Briefly, the system also integrated two micropumps and five microvalves (Lee Company, Essex, CT),
all of them electrically actuated. A homemade power supply and multiplexor was used to control these liquid actuators. This controller was connected to a data-acquisition card (NI-USB6259, National Instruments, Austin, TX), and the instrumentation was completed with a PC.
The communication between the PC and the data-acquisition card was performed through a USB board and employing software programmed with LabView graphic language (National Instruments).