CN203415003U

CN203415003U - Campus card attendance system

Info

Publication number: CN203415003U
Application number: CN201320385130.2U
Authority: CN
Inventors: 张丽萍
Original assignee: SHANGHAI TD TELECOM TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: SHANGHAI TD TELECOM TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2013-06-28
Filing date: 2013-06-28
Publication date: 2014-01-29
Anticipated expiration: 2023-06-28

Abstract

The utility model discloses a campus card attendance system. The campus card attendance system comprises a CPU, as well as a storage module, an IC card read-write module, a system clock module, a keyboard interface module, an LCD display module and a USB-TTL serial port module which are all coupled with the CPU, wherein the USB-TTL serial port module comprises a USB controller, a USB transceiver, a clock oscillator and a UART which are connected to one another; the UART has all modem control signals,. The campus card attendance system adopts an STC12C5A32S2 singlechip for controlling and a PHILIPS highly-integrated ISO14443A card reading chip for information acquisition, so that the class attending condition of students can be known efficiently and simply, classroom attendance is simplified, classroom time waste caused by attendance check is reduced, and a teacher can clearly know the attendance condition of each student.

Description

Campus card attendance checking system

Technical field

The utility model relates to a kind of attendance checking system, refers in particular to a kind of campus card attendance checking system.

Background technology

Along with improving constantly and the progressively quickening of people's rhythm of life of modern society's scientific and technological level, the use of non-contact IC card has been become to very general, it is just bringing into play more and more important effect in our daily life and work.

Non-contact IC card is also referred to as contact-free integrated circuits card, radio-frequency card or contact type intelligent card.The higher traffic rate of non-contact IC jig, without plug action use simple, can within the very short time, complete the features such as read-write operation to card, so non-contact IC card is particularly suitable in, use person-time relatively concentrated place higher to communication speed requirement, as subway import and export, expressway entrance and exit, company pass in and out the environment such as getting on or off the bus of gate inhibition, bus.

At present, non-contact IC is stuck in each colleges and universities of the whole nation and is widely used, each student has an IC-card as the campus card of its identify label, in card, this student's the information such as student number, name, class have not only been recorded in data field, can also in campus, consume as consumption card.In the teaching management on ordinary days of Er school integral body, how can efficiently and easily to student's the situation of attending class, add up, simplify check class attendance, reduce the waste of work attendance time to the class period, the attendance that facilitates teacher to understand clearly each student is the major issue of pendulum in college teaching management.

Utility model content

The purpose of this utility model is to provide a kind of and efficiently and easily student's situation is carried out to the effectively campus card attendance checking system of statistics.

For solving the problems of the technologies described above, the utility model campus card attendance checking system, comprises central controller and the memory module being of coupled connections with described central controller, IC-card module for reading and writing, system clock module, keyboard interface module, LCD display module and USB-TTL serial port module; Wherein said USB-TTL serial port module comprises interconnective USB controller, USB transceiver, clock oscillator and with whole UART of modem control signals.

Preferably, in described keyboard interface module, be provided with input circuit, described input circuit comprises six key circuits parallel with one another, and described key circuit is comprised of resistance and button.

Preferably, described central controller adopts STC12C5A32S2 single-chip microcomputer.

Preferably, described memory module adopts serial EEPROM chip AT24C64.

Preferably, described system clock module adopts real-time timepiece chip DS1302.

Preferably, described LCD display module adopts OCM12862 Graphic lattice LCD display module.

Preferably, described USB-TTL serial port module adopts PL2303HX chip.

The utility model campus card attendance checking system adopts STC12C5A32S2 single-chip microcomputer to control and the high integrated ISO14443A Card Reader chip of PHILIPS carries out the collection of information, thereby efficiently and easily student's the situation of attending class is added up, simplify check class attendance, reduce the waste of work attendance time to the class period, facilitate teacher to understand clearly each student's attendance.

Accompanying drawing explanation

Fig. 1 is the utility model campus card attendance checking system block diagram;

Fig. 2 is the utility model campus card attendance checking system central controller pinouts;

Fig. 3 is the utility model campus card attendance checking system IC-card module for reading and writing block diagram;

Fig. 4 is the utility model campus card attendance checking system LCD display module circuit diagram;

Fig. 5 is the utility model campus card attendance checking system USB-TTL serial port module circuit diagram;

Fig. 6 is the utility model campus card attendance checking system keyboard interface module circuit diagram;

Fig. 7 is the utility model campus card attendance checking system system clock module block diagram;

Fig. 8 is the utility model campus card attendance checking system memory module block diagram.

Embodiment

Below in conjunction with accompanying drawing, the utility model campus card attendance checking system is described in further detail.

As shown in Fig. 1～Fig. 8, the utility model campus card attendance checking system, comprises central controller and the memory module being of coupled connections with central controller, IC-card module for reading and writing, system clock module, keyboard interface module, LCD display module and USB-TTL serial port module.

1, central controller

Central controller is usingd the STC12C5A32S2 single-chip microcomputer of macrocrystalline scientific & technical corporation as controller, mainly completes the work of work attendance information acquisition, and it also has digital clock function, data storage, the functions such as data serial port transmission.

2, IC-card module for reading and writing

After noncontact IC card read/write device is encoded by the information of needs transmission, be loaded on the carrier wave of a fixed frequency, in card, there is a resonant circuit, its frequency is identical with the carrier frequency that read write line sends, when non-contact IC card enters behind the perform region of read write line, resonant circuit produces and resonates and produce charge accumulated, when charge accumulated arrives certain numerical value, just can provide work group voltage for the circuit in card, reset signal, system clock, the data message that read write line sends is through radio frequency interface module decoding in card, by control module, judged requirement and the rationality of these information, then process, whether final decision is rewritten or is exported the data in EEPROM.

3, LCD display module

In this attendance checking system, because the information that needs show is more, also comparatively complicated, simple seven segment digital tubes can only show numeral and a small amount of character, function is often limited to, and helpless for more complicated character or figure, this far can not meet the requirement of man-machine interaction display interface.And LCD display module in this attendance checking system is a kind of low-power consumption, low-cost display device, LCD display module not only can show that numerous characters also can Display of Chinese characters or even figure, and it can easily dock with STC12C5A32S2 single-chip microcomputer.Based on above these advantages, thereby in native system, adopted OCM12862 Graphic lattice LCD display module.OCM12862 is a 128 * 64 dot matrix type LCD display module, and it can show various types of characters and figure, has the interface that can directly be connected with single-chip microcomputer, has eight normal data buses and six control lines and a power lead.Adopt KS0108 to control IC.Here be used for read clock and work attendance information.

4, USB-TTL serial port module

The English full name of USB-TTL serial port module is USB to Serial port Module, according to actual situation, the consideration of comprehensive convenience and cost, it is core change-over circuit that our system adopts PL2303HX chip, not only can well solve the problem that single-chip microcomputer and host computer data are transmitted, also avoid now a lot of computers there is no the inconvenience of serial ports.

PL2303HX is that the integrated USB of a kind of height turns serial port chip, can provide a full duplex asynchronous serial communication device and USB functional interface the convenient solution connecting.This device the inside is built-in USB controller, USB transceiver, clock oscillator and with whole UART of modem control signals, only need us externally to connect several electric capacity and just can easily usb signal and rs 232 serial interface signal be changed mutually, can conveniently join in our portable set.This device is a USB/ serial ports bi-directional conversion device, then the data that it can receive USB port from main frame are translated into Serial Port Information stream and send to corresponding peripheral hardware, also can receive data from serial ports peripheral hardware and then be converted to usb data form and send respective hosts to

5, keyboard interface module

In order to improve the service efficiency of single-chip processor i/o mouth, the AD translation function of utilizing STC single-chip microcomputer itself to have here, button design adopts special parallel way shown in upper figure.

In STC single-chip microcomputer AD modular converter have the slewing rate of 300,000 times/second, full accuracy can reach 10, under the operating voltage of 5V, minimum precision can reach 0.005V.And the corresponding voltage of each button of this circuit is respectively:

1.064V, 0.532V, 0.355,0.266V, 0.213V, 0.177V, minimum interval is 0.036V, is greater than the distinguishable voltage of minimum of AD module, this Design Mode, in the situation that only taking a port, can be used six press keys, has saved the resource of single-chip microcomputer, provides cost savings.

6, system clock module

While swiping the card, to record the time of swiping the card, way with external hardware real-time timepiece chip, for system provides a clock accurately and reliably, while guaranteeing also can normally walk when the system power failure with 3V reserve battery, at this, select that volume is little, the simple real-time timepiece chip DS1302 of interface.

DS1302 is low in energy consumption, the easy serial real-time timepiece chip of interface that possesses of U.S. DALLAS company exploitation, by SCLK, I/O, tri-lines of RST and outside, carries out synchronous serial communication.

7, memory module

Adopt serial EEPROM chip AT24C64 to make data-carrier store.AT24C64 is the conventional Serial E 2PROM storage chip of employing I2C bus standard that atmel corp produces, and it supports I2C bus data host-host protocol, and 64K(bit) memory span forms serial line interface with two lines and CPU.

The utility model campus card attendance checking system be take general single chip system as core, by radiofrequency signal, send portable contactless IC-card read write line, send to again host scm to process, single-chip microcomputer stores data into FLASH storer, to import at one's leisure PC into data analysis, storage, processing.

The utility model campus card attendance checking system STC12C5A32S2 single-chip microcomputer carries out as microcontroller, adopt the high integrated ISO14443A Card Reader chip of PHILIPS as radio-frequency card read/write modules, adopt DS1302 as system clock, using AT24C64 as not power down storer, adopt LCD to show, and with USB-TTL interface module and compunication, form a set of multiple functional contactless IC card read/write system.When IC-card in region through out-of-date, the automatic demand of single-chip microcomputer is read and write IC-card, the time of read/write card is deposited in storer together, computing machine can be read relevant read/write card information on computing machine by USB-TTL interface module again, then add up, form and printout etc.

Below the preferred embodiment of the utility model having been created illustrates, but the utility model is not limited to embodiment, those of ordinary skill in the art also can make all modification being equal to or replacement under the prerequisite without prejudice to the utility model creative spirit, and the modification that these are equal to or replacement are all included in the application's scope.

Claims

1. campus card attendance checking system, is characterized in that, comprises central controller and the memory module being of coupled connections with described central controller, IC-card module for reading and writing, system clock module, keyboard interface module, LCD display module and USB-TTL serial port module; Wherein

Described USB-TTL serial port module comprises interconnective USB controller, USB transceiver, clock oscillator and with whole UART of modem control signals.

2. campus card attendance checking system according to claim 1, is characterized in that, in described keyboard interface module, is provided with input circuit, and described input circuit comprises six key circuits parallel with one another, and described key circuit is comprised of resistance and button.

3. campus card attendance checking system according to claim 1, is characterized in that, described central controller adopts STC12C5A32S2 single-chip microcomputer.

4. campus card attendance checking system according to claim 1, is characterized in that, described memory module adopts serial EEPROM chip AT24C64.

5. campus card attendance checking system according to claim 1, is characterized in that, described system clock module adopts real-time timepiece chip DS1302.

6. campus card attendance checking system according to claim 1, is characterized in that, described LCD display module adopts OCM12862 Graphic lattice LCD display module.

7. campus card attendance checking system according to claim 1, is characterized in that, described USB-TTL serial port module adopts PL2303HX chip.