/* MQUnifiedsensor Library - reading an MQ135 Demonstrates the use a MQ135 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 //Definitions #define pin A0 //Analog input 0 of your arduino #define type 135 //MQ135 //#define calibration_button 13 //Pin to calibrate your sensor //Declare Sensor MQUnifiedsensor MQ135(pin, type); //Variables float CO, Alcohol, CO2, Tolueno, NH4, Acetona; void setup() { Serial.begin(9600); //Init serial port //init the sensor /***************************** MQInicializar**************************************** Input: pin, type Output: Remarks: This function create the sensor object. ************************************************************************************/ MQ135.inicializar(); //pinMode(calibration_button, INPUT); } void loop() { MQ135.update(); // Update data, the arduino will be read the voltaje in the analog pin /* //Si el valor de RL es diferente a 10K por favor asigna tu valor de RL con el siguiente metodo: MQ135.setRL(10); */ /* //Rutina de calibracion - Uncomment if you need (setup too and header) if(calibration_button) { float R0 = MQ135.calibrate(); MQ135.setR0(R0): } */ /***************************** 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 //float lecture = MQ135.readSensor("", true); // Return NH4 concentration // Options, uncomment where you need CO = MQ135.readSensor("CO"); // Return CO concentration Alcohol = MQ135.readSensor("Alcohol"); // Return Alcohol concentration CO2 = MQ135.readSensor("CO2"); // Return CO2 concentration Tolueno = MQ135.readSensor("Tolueno"); // Return Tolueno concentration NH4 = MQ135.readSensor("NH4"); // Return NH4 concentration Acetona = MQ135.readSensor("Acetona"); // Return Acetona concentration Serial.println("***************************"); Serial.println("Lectures for MQ-135"); Serial.print("Volt: ");Serial.print(MQ135.getVoltage(false));Serial.println(" V"); Serial.print("R0: ");Serial.print(MQ135.getR0());Serial.println(" Ohm"); Serial.print("CO: ");Serial.print(CO,2);Serial.println(" ppm"); Serial.print("Alcohol: ");Serial.print(Alcohol,2);Serial.println(" ppm"); Serial.print("CO2: ");Serial.print(CO2,2);Serial.println(" ppm"); Serial.print("Tolueno: ");Serial.print(Tolueno,2);Serial.println(" ppm"); Serial.print("NH4: ");Serial.print(NH4,2);Serial.println(" ppm"); Serial.print("Acetona: ");Serial.print(Acetona,2);Serial.println(" ppm"); Serial.println("***************************"); }