described LM2904 is connected with A/D translation interface Vout by 10 μ F electric capacity (C2).
Fig. 4 is the software overview flow chart of this system, the software work process of notebook data harvester is: be first the start that powers on, single-chip microcomputer starts A/D converse routine after sending acquisition instructions and carries out data acquisition to detecting circuit, simultaneously by acquired data storage in FLASH, call USB interface program after collection completes and detecting circuit is uploaded to PC terminal, LabVIEW terminal hander realizes storing and waveform display by reading USB interface data.
The utility model person of an ordinary skill in the technical field also can understand in addition to the foregoing, can change combination further in this explanation and illustrated specific embodiment.Such as, C8051F Series of MCU MCU can be replaced by other type as Infineon XD512 Series MCU.
Although the utility model gives diagram explanation with regard to its preferred embodiment, but person skilled in the art is understood that, in spirit and scope of the present utility model limited in the attached claims, also can make all changes and variation to the utility model.
Claims (2)
1. based on a miniature data acquisition system (DAS) of MCU, it is characterized in that, comprise signal pre-processing circuit, power supply and observation circuit, A/D conversion, Micro-processor MCV, external memory storage and data communication interface; Measured signal is transported to Micro-processor MCV by signal pre-processing circuit and A/D conversion, described power supply and observation circuit are changed with signal pre-processing circuit, A/D and are connected with Micro-processor MCV, power supply and observation circuit provide+3.3V stable operating voltage for system, described external memory storage is connected with Micro-processor MCV, and described Micro-processor MCV is connected with host computer by data communication interface; Described Micro-processor MCV adopts C8051F series monolithic as core processor, completes measured signal process, conversion and collection; Described external storage adopts the external memory storage of band SPI interface.
2. a kind of miniature data acquisition system (DAS) based on MCU as claimed in claim 1, it is characterized in that, described signal pre-processing circuit comprises the two integrated amplification chip of computing of LM2904 type, 1k Ω resistance (R1), 91k Ω resistance (R4), 0.001nF electric capacity (C4) and 10 μ F electric capacity (C2), described measured signal is connected with the normal phase input end (4) of operational amplifier LM2904 by 1k Ω resistance (R1), the inverting input (3) of described operational amplifier LM2904 is connected with the output terminal (1) of operational amplifier LM2904 by 91k Ω resistance (R4), described 0.001nF electric capacity (C4) is in parallel with 91k Ω resistance (R4), the output terminal (1) of described LM2904 is connected with A/D translation interface Vout by 10 μ F electric capacity (C2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520024368.1U CN204463120U (en) | 2015-01-14 | 2015-01-14 | A kind of miniature data acquisition system (DAS) based on MCU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520024368.1U CN204463120U (en) | 2015-01-14 | 2015-01-14 | A kind of miniature data acquisition system (DAS) based on MCU |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204463120U true CN204463120U (en) | 2015-07-08 |
Family
ID=53669977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520024368.1U Expired - Fee Related CN204463120U (en) | 2015-01-14 | 2015-01-14 | A kind of miniature data acquisition system (DAS) based on MCU |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204463120U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361594A (en) * | 2019-06-24 | 2019-10-22 | 天津市计量监督检测科学研究院 | A kind of acquisition device and its application method for dynamic power consumption detection |
-
2015
- 2015-01-14 CN CN201520024368.1U patent/CN204463120U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361594A (en) * | 2019-06-24 | 2019-10-22 | 天津市计量监督检测科学研究院 | A kind of acquisition device and its application method for dynamic power consumption detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104199343A (en) | Micro data collection system based on serial storage mode | |
| CN105486392A (en) | Small electronic weighing system based on single-chip microcomputer | |
| CN103822667A (en) | Temperature-humidity acquisition system based on Bluetooth technology | |
| CN204463120U (en) | A kind of miniature data acquisition system (DAS) based on MCU | |
| CN201795814U (en) | Integrated temperature and humidity monitoring device | |
| CN104332040A (en) | WiFi (wireless fidelity)-based mobile bee-keeping car temperature and humidity acquisition system | |
| CN201903879U (en) | Data collector of SD card | |
| CN202886397U (en) | Mining portable wind speed measuring device | |
| CN204229611U (en) | A kind of mobile mobile bee-keeper humiture collection circuit based on WiFi | |
| CN201984307U (en) | ARM Cortex M 0 based digital time difference conversion MCU chip | |
| CN206557143U (en) | Soil temperature-moisture sensor new-type circuit | |
| CN204389714U (en) | A kind of weather monitoring instrument realizing Temperature and Humidity based on SHT2X chip | |
| CN205121374U (en) | Heat dissipation control system based on singlechip | |
| CN205317327U (en) | Small -size electronic weight system based on singlechip | |
| CN205642545U (en) | Ground water level remote monitering system | |
| CN201707391U (en) | Small-sized portable real-timely energy consumption monitoring device | |
| CN207132965U (en) | A kind of Multifunctional electronic scale based on Ethernet | |
| CN204129034U (en) | The integrated water quality monitoring sensor of the multi-functional multiparameter of water environment | |
| CN201892601U (en) | Novel intelligent pressure sensor | |
| CN203480375U (en) | Core board | |
| CN204027554U (en) | For measuring the device of the height of tree | |
| CN204902881U (en) | Humiture measurement system based on singlechip | |
| CN201638047U (en) | Data collecting device based on USB interface | |
| CN204347062U (en) | Cup type air velocity transducer threshold wind velocity check system | |
| CN203300111U (en) | Humiture monitor for wireless liquid crystal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20160114 |