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Updated MQ-2 Example

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miguel5612 2020-03-26 12:27:02 -05:00
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examples/MQ-2/MQ-2.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.
*/
@ -17,65 +21,50 @@
#include <MQUnifiedsensor.h>
//Definitions
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino
#define type 2 //MQ2
#define type "MQ-2" //MQ2
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor
MQUnifiedsensor MQ2(pin, type);
MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
//Variables
float H2, LPG, CO, Alcohol, Propane, Benzene;
float CH4, LPG, CO, Alcohol, Hexane, Benzine;
void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
/***************************** MQInicializar****************************************
Input:
Output:
Remarks: This function configure the pinMode
************************************************************************************/
//init the sensor
MQ2.inicializar();
//pinMode(calibration_button, INPUT);
//Set math model to calculate the PPM concentration and the value of constants
MQ2.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
MQ2.setA(574.25); MQ2.setB(-2.222); // Configurate the ecuation values to get LPG concentration
// Calibration setup
MQ2.setR0(9.659574468);
/*
//If the RL value is different from 10K please assign your RL value with the following method:
MQ2.setRL(10);
*/
/***************************** MQ Init ********************************************/
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ2.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.
/************************************************************************************/
MQ2.serialDebug(true);
}
void loop() {
MQ2.update(); // Update data, the arduino will be read the voltaje in the analog pin
/*
//Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo:
MQ2.setRL(10);
*/
/*
//Rutina de calibracion - Uncomment if you need (setup too and header)
if(calibration_button)
{
float R0 = MQ2.calibrate();
MQ2.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 = MQ2.readSensor("", true); // Return LPG concentration
// Options, uncomment where you need
H2 = MQ2.readSensor("H2"); // Return H2 concentration
LPG = MQ2.readSensor("LPG"); // Return LPG concentration
CO = MQ2.readSensor("CO"); // Return CO concentration
Alcohol = MQ2.readSensor("Alcohol"); // Return Alcohol concentration
Propane = MQ2.readSensor("Propane"); // Return Propane concentration
Serial.println("***************************");
Serial.println("Lectures for MQ-2");
Serial.print("Volt: ");Serial.print(MQ2.getVoltage(false));Serial.println(" V");
Serial.print("R0: ");Serial.print(MQ2.getR0());Serial.println(" Ohm");
Serial.print("H2: ");Serial.print(H2,2);Serial.println(" ppm");
Serial.print("LPG: ");Serial.print(LPG,2);Serial.println(" ppm");
Serial.print("CO: ");Serial.print(CO,2);Serial.println(" ppm");
Serial.print("Alcohol: ");Serial.print(Alcohol,2);Serial.println(" ppm");
Serial.print("Propane: ");Serial.print(Propane,2);Serial.println(" ppm");
Serial.println("***************************");
MQ2.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ2.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ2.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}