Arduino lights & accessories using battery power

Has anyone played around with their board and an Arduino?
Im not sure yet, but my thinking was to the connect my board lights to a light sensor which will turn the lights on when I have the board on and the light outside is low automatically.

Also when I turn my board off the lights turn off. Too many times I have jumped on my bus to stares from others to notice that my rear light is still flashing. Ideally I would also have the skateboard battery charge the lights so I don't have to remove the lights to charge (but I can if i need too).

Totally third world problems, but just thought it could be an interesting hack. I doubt an arduino would even fit inside the battery cover.

 

I really like this idea!