diff --git a/ArduPlane/sensors.pde b/ArduPlane/sensors.pde
index 15bd98228e..1d7ca777c4 100644
--- a/ArduPlane/sensors.pde
+++ b/ArduPlane/sensors.pde
@@ -15,7 +15,7 @@ static LowPassFilterInt32 altitude_filter(0.3);
 // above the calibration altitude
 static int32_t read_barometer(void)
 {
-	barometer.read();
+    barometer.read();
     return altitude_filter.apply(barometer.get_altitude() * 100.0);
 }
 
@@ -23,7 +23,7 @@ static int32_t read_barometer(void)
 static void read_airspeed(void)
 {
     airspeed.read();
-	calc_airspeed_errors();
+    calc_airspeed_errors();
 }
 
 static void zero_airspeed(void)
@@ -34,24 +34,24 @@ static void zero_airspeed(void)
 
 static void read_battery(void)
 {
-	if(g.battery_monitoring == 0) {
-		battery_voltage1 = 0;
-		return;
-	}
-	
-	if(g.battery_monitoring == 3 || g.battery_monitoring == 4) {
-        static AP_AnalogSource_Arduino bat_pin(BATTERY_PIN_1);
-		battery_voltage1 = BATTERY_VOLTAGE(bat_pin.read_average());
+    if(g.battery_monitoring == 0) {
+        battery_voltage1 = 0;
+        return;
     }
-	if(g.battery_monitoring == 4) {
+
+    if(g.battery_monitoring == 3 || g.battery_monitoring == 4) {
+        static AP_AnalogSource_Arduino bat_pin(BATTERY_PIN_1);
+        battery_voltage1 = BATTERY_VOLTAGE(bat_pin.read_average());
+    }
+    if(g.battery_monitoring == 4) {
         static AP_AnalogSource_Arduino current_pin(CURRENT_PIN_1);
-		current_amps1	 = CURRENT_AMPS(current_pin.read_average());
-		current_total1	 += current_amps1 * (float)delta_ms_medium_loop * 0.0002778;				// .0002778 is 1/3600 (conversion to hours)
-	}
-	
-	#if BATTERY_EVENT == ENABLED
-		if(battery_voltage1 < LOW_VOLTAGE)	low_battery_event();
-		if(g.battery_monitoring == 4 && current_total1 > g.pack_capacity)	low_battery_event();
-	#endif
+        current_amps1    = CURRENT_AMPS(current_pin.read_average());
+        current_total1   += current_amps1 * (float)delta_ms_medium_loop * 0.0002778;                                    // .0002778 is 1/3600 (conversion to hours)
+    }
+
+#if BATTERY_EVENT == ENABLED
+    if(battery_voltage1 < LOW_VOLTAGE) low_battery_event();
+    if(g.battery_monitoring == 4 && current_total1 > g.pack_capacity) low_battery_event();
+#endif
 }