Abstract
A door system using password can be a security system which is used to protect valuable products from outsiders. In this case, a door protected with password is used to protect facilities or valuable documents in a room. This research is conducted by developing a prototype of door system which is equipped with alarm as an indicator if there are some mistakes in entering the password three times in a row; LCD as a displayer; keypad as a media to enter the password; and microcontroller ATMega8535 as a controller. The final result is a door’s security prototype using password in which door can only be opened if the password is correct. On the the contrary wrong password inserted in, the door can not be opened.
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