For you that want security when keeping your stuff and don't wanna carry keys, this safe is the ideal one. Robotized with a NXT 2.0 set, it receives 5 passwords from 0 to 99 and, as long as all are correct, it opens automatically. After the opening and closing of the door, it locks automatically and ends the program. If an incorrect password is given, the program ends immediately. All the safe's "covering" was built with LEGO System & Duplo (only the bottom was made with cardboard, owing to lack of pieces...). Here's the video:
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