diff --git a/Arduino/McLighting/McLighting.ino b/Arduino/McLighting/McLighting.ino
index 03df3d6..ee06621 100644
--- a/Arduino/McLighting/McLighting.ino
+++ b/Arduino/McLighting/McLighting.ino
@@ -427,6 +427,10 @@ void setup() {
   }
 #endif
 
+#if defined(POWER_SUPPLY)
+  pinMode(POWER_SUPPLY, OUTPUT); // output to control external power supply 
+#endif
+
   // start ticker with 0.5 because we start in AP mode and try to connect
   ticker.attach(0.5, tick);
 
@@ -776,8 +780,17 @@ void loop() {
     #if defined(ENABLE_MQTT)
       if (prevmode != mode) { snprintf(mqtt_buf, sizeof(mqtt_buf), "OK =off", ""); }
     #endif
+    #if defined(POWER_SUPPLY)
+      if (prevmode != mode) {digitalWrite(POWER_SUPPLY, LOW); } // power off -> external power supply
+    #endif
   }
   
+#if defined(POWER_SUPPLY)
+  if (mode != OFF) {
+    if (prevmode != mode) {digitalWrite(POWER_SUPPLY, HIGH); } // power on -> external power supply
+  }
+#endif
+
   if (mode == AUTO) {
     if (prevmode != mode) {
       handleAutoStart();
diff --git a/Arduino/McLighting/definitions.h b/Arduino/McLighting/definitions.h
index 91cb4ed..f47c0a8 100644
--- a/Arduino/McLighting/definitions.h
+++ b/Arduino/McLighting/definitions.h
@@ -12,6 +12,7 @@
 #define FX_OPTIONS 48      // ws2812fx Options 48 = SIZE_SMALL + FADE_MEDIUM  is configurable just for the start; for WS2812FX setSegment OPTIONS, see: https://github.com/kitesurfer1404/WS2812FX/blob/master/extras/WS2812FX%20Users%20Guide.md
 //#define LED_TYPE_WS2811    // Uncomment, if LED type uses 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
 #define LED_BUILTIN 2      // ESP-12F has the built in LED on GPIO2, see https://github.com/esp8266/Arduino/issues/2192
+#define POWER_SUPPLY 12    // PIN (12 / D6) If defined, enable output to control external power supply 
 
 char HOSTNAME[65] = "McLightingRGBW"; // Friedly hostname  is configurable just for the start. Hostname should not contain spaces as this can break Home Assistant discovery if used.
 
diff --git a/Arduino/McLighting/version.h b/Arduino/McLighting/version.h
index c1cb01b..c3b43d1 100644
--- a/Arduino/McLighting/version.h
+++ b/Arduino/McLighting/version.h
@@ -1 +1 @@
-#define SKETCH_VERSION "2.2.6.RU1.rgbw.3c"
+#define SKETCH_VERSION "2.2.7.RU1.rgbw.3c"
diff --git a/Arduino/McLighting/version_info.ino b/Arduino/McLighting/version_info.ino
index a74007e..fbbb069 100644
--- a/Arduino/McLighting/version_info.ino
+++ b/Arduino/McLighting/version_info.ino
@@ -165,4 +165,7 @@
  * adressed issue: #31
  * adressed issue: #32 
  * 
+ * 09 Oktober 2019
+ * Version Bump to 2.2.7 rgbw 3colors 
+ * added output to control external power supply
  */