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Updated alcohol on PPM

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miguel5612 2020-03-26 14:17:28 -05:00
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examples/Alcoholimeter/Alcoholimeter.ino
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/*
MQUnifiedsensor Library - implementing an alcoholimeter
MQUnifiedsensor Library - reading an MQ3
Demonstrates the use a MQ3 sensor.
Library originally added 01 may 2019
@ -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.
*/
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#include <MQUnifiedsensor.h>
//Definitions
#define pin A3 //Analog input 0 of your arduino
#define type 3 //MQ3
#define placa "Arduino UNO"
#define Voltage_Resolution 5
#define pin A0 //Analog input 0 of your arduino
#define type "MQ-3" //MQ3
#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
//#define calibration_button 13 //Pin to calibrate your sensor
double alcoholPPM = 0;
//Declare Sensor
MQUnifiedsensor MQ3(pin, type);
MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
void setup() {
Serial.begin(9600);
//init the sensor
/***************************** MQInicializar****************************************
Input: pin, type
Output:
Remarks: This function create the sensor object.
************************************************************************************/
MQ3.inicializar();
//Init the serial port communication - to debug the library
Serial.begin(9600); //Init serial port
float RoCleanAir = MQ3.calibrate();
//Set math model to calculate the PPM concentration and the value of constants
MQ3.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
MQ3.setA(0.3934); MQ3.setB(-1.504); // Configurate the ecuation values to get Alcohol concentration
/*
Exponential regression:
Gas | a | b
LPG | 44771 | -3.245
CH4 | 2*10^31| 19.01
CO | 521853 | -3.821
Alcohol| 0.3934 | -1.504
Benzene| 4.8387 | -2.68
Hexane | 7585.3 | -2.849
*/
Serial.print("R0 preconfigurado: ");
Serial.println(MQ3.getR0());
Serial.print("R0 clean air: ");
Serial.println(RoCleanAir);
//MQ3.setR0(RoCleanAir);
// Calibration setup
MQ3.setR0(3.86018237);
/*
//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();
}
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 = MQ3.readSensor("", true); // Return Alcohol concentration
/*
int gL = lecture/1000;
Serial.print("Alcohol ppm measured: ");
Serial.print(lecture);
Serial.println("ppm");
Serial.print("Alcohol gL measured: ");
Serial.print(gL);
Serial.println("g/L");
*/
MQ3.update(); // Update data, the arduino will be read the voltage on the analog pin
alcoholPPM = MQ3.readSensor(); // Sensor will read PPM concentration using the model and a and b values setted before or in the setup
Serial.print("Alcohol now (PPM): ");
Serial.println(alcoholPPM);
delay(500); //Sampling frequency
}