diff --git a/Arduino/McLighting/definitions.h b/Arduino/McLighting/definitions.h
index 80445f1..f9c1a54 100644
--- a/Arduino/McLighting/definitions.h
+++ b/Arduino/McLighting/definitions.h
@@ -1,7 +1,7 @@
 // Neopixel
-#define PIN 5           // PIN (14 / D5) where neopixel / WS2811 strip is attached
+#define PIN 5           // PIN (5 / D1) where neopixel / WS2811 strip is attached
 #define NUMLEDS 24      // Number of leds in the strip
-#define BUILTIN_LED 2    // ESP-12F has the built in LED on GPIO2, see https://github.com/esp8266/Arduino/issues/2192
+// #define BUILTIN_LED 2    // ESP-12F has the built in LED on GPIO2, see https://github.com/esp8266/Arduino/issues/2192
 #define BUTTON 4         // Input pin (4 / D2) for switching the LED strip on / off, connect this PIN to ground to trigger button.
 
 const char HOSTNAME[] = "McLighting01";   // Friedly hostname
@@ -40,7 +40,7 @@ uint32_t autoParams[][4] = {   // color, speed, mode, duration (seconds)
     String effectString = "Static";
   #endif
 
-  const char mqtt_clientid[] = "NeoPixelsStrip"; // MQTT ClientID
+  const char * mqtt_clientid = HOSTNAME;           // Set ClientID to HOSTNAME to be unique
 
   char mqtt_host[64] = "";
   char mqtt_port[6] = "";