Fix barometric pressue.

Creating two classes (one for PRESSURE and one for ALTITUDE)
was in fact changing the sensor permanently into ALTITUDE.
For every reading it is now initialized in the correct mode.

Author: brocaar

pysense-example/main.py

@@ -12,8 +12,6 @@
 from MPL3115A2 import MPL3115A2, ALTITUDE, PRESSURE
 
 py = Pysense()
-mpPress = MPL3115A2(py,mode=PRESSURE)
-mpAlt = MPL3115A2(py,mode=ALTITUDE)
 si = SI7006A20(py)
 lt = LTR329ALS01(py)
 li = LIS2HH12(py)
@@ -76,11 +74,14 @@
     lpp.add_relative_humidity(1, si.humidity())
     lpp.add_temperature(1, si.temperature())
 
+    mpPress = MPL3115A2(py,mode=PRESSURE)
     print('\n\n** Barometric Pressure Sensor with Altimeter (MPL3115A2)')
     print('Pressure (hPa)', mpPress.pressure()/100)
+    lpp.add_barometric_pressure(1, mpPress.pressure()/100)
+
+    mpAlt = MPL3115A2(py,mode=ALTITUDE)
     print('Altitude', mpAlt.altitude())
     print('Temperature', mpAlt.temperature())
-    lpp.add_barometric_pressure(1, mpPress.pressure()/100)
     lpp.add_gps(1, 0, 0, mpAlt.altitude())
     lpp.add_temperature(2, mpAlt.temperature())