diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..7733770
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk.git
diff --git a/pico-sdk b/pico-sdk
new file mode 160000
index 0000000..ee68c78
--- /dev/null
+++ b/pico-sdk
@@ -0,0 +1 @@
+Subproject commit ee68c78d0afae2b69c03ae1a72bf5cc267a2d94c