mirror of
https://github.com/miguel5612/MQSensorsLib.git
synced 2025-03-29 20:20:01 +03:00
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
/*
|
|
MQUnifiedsensor Library - smokeDetector
|
|
|
|
Demonstrates the use a MQ2 sensor.
|
|
Library originally added 01 may 2019
|
|
by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
|
|
|
|
Added example
|
|
modified 23 May 2019
|
|
by Miguel Califa
|
|
|
|
This example code is in the public domain.
|
|
|
|
*/
|
|
|
|
//Include the library
|
|
#include <MQUnifiedsensor.h>
|
|
|
|
//Definitions
|
|
#define placa "Arduino UNO"
|
|
#define Voltage_Resolution 5
|
|
#define pin A0 //Analog input 0 of your arduino
|
|
#define type "MQ-4" //MQ4
|
|
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
|
|
//#define calibration_button 13 //Pin to calibrate your sensor
|
|
|
|
//Declare Sensor
|
|
MQUnifiedsensor MQ4(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
|
|
|
|
void setup() {
|
|
//Init serial port
|
|
Serial.begin(115200);
|
|
//Set math model to calculate the PPM concentration and the value of constants
|
|
MQ4.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
|
|
MQ4.setA(30000000); MQ4.setB(-2.786); // Configurate the ecuation values to get CH4 concentration
|
|
/*
|
|
Exponential regression:
|
|
Gas | a | b
|
|
LPG | 3811.9 | -3.113
|
|
CH4 | 1012.7 | -2.786
|
|
CO | 200000000000000 | -19.05
|
|
Alcohol| 60000000000 | -14.01
|
|
smoke | 30000000 | -8.308
|
|
*/
|
|
/***************************** MQ Init ********************************************/
|
|
//Remarks: Configure the pin of arduino as input.
|
|
/************************************************************************************/
|
|
MQ4.init();
|
|
|
|
// Calibration setup
|
|
MQ4.setR0(3.86018237);
|
|
|
|
/*
|
|
//If the RL value is different from 10K please assign your RL value with the following method:
|
|
MQ4.setRL(10);
|
|
*/
|
|
}
|
|
|
|
void loop() {
|
|
/***************************** 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
|
|
int lecture = MQ4.readSensor(); // Return smoke concentration
|
|
Serial.print("MQ4 smoke ppm lecture: ");
|
|
Serial.print(lecture);
|
|
Serial.println(" ppm");
|
|
delay(400);
|
|
}
|