diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..8061c93
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "hoverboard-firmware-hack-foc-serial-esc"]
+	path = hoverboard-firmware-hack-foc-serial-esc
+	url = https://repos.ctdo.de/interfisch/hoverboard-firmware-hack-foc-serial-esc
diff --git a/hoverboard-firmware-hack-foc-serial-esc b/hoverboard-firmware-hack-foc-serial-esc
new file mode 160000
index 0000000..f302ff8
--- /dev/null
+++ b/hoverboard-firmware-hack-foc-serial-esc
@@ -0,0 +1 @@
+Subproject commit f302ff80417fcf72c9fbe2671864332199252091