diff --git a/.gitmodules b/.gitmodules
index 5ada61b..5094ce8 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -7,3 +7,6 @@
 [submodule "libraries/Adafruit_SGP30"]
 	path = libraries/Adafruit_SGP30
 	url = https://github.com/adafruit/Adafruit_SGP30
+[submodule "libraries/Adafruit_BusIO"]
+	path = libraries/Adafruit_BusIO
+	url = https://github.com/adafruit/Adafruit_BusIO
diff --git a/libraries/Adafruit_BusIO b/libraries/Adafruit_BusIO
new file mode 160000
index 0000000..a8c9c51
--- /dev/null
+++ b/libraries/Adafruit_BusIO
@@ -0,0 +1 @@
+Subproject commit a8c9c5183c17ca3ac620d9f825e24a013a10875e