Matrix keyboard combination lock design According to set a password, password is realized by using 4 x4 matrix keyboard input function. After the password correctly, the lock is open (green light), after 10 seconds, the lock automatically closed (red light) If three consecutive input password is not correct, and then lock button for 5 seconds, at the same time issued a warning (yellow light flash), after 5 seconds, remove key lock, password recovery

51_Lock_Matrix keyboard\8421.c
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51_Lock_Matrix keyboard

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