diff --git a/arduino/mqttfastledmenu/mqttfastledmenu.cpp b/arduino/mqttfastledmenu/mqttfastledmenu.cpp
index d8eceec..a8d2fdb 100644
--- a/arduino/mqttfastledmenu/mqttfastledmenu.cpp
+++ b/arduino/mqttfastledmenu/mqttfastledmenu.cpp
@@ -194,7 +194,9 @@ void ledError()
 void ledFullColor()
 {
     fill_solid(leds, LED_NUM, color);
-    FastLED.delay(1000 / speed);
+    int breath = (exp(sin(millis() / 2000.0 * PI)) - 0.36787944) * 108.4;
+    FastLED.setBrightness(breath);
+    FastLED.delay(100 / speed);
 }
 
 void loop() {