Hey,
This is a great idea, I've been looking for a few automotive applications for Arduino for a while. The way I imagined this was a series of pivoting slats controlled by R/C aircraft style micro servos. I also thought about adding in control from the brake lights. i.e. if the temp is above a set minimum, then the grill opens up whenever the brakes are applied, adding alight aero braking and "free" cooling.
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