Added sensor properties + example to reflect consistency changes

adafruit_sgp30.py

@@ -75,6 +75,31 @@ def __init__(self, i2c, address=_SGP30_DEFAULT_I2C_ADDR):
             raise RuntimeError('SGP30 Not detected')
         self.iaq_init()
 
+
+    @property
+    def tvoc(self):
+        """Total Volatile Organic Compound in parts per billion."""
+        return self.iaq_measure()[1]
+
+
+    @property
+    def baseline_tvoc(self):
+        """Total Volatile Organic Compound baseline value"""
+        return self.get_iaq_baseline()[1]
+
+
+    @property
+    def co2eq(self):
+        """Carbon Dioxide Equivalent in parts per million"""
+        return self.iaq_measure()[0]
+
+
+    @property
+    def baseline_co2eq(self):
+        """Carbon Dioxide Equivalent baseline value"""
+        return self.get_iaq_baseline()[0]
+
+
     def iaq_init(self):
         """Initialize the IAQ algorithm"""
         # name, command, signals, delay

examples/sgp30_simpletest.py

@@ -19,10 +19,11 @@
 
 while True:
     co2eq, tvoc = sgp30.iaq_measure()
-    print("CO2eq = %d ppm \t TVOC = %d ppb" % (co2eq, tvoc))
+    print("co2eq = %d ppm \t tvoc = %d ppb" % (sgp30.co2eq, sgp30.tvoc))
     time.sleep(1)
     elapsed_sec += 1
     if elapsed_sec > 10:
         elapsed_sec = 0
         co2eq_base, tvoc_base = sgp30.get_iaq_baseline()
-        print("**** Baseline values: CO2eq = 0x%x, TVOC = 0x%x" % (co2eq_base, tvoc_base))
+        print("**** Baseline values: co2eq = 0x%x, tvoc = 0x%x"
+              % (sgp30.baseline_co2eq, sgp30.baseline_tvoc))