diff --git a/platformio.ini b/platformio.ini
index aab45e2..a88fc5f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -45,6 +45,8 @@ upload_flags =
 platform = ststm32
 framework = arduino
 board = nucleo_l031k6
+build_flags =
+  -Wno-deprecated 
 lib_deps =
     Nintendo Extension Ctrl
 
diff --git a/src/build_opt.h b/src/build_opt.h
new file mode 100644
index 0000000..78f8159
--- /dev/null
+++ b/src/build_opt.h
@@ -0,0 +1,3 @@
+-DENABLE_HWSERIAL2
+-DPIN_SERIAL3_RX=PA10
+-DPIN_SERIAL3_TX=PA9
\ No newline at end of file