diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..177b661
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "arduino/lib/rc-switch"]
+	path = arduino/lib/rc-switch
+	url = https://github.com/sui77/rc-switch.git
diff --git a/arduino/lib/rc-switch b/arduino/lib/rc-switch
new file mode 160000
index 0000000..c4ac566
--- /dev/null
+++ b/arduino/lib/rc-switch
@@ -0,0 +1 @@
+Subproject commit c4ac56633a3b0c8f16f13f5acdfed9e284c554ea