[werk_ag]

If the rain gauge is working, connect it to pins 3 an 4, and then enable the debug mode on the TX software.
Reprogram the Nano and open the serial monitor on your IDE. If there isn't any problem you should see something on the screen at each 31 seconds.

Code:

// --------------------------------------------------------------------------------------
//   Debug
// --------------------------------------------------------------------------------------
#define Debug_Enable      true
#define DebugID0          false
#define DebugID2          false
#define DebugID3          true
#define DebugID4          false
#define DebugID5          false
#define Easyweather_Test  false
#define Debug_SLinterface false