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Merge pull request #79 from miguel5612/codex/modificar-cálculo-usando-voltres-en-readsensor

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Fix voltage resolution side effect
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Miguel Angel Califa Urquiza 2025-06-04 17:50:20 -05:00 committed by GitHub
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1 changed files with 5 additions and 6 deletions
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src/MQUnifiedsensor.cpp
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@ -142,14 +142,13 @@ float MQUnifiedsensor::validateEcuation(float ratioInput)
float MQUnifiedsensor::readSensor(bool isMQ303A, float correctionFactor, bool injected) float MQUnifiedsensor::readSensor(bool isMQ303A, float correctionFactor, bool injected)
{ {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
float voltageResolution = _VOLT_RESOLUTION;
float voltRes = _VOLT_RESOLUTION; // preserve global resolution
if(isMQ303A) { if(isMQ303A) {
// Issue #42: MQ303A requires a 0.45V offset for the RS calculation. The voltRes = voltRes - 0.45; //Calculations for RS using mq303a sensor look wrong #42
// previous implementation permanently decreased _VOLT_RESOLUTION every time
// the sensor was read which produced incorrect results after multiple calls.
voltageResolution -= 0.45;
} }
_RS_Calc = ((voltageResolution*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas _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(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted.
if(!injected) _ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air if(!injected) _ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
_ratio += correctionFactor; _ratio += correctionFactor;