diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..6792a7a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "PCF8574T/RPI-PICO-I2C-LCD"]
+	path = PCF8574T/RPI-PICO-I2C-LCD
+	url = https://github.com/T-622/RPI-PICO-I2C-LCD
diff --git a/PCF8574T/RPI-PICO-I2C-LCD b/PCF8574T/RPI-PICO-I2C-LCD
new file mode 160000
index 0000000..fe0ff65
--- /dev/null
+++ b/PCF8574T/RPI-PICO-I2C-LCD
@@ -0,0 +1 @@
+Subproject commit fe0ff65c0984fbd93b7e887c5c03f8b4caadf76d