diff --git a/Software/Sender/Sender.ino b/Software/Sender/Sender.ino
index fee24fd..261fe53 100644
--- a/Software/Sender/Sender.ino
+++ b/Software/Sender/Sender.ino
@@ -18,11 +18,12 @@
 #define Max485_DI 8 // data input of Max485
 
 #define TRESHOLD 1024
-#define ID 0
+#define ID 4
 // 0=Test
 // 1=Arbeitszimmer
 // 2=Küche
 // 3=Bad
+// 4=Treppenhaus
 
 #define DEBUG
 #define LOG_TO_SERIAL