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miguel5612 2019-05-29 21:28:35 -05:00
parent 37db4af4bf
commit 33c9ae2c7c
2 changed files with 19 additions and 5 deletions
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4
src/MQUnifiedsensor.cpp
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@ -139,7 +139,7 @@ int MQUnifiedsensor::readPPM(int m, int b) {
double sensor_volt = this->getVoltage(); double sensor_volt = this->getVoltage();
double RS_gas; //Define variable for sensor resistance double RS_gas; //Define variable for sensor resistance
RS_gas = ((5.0 * 10.0) / sensor_volt) - 10.0; //Get value of RS in a gas RS_gas = ((VOLT_RESOLUTION*RLValue)/sensor_volt)-RLValue; //Get value of RS in a gas
_ratio = RS_gas / this->_R0; // Get ratio RS_gas/RS_air _ratio = RS_gas / this->_R0; // Get ratio RS_gas/RS_air
@ -147,7 +147,7 @@ int MQUnifiedsensor::readPPM(int m, int b) {
double ppm = pow(10, ppm_log); //Convert ppm value to log scale double ppm = pow(10, ppm_log); //Convert ppm value to log scale
return floor(ppm); return floor(ppm);
} }
double MQUnifiedsensor::calibrate() { int MQUnifiedsensor::calibrate() {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
/* /*
V = I x R V = I x R

20
src/MQUnifiedsensor.h
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@ -12,7 +12,7 @@
int VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3 int VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3
int RLValue = 10; //Value in KiloOhms int RLValue = 10; //Value in KiloOhms
int _ratioInCleanAir, _PPM; int _ratioInCleanAir, _PPM;
double RS_air,_R0, _m, _b, _ratio; double RS_air, _m, _b, _ratio;
/************************Hardware Related Macros************************************/ /************************Hardware Related Macros************************************/
@ -45,6 +45,20 @@ double RS_air,_R0, _m, _b, _ratio;
#define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm #define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm
#define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm #define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm
//From the calibration program we can obtain the R0 value for each sensor
#define R0_MQ2 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ3 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ4 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ5 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ6 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ7 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ8 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ9 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ131 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ135 1//R0 after 48 hours pre-heating the sensor
#define R0_MQ303 1 //R0 after 48 hours pre-heating the sensor
#define R0_MQ309 1 //R0 after 48 hours pre-heating the sensor
/***********************Software Related Macros************************************/ /***********************Software Related Macros************************************/
#define ADC_RESOLUTION 10 // for 10bit analog to digital converter. #define ADC_RESOLUTION 10 // for 10bit analog to digital converter.
@ -80,7 +94,7 @@ class MQUnifiedsensor
int readSensor(String nameLectureRequeired = "", bool print = false); int readSensor(String nameLectureRequeired = "", bool print = false);
int readPPM(int m, int b); int readPPM(int m, int b);
double calibrate(); int calibrate();
double getVoltage(); double getVoltage();
double stringToDouble(String & str); double stringToDouble(String & str);
@ -89,7 +103,7 @@ class MQUnifiedsensor
private: private:
int _pin, _type; int _pin, _type, _R0;
String _MQ[19], _nameLectureRequeired; String _MQ[19], _nameLectureRequeired;
}; };