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MQSensorsLib
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Fixed example

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pull/33/head
miguel5612 5 years ago
parent 1177d5827d
commit 3ae663163b
3 changed files with 26 additions and 64 deletions
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83
examples/MQ-3/MQ-3.ino
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@ -9,6 +9,10 @@
modified 23 May 2019
by Miguel Califa
Updated library usage
modified 26 March 2020
by Miguel Califa
This example code is in the public domain.
*/
@ -31,79 +35,38 @@ MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
float CH4, LPG, CO, Alcohol, Hexane, Benzine;
void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
//init the sensor
/***************************** MQInicializar****************************************
Input: pin, type
Output:
Remarks: This function create the sensor object.
************************************************************************************/
MQ3.setRegressionMethod("Exponential");
//Set math model to calculate the PPM concentration and the value of constants
MQ3.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values to get Benzene concentration
// Calibration setup
MQ3.setR0(3.86018237);
/*
//Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo:
//If the RL value is different from 10K please assign your RL value with the following method:
MQ3.setRL(10);
*/
/***************************** MQ Init ********************************************/
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ3.init();
/***************************** MQ Init ********************************************/
//Input: setup flag, if this function are on setup will print the headers (Optional - Default value: False)
//Output: print on serial port the information about sensor and sensor readings
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ3.serialDebug(true);
//pinMode(calibration_button, INPUT);
}
void loop() {
MQ3.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ3.readSensor(); // Sensor will read PPM concentration using the a and b values setted before or on setup
MQ3.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ3.serialDebug(); // Will print the table on the serial port
/*
//Rutina de calibracion - Uncomment if you need (setup too and header)
if(calibration_button)
{
float R0 = MQ3.calibrate();
MQ3.setR0(R0);
}
*/
/***************************** MQReadSensor ****************************************
Input: Gas - Serial print flag
Output: Value in PPM
Remarks: This function use readPPM to read the value in PPM the gas in the air.
************************************************************************************/
//Read the sensor and print in serial port
//Lecture will be saved in lecture variable
//float lecture = MQ3.readSensor("", true); // Return Alcohol concentration
// Options, uncomment where you need
/*
MQ3.setA(2*10^31); MQ3.setB(19.01); // Configurate the ecuation values
CH4 = MQ3.readSensor(); // Return CH4 concentration
MQ3.setA(44771); MQ3.setB(-3.245); // Configurate the ecuation values
LPG = MQ3.readSensor(); // Return LPG concentration
MQ3.setA(521853); MQ3.setB(-3.821); // Configurate the ecuation values
CO = MQ3.readSensor(); // Return CO concentration
MQ3.setA(0.3934); MQ3.setB(-1.504); // Configurate the ecuation values
Alcohol = MQ3.readSensor(); // Return Alcohol concentration
MQ3.setA(7585.3); MQ3.setB(-2.849); // Configurate the ecuation values
Hexane = MQ3.readSensor(); // Return Hexane concentration
MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values
Benzine = MQ3.readSensor(); // Return Benzene concentration
*/
/*
Serial.println("***************************");
Serial.println("Lectures for MQ-3");
Serial.print("Volt: ");Serial.print(MQ3.getVoltage(false));Serial.println(" V");
Serial.print("R0: ");Serial.print(MQ3.getR0());Serial.println(" Ohm");
Serial.print("CH4: ");Serial.print(CH4,2);Serial.println(" mg/L");
Serial.print("LPG: ");Serial.print(LPG,2);Serial.println(" mg/L");
Serial.print("CO: ");Serial.print(CO,2);Serial.println(" mg/L");
Serial.print("Alcohol: ");Serial.print(Alcohol,2);Serial.println(" mg/L");
Serial.print("Hexane: ");Serial.print(Hexane,2);Serial.println(" mg/L");
Serial.print("Benzine: ");Serial.print(Benzine,2);Serial.println(" mg/L");
Serial.println("***************************");
*/
delay(500); //Sampling frequency
}

4
src/MQUnifiedsensor.cpp
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@ -99,7 +99,7 @@ float MQUnifiedsensor::readSensor()
//if(_PPM > 10000) _PPM = 99999999; //No negative values accepted or upper datasheet recomendation.
return _PPM;
}
float MQUnifiedsensor::calibrate() {
float MQUnifiedsensor::calibrate(float ratioInCleanAir) {
//More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
/*
V = I x R
@ -116,7 +116,7 @@ float MQUnifiedsensor::calibrate() {
float R0; //Define variable for R0
RS_air = ((_VOLT_RESOLUTION*_RL)/_sensor_volt)-_RL; //Calculate RS in fresh air
if(RS_air < 0) RS_air = 0; //No negative values accepted.
R0 = RS_air/_ratioInCleanAir; //Calculate R0
R0 = RS_air/ratioInCleanAir; //Calculate R0
if(R0 < 0) R0 = 0; //No negative values accepted.
return R0;
}

3
src/MQUnifiedsensor.h
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@ -27,7 +27,7 @@ class MQUnifiedsensor
void serialDebug(bool onSetup = false); //Show on serial port information about sensor
//user functions
float calibrate();
float calibrate(float ratioInCleanAir);
float readSensor();
//get function for info
@ -42,7 +42,6 @@ class MQUnifiedsensor
byte _pin;
byte _firstFlag = false;
byte _VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3
byte _ratioInCleanAir;
byte _RL = 10; //Value in KiloOhms
byte _ADC_Bit_Resolution = 10;

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