Motor_Minder monitors the speed and revolution count of a motor using a shaft encoder.
It was tested with the Melexis 90217 Hall-Effect Sensor (Parallax 605-00005) and a single
magnet mounted (Parallax 605-00006) on the motor shaft. It should work with any type of
sensor that puts out one pulse per revolution. The object runs in a new cog updating
varibles in the calling cogs address space.