Comment by vvanders

It's not quite the solution you're looking for but the GMG/Traeger pellet stove/smokers are pretty much this. They've got a controller + fan and auger. You can pretty much set em and leave them alone for a few hours(depending on what temp you're grilling/smoking for).

We've got a small one and it's an amazing little machine, with the bonus of being able to select what type of wood you're burning as well.