Abstract: Uses the surveillance and the management system management system in the dormitory or in the market access may carry on security and the information cue use. Based on AT89S51 monolithic integrated circuit’s control system including four parts: Data acquisition, control system, clock circuit, pronunciation sound recording electric circuit and newspaper sound prompting message electric circuit. This system uses the monolithic integrated circuit to carry on the control, the structure is simple, but may also carry on many kinds of functions the expansions, like realizes many machine communications, carries on the monitoring and the management to a bigger situation and so on.
Key word: Monolithic integrated circuit, monitoring and management, hardware, procedure
1 introduction
In place and so on school dormitory, classroom, library, market accesses, if uses the monitoring and the management system management system, may to the population which passes in and out carry on the statistics, may carries on the warm prompt using the voice recording equipment or the graphic display device the supervisory work, may also must enter the time to carry on processing and so on monitoring warning. Based on AT89S51 monolithic integrated circuit’s monitoring and management system management system, because used the monolithic integrated circuit to carry on the control, simplified the periphery hardware circuit’s design greatly, the system structure was simple. At the same time, this system may carry on many expansions, like realizes many machine communications, carries on the monitoring and the management to a bigger situation and so on.
2 system hardware structures
2.1 structure diagrams
Figure 1 based on AT89S51 monolithic integrated circuit’s monitoring and management system management system’s structure diagram
Shown in Figure 1 is based on at89S51 monolithic integrated circuit’s monitoring and management system management system’s structure diagram. This system has used at89S51 monolithic integrated circuit system control system’s work, uses the pronunciation special-purpose sound recording chip, simultaneously also adds on the clock chip, like this may and the situation needs to carry on the different sound recording according to oneself, sends out the suitable newspaper news number, moreover may also the real time display clock, the calendar and so on, if selects the liquid crystal display electric circuit, but may also carry on the writing to demonstrate, uses in prompting warmly, news or news issue and so on. This place only introduced that realizes the newspaper sound prompt facility using pronunciation IC.
Because this system used monolithic integrated circuit’s software programming to realize controls various modular circuit’s work, and might carry on the parameter through the keyboard the establishment, has realized the automatic control, caused this system becomes more complete, the function were more, simultaneously might carry on the expansion.
2.2 principles of work
1st, hardware composition
Figure 2 various modules unit electric circuit
This system most is small by at89S51 monolithic integrated circuit the system circuit is the primary structure, uses its I/O mouth to carry on the data gathering and the control. Figure 2 is various units electric circuit.
This electric circuit’s principle of work is: First by the wireless pyroelectric human body infrared probe head (37℃) sends out the specific wave length according to the human body constant temperature (10uM) infrared, strengthens after the Philippine putty light filter gathers in the infrared induction source, passes through the pyroelectric part to produce certain electric charge signal and to escort to the monolithic integrated circuit again, this time the monolithic integrated circuit immediately reads the current time, and the time section which establishes before the monolithic integrated circuit carries on the comparison, if discovered that the current time falls, in supposes in the time section scope, sends out the control signal to the recording electric circuit chip, delivers the newspaper sound electric circuit the corresponding time section’s recording content, then enlarges after the amplifying circuit actuates the speaker by the newspaper sound electric circuit, makes the corresponding sound; If discovered that the current time has not fallen, in supposes in the time section scope, then not loud should the wireless pyroelectric human body infrared probe head feed in the signal of stop, namely the behind entire job will work no longer, but is waiting next signal of stop coming.
Various chips and monolithic integrated circuit’s connection is as follows:
①The pronunciation sound recording chip occupies monolithic integrated circuit P0 8 I/O mouth and P2.0~P2.5 altogether 6 I/O mouths; And monolithic integrated circuit’s P0 mouth, P2.0 and P2.1 are separately connected with the ISD2560 address wire, with establishes the pronunciation section the start address. P2.2~P2.5 uses to control records the playback condition. P1.7 uses in recording the key modulation system.
②The clock chip takes monolithic integrated circuit P1.0~P1.2 altogether 3 I/O mouths;
③The keyboard display circuit takes monolithic integrated circuit P1.3~P1.6 altogether 4 I/O mouths.
④Memory E2PROM takes P2.6 and P2.7 altogether 2 I/O mouths
⑤The data acquisition result interrupts the input request signal for outside.
2.3 unit circuit design
1st, monolithic integrated circuit smallest system
This part including two parts: The monolithic integrated circuit is smallest systematic and serial E2PROM. The monolithic integrated circuit smallest system mainly take AT89S51 as a core, on addition electricity reset circuit and clock circuit composition; Turns on serial E2PROM is mainly for after this E2PROM power failure continues related parameter which preserves the system to establish. This electric circuit uses serial E2PROM uses I2C bus interface AT24C01, uses the software simulation the method to realize the I2C main line data transmission.
2nd, data acquisition part
In order to realize to somatic data gathering, this electric circuit sends out the specific wave length according to the human body constant temperature the infrared signal, uses wireless or the wired pyroelectric human body infrared probe head, may a data conversion level signal which gathers trigger through this probe head the monolithic integrated circuit, thus sends out the interrupt request signal. Because this part of electric circuits only act as an interrupt source use in this system, and is not this system’s core electric circuit part, may use an end product the unit module to carry on replaces.
At the same time, thus it may be known, this control system may also establish gathers other types the data to take the interrupt source, revises the control which conveniently serves for other.
3rd, clock chip electric circuit
In order to realize the real-time clock function, this electric circuit has used the high performance which, low power loss clock chip DS1302 as well as some periphery part American DALLAS Corporation produces composes [1], this chip had the clock/calendar function, in the electric circuit has provided two grain of button type reserve battery, guaranteed DS1302 after external power interrupt normal time, after monolithic integrated circuit starting, might calibrate DS1302 through the keyboard the time, the calendar.
4th, pronunciation sound recording chip electric circuit
In order to realize the basis different use situation, sends out the different newspaper sound content, this electric circuit used the pronunciation special-purpose to record ISD2560[2], it had the anti-power failure, the acoustic fidelity to be good, the easy to operate, did not need merits and so on special-purpose development system. The recording session is 60 s, can duplicate records the unconventional 100,000 times. So long as then may input the content which through the microphone to the recording chip you want to input.
5th, keyboard, nixietube display circuit
Electric circuit’s keyboard control and the display circuit use the zlg7289A chip constitution nixietube display circuit achievement to demonstrate [3]. This chip has the SPI serial interface function, does not need the periphery part to be possible direct drive LED, may simultaneously actuate 8 altogether cloudy -like nixietubes (or 64 independent LED) the intelligent demonstration actuation chip, the use is convenient. the zlg7289A interior includes the decoder to be possible to accept the BCD code directly or 16 enters the system code and simultaneously has 2 decoding ways in addition also to have many kinds of control command like blanking ﹑ twinkle ﹑ left shift ﹑ right lateral ﹑ section addressing and so on, the use is convenient. Only use monolithic integrated circuit’s 4 ports.
6th, newspaper sound electric circuit
Used the chip ISD2560 output already to have certain power, could actuate the small speaker normally, but for could enable the newspaper news number which sent out to be more sonorous, let the human realize, in the output had in certain power situation to add two level of amplifying circuits to carry on again to the output signal continues to enlarge, actuated the high efficiency speaker, made a more resounding sound.
3. software design
Figure 3 master routine flow
Figure 4 clock chip flow
Figure 5 interrupt routine flow
The master routine is mainly uses in the system starting or the replacement initialization and transfers each subroutine to complete to overall system’s control, except the general storehouse indicator establishment and to the register which each must use carries on the evaluation in the initialization module, but must to the keyboard display control chip ZLG7289 replacement initialization. The master routine flow chart see Figure 3.
Figure 4 is the clock chip DS1302 procedure flow, the examination operating time to be whether correct, if the user has the revision, uses the user revision result. Figure 5 is its interrupt service flow. After its main process is starting carries on the initialization, examines the pyroelectric part whether to produce certain electrical signal, then compares present’s time and the E2PROM storage time, judges whether needs to broadcast some section of recording the time, if is, then broadcasts the corresponding language, then returns. The E2PROM storage time, the user may the keyboard carry on the input establishment. At the same time, when programming, may establish supposes the computation interrupt the number of times, thus calculates the population which passes in and out. In non-opening hour, if examines the human body signal, then may the output alarm signal.
4. conclusion
This system take at89S51 monolithic integrated circuit as a core, take the wireless pyroelectric human body infrared probe head signal as the interrupt request signal, take the current time as the standard, realizes the control newspaper sound goal through the software programming. This system’s place of innovation is on the system hardware electric circuit is quite simple, uses the part to be few, the electric circuit has the usability, the performance-to-price ratio is high, may facilitate the installment to monitor and manage the place in each kind. This system is convenient expands, like raises the camera to start the control and so on, if must realize the wide range examination and the monitoring, but also re-equips very conveniently primarily - from machine many machine correspondence forms.
Reference:
[1] in comes back to life, Song Xianchun and so on, clock chip DS1302 and in data record application Applications of Electronic Technique in March, 2000
[2] Xiao Hairong, Wang Fengying and so on, designed the micro computer information based on AT89C2051 and the ISD2560 record sound reproducing system in 2004 the 1st issue
the [3] Guangzhou week renders meritorious service monolithic integrated circuit development Limited company zlg7289A 8 LED and 8 8 keyboard control chip shaping guide /upload/eWebUpload/200703/20070312110856345.pdf
