diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000000000000000000000000000000000..12b076ddd1b9706fbee683554c45672fa72687a4
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "pi-mqtt-gpio"]
+	path = pi-mqtt-gpio
+	url = git@github.com:w4tsn/pi-mqtt-gpio.git
diff --git a/pi-mqtt-gpio b/pi-mqtt-gpio
new file mode 160000
index 0000000000000000000000000000000000000000..ac94f732da5e20baa7cdbfd0966ca1084513da76
--- /dev/null
+++ b/pi-mqtt-gpio
@@ -0,0 +1 @@
+Subproject commit ac94f732da5e20baa7cdbfd0966ca1084513da76