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Match compensate_humidity algo to the one published by BoschSensortec #11

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Merged
merged 1 commit into from
Oct 28, 2020
Merged

Match compensate_humidity algo to the one published by BoschSensortec #11

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24 changes: 15 additions & 9 deletions library/bme280/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -69,12 +69,12 @@ def __init__(self):
self.dig_p8 = 0
self.dig_p9 = 0

self.dig_h1 = 0
self.dig_h2 = 0
self.dig_h3 = 0
self.dig_h4 = 0
self.dig_h5 = 0
self.dig_h6 = 0
self.dig_h1 = 0.0
self.dig_h2 = 0.0
self.dig_h3 = 0.0
self.dig_h4 = 0.0
self.dig_h5 = 0.0
self.dig_h6 = 0.0

self.temperature_fine = 0

Expand Down Expand Up @@ -108,9 +108,15 @@ def compensate_pressure(self, raw_pressure):
return pressure + (var1 + var2 + self.dig_p7) / 16.0

def compensate_humidity(self, raw_humidity):
humidity = self.temperature_fine - 76800.0
humidity = (raw_humidity - (self.dig_h4 * 64.0 + self.dig_h5 / 16384.0 * humidity)) * (self.dig_h2 / 65536.0 * (1.0 + self.dig_h6 / 67108864.0 * humidity * (1.0 + self.dig_h3 / 67108864.0 * humidity)))
humidity = humidity * (1.0 - self.dig_h1 * humidity / 524288.0)
var1 = self.temperature_fine - 76800.0
var2 = self.dig_h4 * 64.0 + (self.dig_h5 / 16384.0) * var1
var3 = raw_humidity - var2
var4 = self.dig_h2 / 65536.0
var5 = 1.0 + (self.dig_h3 / 67108864.0) * var1
var6 = 1.0 + (self.dig_h6 / 67108864.0) * var1 * var5
var6 = var3 * var4 * (var5 * var6)

humidity = var6 * (1.0 - self.dig_h1 * var6 / 524288.0)
return max(0.0, min(100.0, humidity))


Expand Down