With a bit of wire cutting and soldering, it's easy to connect your LEGO Power Functions components to the Arduino (or any other microcontroller) and create interesting hybrid projects. Here's a demo with a DC motor and a motor driver. Be warned that this process will void any warranty for the LEGO, so if you attempt this, be sure you understand what you're doing and do it at your own risk. Also, remember that these LEGO components work at 9V, which is incompatible with Arduino I/O, so be extra careful with signal conversions and routing. I am not affiliated with LEGO in any way (but I like it :) ).

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