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RZERO configurable via constructor #12

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RZERO configurable via constructor #12

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7 changes: 4 additions & 3 deletions MQ135.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -24,8 +24,9 @@ v1.0 - First release
*/
/**************************************************************************/

MQ135::MQ135(uint8_t pin) {
MQ135::MQ135(uint8_t pin, float rzero) {
_pin = pin;
_rzero = rzero;
}


Expand Down Expand Up @@ -78,7 +79,7 @@ float MQ135::getCorrectedResistance(float t, float h) {
*/
/**************************************************************************/
float MQ135::getPPM() {
return PARA * pow((getResistance()/RZERO), -PARB);
return PARA * pow((getResistance()/_rzero), -PARB);
}

/**************************************************************************/
Expand All @@ -93,7 +94,7 @@ float MQ135::getPPM() {
*/
/**************************************************************************/
float MQ135::getCorrectedPPM(float t, float h) {
return PARA * pow((getCorrectedResistance(t, h)/RZERO), -PARB);
return PARA * pow((getCorrectedResistance(t, h)/_rzero), -PARB);
}

/**************************************************************************/
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3 changes: 2 additions & 1 deletion MQ135.h
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Expand Up @@ -41,9 +41,10 @@ v1.0 - First release
class MQ135 {
private:
uint8_t _pin;
float _rzero;

public:
MQ135(uint8_t pin);
MQ135(uint8_t pin, float rzero = RZERO);
float getCorrectionFactor(float t, float h);
float getResistance();
float getCorrectedResistance(float t, float h);
Expand Down