diff --git a/sonoff/sonoff.h b/sonoff/sonoff.h
index a2eecea4f..47fec4645 100644
--- a/sonoff/sonoff.h
+++ b/sonoff/sonoff.h
@@ -131,6 +131,18 @@ typedef unsigned long power_t;              // Power (Relay) type
 #define DAWN_NAUTIC            -12.0
 #define DAWN_ASTRONOMIC        -18.0
 
+// Sensor definition for KNX Driver
+#define KNX_TEMPERATURE 17
+#define KNX_HUMIDITY 18
+#define KNX_ENERGY_VOLTAGE 19
+#define KNX_ENERGY_CURRENT 20
+#define KNX_ENERGY_POWER 21
+#define KNX_ENERGY_POWERFACTOR 22
+#define KNX_ENERGY_DAILY 23
+#define KNX_ENERGY_START 24
+#define KNX_ENERGY_TOTAL 25
+#define KNX_MAX_device_param 25
+
 /*********************************************************************************************\
  * Enumeration
 \*********************************************************************************************/
@@ -180,4 +192,4 @@ const uint8_t kDefaultRfCode[9] PROGMEM = { 0x21, 0x16, 0x01, 0x0E, 0x03, 0x48,
 
 extern uint8_t light_device;  // Light device number
 
-#endif  // _SONOFF_H_
\ No newline at end of file
+#endif  // _SONOFF_H_