CN103325150A

CN103325150A - Campus card attendance system

Info

Publication number: CN103325150A
Application number: CN 201310270848
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: 2013-09-25

Abstract

The invention discloses a campus card attendance system. The campus card attendance system comprises a central controller, and a storage module, an IC (Integrated Circuit) card read/write module, a system clock module, a keyboard interface module, an LCD (Liquid Crystal Display) module and a USB-TTL (Universal Serial Bus-Transistor-Transistor Logic) serial port module which are coupled with the central controller, wherein the USB-TTL serial port module comprises a USB controller, a USB transceiver, a clock oscillator and a UART (Universal Asynchronous Receiver/Transmitter) with all modem control signals which are connected with one another. The campus card attendance system disclosed by the invention adopts an STC12C5A32S2 single-chip microcomputer for control and a PHILIPS high-integration ISO14443A card reading chip for information collection, thus efficiently, easily and conveniently carrying out statistics for the attendance of students, simplifying the class attendance, reducing the waste of class time due to attendance time, and being convenient for teachers to clearly understand the attendance of each student.

Description

The campus card attendance checking system

Technical field

The present invention relates to a kind of attendance checking system, refer 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 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, need not plug action use simple, can within the very short time, finish the characteristics such as read-write operation to card, so non-contact IC card is particularly suitable for passing in and out the environment such as getting on or off the bus of gate inhibition, bus in, a use person-time place of relatively concentrating higher to the communication speed requirement such as subway import and export, expressway entrance and exit, company.

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, this student's the information such as student number, name, class have not only been recorded in the data field in the card, can also consume in the campus as consumption card.And in the on ordinary days teaching management of school's integral body, how can efficiently and easily add up student's on class situation, simplify check class attendance, the minimizing work attendance time, the attendance that makes things convenient for the teacher to understand clearly each student was the major issue of pendulum in the college teaching management to the waste of class period.

Summary of the invention

The object of the present invention is to provide a kind of campus card attendance checking system of efficiently and easily student's situation effectively being added up.

For solving the problems of the technologies described above, campus card attendance checking system of the present invention comprises central controller and the memory module that is 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 that interconnective USB controller, USB transceiver, clock oscillator reach the UART with whole modem control signals.

Preferably, be provided with input circuit in the described keyboard interface module, 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 the 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 the PL2303HX chip.

Campus card attendance checking system employing STC12C5A32S2 single-chip microcomputer of the present invention is controlled with the high integrated ISO14443A Card Reader chip of PHILIPS and is carried out the collection of information, thereby efficiently and easily student's on class situation is added up, simplify check class attendance, the minimizing work attendance time makes things convenient for the teacher to understand clearly each student's attendance to the waste of class period.

Description of drawings

Fig. 1 is campus card attendance checking system block diagram of the present invention;

Fig. 2 is campus card attendance checking system central controller pinouts of the present invention;

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

Fig. 4 is campus card attendance checking system LCD display module circuit diagram of the present invention;

Fig. 5 is campus card attendance checking system USB-TTL serial port module circuit diagram of the present invention;

Fig. 6 is campus card attendance checking system keyboard interface module circuit diagram of the present invention;

Fig. 7 is campus card attendance checking system system clock module block diagram of the present invention;

Fig. 8 is campus card attendance checking system memory module block diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing campus card attendance checking system of the present invention is described in further detail.

Such as Fig. 1～shown in Figure 8, campus card attendance checking system of the present invention comprises central controller and the memory module that is 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 as controller, is mainly finished the work of work attendance information acquisition with the STC12C5A32S2 single-chip microcomputer of macrocrystalline scientific ﹠ technical corporation, and it also has the digital clock function, data storage, the functions such as data serial port transmission.

2, IC-card module for reading and writing

Noncontact IC card read/write device will be loaded on the carrier wave of a fixed frequency after will needing the information that sends encoded, a resonant circuit is arranged in the card, its frequency is identical with the carrier frequency that read write line sends, enter the perform region of read write line when non-contact IC card after, resonant circuit produces resonance and produces charge accumulated, when charge accumulated arrives certain numerical value, just can provide the worker to organize voltage for the circuit in blocking, reset signal, system clock, the data message that read write line sends is through radio frequency interface module decoding in the card, judged requirement and the rationality of these information by control module, then process, whether final decision is rewritten or is exported the data in the EEPROM.

3, LCD display module

In this attendance checking system, owing to need the information of demonstration 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 then helpless for complicated character or figure, this far can not satisfy the requirement of man-machine interaction display interface.And the LCD display module in this attendance checking system is a kind of low-power consumption, low-cost display device, and the LCD display module can show that not only numerous characters also can Display of Chinese characters or even figure, and it can easily dock with the 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 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, situation according to reality, the consideration of comprehensive convenience and cost, it is the core change-over circuit that our system adopts the 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 not have 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 that connects.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 it can be translated into Serial Port Information stream from the data that main frame receives USB port and send to corresponding peripheral hardware, also can then be converted to the usb data form from serial ports peripheral hardware receive data 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, special parallel way shown in the upper figure of button design employing here.

In the STC single-chip microcomputer the AD modular converter have 300,000 times/second slewing rate, 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, the minimum interval is 0.036V, greater than the minimum distinguishable voltage of AD module, this Design Mode can use six press keys in the situation that only take a port, has saved the resource of single-chip microcomputer, provides cost savings.

6, system clock module

To record the time of swiping the card when swiping the card, way with external hardware real-time timepiece chip, for system provides an accurately and reliably clock, when guaranteeing also can normally walk when the system power failure with the 3V reserve battery, select at this 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, carries out synchronous serial communication by SCLK, I/O, three lines of RST and outside.

7, memory module

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

Campus card attendance checking system of the present invention is take the general single chip system as core, send portable contactless IC-card read write line with radiofrequency signal, sending to host scm processes again, single-chip microcomputer stores data into the FLASH storer, in order to import at one's leisure PC into to data analysis, storage, processing.

Campus card attendance checking system STC12C5A32S2 single-chip microcomputer of the present invention carries out as microcontroller, adopt the high integrated ISO14443A Card Reader chip of PHILIPS as the radio-frequency card read/write modules, adopt DS1302 as system clock, with AT24C64 as not power down storer, adopt LCD to show, and with USB-TTL interface module and compunication, form the multiple functional contactless IC card read/write system of a cover.When IC-card in the zone 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 the storer together, computing machine can be read relevant read/write card information on the computing machine by the USB-TTL interface module again, adds up, form and printout etc. again.

Below the preferred embodiment of the invention is specified, but the present invention is not limited to embodiment, those of ordinary skill in the art also can make all modification that is equal to or replacement under the prerequisite of the invention spirit, the modification that these are equal to or replacement all are included in the application's the scope.

Claims

1. the campus card attendance checking system is characterized in that, comprises central controller and the memory module that is 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 that interconnective USB controller, USB transceiver, clock oscillator reach the UART with whole modem control signals.

2. campus card attendance checking system according to claim 1 is characterized in that, is provided with input circuit in the described keyboard interface module, 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 the 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 the PL2303HX chip.