Sensor assembly for faucet

A system for controlling a flow of water through a faucet that provides water to a sink, the sink having a basin and a rim, the rim defining at least one faucet hole for mounting the faucet to the rim and defining an accessory hole spaced apart from the at least one faucet hole, the faucet having an outlet for discharging water into the basin, the system comprising:

• a shank configured to pass through the accessory hole, the shank terminating on one end at a flange located on a first side of the rim, the flange having a first side and a second side, the first side configured to interface with a base of a head, the base comprising a hole and the base configured to be supported by the first side of the rim;
• circuitry positioned within the base and interfacing with the second side of the flange, the circuitry separated from the rim by the flange and having a central portion that overlays the shank and an outer portion that extends radially outward from the central portion and beyond a circumference of the shank;
• and
• a nut threadedly coupled to the shank and configured to be supported by a second side of the rim opposite the first side of the rim such that tightening the nut on the shank secures the base on the first side of the rim and secures the nut on the second side of the rim.

A kit for retrofitting an existing faucet system for touchless operation, the existing faucet system including a faucet having an outlet for discharging water from the faucet into a basin, the kit comprising:

• a proximity sensor assembly comprising:
• circuitry;
• a head having a base, the base having a first side configured to be supported by a first side of a wall and the base having a second side configured to interface with a first side of a flange of a shank, wherein the shank terminates on one end at the flange, and wherein a second side of the flange supports the circuitry within the base;
• and
• a nut threadedly coupled to the shank and configured to be supported by a second side of the wall opposite the first side of the wall such that tightening the nut on the shank secures the head on the first side of the wall and secures the nut on the second side of the wall;
• wherein the circuitry has a central portion that overlays the shank and an outer portion that extends radially outward from the central portion and beyond a circumference of the shank.