diff --git a/.gitmodules b/.gitmodules
index 6a0f0de..192571c 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -43,3 +43,6 @@
 [submodule "eris-flake"]
 	path = eris-flake
 	url = https://codeberg.org/eris/nix-eris
+[submodule "watch-firmware"]
+	path = watch-firmware
+	url = https://github.com/joeycastillo/Sensor-Watch
diff --git a/watch-firmware b/watch-firmware
new file mode 160000
index 0000000..801230c
--- /dev/null
+++ b/watch-firmware
@@ -0,0 +1 @@
+Subproject commit 801230cc3ab910af73a56738f9b539597e15fa56