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fixed a bug with negative uv values

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Kristjan Komlosi
2019-11-02 12:38:18 +01:00
parent 9d9a192d8b
commit ffdb162ad4
1 changed files with 9 additions and 4 deletions
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13
backend/sensors.py
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@@ -206,14 +206,19 @@ class UVSensor:
# scary computations ahead! refer to Vishay app note 84339 and Sparkfun # scary computations ahead! refer to Vishay app note 84339 and Sparkfun
# VEML6075 documentation. # VEML6075 documentation.
# first, compensate for visible and IR noise # compensate for visible and IR noise
aCorr = aRaw - 2.22 * c1 - 1.33 * c2 aCorr = aRaw - 2.22 * c1 - 1.33 * c2
bCorr = bRaw - 2.95 * c1 - 1.74 * c2 bCorr = bRaw - 2.95 * c1 - 1.74 * c2
# second, convert values into irradiances # convert values into irradiances
a = aCorr * 0.00110 a = aCorr * 1.06
b = bCorr * 0.00125 b = bCorr * 0.48
# zero out negative results (readings with no uv)
if a < 0:
a = 0
if b < 0:
b = 0
# last, calculate the UV index # last, calculate the UV index
i = (a + b) / 2 i = (a + b) / 2