There is a single chip program lock, the specific function is This example illustrates how to use the 8051, LCD monitor and 4 ⅹ 4 small keyboard, making a Close Code lock. PORT 1 LCD monitor connected to the data lines. PORT 3 of the P3.3, P3.4 and P3.5 points Do not LCD monitor connected to the control line. PORT 2 is connected to 4 ⅹ 4 keypad, you can enter the password. Implementation of the procedures or time to change the password, the first LCD monitors to display the time and date. 4 ⅹ 4 when the user presses the button A small keyboard, you can enter the password. If the password is correct, it The LED will flash P3.6, that opens the lock. If the password is not correct, LCD display will Show "PASSWORD WRONG". When the user presses the 4 ⅹ 4 button keypad, B, can be modified. 4 ⅹ 4 when the user presses the button on the keypad C, you can change your password.*/

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