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https://github.com/miguel5612/MQSensorsLib.git
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Updated examples
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miguel5612
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@ -17,19 +17,39 @@
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#include <MQUnifiedsensor.h>
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//Definitions
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#define placa "Arduino UNO"
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#define Voltage_Resolution 5
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#define pin A0 //Analog input 0 of your arduino
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#define type 2 //MQ2
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#define type "MQ-2" //MQ2
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#define ADC_Bit_Resolution 10 // For arduino UNO/MEGA/NANO
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//Defaults, uncomment if you need
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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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//#define RatioMQ131CleanAir 15 //RS / R0 = 15 ppm
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//#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm
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//#define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm
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//#define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm
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//Declare Sensor
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MQUnifiedsensor MQ2(pin, type);
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MQUnifiedsensor MQ2(placa, Voltage_Resolution, ADC_Bit_Resolution, pin2, type);
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unsigned long contador = 0;
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void setup() {
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//Init serial port
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Serial.begin(115200);
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MQ2.setRegressionMethod("Exponential"); //_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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//init the sensor
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MQ2.inicializar();
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MQ2.init();
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//Print in serial monitor
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Serial.print("MQ2 - Calibracion");
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Serial.print("Note - Make sure you are in a clean room and the sensor has pre-heated almost 4 hours");
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@ -38,7 +58,7 @@ void setup() {
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void loop() {
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//Read the sensor and print in serial port
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int lecture = MQ2.calibrate();
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int lecture = MQ2.calibrate(RatioMQ2CleanAir);
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//Print in serial monitor
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Serial.print(String(contador) + ",");
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Serial.println(lecture);
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@ -35,6 +35,10 @@
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LiquidCrystal_I2C lcd(0x27, 16, 2);
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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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@ -44,17 +48,31 @@ LiquidCrystal_I2C lcd(0x27, 16, 2);
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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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#define RatioMQ131CleanAir 15 //RS / R0 = 15 ppm
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#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm
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#define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm
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#define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm
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#define timeDelay 500
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//Declare Sensor
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MQUnifiedsensor MQ2(pin2, 2);
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MQUnifiedsensor MQ3(pin3, 3);
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MQUnifiedsensor MQ4(pin4, 4);
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MQUnifiedsensor MQ5(pin5, 5);
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MQUnifiedsensor MQ6(pin6, 6);
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MQUnifiedsensor MQ7(pin7, 7);
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MQUnifiedsensor MQ8(pin8, 8);
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MQUnifiedsensor MQ9(pin9, 9);
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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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unsigned long contador = 0;
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unsigned long time = millis();
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@ -74,23 +92,45 @@ void setup() {
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lcd.print(" Calibrating");
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//init the sensor
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MQ2.inicializar();
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MQ3.inicializar();
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MQ4.inicializar();
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MQ5.inicializar();
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MQ6.inicializar();
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MQ7.inicializar();
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MQ8.inicializar();
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MQ9.inicializar();
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MQ2.init();
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MQ2.setRegressionMethod("Exponential"); //_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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MQ2.setVoltResolution(5);
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MQ3.setVoltResolution(5);
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MQ4.setVoltResolution(5);
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MQ5.setVoltResolution(5);
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MQ6.setVoltResolution(5);
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MQ7.setVoltResolution(5);
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MQ8.setVoltResolution(5);
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MQ9.setVoltResolution(5);
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MQ3.init();
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MQ3.setRegressionMethod("Exponential"); //_PPM = a*ratio^b
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MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values to get Benzene concentration
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MQ3.setR0(3.86018237);
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MQ4.init();
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MQ4.setRegressionMethod("Exponential"); //_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("Exponential"); //_PPM = a*ratio^b
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MQ5.setA(1163.8); MQ5.setB(-3.874); // Configurate the ecuation values to get H2 concentration
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MQ5.setR0(71.100304);
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MQ6.init();
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MQ6.setRegressionMethod("Exponential"); //_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("Exponential"); //_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("Exponential"); //_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("Exponential"); //_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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//Print in serial monitor
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Serial.println("MQ2 to MQ9 - Calibracion");
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@ -113,14 +153,14 @@ void loop() {
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MQ9.update();
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//Read the sensor
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float lecture2 = MQ2.calibrate();
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float lecture3 = MQ3.calibrate();
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float lecture4 = MQ4.calibrate();
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float lecture5 = MQ5.calibrate();
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float lecture6 = MQ6.calibrate();
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float lecture7 = MQ7.calibrate();
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float lecture8 = MQ8.calibrate();
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float lecture9 = MQ9.calibrate();
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float lecture2 = MQ2.calibrate(RatioMQ2CleanAir);
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float lecture3 = MQ3.calibrate(RatioMQ3CleanAir);
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float lecture4 = MQ4.calibrate(RatioMQ4CleanAir);
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float lecture5 = MQ5.calibrate(RatioMQ5CleanAir);
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float lecture6 = MQ6.calibrate(RatioMQ6CleanAir);
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float lecture7 = MQ7.calibrate(RatioMQ7CleanAir);
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float lecture8 = MQ8.calibrate(RatioMQ8CleanAir);
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float lecture9 = MQ9.calibrate(RatioMQ9CleanAir);
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//Read voltage the sensor
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float v2 = MQ2.getVoltage(false);
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@ -17,7 +17,7 @@
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#include <MQUnifiedsensor.h>
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//Definitions
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#define placa "Arduino UNO"
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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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@ -29,6 +29,20 @@
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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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#define RatioMQ131CleanAir 15 //RS / R0 = 15 ppm
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#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm
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#define RatioMQ303CleanAir 1 //RS / R0 = 1 ppm
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#define RatioMQ309CleanAir 11 //RS / R0 = 11 ppm
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//#define calibration_button 13 //Pin to calibrate your sensor
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//Declare Sensor
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