diff --git a/src/external_lcd.cpp b/src/external_lcd.cpp
new file mode 100644
index 0000000..cac60f5
--- /dev/null
+++ b/src/external_lcd.cpp
@@ -0,0 +1,5 @@
+#include <external_lcd.hpp>
+void ExternalLCD::callTriggerFunction() {
+    uint8_t touch_hex = Serial2.read();
+    external_lcd_callback(touch_hex);
+}
\ No newline at end of file