diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..f7e01f0
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "modules/pico-onewire"]
+	path = modules/pico-onewire
+	url = https://github.com/adamboardman/pico-onewire.git
diff --git a/modules/pico-onewire b/modules/pico-onewire
new file mode 160000
index 0000000..d5af2a1
--- /dev/null
+++ b/modules/pico-onewire
@@ -0,0 +1 @@
+Subproject commit d5af2a1e1d81c3cb21805e332c8185607ee74b1d