diff --git a/src/drivers/camera_trigger/CMakeLists.txt b/src/drivers/camera_trigger/CMakeLists.txt
index 8674c222d7..1a1491dbe3 100644
--- a/src/drivers/camera_trigger/CMakeLists.txt
+++ b/src/drivers/camera_trigger/CMakeLists.txt
@@ -39,6 +39,9 @@ px4_add_module(
 	SRCS
 		camera_trigger.cpp
 		camera_trigger_params.c
+                interfaces/src/camera_interface.cpp
+                interfaces/src/pwm.cpp
+                interfaces/src/relay.cpp
 	DEPENDS
 		platforms__common
 	)
diff --git a/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp b/src/drivers/camera_trigger/interfaces/src/camera_interface.cpp
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/drivers/camera_trigger/interfaces/src/camera_interface.h b/src/drivers/camera_trigger/interfaces/src/camera_interface.h
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/drivers/camera_trigger/interfaces/src/pwm.cpp b/src/drivers/camera_trigger/interfaces/src/pwm.cpp
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/drivers/camera_trigger/interfaces/src/pwm.h b/src/drivers/camera_trigger/interfaces/src/pwm.h
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/drivers/camera_trigger/interfaces/src/relay.cpp b/src/drivers/camera_trigger/interfaces/src/relay.cpp
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/src/drivers/camera_trigger/interfaces/src/relay.h b/src/drivers/camera_trigger/interfaces/src/relay.h
new file mode 100644
index 0000000000..e69de29bb2