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miguel5612 2020-03-28 12:25:48 -05:00
parent 8bdb1fc193
commit ce87a05178
1 changed files with 3 additions and 1 deletions
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src/MQUnifiedsensor.cpp
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@ -112,6 +112,7 @@ float MQUnifiedsensor::validateEcuation(float ratioInput)
if(_regressionMethod == 1) _PPM= _a*pow(ratioInput, _b); if(_regressionMethod == 1) _PPM= _a*pow(ratioInput, _b);
else else
{ {
// https://jayconsystems.com/blog/understanding-a-gas-sensor
double ppm_log = (log10(_ratio)-_b)/_a; //Get ppm value in linear scale according to the the ratio value double ppm_log = (log10(_ratio)-_b)/_a; //Get ppm value in linear scale according to the the ratio value
_PPM = pow(10, ppm_log); //Convert ppm value to log scale _PPM = pow(10, ppm_log); //Convert ppm value to log scale
} }
@ -126,9 +127,10 @@ float MQUnifiedsensor::readSensor()
if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted. if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted.
_ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air _ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
if(_ratio <= 0) _ratio = 0; //No negative values accepted or upper datasheet recomendation. if(_ratio <= 0) _ratio = 0; //No negative values accepted or upper datasheet recomendation.
if(_regressionMethod == 1) _PPM= _a*pow(_ratio, _b); if(_regressionMethod == 1) _PPM= _a*pow(_ratio, _b); // <- Source excel analisis https://github.com/miguel5612/MQSensorsLib_Docs/tree/master/Internal_design_documents
else else
{ {
// https://jayconsystems.com/blog/understanding-a-gas-sensor <- Source of linear ecuation
double ppm_log = (log10(_ratio)-_b)/_a; //Get ppm value in linear scale according to the the ratio value double ppm_log = (log10(_ratio)-_b)/_a; //Get ppm value in linear scale according to the the ratio value
_PPM = pow(10, ppm_log); //Convert ppm value to log scale _PPM = pow(10, ppm_log); //Convert ppm value to log scale
} }