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0.2.0 SGP30 + add formula comment

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rob tillaart 2023-02-27 11:48:52 +01:00
parent 220d231e92
commit 9a94d6da1b
1 changed files with 6 additions and 1 deletions
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7
libraries/SGP30/SGP30.cpp
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@ -269,6 +269,11 @@ float SGP30::getEthanol()
// CALIBRATION
//
// slightly different formula
// https://carnotcycle.wordpress.com/2012/08/04/how-to-convert-relative-humidity-to-absolute-humidity/
// Absolute Humidity (grams/m3) = 6.112 × e^[(17.67 × T)/(T+243.5)] × rh × 2.1674
// (273.15+T)
// T in °C
// RH == RelativeHumidity
float SGP30::setRelHumidity(float T, float RH) // Page 10
@ -276,7 +281,7 @@ float SGP30::setRelHumidity(float T, float RH) // Page 10
// page 10 datasheet
// AH = AbsoluteHumidity
// uint16_t AH = 216.7 * RH/100 * 6.117 * exp((17.62 * T)/(243.12 + T)) / (273.15 + T);
float absoluteHumidity = (2.167 * 6.112) * RH ;
float absoluteHumidity = (2.167 * 6.112) * RH;
absoluteHumidity *= exp((17.62 * T)/(243.12 + T));
absoluteHumidity /= (273.15 + T);