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bi-color LED sketch will not work?

I have downloaded the BiColorLED.pde sketch but I cannot get it to work and I cannot figure out what I am missing?
I am trying to follow the Basic exercises on a Mac using Arduino, but I cannot get this one to work.

iceng1 year ago
Your LED could be Common Anode or Common Cathode requiring radically different hook-up wiring !

Then there is the matter of your software code ?

Hope your not using stra-wire...

A
atlas2 (author)  iceng1 year ago
Thanks for your feedback, I will check further and see if I can find something
Post a link.
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