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From outside of Altium, go to altium-core/starter-projects/ and copy the folder "major-key-starter." Copy it into the folder called "working," and change its name to "major-key-<your-name>." Go into that folder and double-click on "major-key.PrjPcb" (possibly just showing up as "major-key") to open it in Altium.
 
From outside of Altium, go to altium-core/starter-projects/ and copy the folder "major-key-starter." Copy it into the folder called "working," and change its name to "major-key-<your-name>." Go into that folder and double-click on "major-key.PrjPcb" (possibly just showing up as "major-key") to open it in Altium.
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===Check Out The Schematic===
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From Altium, look at the Projects panel, and expand major-key. Open "TopSheet.SchDoc."
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This document is the "top sheet" (hence the name) for the project. A board in Altium consists of one or more "sheets," pages of the electrical schematic. They are arranged hierarchically - every design with more than one sheet needs a "top" sheet and then "subsheets," which can be nested an arbitrary number of times (subsheets can have subsheets, which can have subsheets, which can have subsheets...) The green box (known as a "sheet symbol") represents a subsheet, containing the schematic for an Arduino microcontroller. You can open that sheet either from the Projects panel or by hitting {{altium-shortcut|ctrl + double click}} on the sheet symbol.
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We won't need to edit the subsheet for this project, but it may prove helpful to look at as an example of what an Altium schematic can look like.
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