I'm looking for a common "wireless gadget" with a rotary encoder that can be accessed by an Arduino. Background: I need a portable rotary encoder to create a simple way to control model railway locomotives. The only one I have found so far is a wireless mouse where the scroll wheel can be easily used as rotary encoder.
But they usually are using USB on the PC side which is not that easy to handle by Arduino. Does anybody knows about other common "wireless gadgets"?