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miguel5612 2019-08-14 20:47:24 -05:00
parent 4c0c92f8a7
commit 8a929cff7f
3 changed files with 32 additions and 38 deletions
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WPDigitalizer/MQ3/MQ3_Analisis.xlsx
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34
src/MQUnifiedsensor.cpp
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@ -90,6 +90,10 @@
//_MQ = MQ309;
}
}
void MQUnifiedsensor::update()
{
_sensor_volt = this->getVoltage();
}
void MQUnifiedsensor::setVoltResolution(float voltaje)
{
_VOLT_RESOLUTION = voltaje;
@ -100,18 +104,19 @@ void MQUnifiedsensor::inicializar()
}
int MQUnifiedsensor::readSensor(String nameLectureRequeired, bool print)
{
setSensorCharacteristics(nameLectureRequeired, print);
_PPM =readPPM(_m, _b);
setSensorCharacteristics(nameLectureRequeired, print); //In this function update _a and _b
_RS_Calc = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Get value of RS in a gas
_ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
_PPM= a*pow(_ratio, b);
if(print)
{
String nameLecture = getnameLecture();
Serial.println("**********************");
Serial.println("* PPM_log = (log10(Rs/R0) - b)/m");
Serial.println("* PPM = pow(10, PPM_Log)");
Serial.println("* Sensor: MQ-" + String(_type));
Serial.println("* m =" + String(_m) + " ,b =" + String(_b) + ", R0 = " + _R0);
Serial.println("* Vcc: " + String(_VOLT_RESOLUTION) + ", RS: " + String(_RS_Calc));
Serial.println("* RS/R0 = " + String(_ratio) + " ,Voltaje leido(ADC): " + String(_sensor_volt));
Serial.println("* PPM = " + _a + "pow(Rs/R0, +" + _b + ")");
Serial.println("* Lectura(" + nameLecture + ")=" + String(_PPM) + " PPM");
Serial.println("**********************");
}
@ -515,19 +520,6 @@ void MQUnifiedsensor::setSensorCharacteristics(String nameLectureRequeired, bool
}
//Serial debugging
}
float MQUnifiedsensor::readPPM(int m, int b) {
/**
* Returns the PPM concentration
*/
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
_sensor_volt = this->getVoltage();
//_RS_Calc; //Define variable for sensor resistance
_RS_Calc = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Get value of RS in a gas
_ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
float ppm = a*pow(_ratio, b);
return floor(ppm);
}
long MQUnifiedsensor::calibrate(boolean print) {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
/*
@ -541,17 +533,15 @@ long MQUnifiedsensor::calibrate(boolean print) {
RS = [(VC x RL) - (VRL x RL)] / VRL
RS = [(VC x RL) / VRL] - RL
*/
_sensor_volt; //Define variable for sensor voltage
float RS_air; //Define variable for sensor resistance
float R0; //Define variable for R0
_sensor_volt = this->getVoltage(); //Convert average to voltage
RS_air = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Calculate RS in fresh air
R0 = RS_air/_ratioInCleanAir; //Calculate R0
if(print)
{
Serial.println("*******Calibrating*********");
Serial.println("* Vcc: " + String(_VOLT_RESOLUTION) + "*");
Serial.println("* Sensor: MQ-" + String(_type) + "*");
Serial.println("* Vcc: " + String(_VOLT_RESOLUTION) + "*");
Serial.println("* _sensor_volt: " + String(_sensor_volt) + "*");
Serial.println("* _RLValue: " + String(_RLValue) + "*");
Serial.println("* _ratioInCleanAir: " + String(_ratioInCleanAir) + "*");
@ -561,7 +551,7 @@ long MQUnifiedsensor::calibrate(boolean print) {
return R0;
}
double MQUnifiedsensor::getVoltage(int read) {
double voltage = _sensor_volt;
double voltage = 0;
if(read)
{
double avg = 0.0;

36
src/MQUnifiedsensor.h
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@ -83,23 +83,23 @@
#define MQ2_Benzene_b 2.7901
/********************** MQ3 ******************************************************/
#define MQ3_LPG_a -3.1851
#define MQ3_LPG_b 4.7048
#define MQ3_LPG_a 44771
#define MQ3_LPG_b -3.245
#define MQ3_CH4_a -17.531
#define MQ3_CH4_b 28.785
#define MQ3_CH4_a 2*10^31
#define MQ3_CH4_b 19.01
#define MQ3_CO_a -4.339
#define MQ3_CO_b 6.4432
#define MQ3_CO_a 521853
#define MQ3_CO_b -3.821
#define MQ3_Alcohol_a -1.435
#define MQ3_Alcohol_b 0.4103
#define MQ3_Alcohol_a 0.3934
#define MQ3_Alcohol_b -1.504
#define MQ3_Benzene_a -2.7009
#define MQ3_Benzene_b 0.632
#define MQ3_Benzene_a 1.8006
#define MQ3_Benzene_b -0.373
#define MQ3_Hexane_a -2.7268
#define MQ3_Hexane_b 3.6299
#define MQ3_Hexane_a 22.996
#define MQ3_Hexane_b -0.351
/********************** MQ4 ******************************************************/
#define MQ4_LPG_a -2.5818
@ -267,20 +267,24 @@ class MQUnifiedsensor
{
public:
MQUnifiedsensor(int pin, int type);
//Functions to set values
void inicializar();
void update();
void setR0(double R0);
void setVoltResolution(float voltaje);
void setSensorCharacteristics(String nameLectureReqeuired, bool print);
void setDefaultGas();
//user functions
long calibrate(boolean print = false);
int readSensor(String nameLectureRequeired = "", bool print = false);
long calibrate(boolean print = false);
double getVoltage(int read = true);
double stringToDouble(String & str);
//get function for info
double getR0();
float readPPM(int m, int b);
double getVoltage(int read = true);
double stringToDouble(String & str);
String getnameLecture();