CN104933456A - Singlechip based bar code networking scanning system and method - Google Patents

Abstract

The invention relates to the field of microelectronic technology and barcode identification technology, in particular to a single-chip microcomputer-based barcode networking scanning system and method. After the system is powered on, the barcode scanning query MCU and the networked MCU initialize the LCD module and the WIFI serial port module respectively. After the initialization is completed, the WIFI signal can be detected through the wireless router, and the designated networked MCU downloads and saves the barcode information to the storage module. ; When barcode scanning is performed, the barcode scanning module sends the scanned information to the single-chip microcomputer where the specified barcode is scanned through serial port communication, and the single-chip microcomputer timely displays the code on the LCD screen, and simultaneously searches the storage module according to the barcode number. Display the corresponding information on the LCD screen; in addition, in an environment with network signals, the barcode networking scanning system can update and store barcode information in time.

Description

A single-chip microcomputer-based barcode network scanning system and method

technical field

The invention relates to the field of microelectronic technology and barcode identification technology, in particular to a single-chip microcomputer-based barcode networking scanning system and method.

Background technique

Since the beginning of the last century, due to the emergence of computers, the Internet and mobile communication technologies, a huge wave of social change has been set off. Barcode technology has also begun to appear with the development of computers. The application of barcode technology originated in the early 1970s. For a long time, it has not been generally paid attention to by people; until the 1980s, as a carrier of information, barcodes have the advantages of high accuracy, fast speed, and low cost of marking, and are quickly and widely used in various fields. , has become an important branch in the field of automatic identification; barcodes have been around for more than 30 years, and have formed a certain scale. All aspects of life are closely related to people's lives and are inseparable.

Through the use of barcode automatic identification technology, the relevant information of items can be managed efficiently and reliably, and human errors can be reduced. Each product on the website has its own barcode label. When the cashier is paying the customer, he can use the light pen scanner or laser scanner to scan the barcode label of each product he purchased to complete the settlement. Employees can also pass The computer can query and modify the product information at any time, and analyze which products are best-selling products and which products are unsalable products; 2. The use of barcode recognition systems in industrial production can improve automation, reduce scrap rates, and improve production efficiency; inventory management: including materials and Inventory of spare parts, ordered and pending orders, in order to meet production needs. Production management: including online product tracking, and can also provide accurate status of various work on the workshop site; fixed processing routes, operating status workstation productivity, labor demand, material status, processing time and date, delivery details, etc. can also be identified by barcodes System tracking; For example, on the automobile assembly line, the use of barcode recognition systems can enable thousands of parts to be automatically managed, and automatically sent to the place where they should go for assembly through the conveyor belt. In terms of logistics supply chain management, from product production to finished product off-line, sales, transportation, warehousing, retail and other links, barcode technology can be applied for convenient and fast management; The information generated in each stage is connected together, so that the enterprise is in a favorable position in the fierce market competition; barcode can ensure the accuracy of data, and the use of barcode equipment is convenient and fast; in addition, in the management of banks and personnel files and the circulation of materials, etc. In all aspects, the bar code data processing system can be easily used.

In the future, the main trend of bar code technology development is to improve printing quality, increase density and develop more advanced hardware; in the near future, bar code recognition system will become the most widely used and most popular recognition system; In this design, the traditional barcode scanner usually adopts a wired method, and the scanner is connected to a computer or a host through a standard keyboard port, serial port or USB interface; this structure makes the scanner costly, bulky, and unusable. Convenience and other features; at present, most domestic barcode scanners use wired methods, which makes on-site operation very inconvenient. In view of the above problems, the present invention combines barcode recognition technology with wireless communication technology to design a scanning system based on a single-chip microcomputer. , display, storage, and network query in one barcode scanner, the scanner can realize fast, accurate, real-time reading of item information, and has the advantages of small size, low power consumption, and low cost.

Contents of the invention

The object of the present invention is to provide a barcode networking scanning system based on a single-chip microcomputer. The invention uses a single-chip microcomputer as the control core, uses a barcode scanning module to display the scanned data on the LCD display, and establishes a network connection through the ESP8266 WIFI module at the same time, thereby realizing real-time online query of items; the invention has the advantages of low cost and portability ; At the same time small size, low power consumption, has potential application prospects.

The technical scheme adopted by the present invention to solve its key problem is: as shown in Figure 1, a kind of bar code network scanning system based on single-chip microcomputer, specifically comprises single-chip microcomputer system, liquid crystal display module, storage module, bar code scanning module and voltage stabilized power supply module, It is characterized in that: the single-chip computer system is composed of a barcode scanning and querying single-chip microcomputer and a networked single-chip microcomputer, and is also provided with a WIFI serial port module; the barcode scanning and querying single-chip computer is respectively connected with a liquid crystal display module, a barcode scanning module and a storage module; the networking single-chip computer is respectively connected with a WIFI serial port module , storage module connection; the regulated power supply module supplies power to the system components except the regulated power supply module.

The voltage stabilizing power supply module is composed of a 5V power supply module and a 3.3V voltage stabilizing module. The 5V power supply module is connected with a liquid crystal display module, a barcode scanning module, a barcode scanning and querying single-chip microcomputer, a networked single-chip microcomputer and a 3.3V voltage stabilizing module respectively, and the 3.3V voltage stabilizing module The module is connected with the WIFI serial port module.

The liquid crystal display module is an LCD1206 liquid crystal display module.

Both the barcode scanning and querying single-chip microcomputer and the networking single-chip microcomputer adopt STC89C52 single-chip microcomputer.

The WIFI serial port module adopts ESP8266.

The storage module adopts AT24C02 storage chip.

The barcode scanning module adopts M1206 one-dimensional barcode scanning module.

The P1 pin of the described barcode scanning query single-chip computer is connected to the 8-bit data port DAT of the liquid crystal display, and the P2.0, P2.1, and P2.5 pins of the barcode scanning query single-chip computer are respectively connected to the RS, RW, EN pin; P2.6 and P2.7 pins of the barcode scanning query MCU are respectively connected to the SDA and SCL pins of the storage module; barcode scanning query P3.0 and P3.1 of the MCU are respectively connected to the barcode scanning module.

The P2.6 and P2.7 pins of the networked single-chip microcomputer are respectively connected to the SDA and SCL pins of the storage module, the P3.0 and P3.1 of the networked single-chip microcomputer are respectively connected to the WIFI serial port module, and the P1.5 and P1 pins of the networked single-chip microcomputer are connected respectively. .6 pins are connected to indicator light 1 and indicator light 2 respectively.

The present invention is a barcode networking scanning system based on a single-chip microcomputer. As shown in Figure 1, its working principle is: after the system is powered on, the barcode scanning query single-chip microcomputer and the networking single-chip microcomputer respectively initialize the liquid crystal display module and the WIFI serial port module, and the initialization is completed In the future, the WIFI signal can be detected through the wireless router, and the designated networked single-chip computer will download and save the barcode information to the storage module; when scanning the barcode, the barcode scanning module will send the scanned information to the designated single-chip computer for scanning the barcode through serial communication , the single-chip microcomputer displays the code on the LCD screen in time, and at the same time inquires in the storage module according to the bar code number, and displays the corresponding information on the LCD screen; in addition, in an environment with network signals, the bar code networking scanning system of the present invention The stored barcode information can be updated in time.

The single-chip microcomputer refers to a single-chip microcomputer, and at least two chips are needed; one of them controls networking, and the other controls barcode scanning, query and display, and further, the third chip can also be used as a backup server.

Compared with the traditional barcode scanning system, a barcode networking scanning system based on a single-chip microcomputer of the present invention has the following advantages:

The present invention combines barcode identification technology with wireless communication technology, and is a barcode scanning system that integrates scanning, display, storage, and network query based on a single-chip computer; the scanner system can realize fast, accurate and real-time information on items. Read, and has the advantages of small size, low power consumption, and low cost.

Description of drawings

Fig. 1 is a schematic diagram of a barcode networking scanning system based on a single-chip microcomputer of the present invention.

Figure 2 System schematic diagram.

Figure 3 is the connection diagram of the storage module.

Detailed ways:

The present invention will be described in further detail below with reference to the embodiments of the accompanying drawings, but the protection scope of the present invention should not be limited by this.

A kind of barcode networking scanning system design based on single-chip microcomputer of the present invention comprises the following steps:

1. SCM system design;

2. LCD screen selection;

3. Storage module design;

4. Selection of power supply, barcode scanner and networking module.

Embodiment 1 :

1. The example of the present invention selects two single-chip microcomputers to be responsible for managing different modules respectively, as shown in Figure 2 below; the networked single-chip microcomputer mainly realizes the networking function of the system; P3.0 and P3.1 of the single-chip microcomputer are respectively connected with the WIFI serial port, and P1.5 , P1.6 are respectively connected to two LED indicators 1 and 2, and P2.6, P2.7 are connected to the SDA and SCL terminals of the IIC storage module; the query single-chip microcomputer is mainly used to realize barcode scanning display and query functions. The 8 pins of the P1 port of the microcontroller are connected to the Data I/O port of the LCD, and P2.0, P2.1, and P2.5 are respectively connected to the data/command selection port (RS) and the read/write selection port (R/W ), the enable signal (EN), P2.6, P2.7 are connected to the SDA and SCL terminals of the IIC storage module, and P3.0 and P3.1 are connected to the RXD and TXD of the barcode scanner.

When the example of the present invention is powered on, the networked single-chip microcomputer first runs the initialization program of the WIFI serial port module. When the indicator light 1 is always on, it means that the initialization configuration of the WIFI module has been completed; at this time, the WIFI module can be connected to the device. When the device is connected to WIFI Data transmission can only be carried out at the rear of the module. The indicator light 2 is used to indicate data transmission. When there is data transmission, the indicator light 2 will flash continuously. After the data transmission is completed, the indicator light 2 will go out; the MCU transmits the device through the WIFI module The data is stored in the IIC storage module of the system for the next query comparison; the query single-chip computer is only responsible for the scanning query and display of the barcode. When the barcode scanner scans, the single-chip computer will display the scanned barcode number on the LCD screen in real time In the above, after the scanning is completed, the single-chip microcomputer automatically executes the comparison program, and compares the scanned number with the data in the IIC storage module, and then displays the information contained in the number on the LCD screen.

2. In the example of the present invention, liquid crystal screen is mainly used in the display of bar code, and required character capacity is little, and the working voltage of whole system is about 5 volts, and the working voltage of LCD1206 liquid crystal screen is also 5V, matches with the working voltage of single-chip microcomputer, Therefore select LCD1206 liquid crystal screen module to be directly linked to each other with single-chip microcomputer; Example of the present invention adopts the driver program of writing software simulation LCD liquid crystal device to be: at first carry out liquid crystal display initialization namely, write control order to liquid crystal, make liquid crystal clear screen, cursor complex etc. A series of initialization operations, and then write the data to be displayed; because the internal operation of the LCD screen requires a certain amount of time, if the internal operation is not completed, the external input command will not be operated, so each LCD operation requires Determine the busy state; judge whether the LCD is busy by reading the state of the 7th data port of the DAT, and if it is busy, continue to judge; when it is not busy, the write operation of data/command can be performed, and each Some of them are written as modular functions, and they can be called each other when writing software.

3. In the example of the present invention, it is necessary to store the data transmitted by the WIFI serial port, so the example of the present invention selects the AT24C02 chip of Atmel Corporation for storage expansion; the chip is a 2k serial CMOS E2PROM, and the device operates through the I2C bus interface; Serial communication, therefore can save the I/O mouth of single-chip microcomputer; The single-chip microcomputer that the example of the present invention selects is STC89C52 single-chip microcomputer, and its interior does not contain l2C hardware drive module, therefore can produce corresponding by software simulation with common I/0 mouth pin Timing exchanges data with the SDA and SCL ends of the AT24C02 chip to achieve correct data transmission and reception; first define the SCL and SDA signal pins of the STC89C52 microcontroller according to the system hardware wiring diagram as shown in Figure 3, and then write the driver; The program is composed of some functional functions, which are composed of l2C bus initialization, start signal, stop signal, response signal, data transmission and data reception; By calling these functions, the reading with AT24C02 device can be realized conveniently.

4. People have designed various types of barcode scanners according to different purposes and needs; the barcode scanners currently on the market mainly include the following categories: light pen readers, CCD scanners, laser scanners, light pens are the first to appear A hand-held contact barcode scanner, because the light pen barcode scanner has the characteristics of small size, flexibility and low price, it is also the most economical barcode scanner, but the use of the light pen will also be limited: for example, in some areas that are not suitable for contact In addition, the light pen reader can only play its role on the barcode with a relatively flat surface, specified density and good printing quality; and the operator needs to undergo certain training to use it, because the reading during use Speed, reading angle, and the pressure used will affect its reading performance; CCD is an electronic coupling device, which is more suitable for close-range and contact reading. Its price is not as expensive as laser scanners, and there are no moving parts inside; compared with other scanners Compared with CCD scanners, the price of CCD scanners is cheaper, and unlike light pens, which can only be read by contact, it is easier to use; laser scanners are relatively expensive scanners among various scanners. Laser reading barcodes have a wide range of densities and can Read irregular barcode surfaces. Laser readers are usually the only option when the reading distance exceeds 30cm.

Integrating factors such as the price and scanning performance of the domestic barcode scanner market, what was selected in the example of the present invention is the M1206 one-dimensional barcode scanning module produced by Wanku Electronic Technology Co., Ltd.; this barcode scanning module has small size, light weight, Bright brightness, fast scanning speed, high precision, automatic identification and automatic induction, etc., have excellent quality, reliability and durability. It is one of the most cost-effective OEM module products. It is used in medical equipment, lottery terminals, vending machines and It is widely used in other POS devices.

The working voltage of the M1206 barcode scanning module is 5V. The scanning module has a TTL asynchronous serial communication interface, which can directly communicate with the STC89C52 microcontroller selected by the system; It contains the start identifier and end identifier of the barcode, so it is necessary to remove these two identifiers during actual programming; read out the useful barcode information and display it at the same time.

5. The WIFI module used on the computer is a WIFI network card, which needs to run on the basis of the operating system, and has high requirements on the hardware resources of the host; general industrial equipment and household electrical equipment cannot directly drive such a WIFI network card, so it can Select the WIFI serial port module. The WIFI serial port module is also called the embedded WIFI module. It is a WIFI module with embedded TCP/IP protocol. Its hardware composition is mainly composed of an embedded single-chip microcomputer and a WIFI module. With the TCP/IP protocol, the WIFI module completes the wireless transmission and reception of data; the embedded WIFI module provides a UART serial port or SPI interface, so it can be directly connected to the single-chip computer through the serial port or SPI interface to access the INTERNET network.

The example of this invention uses the ESP8266 WIFI serial port wireless module produced by Espressif Information Technology Co., Ltd. ESP8266 is an ultra-low power consumption UART-WiFi transparent transmission module ESP8266 has rich hardware interfaces and can support UART, IIC, PWM, GPIO, ADC, etc. , suitable for various Internet of Things applications, can connect the user's physical equipment to the wireless network, perform Internet or LAN communication, and realize networking functions, and are widely used in smart grids, smart transportation, smart furniture, handheld devices, and industrial control and other fields.

Claims (10)

1. A bar code networking scanning system based on a single-chip microcomputer, specifically comprising a single-chip microcomputer system, a liquid crystal display module, a storage module, a bar code scanning module and a voltage stabilized power supply module, is characterized in that: the single-chip microcomputer system is made up of a bar code scanning query single-chip microcomputer and a networking single-chip microcomputer , there is also a WIFI serial port module; the barcode scanning query MCU is connected to the LCD module, the barcode scanning module and the storage module respectively; the networked MCU is connected to the WIFI serial port module and the storage module respectively; power supply for the system components. 2. a kind of barcode networking scanning system based on single-chip microcomputer as claimed in claim 1, is characterized in that: described voltage stabilizing power supply module is made up of 5V power supply module and 3.3V voltage stabilizing module, and 5V power supply module is respectively connected with liquid crystal display module, The barcode scanning module, the barcode scanning query microcontroller, the networking microcontroller are connected to the 3.3V voltage regulator module, and the 3.3V voltage regulator module is connected to the WIFI serial port module. 3. A barcode networking scanning system based on a single-chip microcomputer as claimed in claim 1, wherein said liquid crystal display module is an LCD1206 liquid crystal display module. 4. A kind of bar code networking scanning system based on single-chip microcomputer as claimed in claim 1, is characterized in that: described bar code scanning query single-chip microcomputer and networking single-chip microcomputer all adopt STC89C52 single-chip microcomputer. 5. A barcode networking scanning system based on a single-chip microcomputer as claimed in claim 1, wherein said WIFI serial port module adopts ESP8266. 6. A barcode networking scanning system based on a single-chip microcomputer as claimed in claim 1, wherein said storage module adopts AT24C02 storage chip. 7. A barcode networking scanning system based on a single-chip microcomputer as claimed in claim 1, wherein the barcode scanning module is an M1206 one-dimensional barcode scanning module. 8. A kind of bar code networking scanning system based on single-chip microcomputer as claimed in claim 1, is characterized in that: the P1 pin of described bar code scanning query single-chip computer connects the 8 data ports DAT of liquid crystal display screen, the bar code scanning query single-chip Pins P2.0, P2.1, and P2.5 are respectively connected to the RS, RW, and EN pins of the liquid crystal display; P2.6, P2.7 pins of the single-chip microcomputer are respectively connected to the SDA and SCL pins of the storage module P3.0 and P3.1 of the single-chip microcomputer are respectively connected to the barcode scanning module. 9. A kind of barcode networking scanning system based on single-chip microcomputer as claimed in claim 1, it is characterized in that: the P2.6, P2.7 pins of described networking single-chip microcomputer are respectively connected to the SDA, SCL pins of the storage module, and the network P3.0 and P3.1 of the single-chip microcomputer are respectively connected to the WIFI serial port module, and P1.5 and P1.6 pins of the networked single-chip microcomputer are respectively connected to indicator light 1 and indicator light 2. 10. use a kind of method for scanning based on the bar code networked scanning system of single-chip microcomputer as claimed in claim 1, it is characterized in that: after the system is powered on, the bar code scans and inquires that the single-chip microcomputer and the networked single-chip microcomputer initialize the liquid crystal display module and the WIFI serial port module respectively After the initialization is completed, the WIFI signal can be detected through the wireless router, and the designated networked microcontroller will download and save the barcode information to the storage module; when scanning the barcode, the barcode scanning module will send the scanned information to the specified barcode through serial communication. Scanning single-chip microcomputer, the single-chip microcomputer will display the code on the LCD screen in time, and at the same time query the storage module according to the barcode number, and display the corresponding information on the LCD screen; in addition, in an environment with network signals, barcodes can be scanned online The system can update and store barcode information in time.