diff --git a/Project/applications/smartcities/adc.h b/Project/applications/smartcities/adc.h
index 85a8a47..97c7d07 100644
--- a/Project/applications/smartcities/adc.h
+++ b/Project/applications/smartcities/adc.h
@@ -12,7 +12,7 @@
 #define ADCbatt_MIN_VALUE		(0)
 #define ADCbatt_MAX_VALUE		(0xfff) /* 12-bit adc */
 #define ADCbatt_VREF_PLUS		(3300) 	/*  Vref+ is connected with Vdda (3.3v) */
-#define ADCbatt_VREF_MINUS		(0) 	/*  Vref- is connected with Vssa (0v) */
+#define ADCbatt_VREF_MINUS		(2300) 	/*  Vref- is connected with Vssa (2.1v) */
 
 #define ADCsound_MIN_VALUE		(0)
 #define ADCsound_MAX_VALUE		(0xfff) /* 12-bit adc */
diff --git a/Project/applications/smartcities/include/sensors.h b/Project/applications/smartcities/include/sensors.h
index c27050f..50a1adf 100644
--- a/Project/applications/smartcities/include/sensors.h
+++ b/Project/applications/smartcities/include/sensors.h
@@ -12,9 +12,11 @@
 #define		DISTANCE_ADDR		0x01
 #define		PRESSURE_ADDR		0x77 //Cambiar a MPL115A
 #define		HUMIDITY_TEMP_ADDR	0x27
-#define		SOUND_ADDR			0x27
+#define		SOUND_ADDR			0x72
 //REMEMBER TO UPDATE I2C_scan ROUTINE WITH EACH NEW SENSOR!!!!
-#define		TOTAL_SENSORS		4
+#define		TOTAL_SENSORS		5
+
+#define		BATTERY_ADDR		0x00 //SIEMPRE PRESENTE, NUNCA BUSCAR EN i2c_scan
 
 typedef struct {
   uint8_t ID;
@@ -81,4 +83,10 @@ void init_sound(void);
 uint32_t get_sound_data(void);
 char* sound_value(uint32_t sound);
 
+//BATTERY SENSOR
+
+void init_battery(void);
+uint32_t get_battery_data(void);
+char* battery_value(uint32_t sound);
+
 #endif
diff --git a/Project/applications/smartcities/sensors.c b/Project/applications/smartcities/sensors.c
index 40f04f6..ece4d1a 100644
--- a/Project/applications/smartcities/sensors.c
+++ b/Project/applications/smartcities/sensors.c
@@ -4,6 +4,8 @@ sensor light_sensor 		= {LIGHT_ADDR, "Light sensor", "illumination", "lux",NULL}
 sensor ultrasound_sensor 	= {DISTANCE_ADDR, "Ultrasound sensor", "distance", "cm",NULL};
 sensor pressure_sensor 		= {PRESSURE_ADDR, "Pressure sensor", "pressure", "kPa",NULL};
 sensor humidity_temp_sensor = {HUMIDITY_TEMP_ADDR, "Humidity and Temperature","ºC,RH",NULL};
+sensor sound_sensor 		= {SOUND_ADDR, "Sound sensor","mV",NULL};
+sensor battery 				= {BATTERY_ADDR, "Battery Level","mV",NULL};
 
 uint32_t get_light_data(void)
 {
@@ -297,8 +299,25 @@ uint32_t get_sound_data(void)
 }
 char* sound_value(uint32_t sound)
 {
-	char *value = chHeapAlloc(NULL,21 + 1);
-	sprintf(value,"%d",(unsigned int)sound);
+	char *value = chHeapAlloc(NULL,11 + 1);
+	sprintf(value,"%4u",(unsigned int)sound);
+	return value;
+}
+
+void init_battery(void)
+{
+	adc_batt_init();
+}
+
+uint32_t get_battery_data(void)
+{
+	return adc_batt_process();
+}
+
+char* battery_value(uint32_t sound)
+{
+	char *value = chHeapAlloc(NULL,11 + 1);
+	sprintf(value,"%4u",(unsigned int)sound);
 	return value;
 }