diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..202a30c
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "boil_kettle/src/Arduino-PID-Library"]
+	path = boil_kettle/src/Arduino-PID-Library
+	url = https://git.giacofei.org/Brewery/Arduino-PID-Library.git
diff --git a/boil_kettle/src/Arduino-PID-Library b/boil_kettle/src/Arduino-PID-Library
new file mode 160000
index 0000000..7787498
--- /dev/null
+++ b/boil_kettle/src/Arduino-PID-Library
@@ -0,0 +1 @@
+Subproject commit 7787498eda8955288e99a18d02581a425203bac5