Guidance on active spoiler for race car

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here's proposal:

i want build active-aerodynamic spoiler using arduino uno.

i use sense car motion, 1 axis...  under braking, want spoiler go full-up maximum downforce , braking.  under steady speed or acceleration, want spoiler move flat or no-drag position.

for input, proposing using adafruit accelerometer breakout board...  http://www.adafruit.com/products/163

for position sensing, use sparkfun rotary encoder.  use contacts , simple on-off, since it's two-position, more elegant solution use arduino brain, since adjust behavior code only. 

for servo/actuator, thinking strongest, cheap unit automotive 12v window motor.  should strong enough lever advantage...  not super fast, it.

thoughts??  easy relative novice?  (only few tutorial-type projects under belt...)  care brudda out code/advice?

thanks in advance...

i start mechanical stuff (servo, spoiler, etc). may drive full speed , while breaking go spoiler full-up simple switch. when still alive continue code :)


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