Patent ID: 8973612
Filing Date: 2015-03-10
Classification: E03C,Y10T

Abstract:
1. A fluid delivery device comprising: an electronic faucet having a plurality of faucet components, the plurality of faucet components including a spout and a manual valve handle to control a manual valve; a primary capacitive sensor coupled to at least one of the faucet components of the electronic faucet to sense a user touching or in proximity to the faucet component, the primary capacitive sensor providing a primary output signal; at least one secondary capacitive sensor located on or near an item which causes unintended effects on the primary output signal from the primary capacitive sensor, each said at least one secondary capacitive sensor providing a secondary output signal; and a controller coupled to the primary and secondary capacitive sensors, the controller determining a difference signal between the primary and secondary output signals of the primary and secondary capacitive sensors, the difference signal being used by the controller to detect when a user touches or is in proximity to the faucet component; wherein the electronic faucet is configured to dispense water into a metal sink basin, the at least one secondary sensor is at least one of a metal plate or electrode located near or coupled to the metal sink basin.