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  1. I am working slowly on my project. I thought I might post what could be a useful DipTrace base layout for a shield to use with the Analog Shield on an Arduino Uno . It could even be useful to somebody making an unrelated shield for Uno by stripping out the P1, P2, and P3 headers on the left and adjusting the board outline. The component designations and pin numbers match those of the Analog Shield. My board may end up bigger than the Analog shield, but I have put a board outline into the file that matches the 2.1 by 3.1 inch dimensions of the Analog Shield. I think it is correct, but I have not had a board built. I made a copy of my in-progress layout, and stripped out the components. The Analog Shield uses Uno D2,D3, D5, D6 (P7-3,4,6,7) for its data to or from the Uno. As an aside, on my specific project, I have a Sainsmart 2x16 LCD Keypad-Shield that will go atop my custom shield. As far as I can tell, that uses Arduino signals D4,D5,D6,D7,D8,D9 and AD0. The Uno uses D13 for its LED, but could be shared in a pinch. That would seem to leave me with Uno D0, D1, D11, D12 to use for my own use by my shield. I expect to only need 1 or 2 Uno output port pins to my exclusive use. Any opinions as to which is/are most likely to be available, even if I upgrade to a different display shield in the future? Attached PDF is expanded scale. Bluish-gray is bottom silk. Green is top silk. Blue lines are ratlines for some of the grounds, and may be ignored. 1. I hope the DipTrace layout is useful to somebody. 2. Suggestions are encouraged. Analog_Shield_Base.dip img_ Analog_Shield_Base.pdf