Fritzing at http://fritzing.org/But pleas don't use it, those sort of diagrams are crap at communicating what you are trying to do to a grown up.
if Fritzing does shorten the learning curve for many that dont really have an interest to deepen their knowledge on the electronics side of things more than they have
attacking an open source program like Fritzing just for the sake of purist pride is not the way to go.
So, dont see nowt wrong with being practical, if that is easier
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