A circuit board for interfacing to a flow sensor with piezo elementsgenerating a flow signalindicative of flow of a fluidic medicament, comprising a base comprising aplurality of electricalcircuit traces； a first pair of spring contacts for a first piezo element,mounted to the base inelectrical communication with a electrical circuit trace； a second pair ofspring contacts for asecond piezo element, mounted to the base in electrical communication with anelectrical circuittrace； and pins in electrical contact with the plurality of electrical circuittraces. Each spring contactpre-configured with the bias against said first and second piezo elementsbeing equivalent, thecircuit traces configured such that each pin is in electrical communicationwith a single springcontact.
