diff --git a/ino/lib/McopySerial/McopySerial.cpp b/ino/lib/McopySerial/McopySerial.cpp
index d764af3..d8e40c4 100644
--- a/ino/lib/McopySerial/McopySerial.cpp
+++ b/ino/lib/McopySerial/McopySerial.cpp
@@ -13,12 +13,20 @@ void McopySerial::begin () {
 char McopySerial::loop () {
 	if (Serial.available()) {
 		cmdChar = (char) Serial.read();
+		internal();
 	} else {
 		cmdChar = 'z';
 	}
 	return cmdChar;
 }
 
+void McopySerial::internal () {
+	if (cmdChar == DEBUG) {
+		debugOn = !debugOn;
+		cmdChar = 'z';
+	}
+}
+
 void McopySerial::setBaud (int baudRate) {
 	baud = baudRate;
 }
diff --git a/ino/lib/McopySerial/McopySerial.h b/ino/lib/McopySerial/McopySerial.h
index 1b29d1b..505430f 100644
--- a/ino/lib/McopySerial/McopySerial.h
+++ b/ino/lib/McopySerial/McopySerial.h
@@ -10,6 +10,8 @@ class McopySerial {
 	volatile bool debugOn = false;
 	volatile char cmdChar = 'z';
 
+	void internal ();
+
 	public:
 
 	/* CMD FLAGS */
diff --git a/ino/mcopy_cam_canon/McopySerial.cpp b/ino/mcopy_cam_canon/McopySerial.cpp
index d764af3..d8e40c4 100644
--- a/ino/mcopy_cam_canon/McopySerial.cpp
+++ b/ino/mcopy_cam_canon/McopySerial.cpp
@@ -13,12 +13,20 @@ void McopySerial::begin () {
 char McopySerial::loop () {
 	if (Serial.available()) {
 		cmdChar = (char) Serial.read();
+		internal();
 	} else {
 		cmdChar = 'z';
 	}
 	return cmdChar;
 }
 
+void McopySerial::internal () {
+	if (cmdChar == DEBUG) {
+		debugOn = !debugOn;
+		cmdChar = 'z';
+	}
+}
+
 void McopySerial::setBaud (int baudRate) {
 	baud = baudRate;
 }
diff --git a/ino/mcopy_cam_canon/McopySerial.h b/ino/mcopy_cam_canon/McopySerial.h
index 1b29d1b..505430f 100644
--- a/ino/mcopy_cam_canon/McopySerial.h
+++ b/ino/mcopy_cam_canon/McopySerial.h
@@ -10,6 +10,8 @@ class McopySerial {
 	volatile bool debugOn = false;
 	volatile char cmdChar = 'z';
 
+	void internal ();
+
 	public:
 
 	/* CMD FLAGS */