   //theSender.setProtocol(1);  // -> setPulseLength(350); '0' = 1,3
 #endif // SEND_DATA
 
-#ifdef SCAN_SENSORS
+#if (defined SCAN_SENSORS) && (defined DEBUG)
   // locate devices on the bus
   Serial.print(F("Locating devices..."));
   Serial.print(F("Found "));


#ifdef USE_LDR
 // define a pin for Photo resistor (ADC input!)
 #define LDR_PIN     0
#endif // USE_LDR

// Data wire is plugged into port 2 on the Arduino

      sensors.setResolution(addr, TEMPERATURE_PRECISION);
    }
  }
#endif // SCAN_SENSORS && DEBUG

#ifdef USE_LDR
  //           PhotoR     10K
