From aa11343a97290e199f44e4fa1c2d82e22a3cd3d0 Mon Sep 17 00:00:00 2001 From: miguel5612 Date: Thu, 26 Mar 2020 10:23:51 -0500 Subject: [PATCH] Fixed mq-3 example --- examples/MQ-3/MQ-3.ino | 25 ++++++++++++++++++------- src/MQUnifiedsensor.cpp | 15 +++++++++++---- src/MQUnifiedsensor.h | 8 +++++--- 3 files changed, 34 insertions(+), 14 deletions(-) diff --git a/examples/MQ-3/MQ-3.ino b/examples/MQ-3/MQ-3.ino index e6791e0..fc6d1f7 100644 --- a/examples/MQ-3/MQ-3.ino +++ b/examples/MQ-3/MQ-3.ino @@ -35,7 +35,7 @@ void setup() { Output: Remarks: This function create the sensor object. ************************************************************************************/ - MQ3.inicializar(); + MQ3.init(); //pinMode(calibration_button, INPUT); } @@ -62,12 +62,23 @@ void loop() { //Lecture will be saved in lecture variable //float lecture = MQ3.readSensor("", true); // Return Alcohol concentration // Options, uncomment where you need - CH4 = MQ3.readSensor("CH4"); // Return CH4 concentration - LPG = MQ3.readSensor("LPG"); // Return LPG concentration - CO = MQ3.readSensor("CO"); // Return CO concentration - Alcohol = MQ3.readSensor("Alcohol"); // Return Alcohol concentration - Hexane = MQ3.readSensor("Hexane"); // Return Hexane concentration - Benzine = MQ3.readSensor("Benzene"); // Return Benzene concentration + MQ3.setA(2*10^31); MQ3.setB(19.01); // Configurate the ecuation values + CH4 = MQ3.readSensor("Exponential"); // Return CH4 concentration + + MQ3.setA(44771); MQ3.setB(-3.245); // Configurate the ecuation values + LPG = MQ3.readSensor("Exponential"); // Return LPG concentration + + MQ3.setA(521853); MQ3.setB(-3.821); // Configurate the ecuation values + CO = MQ3.readSensor("Exponential"); // Return CO concentration + + MQ3.setA(0.3934); MQ3.setB(-1.504); // Configurate the ecuation values + Alcohol = MQ3.readSensor("Exponential"); // Return Alcohol concentration + + MQ3.setA(7585.3); MQ3.setB(-2.849); // Configurate the ecuation values + Hexane = MQ3.readSensor("Exponential"); // Return Hexane concentration + + MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values + Benzine = MQ3.readSensor("Exponential"); // Return Benzene concentration Serial.println("***************************"); Serial.println("Lectures for MQ-3"); diff --git a/src/MQUnifiedsensor.cpp b/src/MQUnifiedsensor.cpp index 6ff2b8e..e6ff804 100644 --- a/src/MQUnifiedsensor.cpp +++ b/src/MQUnifiedsensor.cpp @@ -6,7 +6,13 @@ MQUnifiedsensor::MQUnifiedsensor(String Placa, int Voltage_Resolution, int pin, this->_placa = Placa; this-> _VOLT_RESOLUTION = Voltage_Resolution; } -MQUnifiedsensor::serialDebug(boolean onSetup) +MQUnifiedsensor::setA(double a) { + this->_a = a; +} +MQUnifiedsensor::setB(double b) { + this->_b = b; +} +MQUnifiedsensor::serialDebug(boolean onSetup, String regressionMethod) { if(onSetup) { @@ -40,6 +46,7 @@ MQUnifiedsensor::serialDebug(boolean onSetup) else { String eq = ""; + if(regression == "Linear") eq = "ratio*a + b" if(regression == "Exponential") eq = "a*ratio^b" Serial.println("|" + _adc + "|" + "v = ADC*" + _VOLT_RESOLUTION + "/1024" + "|" + _sensor_volt + "|" + "RS = ((" + _VOLT_RESOLUTION + "*RL)/Voltage) - RL" + "|" + _RS_Calc + "|" + "Ratio = RS/R0" + "|" + _ratio + "|" + eq + "|" + _PPM); } @@ -57,15 +64,15 @@ void MQUnifiedsensor::init() { pinMode(_pin, INPUT); } -float MQUnifiedsensor::readSensor(String nameLectureRequeired) +float MQUnifiedsensor::readSensor(String regressionMethod) { - setSensorCharacteristics(nameLectureRequeired, print); //In this function update _a and _b //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor _RS_Calc = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //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. - _PPM= _a*pow(_ratio, _b); + 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. if(_PPM > 10000) _PPM = 9999; //No negative values accepted or upper datasheet recomendation. return _PPM; diff --git a/src/MQUnifiedsensor.h b/src/MQUnifiedsensor.h index 7fc261c..20e8113 100644 --- a/src/MQUnifiedsensor.h +++ b/src/MQUnifiedsensor.h @@ -20,12 +20,14 @@ class MQUnifiedsensor void update(); void setR0(double R0 = 10); void setRL(double RL = 10); + void setA(double a); + void setB(double b); void setVoltResolution(double voltage_resolution = 5); void serialDebug(boolean onSetup = false); //Show on serial port information about sensor //user functions - float calibrate(boolean print = false); - float readSensor(