In the large-scale organ , in the hotel and hospital , often need a kind of inside and get in touch with and call out the system, in order to set up essential contact between passenger (patient ) and attendants. And general inside conversation system little, it uses to be cheap call instruct these kind of call that this text recommend point out the system is while briefing on often, can show the number that is each called out with the video (room number or berth number). Its other advantages are: This kind is pointed out the systematic structure is relatively simple by call that little controller makes up , with low costs, operation is very convenient too.
This subject has recommended a kind of one-chip computer to call out the systematic design plan . Is it call out system adopt AT89s52 one-chip computer as programming controller , one-chip computer this suitable for plane , electricity , appearance integrated intellectual products to it's time, advantage of have high , low consumption of precision , control ability , small and exquisiting etc.. And adopt ADC0809 to imitate the voltage to change into the digital form . Establishes using the procedure to the monolithic integrated circuit for outside severs and the computation severance time. P0 port separately with digital tubesection code connected, the P2 port is separately connected with the digital tube position code.
Key words: microcontroller computer;program;thenumber managing;
ADC0809;AT89S51;Calling system