For a project, we're looking into feeding "Yaw and Pitch" values to a two-axis servo setup. (http://www.lynxmotion.com/Product.aspx?productID=287&CategoryID=61)
The idea is: we put a sensor on the head of a person. And a robot, thanks to this servo setup, folows the head movements of that person in real time. (yaw and pitch).
So we have the servos are another matter all together. We tought we could get away with just a two axis accelerometer / or maybe a two axis gyroscope (like the wii motion plus).
It turns out to be way more difficult then that. So now I'm starting to believe we might need a 9DOF sensor package, and some really confusing code to boot. (Kallman Filters?)
So this: seems like a solution now: http://www.sparkfun.com/commerce/product_info.php?products_id=9623
There's working code written for that one, but it's way to expensive for our budget.
So - Yaw and Pitch from somebody's head. That's what we need. A small sensor would be ideal. But it seems to be difficult and expensive.
Anyone among you who has built something like this? Care to send some wisdom my way? Thanks!