diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+# These are files and directories that the user is instructed to create during
+# the normal build process. Don't offer to commit them to git.
+*/build
+pico-sdk
+
+# Ignores like this that are specific to operating environments are better
+# expressed in your user-global ignores, because every environment creates
+# different junk. However, out of expediency, these are ignored anyway:
+.DS_Store
diff --git a/MCUME_pico2/bin/.DS_Store b/MCUME_pico2/bin/.DS_Store
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diff --git a/MCUME_pico2/build/.DS_Store b/MCUME_pico2/build/.DS_Store
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diff --git a/MCUME_pico2/config/.DS_Store b/MCUME_pico2/config/.DS_Store
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diff --git a/MCUME_pico2/display/.DS_Store b/MCUME_pico2/display/.DS_Store
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diff --git a/MCUME_pico2/fatfs/.DS_Store b/MCUME_pico2/fatfs/.DS_Store
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diff --git a/MCUME_pico2/pico64/.DS_Store b/MCUME_pico2/pico64/.DS_Store
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diff --git a/MCUME_pico2/pico8086/.DS_Store b/MCUME_pico2/pico8086/.DS_Store
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diff --git a/MCUME_pico2/picocastaway/.DS_Store b/MCUME_pico2/picocastaway/.DS_Store
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diff --git a/MCUME_pico2/picogb/.DS_Store b/MCUME_pico2/picogb/.DS_Store
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diff --git a/MCUME_pico2/picogen/.DS_Store b/MCUME_pico2/picogen/.DS_Store
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diff --git a/MCUME_pico2/picomsx/.DS_Store b/MCUME_pico2/picomsx/.DS_Store
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diff --git a/MCUME_pico2/picopce/.DS_Store b/MCUME_pico2/picopce/.DS_Store
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diff --git a/MCUME_pico2/picosms/.DS_Store b/MCUME_pico2/picosms/.DS_Store
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diff --git a/MCUME_pico2/sd_driver/.DS_Store b/MCUME_pico2/sd_driver/.DS_Store
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diff --git a/MCUME_pico2/usb_kbd/.DS_Store b/MCUME_pico2/usb_kbd/.DS_Store
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