diff --git a/Arduino/LEDstream_FastLED/LEDstream_FastLED.ino b/Arduino/LEDstream_FastLED/LEDstream_FastLED.ino
index 8a3b850..aec1dad 100644
--- a/Arduino/LEDstream_FastLED/LEDstream_FastLED.ino
+++ b/Arduino/LEDstream_FastLED/LEDstream_FastLED.ino
@@ -4,7 +4,7 @@
  * library (http://fastled.io) for driving led strips.
  * 
  * http://github.com/dmadison/Adalight-FastLED
- * Last Updated: 2017-04-08
+ * Last Updated: 2017-04-23
  */
 
 // --- General Settings
@@ -27,6 +27,8 @@ static const unsigned long
 //#define CLEAR_ON_START     // LEDs are cleared on reset
 //#define GROUND_PIN 10      // additional grounding pin (optional)
 //#define CALIBRATE          // sets all LEDs to the color of the first
+//#define DEBUG_LED 13       // turns on the Arduino's built-in LED
+                             //   if the magic word + checksum match
 
 // --------------------------------------------------------------------
 
@@ -67,6 +69,11 @@ void setup(){
 		digitalWrite(GROUND_PIN, LOW);
 	#endif
 
+	#ifdef DEBUG_LED
+		pinMode(DEBUG_LED, OUTPUT);
+		digitalWrite(DEBUG_LED, LOW);
+	#endif
+
 	FastLED.addLeds<LED_TYPE, Led_Pin, COLOR_ORDER>(leds, Num_Leds);
 	FastLED.setBrightness(Brightness);
 
@@ -80,20 +87,22 @@ void setup(){
 }
 
 void adalight(){ 
-	uint8_t
-		mode = MODE_HEADER,
+	static uint8_t
+		mode = MODE_HEADER;
+	static uint8_t
 		headPos,
 		hi, lo, chk;
 	int16_t
 		c;
-	uint16_t
+	static uint16_t
 		outPos;
-	uint32_t
+	static uint32_t
 		bytesRemaining;
 	unsigned long
-		lastByteTime,
-		lastAckTime,
 		t;
+	static unsigned long
+		lastByteTime,
+		lastAckTime;
 
 	Serial.print("Ada\n"); // Send ACK string to host
 
@@ -134,6 +143,10 @@ void adalight(){
 							if(chk == (hi ^ lo ^ 0x55)) {
 								// Checksum looks valid. Get 16-bit LED count, add 1
 								// (# LEDs is always > 0) and multiply by 3 for R,G,B.
+								#ifdef DEBUG_LED
+									digitalWrite(DEBUG_LED, HIGH);
+								#endif
+
 								bytesRemaining = 3L * (256L * (long)hi + (long)lo + 1L);
 								outPos = 0;
 								memset(leds, 0, Num_Leds * sizeof(struct CRGB));
@@ -166,6 +179,10 @@ void adalight(){
 					// End of data -- issue latch:
 					mode = MODE_HEADER; // Begin next header search
 					FastLED.show();
+
+					#ifdef DEBUG_LED
+						digitalWrite(DEBUG_LED, LOW);
+					#endif
 				}
 				break;
 			} // end switch