/* 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 //Declare Sensor MQUnifiedsensor MQ135(pin, type); void setup() { //init the sensor MQ135.inicializar(); } void loop() { //Read the sensor int read = MQ135.readSensor(); //Print measurements Serial.print("MQ135: "); Serial.print(read); Serial.println(" PPM"); //delay 1s to next measure delay(1000); }