mirror of
https://github.com/miguel5612/MQSensorsLib.git
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222 lines
8.3 KiB
C++
222 lines
8.3 KiB
C++
/*
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MQUnifiedsensor Library - calibrating an MQ2 to MQ9
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Demonstrates the use a MQ2 sensor.
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Library originally added 01 may 2019
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by Miguel A Califa, Yersson Carrillo, Ghiordy Contreras, Mario Rodriguez
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Added example
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modified 27 May 2019
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by Miguel Califa
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Wiring:
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https://github.com/miguel5612/MQSensorsLib_Docs/blob/master/static/img/MQ_Arduino.PNG
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Please take care, arduino A0 pin represent the analog input configured on #define pin
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This example code is in the public domain.
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*/
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//Include the library
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#include <MQUnifiedsensor.h>
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//Definitions
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#define placa "Arduino Mega 2560"
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#define Voltage_Resolution 5
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#define type "MQ-Board"
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#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
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#define pin2 A2 //Analog input 2 of your arduino
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#define pin3 A3 //Analog input 3 of your arduino
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#define pin4 A4 //Analog input 4 of your arduino
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#define pin5 A5 //Analog input 5 of your arduino
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#define pin6 A6 //Analog input 6 of your arduino
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#define pin7 A7 //Analog input 7 of your arduino
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#define pin8 A8 //Analog input 8 of your arduino
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#define pin9 A9 //Analog input 9 of your arduino
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#define RatioMQ2CleanAir 9.83 //RS / R0 = 9.83 ppm
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#define RatioMQ3CleanAir 60 //RS / R0 = 60 ppm
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#define RatioMQ4CleanAir 4.4 //RS / R0 = 4.4 ppm
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#define RatioMQ5CleanAir 6.5 //RS / R0 = 6.5 ppm
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#define RatioMQ6CleanAir 10 //RS / R0 = 10 ppm
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#define RatioMQ7CleanAir 27.5 //RS / R0 = 27.5 ppm
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#define RatioMQ8CleanAir 70 //RS / R0 = 70 ppm
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#define RatioMQ9CleanAir 9.6 //RS / R0 = 9.6 ppm
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//Declare Sensor
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MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin2, type);
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MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin3, type);
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MQUnifiedsensor MQ4(placa, Voltage_Resolution, ADC_Bit_Resolution, pin4, type);
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MQUnifiedsensor MQ5(placa, Voltage_Resolution, ADC_Bit_Resolution, pin5, type);
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MQUnifiedsensor MQ6(placa, Voltage_Resolution, ADC_Bit_Resolution, pin6, type);
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MQUnifiedsensor MQ7(placa, Voltage_Resolution, ADC_Bit_Resolution, pin7, type);
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MQUnifiedsensor MQ8(placa, Voltage_Resolution, ADC_Bit_Resolution, pin8, type);
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MQUnifiedsensor MQ9(placa, Voltage_Resolution, ADC_Bit_Resolution, pin9, type);
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void setup() {
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//Init serial port
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Serial.begin(9600);
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//init the sensor
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MQ2.init();
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MQ2.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ2.setA(574.25); MQ2.setB(-2.222); // Configurate the ecuation values to get LPG concentration
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MQ2.setR0(9.659574468);
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MQ3.init();
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MQ3.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ3.setA(0.3934); MQ3.setB(-1.504); // Configurate the ecuation values to get Alcohol concentration
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MQ3.setR0(3.86018237);
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MQ4.init();
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MQ4.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ4.setA(1012.7); MQ4.setB(-2.786); // Configurate the ecuation values to get CH4 concentration
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MQ4.setR0(3.86018237);
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MQ5.init();
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MQ5.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ5.setA(97124); MQ5.setB(-4.918); // Configurate the ecuation values to get Alcohol concentration
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MQ5.setR0(71.100304);
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MQ6.init();
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MQ6.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ6.setA(2127.2); MQ6.setB(-2.526); // Configurate the ecuation values to get CH4 concentration
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MQ6.setR0(13.4285714);
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MQ7.init();
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MQ7.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ7.setA(99.042); MQ7.setB(-1.518); // Configurate the ecuation values to get CO concentration
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MQ7.setR0(4);
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MQ8.init();
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MQ8.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ8.setA(976.97); MQ8.setB(-0.688); // Configurate the ecuation values to get H2 concentration
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MQ8.setR0(1);
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MQ9.init();
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MQ9.setRegressionMethod(1); //_PPM = a*ratio^b
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MQ9.setA(1000.5); MQ9.setB(-2.186); // Configurate the ecuation values to get LPG concentration
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MQ9.setR0(9.42857143);
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/***************************** MQ CAlibration ********************************************/
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// Explanation:
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// In this routine the sensor will measure the resistance of the sensor supposing before was pre-heated
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// and now is on clean air (Calibration conditions), and it will setup R0 value.
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// We recomend execute this routine only on setup or on the laboratory and save on the eeprom of your arduino
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// This routine not need to execute to every restart, you can load your R0 if you know the value
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// Acknowledgements: https://jayconsystems.com/blog/understanding-a-gas-sensor
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Serial.print("Calibrating please wait.");
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float MQ2calcR0 = 0,
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MQ3calcR0 = 0,
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MQ4calcR0 = 0,
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MQ5calcR0 = 0,
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MQ6calcR0 = 0,
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MQ7calcR0 = 0,
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MQ8calcR0 = 0,
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MQ9calcR0 = 0;
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for(int i = 1; i<=10; i ++)
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{
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//Update the voltage lectures
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MQ2.update();
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MQ3.update();
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MQ4.update();
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MQ5.update();
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MQ6.update();
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MQ7.update();
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MQ8.update();
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MQ9.update();
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MQ2calcR0 += MQ2.calibrate(RatioMQ2CleanAir);
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MQ3calcR0 += MQ2.calibrate(RatioMQ3CleanAir);
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MQ4calcR0 += MQ2.calibrate(RatioMQ4CleanAir);
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MQ5calcR0 += MQ2.calibrate(RatioMQ5CleanAir);
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MQ6calcR0 += MQ2.calibrate(RatioMQ6CleanAir);
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MQ7calcR0 += MQ2.calibrate(RatioMQ7CleanAir);
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MQ8calcR0 += MQ2.calibrate(RatioMQ8CleanAir);
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MQ9calcR0 += MQ2.calibrate(RatioMQ9CleanAir);
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Serial.print(".");
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}
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MQ2.setR0(MQ2calcR0/20);
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MQ3.setR0(MQ3calcR0/20);
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MQ4.setR0(MQ4calcR0/20);
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MQ5.setR0(MQ5calcR0/20);
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MQ6.setR0(MQ6calcR0/20);
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MQ7.setR0(MQ7calcR0/20);
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MQ8.setR0(MQ8calcR0/20);
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MQ9.setR0(MQ9calcR0/20);
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Serial.println(" done!.");
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Serial.print("Valores de R0 para cada sensor (MQ2 - MQ9):");
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Serial.print(MQ2calcR0/10); Serial.print(" | ");
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Serial.print(MQ3calcR0/10); Serial.print(" | ");
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Serial.print(MQ4calcR0/10); Serial.print(" | ");
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Serial.print(MQ5calcR0/10); Serial.print(" | ");
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Serial.print(MQ6calcR0/10); Serial.print(" | ");
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Serial.print(MQ7calcR0/10); Serial.print(" | ");
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Serial.print(MQ8calcR0/10); Serial.print(" | ");
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Serial.print(MQ9calcR0/10); Serial.println(" |");
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if(isinf(MQ2calcR0) || isinf(MQ3calcR0) || isinf(MQ4calcR0) || isinf(MQ5calcR0) || isinf(MQ6calcR0) || isinf(MQ7calcR0) || isinf(MQ8calcR0) || isinf(MQ9calcR0)) {Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply"); while(1);}
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if(MQ2calcR0 == 0 || MQ3calcR0 == 0 || MQ4calcR0 == 0 || MQ5calcR0 == 0 || MQ6calcR0 == 0 || MQ7calcR0 == 0 || MQ8calcR0 == 0 || MQ9calcR0 == 0){Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply"); while(1);}
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/***************************** MQ CAlibration ********************************************/
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//Print in serial monitor
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Serial.println("MQ2 to MQ9 - lecture");
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Serial.println("*************************** Lectures from MQ-board ***************************");
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Serial.println("| LPG | Alcohol | CH4 | Alcohol | CH4 | CO | H2 | LPG |");
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Serial.println("| MQ-2 | MQ-3 | MQ-4 | MQ-5 | MQ-6 | MQ-7 | MQ-8 | MQ-9 |");
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//pinMode(calibration_button, INPUT);
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}
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void loop() {
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//Update the voltage lectures
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MQ2.update();
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MQ3.update();
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MQ4.update();
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MQ5.update();
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MQ6.update();
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MQ7.update();
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MQ8.update();
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MQ9.update();
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/*
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//Rutina de calibracion - Uncomment if you need (setup too and header)
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if(calibration_button)
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{
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float R0 = MQ2.calibrate();
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MQ2.setR0(R0):
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R0 = MQ3.calibrate();
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MQ3.setR0(R0):
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R0 = MQ4.calibrate();
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MQ4.setR0(R0):
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R0 = MQ5.calibrate();
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MQ5.setR0(R0):
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R0 = MQ6.calibrate();
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MQ6.setR0(R0):
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R0 = MQ7.calibrate();
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MQ7.setR0(R0):
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R0 = MQ8.calibrate();
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MQ8.setR0(R0):
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R0 = MQ9.calibrate();
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MQ9.setR0(R0):
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}
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*/
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//Read the sensor and print in serial port
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float MQ2Lecture = MQ2.readSensor();
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float MQ3Lecture = MQ3.readSensor();
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float MQ4Lecture = MQ4.readSensor();
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float MQ5Lecture = MQ5.readSensor();
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float MQ6Lecture = MQ6.readSensor();
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float MQ7Lecture = MQ7.readSensor();
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float MQ8Lecture = MQ8.readSensor();
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float MQ9Lecture = MQ9.readSensor();
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Serial.print("| "); Serial.print(MQ2Lecture);
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Serial.print(" | "); Serial.print(MQ3Lecture);
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Serial.print(" | "); Serial.print(MQ4Lecture);
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Serial.print(" | "); Serial.print(MQ5Lecture);
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Serial.print(" | "); Serial.print(MQ6Lecture);
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Serial.print(" | "); Serial.print(MQ7Lecture);
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Serial.print(" | "); Serial.print(MQ8Lecture);
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Serial.print(" | "); Serial.print(MQ9Lecture);
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Serial.println("|");
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} |