ptu46: Directed Perception ptu46 pan/tilt driver
Driver for the Directed Perception ptu46 pan/tilt driver, forked from player
ptu46 implements the driver and node for Directed Perception PTU-D46 pan tilt unit. Specifically it was developed on the PTU-D46-17.5.
The driver send commands to the PTU using arbitrary "count" units, which the driver converts into radians.