Abstract
This article introduced the systematic ideas of design project and the principle picture at first, and then has expounded the purport of the design of the Electronics Password Lock with the warning system. This article analyzed the hardware of the whole system and software design in partition organization, in the part of hardware we has introduced Power supply circuit, MCU AT89C51 controls chip, peripheral circuit ,24C02 EEPROM circuit, Row and column key’s numeral input circuit, figures tube show circuit, control circuit, and alarm control circuit, etc. The part of the software carries on programming to some concrete module. the whole system is adopted the communication way of the MCU,and the article also introduce the communication situation of I/O port of MCU and how to facture PCB board, install how to install and debug it.
Keyword: electronics. Passwordlock. MCU. keyboard. alarm system. Debug
