singlechip also call single-chip microcomputer,it is a sort of micro-controler integrated by CPU,RAM,ROM,timing,counting and varieties of interfaces.the 51 singlechip is the most typical and representive one thereinto,it has extensive application in all realm.
the topic has designed a sort of music doorbell which is controled by the singlechip AT89S51.the music doorbell system is consisted of the singlechip small system ,extand LED display and the sound circuits.programing with singlechip assemble language,reach the result of alarming when pressing the button,and displaying note synchronism
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In the hardware aspect, except the monolithic outside the aircraft, uses four seven section of LED nixietubes to carry on the demonstration, LED uses is the dynamic scanning demonstration, uses the 74LS14 chip to carry on the actuation. Note correspondence fixed time interrupt starting value can the quite accurate demonstration transform which through LED, a pressed key causes the musical doorbell to resound. The software aspect uses the assembly language programming, used the SLISP software to carry on the online procedure fever to write, has involved the monolithic integrated circuit fixed time with the interrupt use.
Completes the system after inserts the power source to move continuously normally, after passes through period of time also not to have any exceptionally, the movement is very stable. Because has the musical doorbell basic function, therefore may consider fixes it in the gate, acts as the doorbell, the manufacture cost is not high, has certain practical value.
