I have an Arduino Duemilanove that I have used for various tasks (including signaling servos). When I got Sparkfun's Wifly shield I was unable to get it working. I then got an Arduino Uno which (surprise) did work with the shield. This leads me to believe that somehow I have damaged my original Arduino. I suspect that it may have been due to controlling a servo.
I am aware of the Servo library and have successfully used it in the past. I am controlling a regular servo (steering servo) and a brushless motor (from a 35A ESC, which the servo plug is attached to) on this R/C car.
However I'm wondering if there is potential for damage to the hardware under certain situations. Of course I won't be powering any motors off of the Arduino itself, but do I have any guarantees that the signal pin of a servo won't draw too much power or do something else that may be a problem?
I could come up with a voltage follower circuit, which might be safer. I'd need to find some op-amps for that, though.