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Is there an Arduino question in there somewhere? I have no clue what you are doing/attempting to do, from that description. Can you make the description a bit more simple for us old folks? How did you get this far without thinking about a coordinate system?
Paul
Please don't waste your or our time with a useless Fritzing diagram. Take a photo of a hand drawn diagram (with pins and parts clearly identified) and post that.
What "coordinate system"? Your post is incomprehensible without a clear description of the mechanism. Please post a drawing of that, too.
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