/* MQUnifiedsensor Library - reading an MQ2 Demonstrates the use a MQ2 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 2 //MQ2 //Declare Sensor MQUnifiedsensor MQ2(pin, type); void setup() { //Init serial port Serial.begin(115200); /***************************** MQInicializar**************************************** Input: Output: Remarks: This function configure the pinMode ************************************************************************************/ //init the sensor MQ2.inicializar(); } 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 = MQ2.readSensor("", true); // Return LPG concentration // Options, uncomment where you need //int lecture = MQ2.readSensor("H2", true); // Return H2 concentration //int lecture = MQ2.readSensor("LPG", true); // Return LPG concentration //int lecture = MQ2.readSensor("CO", true); // Return CO concentration //int lecture = MQ2.readSensor("Alcohol", true); // Return Alcohol concentration //int lecture = MQ2.readSensor("Propane", true); // Return Propane concentration //int lecture = MQ2.readSensor("Benzene", true); // Return Benzene concentration delay(400); }