Connecting Arduino To Unity 3D on Mac Issues

i have arduino uno got on ebay, able 3 led on , off sequence work file contains in project down load test out communication arduino serial port on mac. project trying follow here:
http://r3dstar.co.uk/?p=211

i new arduino having trouble understanding needs changed in code.
my serial or port on:
/dev/cu.webusbserial1420

in unity 3d code c# tried changing serial this:
public static serialport sp = new serialport("/dev/cu.webusbserial1420");

but still error messages saying can't open port, guess not understanding in code.

if has mac , has tried project out love know how got yours work.

thanks.

i figured out!! turns out typing in "web" when should have been "wch" part of serial port on mac.
back school me reading lessons again lol

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