diff --git a/circuitpython/code/main.py b/circuitpython/code/main.py
index 3e96a2f..ebfd593 100644
--- a/circuitpython/code/main.py
+++ b/circuitpython/code/main.py
@@ -22,12 +22,13 @@ Use with:
  * Adafruit Ultimate GPS FeatherWing
  * Bosch BME280 sensor (air temperature, humidity, atmospheric pressure) on I2C
 
+https://framagit.org/arofarn/Cameteo
+
 TODO for v1 :
  * write data on flash drive (work-in-progress)
  * send data through UART (one more !)
 """
 __version__ = 0.1
-__repo__ = "https://framagit.org/arofarn/Cameteo"
 
 ##########
 # config #
@@ -61,42 +62,47 @@ import neopixel
 class Data:
     """Class for handling data"""
     def __init__(self):
-        self.data = {'SYS': {},
-                     'BME280': {},
-                     'GPS': {}
+        self.data = {'SYS': {'time': {'val': "2000/01/01_00:00:00", 'unit': '' },
+                             'vbat': {'val': int(), 'unit': 'V' },
+                             'CPUtemp': {'val': float(), 'unit': '°C' }},
+                     'BME280': {'temp': { 'val': float(), 'unit': '°C' },
+                                'hum': { 'val': int(), 'unit': '%' },
+                                'press': { 'val': float(), 'unit': 'hPa' }},
+                     'GPS': {'timestamp': {'val': "2000/01/01_00:00:00", 'unit': ''},
+                             'lat': {'val': float(), 'unit': 'deg'},
+                             'lon': {'val': float(), 'unit': 'deg'},
+                             'alt': {'val': float(), 'unit': 'm'},
+                             'qual': {'val': int(), 'unit': ''}}
                      }
 
     def update(self):
         """Read the data from various sensors and update the data dict variable"""
         #Data from Feather board
-        self.data['SYS'] = {'time': {'val': datetime_format.format(*clock.datetime[0:6]),
-                                     'unit': '' },
-                            'v_bat': {'val': measure_vbat(),
-                                      'unit': 'V' },
-                            'CPU_temp': {'val': microcontroller.cpu.temperature,
-                                         'unit': '°C' }}
+        self.data['SYS']['time']['val'] = datetime_format.format(*clock.datetime[0:6])
+        self.data['SYS']['vbat']['val'] = round(measure_vbat(), 3)
+        self.data['SYS']['CPUtemp']['val'] = round(microcontroller.cpu.temperature, 2)
 
         #Data from BME280
-        self.data['BME280'] = {'temp': { 'val': round(bme280.temperature, 1), 'unit': '°C' },
-                               'hum': { 'val': int(bme280.humidity), 'unit': '%' },
-                               'press': { 'val': round(bme280.pressure, 2), 'unit': 'hPa' }}
+        self.data['BME280']['temp']['val'] = round(bme280.temperature, 1)
+        self.data['BME280']['hum']['val'] = int(bme280.humidity)
+        self.data['BME280']['press']['val'] = round(bme280.pressure, 2)
+
         if gps_enable:
             if gps.has_fix:
-                self.data['GPS'] = {'timestamp': {'val': datetime_format.format(gps.timestamp_utc.tm_year,
-                                                                                gps.timestamp_utc.tm_mon,
+                self.data['GPS']['timestamp']['val'] = datetime_format.format(gps.timestamp_utc.tm_year,
+                                                                              gps.timestamp_utc.tm_mon,
                                                                                 gps.timestamp_utc.tm_mday,
                                                                                 gps.timestamp_utc.tm_hour,
                                                                                 gps.timestamp_utc.tm_min,
-                                                                                gps.timestamp_utc.tm_sec),
-                                                  'unit': ''},
-                                    'lat': {'val': gps.latitude, 'unit': 'deg'},
-                                    'lon': {'val': gps.longitude, 'unit': 'deg'},
-                                    'alt': {'val': gps.altitude_m, 'unit': 'm'},
-                                    'qual': {'val': gps.fix_quality, 'unit': ''}}
+                                                                                gps.timestamp_utc.tm_sec)
+                self.data['GPS']['lat']['val'] = gps.latitude
+                self.data['GPS']['lon']['val'] = gps.longitude
+                self.data['GPS']['alt']['val'] = gps.altitude_m
+                self.data['GPS']['qual']['val'] = gps.fix_quality
             else:
-                self.data['GPS'] = {'lat': {'val': None, 'unit': 'deg'},
-                                    'lon': {'val': None, 'unit': 'deg'},
-                                    'alt': {'val': None, 'unit': 'm'}}
+                self.data['GPS']['lat']['val'] = None
+                self.data['GPS']['lon']['val'] = None
+                self.data['GPS']['alt']['val'] = None
         else:
             self.data['GPS'] = None
 
@@ -274,6 +280,7 @@ while True:
             data.write_on_flash()
         if data_to_neopixel:
             pixel[0] = update_neopixel(data.data)
+
         gc.collect()
         # micropython.mem_info(1)
         # print('Memory free: {} allocated: {}'.format(gc.mem_free(), gc.mem_alloc()))