by Arodd2000
daisy chain shift registers http://bildr.org/2011/02/74hc595/ http://www.digikey.com/product-detail/en/switchcraft-inc/EHUSBBABX/SC1837-ND/1832371 http://www.l-com.com/usb-panel-mounted-usb-20-adapters-with-shielded-housings-and-high-retention-connectors