diff --git a/Demo_C/Demo/LED/LED.c b/Demo_C/Demo/LED/LED.c
index e635da8..a244f0b 100644
--- a/Demo_C/Demo/LED/LED.c
+++ b/Demo_C/Demo/LED/LED.c
@@ -15,7 +15,7 @@
 #define END_LAMP_IDX    2
 #define COLOR_AMOUNT    3
 enum color_pin {RED, GREEN, BLUE};
-enum color_spectrum {pr, pg, mr, pb, mg};
+enum color_spectrum {pr, mb, pg, mr, pb, mg};
 
 static unsigned long cur_time;
 static unsigned long prev_time;
@@ -80,6 +80,9 @@ void spectrum()
 		case pr:
 			if(++red_state>LIGHT_MAX) {++spectrum_state;}
 			break;
+		case mb:
+			if(--blue_state<LIGHT_MIN) {++spectrum_state;}
+			break;
 		case pg:
 			if(++green_state>LIGHT_MAX) {++spectrum_state;}
 			break;
@@ -91,6 +94,8 @@ void spectrum()
 			break;
 		case mg:
 			if(--green_state>LIGHT_MIN) {spectrum_state = 0;}
+		default:
+			spectrum_state = 0;
 	}
 }