Yup, colleague says he designed and built several different sip & puff controls for various things. >I wonder how much work it would be to put together somethi

Yup, colleague says he designed and built several different sip & puff controls for various things. >I wonder how much work it would be to put together something like an Arduino-based device that takes morse-like input and simulates a USB or Bluetooth keyboard? IMO it has never been easier.