Abstract: An apparatus and method are provided for optical liquid level determination in a liquid dispensing system. Accurate volume dispensing based on the level determination is also provided. An optical sensor device emits a light signal downward into the tank toward the liquid, and received a portion of the light signal that has been reflected upwardly by a surface at the top of the liquid. A processing system calculates the height of the liquid in the tank based on a time of flight measurement of the light signal. A head pressure of the liquid over a controllable dispensing valve located at the bottom of tank may then be calculated using the calculated height of the liquid in the tank. An open time for the controllable dispensing valve is then calculated, based on the calculated head pressure, in order to dispense a predetermined volume of liquid from the tank.

Abstract: The present disclosure is directed to a user input system and method for receiving and processing touch input. The system may cooperate with an interchangeable graphic module that may be received in an overlapping relationship to a touch sensor panel of the system. The interchangeable graphic module may have a graphical layout having one or more graphical elements visually marked on the interchangeable graphic module. A user may view the graphical elements and provide touch input to the touch sensor panel. The user input system may be configured by obtaining a graphic code associated with the interchangeable graphic module identifying the particular graphical layout. The system may configure soft-keys for the touch sensor panel corresponding to the graphical elements. Therefore embodiments of the user input system may provide a configurable touch input system presenting graphical elements without requiring an electronic display.