Description: Password lock design. 4* 4 keypad (0-9, clear, entered, changed), a separate button for system reset, password-down save. With LCD display, display the password using the* required six passwords. A: When you change the prompt " Enter the old password:" requires twice correctly, required to give prompt: Enter the new password, this operation is also 2 times, if you enter invalid (less than 6), suggesting that change is unsuccessful. B, input, three consecutive unsuccessful, buzzer alarm and lock the keypad. Not out until reset password is entered successfully, the output from a port 1, and gives a short music. (2)
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100220321密码锁lcd最终版.txt
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