A pixel includes a load, a transistor which controls a current supplied to the load, a storage capacitor, and first to fourth switches. The wireless communication module includes an RF interface, a processor and a selectable multiple protocol interface. without lowering the productivity. This supports the creation and the editing of a series of commands and data stating a pattern of robot movements. When an array of such vertical stacks is used, horizontal side outlet ports for the concentrate streams can be likewise interconnected to provide combined concentrate outlet streams.