Provided herein are systems and methods which use the solenoid itself to sense the position of the armature within the solenoid, and therefore to determine the position of the solenoid's armature, and or any related devices whose movement is dependent on the armature's movement. Specifically, a system in which the change in self-induction that occurs when the armature moves relative to the solenoid coil is used to detect the location of the armature.