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Updated MQ131 to MQ309

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miguel5612
2020-03-26 13:20:05 -05:00
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examples/MQ-303A/MQ303.ino
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/*
MQUnifiedsensor Library - reading an MQ4
MQUnifiedsensor Library - reading an MQ303
Demonstrates the use a MQ303 sensor.
Library originally added 01 may 2019
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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.
*/
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#include <MQUnifiedsensor.h>
//Definitions
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino
#define type 303 //MQ303
#define type "MQ-303" //MQ303
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor
MQUnifiedsensor MQ303(pin, type);
//Variables
float Iso_butano, Hydrogeno, Ethanol;
MQUnifiedsensor MQ303(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
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.
************************************************************************************/
MQ303.inicializar();
//pinMode(calibration_button, INPUT);
//Set math model to calculate the PPM concentration and the value of constants
MQ303.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
MQ303.setA(6.2144); MQ303.setB(-2.894); // Configurate the ecuation values to get Isobutano concentration
/*
Exponential regression:
GAS | a | b
Iso_butano | 6.2144 | -2.894
Hydrogen | 4.1487 | -2.716
Ethanol | 3.4916 | -2.432
*/
// Calibration setup
MQ303.setR0(10);
/*
//If the RL value is different from 10K please assign your RL value with the following method:
MQ303.setRL(10);
*/
/***************************** MQ Init ********************************************/
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ303.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.
/************************************************************************************/
MQ303.serialDebug(true);
}
void loop() {
MQ303.update();
/*
//Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo:
MQ303.setRL(10);
*/
/*
//Rutina de calibracion - Uncomment if you need (setup too and header)
if(calibration_button)
{
float R0 = MQ303.calibrate();
MQ303.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 = MQ303.readSensor("", true); // Return Isobutano concentration
// Options, uncomment where you need
Iso_butano = MQ303.readSensor("Iso_butano"); // Return Iso_butano concentration
Hydrogeno = MQ303.readSensor("Hydrogeno"); // Return Hydrogeno concentration
Ethanol = MQ303.readSensor("Ethanol"); // Return Ethanol concentration
Serial.println("***************************");
Serial.println("Lectures for MQ-303");
Serial.print("Volt: ");Serial.print(MQ303.getVoltage(false));Serial.println(" V");
Serial.print("R0: ");Serial.print(MQ303.getR0());Serial.println(" Ohm");
Serial.print("Iso_butano: ");Serial.print(Iso_butano,2);Serial.println(" ppm");
Serial.print("Hydrogeno: ");Serial.print(Hydrogeno,2);Serial.println(" ppm");
Serial.print("Ethanol: ");Serial.print(Ethanol,2);Serial.println(" ppm");
Serial.println("***************************");
}
MQ303.update(); // Update data, the arduino will be read the voltage on the analog pin
MQ303.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
MQ303.serialDebug(); // Will print the table on the serial port
delay(500); //Sampling frequency
}