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Description: using DTMF the security code is generated and should display in the 16*2 LCD - first row should display the text CODE LOCK SYSTEM, if we generate any interrupt it should display "ENTER PASSWORD" in the first row. Then in the second row the password (four characters should display) and if the password matches, the system should display correct password and if it is wrong then the system should display wrong password with a beep sound. After three wrong password attempts the system should not be active for a minute (using WDT).
