Hotfix: Make voltage scaling for standalone default

ROMFS/px4fmu_common/init.d/08_ardrone

@@ -30,6 +30,7 @@ fi
 # MAV_TYPE     2 = quadrotor
 #
 param set MAV_TYPE 2
+param set BAT_V_SCALING 0.008381
 
 #
 # Start MAVLink

ROMFS/px4fmu_common/init.d/09_ardrone_flow

@@ -30,6 +30,7 @@ fi
 # MAV_TYPE     2 = quadrotor
 #
 param set MAV_TYPE 2
+param set BAT_V_SCALING 0.008381
 
 #
 # Start MAVLink and MAVLink Onboard (PX4FLOW Sensor)

src/modules/sensors/sensor_params.c

@@ -174,7 +174,8 @@ PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.0082f);
 /* default is conversion factor for the PX4IO / PX4IOAR board, the factor for PX4FMU standalone is different */
 /* PX4IOAR: 0.00838095238 */
 /* FMU standalone: 1/(10 / (47+10)) * (3.3 / 4095) = 0.00459340659 */
-PARAM_DEFINE_FLOAT(BAT_V_SCALING, (3.3f * 52.0f / 5.0f / 4095.0f));
+/* FMU with PX4IOAR: (3.3f * 52.0f / 5.0f / 4095.0f) */
+PARAM_DEFINE_FLOAT(BAT_V_SCALING, 0.00459340659f);
 #endif
 
 PARAM_DEFINE_INT32(RC_MAP_ROLL, 1);