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Merge pull request #212 from airgradienthq/feature/correct-pm2.5-formula

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correct pm2.5 formula to show value on display
This commit is contained in:
AirGradient
2024-08-18 11:32:50 +07:00
committed by GitHub
parent 0a9142204d f3a9c722b2
commit 219ff73132
8 changed files with 86 additions and 0 deletions
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35
src/PMS/PMS.cpp
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@ -270,6 +270,41 @@ int PMSBase::pm25ToAQI(int pm02) {
return 500;
}
/**
* @brief Correction PM2.5
*
* @param pm25 Raw PM2.5 value
* @param humidity Humidity value (%)
* @return int
*/
int PMSBase::compensated(int pm25, float humidity) {
float value;
if (humidity < 0) {
humidity = 0;
}
if (humidity > 100) {
humidity = 100;
}
if(pm25 < 30) {
value = (pm25 * 0.524f) - (humidity * 0.0862f) + 5.75f;
} else if(pm25 < 50) {
value = (0.786f * (pm25 / 20 - 3 / 2) + 0.524f * (1 - (pm25 / 20 - 3 / 2))) * pm25 - (0.0862f * humidity) + 5.75f;
} else if(pm25 < 210) {
value = (0.786f * pm25) - (0.0862f * humidity) + 5.75f;
} else if(pm25 < 260) {
value = (0.69f * (pm25/50 - 21/5) + 0.786f * (1 - (pm25/50 - 21/5))) * pm25 - (0.0862f * humidity * (1 - (pm25/50 - 21/5))) + (2.966f * (pm25/50 -21/5)) + (5.75f * (1 - (pm25/50 - 21/5))) + (8.84f * (1.e-4) * pm25* (pm25/50 - 21/5));
} else {
value = 2.966f + (0.69f * pm25) + (8.84f * (1.e-4) * pm25);
}
if(value < 0) {
value = 0;
}
return (int)value;
}
/**
* @brief Convert two byte value to uint16_t value
*