1. An occlusion detection system for detecting an occlusion in a fluid path of an infusion pump with a reservoir containing fluid for delivering fluid to a user, the occlusion detection system comprising: a housing; a motor contained within the housing; one or more drive train components that react to stimulus from the motor to force a fluid from a reservoir into the user; a sensor positioned to measure a parameter associated with the motor or a drive train component, wherein the sensor produces three or more output levels across a range of measurements; and an electronics system that processes the three or more output levels to declare when an occlusion exists.