diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..640cf9d
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "arduino/CommandStation-EX"]
+	path = arduino/CommandStation-EX
+	url = https://github.com/DCC-EX/CommandStation-EX.git
+[submodule "arduino/dcc-ex.github.io"]
+	path = arduino/dcc-ex.github.io
+	url = https://github.com/DCC-EX/dcc-ex.github.io
+[submodule "arduino/WebThrottle-EX"]
+	path = arduino/WebThrottle-EX
+	url = https://github.com/DCC-EX/WebThrottle-EX
diff --git a/arduino/CommandStation-EX b/arduino/CommandStation-EX
new file mode 160000
index 0000000..92591c8
--- /dev/null
+++ b/arduino/CommandStation-EX
@@ -0,0 +1 @@
+Subproject commit 92591c8a2ef12707477ad702fc10e51a24503149
diff --git a/arduino/WebThrottle-EX b/arduino/WebThrottle-EX
new file mode 160000
index 0000000..37dcc1e
--- /dev/null
+++ b/arduino/WebThrottle-EX
@@ -0,0 +1 @@
+Subproject commit 37dcc1e9c118c4b324d0ffeb03c6e60d4bb2a2b4
diff --git a/arduino/dcc-ex.github.io b/arduino/dcc-ex.github.io
new file mode 160000
index 0000000..d59b520
--- /dev/null
+++ b/arduino/dcc-ex.github.io
@@ -0,0 +1 @@
+Subproject commit d59b520586a7b48da0194443ad2eb35263534ca6