Digital Safe - Using the matrix/ membrane keypad, develop a digital sate application that can store up to four user combinations. The combinations are to be a minimum of six digits and can be changed via an included programming mode. The LEDs can be used to indicate the digits being entered and also represent whether the 'lock' has been successfully opened. A different LED can be used for to represent each user lock. For added complexity, a timeout can be applied if an incorrect code is entered and the codes can be stored in the EEPROM (Electrical Erasable Programmable Memory - advanced) so they do not need to be entered every time the firmware is updated, or the processor reset. A method to decide which user is using the system should also be considered.

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Topological Sort

Topological sort is a sorting technique that sets up a hierarchy in a process. In this technique, when a directed network has nodes connected by arrows, the root node is placed before the successor node.