Abstract: A method of controlling a flow of liquid includes calibrating a PSD infrared sensor associated with the spout. The calibrating includes turning on the spout to thereby dispense a stream of liquid from the spout and into a stream space; emitting infrared energy from the PSD infrared sensor and toward the stream of liquid; sensing a first position of the infrared energy after the infrared energy has been reflected back to the sensor from the stream of liquid; storing first information based upon the first position of the reflected infrared energy; turning off the spout to thereby inhibit the liquid from being dispensed from the spout; sensing a second position of the infrared energy after the infrared energy has been reflected back to the sensor from an object that is fixed relative to the sensor; and storing second information based upon the second position of the reflected infrared energy. Infrared energy is emitted from the PSD infrared sensor and toward the stream space.

Abstract: Methods and systems are described for sensing force information at a plurality of points on a continuous surface, and detecting contextual information about an object on the surface based on the distribution of force on the surface. For example, a plurality of sensors may be included below different points on such a substantially continuous surface, where the sensors are operable to sense force information. Then, a processor connected to the sensors may determine a location of the object relative to the surface, based on the force information from the sensors.