diff --git a/src/MQUnifiedsensor.cpp b/src/MQUnifiedsensor.cpp index 05b4492..cf481c0 100644 --- a/src/MQUnifiedsensor.cpp +++ b/src/MQUnifiedsensor.cpp @@ -142,11 +142,13 @@ float MQUnifiedsensor::validateEcuation(float ratioInput) float MQUnifiedsensor::readSensor(bool isMQ303A, float correctionFactor, bool injected) { //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor + float voltRes = _VOLT_RESOLUTION; // preserve global resolution if(isMQ303A) { voltRes = voltRes - 0.45; //Calculations for RS using mq303a sensor look wrong #42 } _RS_Calc = ((voltRes*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas + if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted. if(!injected) _ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air _ratio += correctionFactor;