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Fixed example calibratioN
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miguel5612
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@ -17,6 +17,10 @@
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modified 28 May 2019
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by Ghiordy contreras, Miguel Califa
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Added voltaje to log
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modified 29 May 2019
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by Miguel Califa
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This example code is in the public domain.
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*/
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@ -44,15 +48,16 @@ LiquidCrystal_I2C lcd(0x27, 16, 2);
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//Declare Sensor
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MQUnifiedsensor MQ2(pin2, 2);
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MQUnifiedsensor MQ3(pin3, 2);
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MQUnifiedsensor MQ4(pin4, 2);
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MQUnifiedsensor MQ5(pin5, 2);
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MQUnifiedsensor MQ6(pin6, 2);
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MQUnifiedsensor MQ7(pin7, 2);
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MQUnifiedsensor MQ8(pin8, 2);
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MQUnifiedsensor MQ9(pin9, 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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unsigned long contador = 0;
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unsigned long time = millis();
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void setup() {
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//Init serial port
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@ -66,7 +71,7 @@ void setup() {
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lcd.setCursor(0,0);
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lcd.print("MQ2 to MQ9");
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lcd.setCursor(0,1);
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lcd.print(" Calibracion");
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lcd.print(" Calibrating");
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//init the sensor
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MQ2.inicializar();
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@ -77,11 +82,20 @@ void setup() {
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MQ7.inicializar();
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MQ8.inicializar();
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MQ9.inicializar();
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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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//Print in serial monitor
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Serial.println("MQ2 to MQ9 - Calibracion");
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Serial.println("Note - Make sure you are in a clean room and the sensor has pre-heated almost 4 hours");
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Serial.println("Autonumeric, MQ2(PPM), MQ3(PPM), MQ4(PPM), MQ5(PPM), MQ6(PPM), MQ7(PPM)");
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Serial.println("Autonumeric, MQ2(R0), MQ3(R0), MQ4(R0), MQ5(R0), MQ6(R0), MQ7(R0)");
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//Wait one second to continue
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delay(timeDelay/10);
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}
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@ -96,6 +110,7 @@ void loop() {
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int lecture7 = MQ7.calibrate();
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int lecture8 = MQ8.calibrate();
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int lecture9 = MQ9.calibrate();
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//Print in serial monitor
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char out[40];
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@ -105,47 +120,11 @@ void loop() {
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//Print in LCD
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print("MQ2: ");
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lcd.print(lecture2);
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lcd.print(" PPM");
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lcd.print("**CALIBRATING***");
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lcd.setCursor(0,1);
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lcd.print("MQ3: ");
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lcd.print(lecture3);
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lcd.print(" PPM");
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delay(timeDelay/4);
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print("MQ4: ");
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lcd.print(lecture4);
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lcd.print(" PPM");
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lcd.setCursor(0,1);
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lcd.print("MQ5: ");
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lcd.print(lecture5);
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lcd.print(" PPM");
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delay(timeDelay/4);
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print("MQ6: ");
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lcd.print(lecture6);
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lcd.print(" PPM");
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lcd.setCursor(0,1);
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lcd.print("MQ7: ");
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lcd.print(lecture7);
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lcd.print(" PPM");
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delay(timeDelay/4);
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lcd.clear();
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lcd.setCursor(0,0);
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lcd.print("MQ8: ");
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lcd.print(lecture2);
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lcd.print(" PPM");
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lcd.setCursor(0,1);
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lcd.print("MQ8: ");
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lcd.print(lecture8);
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lcd.print(" PPM");
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delay(timeDelay/4);
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lcd.print("Time: " + String((millis() - time)/60000) + "min");
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//Increment counter
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contador++;
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//Wait to measure next sample
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delay(timeDelay/4);
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}
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}
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@ -92,7 +92,7 @@
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}
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void MQUnifiedsensor::setVoltResolution(float voltaje)
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{
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VOLT_RESOLUTION = voltaje;
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_VOLT_RESOLUTION = voltaje;
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}
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void MQUnifiedsensor::inicializar()
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{
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@ -125,8 +125,6 @@ void MQUnifiedsensor::setSensorCharacteristics(String nameLectureRequeired, bool
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{
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//Set default
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setDefaultGas();
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//Set ratio in clean air to calc R0
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setRatioInCleanAir();
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//Put the default into variable internally used
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nameLectureRequeired = _nameLectureRequeired;
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}
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@ -151,7 +149,7 @@ int MQUnifiedsensor::readPPM(int m, int b) {
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_sensor_volt = this->getVoltage();
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double RS_gas; //Define variable for sensor resistance
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RS_gas = ((VOLT_RESOLUTION*RLValue)/_sensor_volt)-RLValue; //Get value of RS in a gas
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RS_gas = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Get value of RS in a gas
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_ratio = RS_gas / this->_R0; // Get ratio RS_gas/RS_air
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@ -177,7 +175,7 @@ int MQUnifiedsensor::calibrate() {
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float R0; //Define variable for R0
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float sensorValue; //Define variable for analog readings
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_sensor_volt = this->getVoltage(); //Convert average to voltage
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RS_air = ((VOLT_RESOLUTION*RLValue)/_sensor_volt)-RLValue; //Calculate RS in fresh air
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RS_air = ((_VOLT_RESOLUTION*_RLValue)/_sensor_volt)-_RLValue; //Calculate RS in fresh air
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R0 = RS_air/_ratioInCleanAir; //Calculate R0
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return R0;
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}
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@ -188,7 +186,7 @@ double MQUnifiedsensor::getVoltage() {
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delay(retry_interval);
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}
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double voltage = avg * VOLT_RESOLUTION / (pow(2, ADC_RESOLUTION) - 1);
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double voltage = avg * _VOLT_RESOLUTION / (pow(2, ADC_RESOLUTION) - 1);
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return voltage;
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}
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@ -8,14 +8,6 @@
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//Count of posible lectures
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#define lecturesAvailable 19
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/************************Global vars************************************/
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int VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3
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int RLValue = 10; //Value in KiloOhms
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int _ratioInCleanAir, _PPM, _sensor_volt;
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double RS_air, _m, _b, _ratio;
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/************************Hardware Related Macros************************************/
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//Index in the nameLecture vector
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#define defaultMQ2 "LPG" // LPG
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#define defaultMQ3 "Alcohol" // Alcohol
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@ -68,18 +60,18 @@ double RS_air, _m, _b, _ratio;
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/**********************Application Related Macros**********************************/
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/* Gas, Value of m (Slope) and b (Cut on x axis) points */
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//Values consolidated
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const String PROGMEM _MQ2[18] = {"H2","-2.2459","2.9845","LPG","-2.2879","2.7901","CO","-2.6208","3.6075","Alcohol","-3.1157","4.5134","Propane","-2.7028","3.5595","Benzene","-2.2879","2.7901"};
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const String PROGMEM _MQ3[18] = {"LPG","-3.1851","4.7048","CH4","-17.531","28.785","CO","-4.339","6.4432","Alcohol","-1.435","0.4103","Benzene","-2.7009","0.632","Hexane","-2.7268","3.6299"};
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const String PROGMEM _MQ4[15] = {"LPG","-2.5818","3.6303","CH4","0.9873","2.6386","CO","-5.5945","5.6693","Alcohol","-11.89","9.0375","smoke","-11.189","9.0375"};
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const String PROGMEM _MQ5[15] = {"H2","-4.368","2.9667","LPG","-2.5723","1.8943","CH4","-2.4438","2.3044","CO","-4.8188","5.2023","Alcohol","-4.419","4.8044"};
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const String PROGMEM _MQ6[15] = {"H2","-3.6775","5.0286","LPG","-1.6567","2.8775","CH4","-1","3.301","CO","-12.791","14.523","Alcohol","-5.8057","7.5292"};
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const String PROGMEM _MQ7[15] = {"H2","-1.329","1.8864","LPG","-7.8626","9.1056","CH4","-5.4878","8.8387","CO","-1.4065","2.0162","Alcohol","-6.3219","9.924"};
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const String PROGMEM _MQ8[15] = {"H2","-0.7152","2.9891","LPG","-3.419","7.3513","CH4","-7.5609","15.243","CO","-7.0753","15.396","Alcohol","-1.7459","4.7575"};
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const String PROGMEM _MQ9[9] = {"LPG","-2.2535","2.9855","CH4","-1.6012","3.1476","CO","-1.749","2.827"};
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const String PROGMEM _MQ131[9] = {"Nox","-2.7245","3.3004","CL2","-1.0333","1.7117","O3","-1.2037","1.6455"};
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const String PROGMEM _MQ135[18] = {"CO","-2.7268","2.301","Alcohol","-2.8608","1.8627","CO2","-3.2819","1.9903","Tolueno","-5.7015","1.1612","NH4","-2.2119","2.0473","Acetona","-5.9682","1.0175"};
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const String PROGMEM _MQ303A[9] = {"Iso-butano","-2.3543","1.144","Hydrogeno","-2.4338","0.7558","Ethanol","-2.5597","0.4436"};
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const String PROGMEM _MQ309A[12] = {"H2","-2.1311","3.0886","CH4","-1.6554","2.985","CO","-4.7623","6.7413","Alcohol","-3.7686","5.6744"};
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const String _MQ2[18] = {"H2","-2.2459","2.9845","LPG","-2.2879","2.7901","CO","-2.6208","3.6075","Alcohol","-3.1157","4.5134","Propane","-2.7028","3.5595","Benzene","-2.2879","2.7901"};
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const String _MQ3[18] = {"LPG","-3.1851","4.7048","CH4","-17.531","28.785","CO","-4.339","6.4432","Alcohol","-1.435","0.4103","Benzene","-2.7009","0.632","Hexane","-2.7268","3.6299"};
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const String _MQ4[15] = {"LPG","-2.5818","3.6303","CH4","0.9873","2.6386","CO","-5.5945","5.6693","Alcohol","-11.89","9.0375","smoke","-11.189","9.0375"};
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const String _MQ5[15] = {"H2","-4.368","2.9667","LPG","-2.5723","1.8943","CH4","-2.4438","2.3044","CO","-4.8188","5.2023","Alcohol","-4.419","4.8044"};
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const String _MQ6[15] = {"H2","-3.6775","5.0286","LPG","-1.6567","2.8775","CH4","-1","3.301","CO","-12.791","14.523","Alcohol","-5.8057","7.5292"};
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const String _MQ7[15] = {"H2","-1.329","1.8864","LPG","-7.8626","9.1056","CH4","-5.4878","8.8387","CO","-1.4065","2.0162","Alcohol","-6.3219","9.924"};
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const String _MQ8[15] = {"H2","-0.7152","2.9891","LPG","-3.419","7.3513","CH4","-7.5609","15.243","CO","-7.0753","15.396","Alcohol","-1.7459","4.7575"};
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const String _MQ9[9] = {"LPG","-2.2535","2.9855","CH4","-1.6012","3.1476","CO","-1.749","2.827"};
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const String _MQ131[9] = {"Nox","-2.7245","3.3004","CL2","-1.0333","1.7117","O3","-1.2037","1.6455"};
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const String _MQ135[18] = {"CO","-2.7268","2.301","Alcohol","-2.8608","1.8627","CO2","-3.2819","1.9903","Tolueno","-5.7015","1.1612","NH4","-2.2119","2.0473","Acetona","-5.9682","1.0175"};
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const String _MQ303A[9] = {"Iso-butano","-2.3543","1.144","Hydrogeno","-2.4338","0.7558","Ethanol","-2.5597","0.4436"};
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const String _MQ309A[12] = {"H2","-2.1311","3.0886","CH4","-1.6554","2.985","CO","-4.7623","6.7413","Alcohol","-3.7686","5.6744"};
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class MQUnifiedsensor
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{
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@ -103,8 +95,14 @@ class MQUnifiedsensor
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private:
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int _pin, _type, _R0;
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/************************Private vars************************************/
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int _pin, _type, _R0, _lecturePosInArray;
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String _MQ[19], _nameLectureRequeired;
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int _VOLT_RESOLUTION = 5.0; // if 3.3v use 3.3
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int _RLValue = 10; //Value in KiloOhms
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int _ratioInCleanAir, _PPM, _sensor_volt;
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float RS_air, _m, _b, _ratio;
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};
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#endif //MQUnifiedsensor_H
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