The GP2Y0A21 Sharp distance sensor is a great way to add obstacle avoidance or motion sensing to your robot or any other project. With a detection range of 4" to 32" and an analog voltage indicating the distance, this sensor is very easy to use.
This is a spool of Fiber Optic Cable with slip ring for tethered control systems. It includes the media converters and provides a transparent ethernet connection that is 1km long. Different lengths can be requested.