diff --git a/src/Code_LEDLock.cpp b/src/Code_LEDLock.cpp
index f4d38b4..8d76187 100644
--- a/src/Code_LEDLock.cpp
+++ b/src/Code_LEDLock.cpp
@@ -2,7 +2,7 @@
 
 /* USB_LED_bit are codes from http://www.usb.org/developers/hidpage/HID1_11.pdf keyboard output report
 */
-Code_LEDLock::Code_LEDLock(const uint16_t scancode, LED& refLED)
+Code_LEDLock::Code_LEDLock(const uint16_t scancode, LEDInterface& refLED)
     : scancode(scancode), refLED(refLED)
 {
     switch (scancode)                           //initilize USB_LED_bit for given scancode
diff --git a/src/Code_LEDLock.h b/src/Code_LEDLock.h
index 1f25606..d1462b5 100644
--- a/src/Code_LEDLock.h
+++ b/src/Code_LEDLock.h
@@ -3,7 +3,7 @@
 #include <Arduino.h>
 #include <inttypes.h>
 #include <Code.h>
-#include <LED.h>
+#include <LEDInterface.h>
 
 extern volatile uint8_t keyboard_leds;
 
@@ -21,11 +21,11 @@ class Code_LEDLock : public Code
     private:
         const uint16_t scancode;
         uint8_t USB_LED_bit;                    //codes used by keyboard output report
-        LED& refLED;                            //indicator on keyboard
+        LEDInterface& refLED;                   //indicator on keyboard
         void updateLED() const;
 
     public:
-        Code_LEDLock(const uint16_t scancode, LED& refLED);
+        Code_LEDLock(const uint16_t scancode, LEDInterface& refLED);
         virtual void press();
         virtual void release();
 };
diff --git a/src/Debug.cpp b/src/Debug.cpp
index 85ffd68..7db0ccb 100644
--- a/src/Debug.cpp
+++ b/src/Debug.cpp
@@ -31,7 +31,7 @@ void Debug::printScansPerSecond()
 
 //Sometimes OS takes 6 seconds to recongnize keyboard.
 //wait_for_OS() will blink LED and count up once per second for specified number of seconds.
-void Debug::wait_for_OS(LED& led, const uint8_t seconds)
+void Debug::wait_for_OS(LEDInterface& led, const uint8_t seconds)
 {
     for (uint8_t elapsed = 0; elapsed < seconds; elapsed++)
     {
diff --git a/src/Debug.h b/src/Debug.h
index 75e5a11..07dcf2b 100644
--- a/src/Debug.h
+++ b/src/Debug.h
@@ -1,13 +1,13 @@
 #ifndef DEBUG_H
 #define DEBUG_H
 #include <Arduino.h>
-#include <LED.h>
+#include <LEDInterface.h>
 
 class Debug
 {
     public:
         void printMicrosecondsPerScan();        //print microseconds per scan every second
         void printScansPerSecond();             //print scans per second every second
-        void wait_for_OS(LED& led, uint8_t seconds); //wait for OS to recongnize keyboard
+        void wait_for_OS(LEDInterface& led, uint8_t seconds); //wait for OS to recongnize keyboard
 };
 #endif
diff --git a/src/LED.h b/src/LED.h
deleted file mode 100644
index 1816aed..0000000
--- a/src/LED.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef LED_H
-#define LED_H
-
-/* LED is an interface class
-Each LED object is an IC pin that is used to power an LED on and off.
-*/
-class LED
-{
-    public:
-        virtual void on()=0;
-        virtual void off()=0;
-};
-#endif
diff --git a/src/LEDInterface.h b/src/LEDInterface.h
new file mode 100644
index 0000000..9ff46c7
--- /dev/null
+++ b/src/LEDInterface.h
@@ -0,0 +1,12 @@
+#ifndef LEDINTERFACE_H
+#define LEDINTERFACE_H
+
+/* Each LED object is an IC pin that is used to power an LED on and off.
+*/
+class LEDInterface
+{
+    public:
+        virtual void on()=0;
+        virtual void off()=0;
+};
+#endif
diff --git a/src/LED_IOE.h b/src/LED_IOE.h
index ac125a4..53b619f 100644
--- a/src/LED_IOE.h
+++ b/src/LED_IOE.h
@@ -3,13 +3,13 @@
 #include <Arduino.h>
 #include <inttypes.h>
 #include <Wire.h>
-#include <LED.h>
+#include <LEDInterface.h>
 #include <PortInterface.h>
 
 /* A LED_IOE object is an I/O expander pin that is connected to an LED indicator light.
 Input/Ouput Direction configuration are set to ouput in PortWrite_*.begin() and PortRead_*.begin(). todo PortRead_*??
 */
-class LED_IOE : public LED
+class LED_IOE : public LEDInterface
 {
     private:
         PortInterface& refPort;
diff --git a/src/LED_uC.h b/src/LED_uC.h
index 79863cd..3b89ae4 100644
--- a/src/LED_uC.h
+++ b/src/LED_uC.h
@@ -2,11 +2,11 @@
 #define LED_UC_H
 #include <Arduino.h>
 #include <inttypes.h>
-#include <LED.h>
+#include <LEDInterface.h>
 
 /* A LED_uC turns LED on and off.
 */
-class LED_uC: public LED
+class LED_uC: public LEDInterface
 {
     private:
         const uint8_t pin;                      //Aduino pin that is connected to an LED
diff --git a/src/LayerState_LED.h b/src/LayerState_LED.h
index 2a61236..d9ba0be 100644
--- a/src/LayerState_LED.h
+++ b/src/LayerState_LED.h
@@ -4,7 +4,7 @@
 #include <Arduino.h>
 #include <inttypes.h>
 #include <LayerState.h>
-#include <LED.h>
+#include <LEDInterface.h>
 
 /* Basic LayerState with layer LED indictor lights.
 begin() should be called once to turn on LED for initial active layer.
@@ -12,10 +12,10 @@ begin() should be called once to turn on LED for initial active layer.
 class LayerState_LED : public LayerState
 {
     private:
-        LED*const *const ptrsLEDs;              //array of LEDs, where layerId is array index
+        LEDInterface*const *const ptrsLEDs;    //array of LEDs, where layerId is array index
         virtual void setActiveLayer(const uint8_t layerId);//set active layerId and turn on it's LED
     public:
-        LayerState_LED(LED*const ptrsLEDs[]): ptrsLEDs(ptrsLEDs) {}
+        LayerState_LED(LEDInterface*const ptrsLEDs[]): ptrsLEDs(ptrsLEDs) {}
         void begin();
 };
 #endif
diff --git a/tutorials/keybrd_5a_LED_on_uC/keybrd_5a_LED_on_uC.ino b/tutorials/keybrd_5a_LED_on_uC/keybrd_5a_LED_on_uC.ino
index 4f4c3f7..7c3ab41 100644
--- a/tutorials/keybrd_5a_LED_on_uC/keybrd_5a_LED_on_uC.ino
+++ b/tutorials/keybrd_5a_LED_on_uC/keybrd_5a_LED_on_uC.ino
@@ -50,7 +50,7 @@ The active layerId is used as an index to dereference the prtsLayerLEDs[] array.
 */
 enum layers { NORMAL, FN };
 
-LED* prtsLayerLEDs[] = { &LED_normal, &LED_fn }; //array index matches enum layerIds
+LEDInterface* prtsLayerLEDs[] = { &LED_normal, &LED_fn }; //array index matches enum layerIds
 LayerState_LED layerState(prtsLayerLEDs);
 
 Code_LayerHold l_fn(FN, layerState);
diff --git a/tutorials/keybrd_5b_LED_on_IOE/keybrd_5b_LED_on_IOE.ino b/tutorials/keybrd_5b_LED_on_IOE/keybrd_5b_LED_on_IOE.ino
index 210657e..f10fb76 100644
--- a/tutorials/keybrd_5b_LED_on_IOE/keybrd_5b_LED_on_IOE.ino
+++ b/tutorials/keybrd_5b_LED_on_IOE/keybrd_5b_LED_on_IOE.ino
@@ -28,7 +28,7 @@ This layout table shows left and right matrices:
 #include <LED_uC.h>
 
 //right matrix
-#include <PortMCP23S17.h>
+#include <Port_MCP23S17.h>
 #include <Scanner_IOE.h>
 #include <LED_IOE.h>
 
@@ -47,8 +47,8 @@ LED_uC LED_CapsLck(21);
 
 // --------------- RIGHT SCANNER ---------------
 const uint8_t IOE_ADDR = 0x20;                  //MCP23S17 address, all 3 ADDR pins are grounded
-PortMCP23S17 portA(IOE_ADDR, 0, 1<<0 | 1<<1 );  //for read and LED
-PortMCP23S17 portB(IOE_ADDR, 1, 0);             //for strobe and LED
+Port_MCP23S17 portA(IOE_ADDR, 0, 1<<0 | 1<<1 );  //for read and LED
+Port_MCP23S17 portB(IOE_ADDR, 1, 0);             //for strobe and LED
 
 Scanner_IOE scanner_R(LOW, portB, portA);
 
@@ -60,7 +60,7 @@ LED_IOE LED_fn(portB, 1<<4);
 // ---------------- LAYER CODE -----------------
 enum layers { NORMAL, FN };
 
-LED* prtsLayerLEDs[] = { &LED_normal, &LED_fn }; //array index matches enum layerIds
+LEDInterface* prtsLayerLEDs[] = { &LED_normal, &LED_fn }; //array index matches enum layerIds
 LayerState_LED layerState(prtsLayerLEDs);
 
 Code_LayerHold l_fn(FN, layerState);