"Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to work creatively with interactive electronics."
You can use it to document the electronics in your arduino project.
The magic combo of your .pde code file and your .fz fritizing files will provide you with sharable documentation for your reference in the future and as inspiration for others.
projectshas some project examples ... including an example using a tri-color [RGB] led
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