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Fixed example

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This commit is contained in:
miguel5612 2020-03-26 11:39:50 -05:00
parent d79a303ce9
commit 532a83e186
3 changed files with 9 additions and 5 deletions
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3
examples/MQ-3/MQ-3.ino
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@ -21,10 +21,11 @@
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino
#define type "MQ-3" //MQ3
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor
MQUnifiedsensor MQ3(placa, Voltage_Resolution, pin, type);
MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
//Variables
float CH4, LPG, CO, Alcohol, Hexane, Benzine;

8
src/MQUnifiedsensor.cpp
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@ -1,10 +1,11 @@
#include "MQUnifiedsensor.h"
MQUnifiedsensor::MQUnifiedsensor(String Placa, double Voltage_Resolution, int pin, String type) {
MQUnifiedsensor::MQUnifiedsensor(String Placa, double Voltage_Resolution, int ADC_Bit_Resolution, int pin, String type) {
this->_pin = pin;
this->_type = type; //MQ-2, MQ-3 ... MQ-309A
this->_placa = Placa;
this-> _VOLT_RESOLUTION = Voltage_Resolution;
this-> _ADC_Bit_Resolution = ADC_Bit_Resolution;
}
void MQUnifiedsensor::init()
{
@ -53,6 +54,7 @@ void MQUnifiedsensor::serialDebug(bool onSetup)
Serial.println("Sensor: " + _type);
Serial.print("Supply voltage: "); Serial.print(_VOLT_RESOLUTION); Serial.println(" VDC");
Serial.print("ADC Resolution: "); Serial.print(_ADC_Bit_Resolution); Serial.println(" Bits");
Serial.print("R0: "); Serial.print(_R0); Serial.println(" KΩ");
Serial.print("RL: "); Serial.print(_RL); Serial.println(" KΩ");
@ -74,7 +76,7 @@ void MQUnifiedsensor::serialDebug(bool onSetup)
String eq = "";
if(_regressionMethod == "Linear") eq = "ratio*a + b";
if(_regressionMethod == "Exponential") eq = "a*ratio^b";
Serial.print("|"); Serial.print(_adc); Serial.print("| v = ADC*"); Serial.print(_VOLT_RESOLUTION); Serial.print("/1024 | "); Serial.print(_sensor_volt);
Serial.print("|"); Serial.print(_adc); Serial.print("| v = ADC*"); Serial.print(_VOLT_RESOLUTION); Serial.print("/"); Serial.print(pow(2, _ADC_Bit_Resolution)); Serial.print(" | "); Serial.print(_sensor_volt);
Serial.print(" | RS = ((" ); Serial.print(_VOLT_RESOLUTION ); Serial.print("*RL)/Voltage) - RL| "); Serial.print(_RS_Calc); Serial.print(" | Ratio = RS/R0| ");
Serial.print(_ratio); Serial.print( " | " + eq + " | "); Serial.print(_PPM); Serial.println(" |");
}
@ -90,7 +92,7 @@ float MQUnifiedsensor::readSensor()
_RS_Calc = ((_VOLT_RESOLUTION*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas
if(_RS_Calc < 0) _RS_Calc = 0; //No negative values accepted.
_ratio = _RS_Calc / this->_R0; // Get ratio RS_gas/RS_air
if(_ratio <= 0 || _ratio>100) _ratio = 0.01; //No negative values accepted or upper datasheet recomendation.
if(_ratio <= 0) _ratio = 0; //No negative values accepted or upper datasheet recomendation.
if(_regressionMethod == "Exponential") _PPM= _a*pow(_ratio, _b);
if(_regressionMethod == "Linear") _PPM= _a*_ratio + _b;
if(_PPM < 0) _PPM = 0; //No negative values accepted or upper datasheet recomendation.

3
src/MQUnifiedsensor.h
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@ -13,7 +13,7 @@
class MQUnifiedsensor
{
public:
MQUnifiedsensor(String Placa = "Arduino", double Voltage_Resolution = 5, int pin = 1, String type = "CUSTOM MQ");
MQUnifiedsensor(String Placa = "Arduino", double Voltage_Resolution = 5, int ADC_Bit_Resolution = 10, int pin = 1, String type = "CUSTOM MQ");
//Functions to set values
void init();
@ -44,6 +44,7 @@ class MQUnifiedsensor
byte _VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3
byte _ratioInCleanAir;
byte _RL = 10; //Value in KiloOhms
byte _ADC_Bit_Resolution = 10;
double _adc, _a, _b, _sensor_volt;
float _R0, RS_air, _ratio, _PPM, _RS_Calc;