CN112200290A - Data acquisition and management device based on SD card - Google Patents
Data acquisition and management device based on SD card Download PDFInfo
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/0772—Physical layout of the record carrier
- G06K19/07732—Physical layout of the record carrier the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0644—Management of space entities, e.g. partitions, extents, pools
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- G—PHYSICS
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
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- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
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- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4411—Configuring for operating with peripheral devices; Loading of device drivers
Abstract
The invention discloses a data acquisition and management device based on an SD card, which comprises a core unit and a power management unit for supplying power to the core unit, wherein the core unit comprises a main control unit, a data acquisition unit, a storage unit and a communication unit which are respectively connected with the main control unit, and a display unit connected with the communication unit; the data acquisition unit acquires signals of the sensor and transmits acquired related parameters to the main control unit; the main control unit processes the received data, realizes the storage and access of the data through the storage unit, completes the management of the file, and completes the interaction of the data through the communication unit and the display unit, and realizes the display of the data and the issuing of the command. The invention can rapidly complete the storage and access of data, adopts the SD card data for management, and has the advantages of low cost, large storage capacity, direct data import into an industrial personal computer and the like; and a directory block and data block partition operation method is adopted, so that the data access efficiency of the device is improved.
Description
Technical Field
The invention belongs to the field of automatic control, and particularly relates to a data acquisition and management device based on an SD card.
Background
With the development of science and technology, data acquisition and storage become important components in the field of automatic control. The traditional data acquisition device mostly adopts a Flash chip as a storage medium. This storage approach has the following disadvantages:
firstly, the Flash chip has small capacity and cannot realize the storage of huge data;
secondly, the Flash chip is high in price, so that the design cost of the device is increased;
thirdly, the Flash chip is usually welded on a circuit board and cannot directly perform data interaction with an industrial personal computer.
Disclosure of Invention
The invention is provided for overcoming the defects existing in the technology that the existing data acquisition device adopts a Flash chip as a storage medium, and aims to provide a data acquisition and management device based on an SD card.
The invention is realized by the following technical scheme:
the utility model provides a data acquisition and management device based on SD card, includes core unit and the power management unit for the core unit power supply, the core unit includes the main control unit, data acquisition unit, memory cell and the communication unit be connected with the main control unit respectively to and the display element who is connected with the communication unit.
In the technical scheme, the data acquisition unit acquires signals of the sensor and transmits acquired related parameters to the main control unit; the main control unit processes the received data, realizes the storage and access of the data through the storage unit, completes the management of the file, and completes the interaction of the data through the communication unit and the display unit, and realizes the display of the data and the issuing of the command.
In the above technical solution, the main control unit includes a main control chip, and a reset circuit, a clock circuit and a program download circuit are integrated outside the main control chip; the reset circuit is controlled by a tact switch; the clock circuit comprises a crystal oscillator and a filter capacitor; the program downloading circuit comprises a program downloading port, and one pin of the program downloading port is connected with the light touch switch.
In the technical scheme, the data acquisition unit comprises an AD acquisition interface, and a voltage division circuit is arranged between each pin of the AD acquisition interface and the corresponding pin of the main control chip; the voltage division circuit is formed by connecting a plurality of resistors in series.
In the above technical solution, the storage unit includes an SD card and an SD card storage interface for connecting the SD card with the main control chip.
In the above technical solution, the data storage area of the storage unit includes a directory block and a data block, the directory block includes a plurality of data address information of each attribute stored in the directory block in a linked list form, and the data block includes a plurality of data information of each attribute stored in the data block in a linked list form.
In the above technical solution, the directory block further includes address information of damaged data, and the data block further includes information of damaged data.
In the above technical solution, the communication unit includes a serial port chip and an isolation chip; pins 1 and 8 of the isolation chip are connected with a +3.3V power supply and are connected in series through a resistor R23; pins 4 and 5 of the isolation chip are grounded; pins 2 and 3 of the isolation chip are connected with pins 147 and 150 of the main control chip; pins 6 and 7 of the isolation chip are connected with pins 4 and 3 of the serial port chip; pins 1, 2 and 16 of the serial port chip are connected with + 3.3V; pins 8 and 9 of the serial port chip are grounded; pins 5 and 12 of the serial port chip are grounded through filter capacitors C5 and C8 respectively; pins 6 and 7 of the serial port chip are respectively connected with pins 1 and 2 of the C7; pins 10 and 11 of the serial port chip are respectively connected with pins 1 and 2 of the C10; pins 13 and 14 of the serial port chip are pins Tx and Rx of the chip; c4, C6, and C9 are filter capacitances of + 3.3V.
In the technical scheme, the display unit comprises an industrial serial port screen and a display unit interface, wherein the display unit interface realizes the connection between the industrial serial port screen and a serial port chip of the communication unit, and the pin 1 is connected with the pin +5V, and the pin 2 is connected with the pin 13 of the serial port chip; pin 3 is connected with pin 14 of the serial port chip; the 4-pin is grounded.
In the above technical solution, the power management unit includes a power conversion chip, and an overheat protection circuit and a current-limiting protection circuit are integrated therein; the 1 pin of the power conversion chip is grounded, the 2 pin outputs +3.3V through C12 filtering, the 3 pin adopts +5V input, and filtering is performed through C11.
The invention has the beneficial effects that:
the invention provides a data acquisition and management device based on an SD card, which can rapidly finish the storage and access of data, adopts the data of the SD card for management, and has the advantages of low cost, large storage capacity, direct data introduction into an industrial personal computer and the like; and a directory block and data block partition operation method is adopted, so that the data access efficiency of the device is improved.
Drawings
FIG. 1 is a schematic structural diagram of a data acquisition and management device based on an SD card according to the present invention;
FIG. 2 is a circuit diagram of a main control unit in the data acquisition and management device based on the SD card according to the present invention;
FIG. 3 is a circuit diagram of a data acquisition unit in the data acquisition and management device based on the SD card according to the present invention;
FIG. 4 is a circuit diagram of a storage unit in the SD card based data acquisition and management device of the present invention;
FIG. 5 is a circuit diagram of a communication unit of the data acquisition and management device based on the SD card according to the present invention;
FIG. 6 is a circuit diagram of a display unit of the SD card based data acquisition and management device according to the present invention;
FIG. 7 is a circuit diagram of a power management unit in the SD card based data acquisition and management device according to the present invention;
FIG. 8 is a partition structure diagram of the data storage area of the SD card in the data acquisition and management device based on the SD card according to the present invention;
FIG. 9 is a flow chart of the acquisition and management method of the data acquisition and management device based on the SD card according to the present invention;
fig. 10 is a flowchart of a file operation method in the acquisition and management method of the data acquisition and management device based on the SD card according to the present invention.
Wherein:
1 data acquisition unit 2 main control unit
3 storage unit 4 communication unit
5 display unit 6 Power management Unit
7 main control chip 8 program downloading port
9 AD acquisition interface 10 SD card storage interface
11 isolation chip 12 serial port chip
13 display unit interface 14 power conversion chip
Directory block of 15 File storage area 16 data block of File storage area
17 data address information 18 corrupted address
19 the data information 20 has corrupted the data information.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the data acquisition and management device based on SD card by means of specific embodiments with reference to the drawings of the specification.
Example 1
As shown in fig. 1, a data acquisition and management device based on an SD card includes a core unit and a power management unit 6 for supplying power to the core unit, where the core unit includes a main control unit 2, a data acquisition unit 1, a storage unit 3, and a communication unit 4 respectively connected to the main control unit 2, and a display unit 5 connected to the communication unit 4;
the data acquisition unit 1 acquires signals of the sensor and transmits acquired related parameters to the main control unit 2; the main control unit 2 processes the received data, realizes the storage and access of the data through the storage unit 3, completes the management of files, and completes the interaction of the data through the communication unit 4 and the display unit 5, and realizes the display of the data and the issuing of instructions.
As shown in fig. 2, the main control unit includes a main control chip 7 of model STM32F407IGT6, and a reset circuit, a clock circuit and a program downloading circuit are integrated outside the main control chip; the reset circuit is controlled by a touch switch, so that manual reset can be realized; the clock circuit comprises a passive quartz crystal oscillator of 8MHz and a filter capacitor, and can provide a stable clock source for the main control chip; the program downloading circuit comprises a program downloading port 8, one pin of the program downloading port is connected with the light touch switch, the program downloading port 8 adopts an SWD debugging interface, only 6 pins are needed, and external resources of the main control chip 7 are saved.
The specific circuit connection is as follows: the VSS pin and the 37 pin of the main control chip 7 are grounded, the VDD, 38 and 39 pins are connected with +3.3V, the 58 pin is connected with a pull-down resistor R1, the 166 pin is connected with pull-down resistors R2, 29 and 30 pins and is respectively connected with the 1 pin and the 2 pin of a crystal oscillator X1 of the clock circuit, filtering is carried out through capacitors C1 and C2, the 31 pin is respectively connected with a pull-up resistor R4, the 4 pin of the program downloading port 8 and the 1 pin of a light touch switch S1, the 137 pin is connected with the 1 pin of the program downloading port 8 after being pulled down by a resistor R5, and the 124 pin is connected with the 2 pin of the program downloading port 8 after being pulled up by a resistor R3; the 5 pin of the program downloading port 8 is connected with +3.3V, and the 6 pin is grounded; pin 2 of tact switch S1 is grounded.
As shown in fig. 3, the data acquisition unit includes an AD acquisition interface 9 and a voltage division circuit connected between the AD acquisition interface and the main control chip 7. The voltage division circuit is formed by connecting a plurality of resistors in series.
The AD acquisition interface 9 adopts a special ADC pin of the main control chip 7, and in order to increase the voltage detection amplitude, a voltage division circuit is arranged between the AD acquisition interface and the main control chip 7, namely, the ADC pin divides the voltage of an input signal by a resistor series connection method, and a user can complete data acquisition by configuring two reserved selectable welding resistors.
The specific circuit connection is as follows: a 40 pin (PA0) of the master control chip is connected into a1 pin of the 9 through voltage dividing resistors R6 and R12; the 41 pin (PA1) of the master control chip is connected into the 2 pin of 9 through the divider resistors R7 and R13; a 47 pin (PA3) of the master control chip is connected into a3 pin of the 9 through voltage dividing resistors R8 and R14; a pin 50 (PA4) of the master control chip is connected into a pin 4 of the pin 9 through voltage dividing resistors R9 and R15; a 51 pin (PA5) of the master control chip is connected into a5 pin of the 9 pin through voltage dividing resistors R10 and R16; the pin 52 (PA6) of the master control chip is connected to the pin 6 of the pin 9 through voltage dividing resistors R11 and R17.
As shown in fig. 4, the storage unit includes an SD card and an SD card storage interface 10 for connecting the SD card with the main control chip 7.
The storage unit adopts an SD card to finish the storage of the file data. The SD card supports two operation modes of SPI and SDIO, and the invention adopts the SDIO mode to complete the drive of the SD card. Compared with the SPI mode, the SDIO mode has advantages of a fast response speed, a large amount of transmission data, and the like.
The specific circuit connection is as follows: the SD card is connected with the main control chip 7 through an SD card storage interface 10, and a pin 9 of the SD card storage interface 10 is connected with a pin 139(PC10) of the main control chip after passing through a pull-up resistor R18; the pin 1 of the SD card storage interface 10 is connected with the pin 140(PC11) of the main control chip through a pull-up resistor R19; the 2 pin of the SD card storage interface 10 is connected with the 144(PD2) pin of the main control chip through a pull-up resistor R20; the 7 pin of the SD card storage interface 10 is connected with the 117(PC8) pin of the main control chip through a pull-up resistor R21; the 8 pin of 10 is connected with the 118(PC9) pin of the main control chip after passing through a pull-up resistor R22; the 3 pins of the SD card memory interface 10 are grounded, the 1 pin of the capacitor C3 and the 2 pin of the C3 is connected with + 3.3V; the 4 pins of the SD card storage interface 10 are connected with a power supply with + 3.3V; pin 5 of the SD card memory interface 10 is connected with pin 141(PC12) of the main control chip; the 6 pins of the SD card memory interface 10 are grounded.
As shown in fig. 8, the data storage area in the storage unit includes a directory block 15 and a data block 16, the directory block 15 includes a plurality of data address information 17 of each attribute stored in the directory block 15 in the form of a linked list, and the data block 16 includes a plurality of data information 19 of each attribute stored in the data block 16 in the form of a linked list; the directory block 15 further comprises corrupted data address information 18 and the data block 16 further comprises corrupted data information 20.
The directory block 15 is used for storing data address information 17 with different attributes; the data block 16 is used to store specific data information 19 and is sorted by attributes. In the data access process, the main control unit 7 finds 15 the address information 17 of the attribute data through the directory block, and the address information 17 can be directly positioned to the data information 19 of the attribute under the data block 16, thereby completing the data access. The method reduces the file access times by times and improves the data operation efficiency.
As shown in fig. 5, the communication unit includes a serial chip 12 (RS-485 chip) with a model of MAX3485 and an isolated chip 11 with a model of ISO 7221. The serial port chip 12 is powered by 5V, and the transmission rate of 2.5Mbps can be realized at most. The isolation chip 11 can effectively isolate signals, complete the conversion of level signals, improve the anti-interference capability and effectively ensure the stability of RS-485 communication.
The specific circuit connection is as follows: pins 1 and 8 of the isolation chip 11 are connected with a power supply +3.3V and are connected in series through a resistor R23; pins 4 and 5 of the isolation chip 11 are grounded; pins 2 and 3 of the isolation chip 11 are connected with pins 147(PD5) and 150(PD6) of the main control chip 7; pins 6 and 7 of the isolation chip 11 are connected with pins 4 and 3 of the serial port chip 12. Pins 1, 2 and 16 of the serial port chip 12 are connected with + 3.3V; pins 8 and 9 of the serial port chip 12 are grounded; pins 5 and 12 of the serial port chip 12 are grounded through filter capacitors C5 and C8 respectively; pins 6 and 7 of the serial port chip 12 are respectively connected with pins 1 and 2 of the C7; pins 10 and 11 of the serial port chip 12 are respectively connected with pins 1 and 2 of the C10; pins 13 and 14 of the serial port chip 12 are pins Tx and Rx of the chip; c4, C6, and C9 are filter capacitances of + 3.3V.
As shown in fig. 6, the display unit includes an industrial serial port screen and a display unit interface 13 for connecting the industrial serial port screen with the serial port chip 12 of the communication unit. The industrial serial port screen adopts DMT64480S056 industrial serial port screen developed by DWIN (Diving) company, the resolution of the serial port screen is 800 × 480, the power supply can select 3.3V/5V, the interface can select RS232/RS485, functional modules such as internal integrated list display, control instruction, numerical value display and data entry are arranged, and a user can complete the management of a file system through the functional modules.
The specific circuit connection is as follows: pin 1 of the display unit interface 13 is connected with +5V, and pin 2 is connected with pin 13 of the serial port chip 12; pin 3 is connected with pin 14 of the serial port chip 12; the 4-pin is grounded.
As shown in fig. 7, the power management unit includes a power conversion chip 14 of type LM1117-3.3, and since the core unit is powered by a +5V power adapter, the power conversion chip 14 realizes the conversion of +5V to +3.3V, and an overheat protection circuit and a current-limiting protection circuit are integrated in the power conversion chip 14, and the accuracy of the output voltage is within ± 1%, which can provide stable voltage output for each component unit of the core unit.
The specific circuit connection is as follows: the 1 pin of the power conversion chip 14 is grounded, the 2 pin outputs +3.3V through C12 filtering, the 3 pin adopts +5V input, and filtering is performed through C11.
Example 2
As shown in fig. 9, the data collection and management method of the SD card-based data collection and management apparatus according to embodiment 1 includes the following steps:
starting S1;
(ii) System initialization S2
The method comprises the steps of initializing a system clock, serial port communication, AD acquisition and display unit and SD card bottom layer drive;
(iii) determining whether the SD card read has timed out S3
If yes, executing step (ix), otherwise executing step (iv);
(iv) reading the AD sample value and processing the sample data S4;
(v) write SD card S7
Writing the AD sampling data into an SD card in a fixed format;
(vi) determining whether the SD card has successfully written into S8
If the write successfully performs step (vii), otherwise step (iv) is performed.
(vii) determine whether the serial port receives the data access command S9
If step (viii) is executed, otherwise step (iii) is executed;
(viii) accessing File in SD card S10
Accessing data in the SD card according to the communication instruction;
(ix) returning alarm information, returning SD card read timeout information S5;
(x) ends S6.
Example 3
As shown in fig. 10, based on embodiment 2, the flow of the method for reading and writing data in the data acquisition and management device based on the SD card is as follows:
SD card initialization completion S11;
(ii) judging the read/write command S12
If the instruction is a file reading instruction, executing the step (iii), and if the instruction is a writing instruction, executing the step (vii);
(iii) query directory Block S13
Querying data pointers one by one from the directory block;
(iv) determining whether a data pointer exists S14
If the directory pointer is found, performing step (v), otherwise performing step (xiv);
(v) data Address location S15
Positioning the data block address according to the directory block data;
(vi) read data S16;
(vii) query directory Block S17
Querying data pointers one by one from the directory block;
(viii) determining whether a data pointer exists S18
If there is execution step (ix), otherwise executing step (xi);
(ix) locating the data block address according to the data pointer S19;
(x) write data S20;
(xi) Creating a data pointer in the directory block S21;
(xii) Locating the data address in the data block according to the data pointer S22;
(xiii) Write data S23;
(xiv) Ending S24.
The working principle of the invention is as follows;
the FAT32 file system is transplanted in an STM32F4 main control chip, and a data storage area is divided into a directory block and a data block in the text creation process; and writing address information of different attribute data in the fixed directory block sector of the file. During the data access process, the directory block data is read first, and the data is compared to obtain data addresses with different attributes. And writing specific data information in the fixed data block sector of the file, and classifying according to the attribute. And in the data access process, accessing the detailed data information one by one according to the data addresses obtained by the directory block.
The invention provides a data acquisition and management device based on an SD card, which can rapidly finish the storage and access of data, adopts the data of the SD card for management, and has the advantages of low cost, large storage capacity, direct data introduction into an industrial personal computer and the like; and a directory block and data block partition operation method is adopted, so that the data access efficiency of the device is improved.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The utility model provides a data acquisition and management device based on SD card which characterized in that: including the core cell and for power management unit (6) of core cell power supply, the core cell includes main control unit (2), data acquisition unit (1), memory cell (3) and communication unit (4) be connected with main control unit (2) respectively to and display element (5) be connected with communication unit (4).
2. The SD card-based data collection and management device according to claim 1, characterized in that: the data acquisition unit (1) acquires signals of the sensor and transmits acquired related parameters to the main control unit (2); the main control unit (2) processes the received data, realizes the storage and access of the data through the storage unit (3), completes the management of files, and completes the interaction of the data through the communication unit (4) and the display unit (5), and realizes the display of the data and the issuing of instructions.
3. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the main control unit (2) comprises a main control chip (7), and a reset circuit, a clock circuit and a program downloading circuit are integrated outside the main control chip; the reset circuit is controlled by a tact switch; the clock circuit comprises a crystal oscillator and a filter capacitor; the program downloading circuit comprises a program downloading port (8), and one pin of the program downloading port is connected with the light touch switch.
4. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the data acquisition unit (1) comprises an AD acquisition interface (9), and a voltage division circuit is arranged between each pin of the AD acquisition interface (9) and the corresponding pin of the main control chip (7); the voltage division circuit is formed by connecting a plurality of resistors in series.
5. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the storage unit (3) comprises an SD card and an SD card storage interface (10) which is connected with the main control chip (7).
6. The SD card based data collection and management device of claim 5, wherein: the data storage area of the storage unit (3) comprises a directory block (15) and a data block (16), wherein the directory block (15) comprises a plurality of data address information (17) of each attribute stored in the directory block (15) in a form of a linked list, and the data block (16) comprises a plurality of data information (19) of each attribute stored in the data block (16) in a form of a linked list.
7. The SD card-based data acquisition and management device according to claim 6, characterized in that: the directory block (15) further comprises corrupted data address information (18), and the data block (16) further comprises corrupted data information (20).
8. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the communication unit comprises a serial port chip (12) and an isolation chip (11); pins 1 and 8 of the isolation chip (11) are connected with a power supply +3.3V and are connected in series through a resistor R23; pins 4 and 5 of the isolation chip (11) are grounded; pins 2 and 3 of the isolation chip (11) are connected with pins 147 and 150 of the main control chip (7); pins 6 and 7 of the isolation chip (11) are connected with pins 4 and 3 of the serial port chip (12); pins 1, 2 and 16 of the serial port chip (12) are connected with + 3.3V; pins 8 and 9 of the serial port chip (12) are grounded; pins 5 and 12 of the serial port chip (12) are grounded through filter capacitors C5 and C8 respectively; pins 6 and 7 of the serial port chip (12) are respectively connected with pins 1 and 2 of the C7; pins 10 and 11 of the serial port chip (12) are respectively connected with pins 1 and 2 of the C10; pins 13 and 14 of the serial port chip (12) are pins Tx and Rx of the chip; c4, C6, and C9 are filter capacitances of + 3.3V.
9. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the display unit comprises an industrial serial port screen and a display unit interface (13) for realizing the connection of the industrial serial port screen and a serial port chip (12) of the communication unit, wherein the pin 1 of the display unit interface (13) is connected with +5V, and the pin 2 is connected with the pin 13 of the serial port chip (12); the 3 pins are connected with the 14 pins of the serial port chip (12); the 4-pin is grounded.
10. The SD card-based data collection and management device according to claim 1 or 2, characterized in that: the power management unit comprises a power conversion chip (14), and an overheat protection circuit and a current-limiting protection circuit are integrated in the power conversion chip; the 1 pin of the power conversion chip (14) is grounded, the 2 pin outputs +3.3V through C12 filtering, the 3 pin adopts +5V input, and filtering is carried out through C11.
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| CN202011214813.2A CN112200290A (en) | 2020-11-04 | 2020-11-04 | Data acquisition and management device based on SD card |
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