Ultimately (outside the scope of this article) to incorporate what I learn into the Video Switcher to act as a 'bridge'between USB and the original parallel port input.As this will be using the existing Arduino IDE's Virtual COM port,it should be much easier to write than grappling with the Velleman K8055 DLL methods and procedures! To write a simple Windows application (in Delphi) to control the 'Arduino' digital output pins, similar to the applicationsupplied with the Velleman USB Interface.To interface the 'DIY' Arduino with either a Sparkfun Breakout Board for FT232RL USB to Serial or a ByVac Low Cost USB to Serial board - or even try both!.To build a 'minimal' stand-alone Arduino on its own PCB (Stand-alone Arduino).The original Video Switcher design only needed three data output lines from the PC's parallel port to selelct the cameras, sothis seemed like a good opportunity to bring together a few bits and pieces and 'concepts' that I'd been thinking aboutfor the Arduino specifically:
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