Merge pull request #20 from Airviz/multiple-featureset-values

Added support for newer SGP30 chips which use a featureset value of 0x0022

Author: ladyada

adafruit_sgp30.py

@@ -51,7 +51,7 @@
 
 # pylint: disable=bad-whitespace
 _SGP30_DEFAULT_I2C_ADDR  = const(0x58)
-_SGP30_FEATURESET        = const(0x0020)
+_SGP30_FEATURESETS       = (0x0020, 0x0022)
 
 _SGP30_CRC8_POLYNOMIAL   = const(0x31)
 _SGP30_CRC8_INIT         = const(0xFF)
@@ -71,7 +71,7 @@ def __init__(self, i2c, address=_SGP30_DEFAULT_I2C_ADDR):
         self.serial = self._i2c_read_words_from_cmd([0x36, 0x82], 0.01, 3)
         # get featureset
         featureset = self._i2c_read_words_from_cmd([0x20, 0x2f], 0.01, 1)
-        if featureset[0] != _SGP30_FEATURESET:
+        if featureset[0] not in _SGP30_FEATURESETS:
             raise RuntimeError('SGP30 Not detected')
         self.iaq_init()