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Updated MQ-7

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miguel5612 2020-03-26 13:04:04 -05:00
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examples/MQ-7/MQ-7.ino
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@ -1,9 +1,7 @@
/* /*
MQUnifiedsensor Library - reading an MQ7 MQUnifiedsensor Library - reading an MQ7
Demonstrates the use a MQ7 sensor.
Demonstrates the use a MQ7
sensor.
Library originally added 01 may 2019 Library originally added 01 may 2019
by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
@ -11,6 +9,10 @@
modified 23 May 2019 modified 23 May 2019
by Miguel Califa by Miguel Califa
Updated library usage
modified 26 March 2020
by Miguel Califa
This example code is in the public domain. This example code is in the public domain.
*/ */
@ -19,66 +21,57 @@
#include <MQUnifiedsensor.h> #include <MQUnifiedsensor.h>
//Definitions //Definitions
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino #define pin A0 //Analog input 0 of your arduino
#define type 7 //MQ7 #define type "MQ-7" //MQ7
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor //#define calibration_button 13 //Pin to calibrate your sensor
//Declare Sensor //Declare Sensor
MQUnifiedsensor MQ7(pin, type); MQUnifiedsensor MQ7(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
//Variables
float H2, LPG, CH4, CO, Alcohol;
void setup() { void setup() {
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port Serial.begin(9600); //Init serial port
//init the sensor
/***************************** MQInicializar**************************************** //Set math model to calculate the PPM concentration and the value of constants
Input: pin, type MQ7.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
Output: MQ7.setA(99.042); MQ7.setB(-1.518); // Configurate the ecuation values to get CO concentration
Remarks: This function create the sensor object.
************************************************************************************/ /*
MQ7.inicializar(); Exponential regression:
//pinMode(calibration_button, INPUT); GAS | a | b
H2 | 69.014 | -1.374
LPG | 700000000 | -7.703
CH4 | 60000000000000 | -10.54
CO | 99.042 | -1.518
Alcohol | 40000000000000000 | -12.35
*/
// Calibration setup
MQ7.setR0(4);
/*
//If the RL value is different from 10K please assign your RL value with the following method:
MQ7.setRL(10);
*/
/***************************** MQ Init ********************************************/
//Remarks: Configure the pin of arduino as input.
/************************************************************************************/
MQ7.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.
/************************************************************************************/
MQ7.serialDebug(true);
} }
void loop() { void loop() {
MQ7.update(); // Update data, the arduino will be read the voltaje in the analog pin MQ7.update(); // Update data, the arduino will be read the voltage on the analog pin
/* MQ7.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
//Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo: MQ7.serialDebug(); // Will print the table on the serial port
MQ7.setRL(10); delay(500); //Sampling frequency
*/ }
/*
//Rutina de calibracion - Uncomment if you need (setup too and header)
if(calibration_button)
{
float R0 = MQ7.calibrate();
MQ7.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 = MQ7.readSensor("", true); // Return CH4 concentration
// Options, uncomment where you need
H2 = MQ7.readSensor("H2"); // Return CH4 concentration
LPG = MQ7.readSensor("LPG"); // Return LPG concentration
CH4 = MQ7.readSensor("CH4"); // Return CH4 concentration
CO = MQ7.readSensor("CO"); // Return CO concentration
Alcohol = MQ7.readSensor("Alcohol"); // Return Alcohol concentration
Serial.println("***************************");
Serial.println("Lectures for MQ-7");
Serial.print("Volt: ");Serial.print(MQ7.getVoltage(false));Serial.println(" V");
Serial.print("R0: ");Serial.print(MQ7.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("CH4: ");Serial.print(CH4,2);Serial.println(" ppm");
Serial.print("CO: ");Serial.print(CO,2);Serial.println(" ppm");
Serial.print("Alcohol: ");Serial.print(Alcohol,2);Serial.println(" ppm");
Serial.println("***************************");
}