Mad maker
MadMaker is a six-week online challenge aimed at Year 10 students to educate them about embedded and control systems and their use in everyday life. It involves using Arduino Esplora boards to investigate fun and interactive ways to use science, technology, engineering and maths to solve real-world problems.
http://sydney.edu.au/engineering/high-school/mad-maker.shtml
A link to logic gates and an interactive tutorial
http://dspace.jorum.ac.uk/xmlui/handle/10949/14092