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Added correction factor for Rs/R0 (Ratio)

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miguel5612 2022-03-20 09:48:02 -05:00
parent 1f8310a6e7
commit 964204706f
2 changed files with 3 additions and 2 deletions
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3
src/MQUnifiedsensor.cpp
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@ -133,7 +133,7 @@ float MQUnifiedsensor::validateEcuation(float ratioInput)
//Serial.println("Result: "); Serial.println(_PPM);
return _PPM;
}
float MQUnifiedsensor::readSensor(bool isMQ303A)
float MQUnifiedsensor::readSensor(bool isMQ303A, float correctionFactor)
{
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
if(isMQ303A) {
@ -142,6 +142,7 @@ float MQUnifiedsensor::readSensor(bool isMQ303A)
_RS_Calc = ((_VOLT_RESOLUTION*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas
if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted.
_ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
_ratio += correctionFactor;
if(_ratio <= 0) _ratio = 0; //No negative values accepted or upper datasheet recomendation.
if(_regressionMethod == 1) _PPM= _a*pow(_ratio, _b); // <- Source excel analisis https://github.com/miguel5612/MQSensorsLib_Docs/tree/master/Internal_design_documents
else

2
src/MQUnifiedsensor.h
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@ -31,7 +31,7 @@ class MQUnifiedsensor
//user functions
float calibrate(float ratioInCleanAir);
float readSensor(bool isMQ303A = false);
float readSensor(bool isMQ303A = false, float correctionFactor = 0.0);
float readSensorR0Rs();
float validateEcuation(float ratioInput = 0);