In this design, the electronic code lock use STC89C52 SCM using C language by Proteus software simulation and physical welding. Electronic lock matrix keyboard for password input, 1602A LCD module for display. Its function can be realized: (1) by switching the input four passwords to display or hide (2), right or wrong of the decryption by light-emitting diode and buzzer sound and light alarm (3) 4 (4) In the case of password is lost, the initial password for password re-set password is modified (5) the AT24C02 external memory to complete the power-off password protection (6) have 1-9 times the number of unlock any set given function (7) analog password box randomly generated password, and decoding. The design features of the LCD module using the 1602A, which makes the display more intuitive, easier to use. The password can show and hide the switch, by hiding the password to a password-protected.

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