preparing code for Device 4

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

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