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Ensure a float return for lux. #18

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Dec 28, 2018
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Ensure a float return for lux. #18

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4 changes: 2 additions & 2 deletions adafruit_tsl2561.py
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Original file line number Diff line number Diff line change
Expand Up @@ -107,7 +107,7 @@ def enabled(self, enable):

@property
def lux(self):
"""The computed lux value."""
"""The computed lux value or None when value is not computable."""
return self._compute_lux()

@property
Expand Down Expand Up @@ -177,7 +177,7 @@ def _compute_lux(self):
elif ratio <= 1.30:
lux = 0.00146 * ch0 - 0.00112 * ch1
else:
lux = 0
lux = 0.
# Pretty sure the floating point math formula on pg. 23 of datasheet
# is based on 16x gain and 402ms integration time. Need to scale
# result for other settings.
Expand Down