Patent attributes
A tilt switch based on differential threshold sensing includes a tilt track (such as a tilt tube), and a tilt/target element moveable along the tilt track by gravity between first/second ends based on tilt angle. An inductive sensor includes first/second sense coils at the ends of the tilt track, and sensor circuitry (a) to drive each sense coil to project a magnetic sensing field, and to measure a differential sensor to a position of the tilt/target element relative to the sense coils, based on a property corresponding to sense coil inductance (for example, relative to a pre-defined switching threshold position), and (b) to provide, in response to the differential sensor response, a tilt switch output corresponding to a tilt angle of the tilt track based on a position of the tilt/target element relative to the sense coils (or switching threshold), for example, with a pre-defined hysteresis.
