diff --git a/src/MQUnifiedsensor.cpp b/src/MQUnifiedsensor.cpp
index d097822..162556a 100644
--- a/src/MQUnifiedsensor.cpp
+++ b/src/MQUnifiedsensor.cpp
@@ -1,93 +1,48 @@
 #include "MQUnifiedsensor.h"
 
- MQUnifiedsensor::MQUnifiedsensor(int pin, int type) {
-
+MQUnifiedsensor::MQUnifiedsensor(String Placa, int Voltage_Resolution, int pin, String type) {
   this->_pin = pin;
-  this->_type = type; //2,3,4,5,6,7,8,9,131,135,303,309
-  //Set _MQ variable with MQ sensor selected
-  if(_type == 2)
+  this->_type = type; //MQ-2, MQ-3 ... MQ-309A
+  this->_placa = Placa;
+  this-> _VOLT_RESOLUTION = Voltage_Resolution;
+}
+MQUnifiedsensor::serialDebug(boolean onSetup)
+{
+  if(onSetup)
   {
-    //memcpy(_MQ, _MQ2, sizeof(_MQ2));
-    _ratioInCleanAir = RatioMQ2CleanAir;
-    _R0 = R0_MQ2;
-    //_MQ = MQ2;
+    Serial.println("************************************************************************************************************************************************");
+    Serial.println("MQ sensor reading library for arduino");
+
+    Serial.println("Note: remember that all the parameters below can be modified during the program execution with the methods:");
+    Serial.println("setR0, setRL, setA, setB where you will have to send as parameter the new value, example: mySensor.setR0(20); //R0 = 20K");
+
+    Serial.println("Authors: Miguel A. Califa U - Yersson R. Carrillo A - Ghiordy F. Contreras C");
+    Serial.println("Contributors: Andres A. Martinez - Juan A. Rodríguez - Mario A. Rodríguez O ");
+
+    Serial.println("Sensor:" + _type);
+    Serial.println("Supply voltage:" + _VOLT_RESOLUTION);
+    Serial.println("R0: " + _R0);
+    Serial.println("RL: " + _RL);
+
+    Serial.println("Model: Logarithmic regression with parameters.");
+    Serial.println(_type + ":" + "a:" + _a + " | b:" + _b);
+
+    Serial.println("Development board: " + _placa);
   }
-  else if(_type == 3)
+  else 
   {
-    //memcpy(_MQ, _MQ3, sizeof(_MQ3));
-    _ratioInCleanAir = RatioMQ3CleanAir;
-    _R0 = R0_MQ3;
-    //_MQ = MQ3;
-  }
-  else if(_type == 4)
-  {
-    //memcpy(_MQ, _MQ4, sizeof(_MQ4));
-    _ratioInCleanAir = RatioMQ4CleanAir;
-    _R0 = R0_MQ4;
-    //_MQ = MQ4;
-  }
-  else if(_type == 5)
-  {
-    //memcpy(_MQ, _MQ5, sizeof(_MQ5));
-    _ratioInCleanAir = RatioMQ5CleanAir;
-    _R0 = R0_MQ5;
-    //_MQ = MQ5;
-  }
-  else if(_type == 6)
-  {
-    //memcpy(_MQ, _MQ6, sizeof(_MQ6));
-    _ratioInCleanAir = RatioMQ6CleanAir;
-    _R0 = R0_MQ6;
-    //_MQ = MQ6;
-  }
-  else if(_type == 7)
-  {
-    //memcpy(_MQ, _MQ7, sizeof(_MQ7));
-    _ratioInCleanAir = RatioMQ7CleanAir;
-    _R0 = R0_MQ7;
-    //_MQ = MQ7;
-  }
-  else if(_type == 8)
-  {
-    //memcpy(_MQ, _MQ8, sizeof(_MQ8));
-    _ratioInCleanAir = RatioMQ8CleanAir;
-    _R0 = R0_MQ8;
-    //_MQ = MQ8;
-  }
-  else if(_type == 9)
-  {
-    //memcpy(_MQ, _MQ9, sizeof(_MQ9));
-    _ratioInCleanAir = RatioMQ9CleanAir;
-    _R0 = R0_MQ9;
-    //_MQ = MQ9;
-  }
-  else if(_type == 131)
-  {
-    //memcpy(_MQ, _MQ131, sizeof(_MQ131));
-    _ratioInCleanAir = RatioMQ131CleanAir;
-    _R0 = R0_MQ131;
-    //_MQ = MQ131;
-  }
-  else if(_type == 135)
-  {
-    //memcpy(_MQ, _MQ135, sizeof(_MQ135));
-    _ratioInCleanAir = RatioMQ135CleanAir;
-    _R0 = R0_MQ135;
-    //_MQ = MQ135;
-  }
-  else if(_type == 303)
-  {
-    //memcpy(_MQ, _MQ303A, sizeof(_MQ303A));
-    _ratioInCleanAir = RatioMQ303CleanAir;
-    _R0 = R0_MQ303;
-    //_MQ = MQ303A;
-  }
-  else if(_type == 309)
-  {
-    //memcpy(_MQ, _MQ309A, sizeof(_MQ309A));
-    _ratioInCleanAir = RatioMQ309CleanAir;
-    _R0 = R0_MQ309;
-    //_MQ = MQ309;
+    if(!_firstFlag)
+    {
+      Serial.println("| ****************************************************************" + _type + "****************************************************************|");
+      Serial.println("|ADC_In | Equation_V_ADC | Voltage_ADC |        Equation_R         | Resistance_RS  |    EQ_Ratio  | Ratio (RS/R0) | Equation_PPM |     PPM    |");
+      _firstFlag = true;  //Headers are printed
+    }
+    else
+    {
+      String eq = "";
+      if(regression == "Exponential") eq = "a*ratio^b"
+      Serial.println("|" + _adc + "|" + "v = ADC*" + _VOLT_RESOLUTION + "/1024" + "|" + _sensor_volt + "|" + "RS = ((" + _VOLT_RESOLUTION + "*RL)/Voltage) - RL" + "|" + _RS_Calc + "|" + "Ratio = RS/R0" + "|" + _ratio + "|" + eq + "|" + _PPM);
+    }
   }
 }
 void MQUnifiedsensor::update()
@@ -131,385 +86,6 @@ String MQUnifiedsensor::getnameLecture()
 {
   return _nameLectureRequeired;
 }
-void MQUnifiedsensor::setSensorCharacteristics(String nameLectureRequeired, bool print)
-{
-  //Defaults index
-  if(nameLectureRequeired == "")
-  {
-    //Set default
-    setDefaultGas();
-    //Put  the default into variable internally used
-    nameLectureRequeired = _nameLectureRequeired;
-  }
-
-  if(_type == 2)
-    {
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ2_H2_a;
-        _b = MQ2_H2_b;
-      }
-      else if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ2_LPG_a;
-        _b = MQ2_LPG_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ2_CO_a;
-        _b = MQ2_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ2_Alcohol_a;
-        _b = MQ2_Alcohol_b;
-      }  
-      else if(nameLectureRequeired == "Propane")
-      {
-        _nameLectureRequeired = "Propane";
-        _a = MQ2_Propane_a;
-        _b = MQ2_Propane_b;
-      }    
-    }
-    else if(_type == 3)
-    {
-      if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ3_LPG_a;
-        _b = MQ3_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ3_CH4_a;
-        _b = MQ3_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ3_CO_a;
-        _b = MQ3_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ3_Alcohol_a;
-        _b = MQ3_Alcohol_b;
-      }  
-      else if(nameLectureRequeired == "Hexane")
-      {
-        _nameLectureRequeired = "Hexane";
-        _a = MQ3_Hexane_a;
-        _b = MQ3_Hexane_b;
-      }   
-      else if(nameLectureRequeired == "Benzene")
-      {
-        _nameLectureRequeired = "Benzene";
-        _a = MQ3_Benzene_a;
-        _b = MQ3_Benzene_b;
-      }
-    }
-    else if(_type == 4)
-    {
-      if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ4_LPG_a;
-        _b = MQ4_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ4_CH4_a;
-        _b = MQ4_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ4_CO_a;
-        _b = MQ4_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ4_Alcohol_a;
-        _b = MQ4_Alcohol_b;
-      }  
-      else if(nameLectureRequeired == "smoke")
-      {
-        _nameLectureRequeired = "smoke";
-        _a = MQ4_smoke_a;
-        _b = MQ4_smoke_b;
-      }   
-    }
-    else if(_type == 5)
-    {
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ5_H2_a;
-        _b = MQ5_H2_b;
-      }   
-      else if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ5_LPG_a;
-        _b = MQ5_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ5_CH4_a;
-        _b = MQ5_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ5_CO_a;
-        _b = MQ5_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ5_Alcohol_a;
-        _b = MQ5_Alcohol_b;
-      }  
-    }
-    else if(_type == 6)
-    {
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ6_H2_a;
-        _b = MQ6_H2_b;
-      }   
-      else if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ6_LPG_a;
-        _b = MQ6_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ6_CH4_a;
-        _b = MQ6_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ6_CO_a;
-        _b = MQ6_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ6_Alcohol_a;
-        _b = MQ6_Alcohol_b;
-      }  
-    }
-    else if(_type == 7)
-    {
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ7_H2_a;
-        _b = MQ7_H2_b;
-      }   
-      else if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ7_LPG_a;
-        _b = MQ7_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ7_CH4_a;
-        _b = MQ7_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ7_CO_a;
-        _b = MQ7_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ7_Alcohol_a;
-        _b = MQ7_Alcohol_b;
-      } 
-    }
-    else if(_type == 8)
-    {
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ8_H2_a;
-        _b = MQ8_H2_b;
-      }   
-      else if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ8_LPG_a;
-        _b = MQ8_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ8_CH4_a;
-        _b = MQ8_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ8_CO_a;
-        _b = MQ8_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ8_Alcohol_a;
-        _b = MQ8_Alcohol_b;
-      } 
-    }
-    else if(_type == 9)
-    {
-      if(nameLectureRequeired == "LPG")
-      {
-        _nameLectureRequeired = "LPG";
-        _a = MQ9_LPG_a;
-        _b = MQ9_LPG_b;
-      }
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ9_CH4_a;
-        _b = MQ9_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ9_CO_a;
-        _b = MQ9_CO_b;
-      }    
-    }
-    else if(_type == 131)
-    {
-      if(nameLectureRequeired == "NOx")
-      {
-        _nameLectureRequeired = "NOx";
-        _a = MQ131_NOx_a;
-        _b = MQ131_NOx_b;
-      }
-      else if(nameLectureRequeired == "CL2")
-      {
-        _nameLectureRequeired = "CL2";
-        _a = MQ131_CL2_a;
-        _b = MQ131_CL2_b;
-      }
-      else if(nameLectureRequeired == "O3")
-      {
-        _nameLectureRequeired = "O3";
-        _a = MQ131_O3_a;
-        _b = MQ131_O3_b;
-      }    
-    }
-    else if(_type == 135)
-    {
-      if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ135_CO_a;
-        _b = MQ135_CO_b;
-      }
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ135_Alcohol_a;
-        _b = MQ135_Alcohol_b;
-      }
-      else if(nameLectureRequeired == "CO2")
-      {
-        _nameLectureRequeired = "CO2";
-        _a = MQ135_CO2_a;
-        _b = MQ135_CO2_b;
-      } 
-      else if(nameLectureRequeired == "Tolueno")
-      {
-        _nameLectureRequeired = "Tolueno";
-        _a = MQ135_Tolueno_a;
-        _b = MQ135_Tolueno_b;
-      }
-      else if(nameLectureRequeired == "NH4")
-      {
-        _nameLectureRequeired = "NH4";
-        _a = MQ135_NH4_a;
-        _b = MQ135_NH4_b;
-      }
-      else if(nameLectureRequeired == "Acetona")
-      {
-        _nameLectureRequeired = "Acetona";
-        _a = MQ135_Acetona_a;
-        _b = MQ135_Acetona_b;
-      } 
-    }
-    else if(_type == 303)
-    {
-      if(nameLectureRequeired == "Iso_butano")
-      {
-        _nameLectureRequeired = "Iso_butano";
-        _a = MQ303_Iso_butano_a;
-        _b = MQ303_Iso_butano_b;
-      }
-      else if(nameLectureRequeired == "Hydrogeno")
-      {
-        _nameLectureRequeired = "Hydrogeno";
-        _a = MQ303_Hydrogeno_a;
-        _b = MQ303_Hydrogeno_b;
-      }
-      else if(nameLectureRequeired == "Ethanol")
-      {
-        _nameLectureRequeired = "Ethanol";
-        _a = MQ303_Ethanol_a;
-        _b = MQ303_Ethanol_b;
-      } 
-    }
-    else if(_type == 309)
-    {      
-      if(nameLectureRequeired == "H2")
-      {
-        _nameLectureRequeired = "H2";
-        _a = MQ309_H2_a;
-        _b = MQ309_H2_b;
-      } 
-      else if(nameLectureRequeired == "CH4")
-      {
-        _nameLectureRequeired = "CH4";
-        _a = MQ309_CH4_a;
-        _b = MQ309_CH4_b;
-      }
-      else if(nameLectureRequeired == "CO")
-      {
-        _nameLectureRequeired = "CO";
-        _a = MQ309_CO_a;
-        _b = MQ309_CO_b;
-      }    
-      else if(nameLectureRequeired == "Alcohol")
-      {
-        _nameLectureRequeired = "Alcohol";
-        _a = MQ309_Alcohol_a;
-        _b = MQ309_Alcohol_b;
-      } 
-    }
-  //Serial debugging
-}
 float MQUnifiedsensor::calibrate(boolean print) {
   //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
   /*
@@ -548,7 +124,8 @@ double MQUnifiedsensor::getVoltage(int read) {
   {
     double avg = 0.0;
     for (int i = 0; i < retries; i ++) {
-      avg += analogRead(this->_pin);
+      _adc = analogRead(this->_pin);
+      avg += _adc;
       delay(retry_interval);
     }
     voltage = (avg/ retries) * _VOLT_RESOLUTION / (pow(2, ADC_RESOLUTION) - 1);
@@ -576,57 +153,6 @@ double MQUnifiedsensor::getRL() {
   return _RLValue;
 }
 
-void MQUnifiedsensor::setDefaultGas()
-{
-    if(_type == 2)
-    {
-      _nameLectureRequeired = defaultMQ2;
-    }
-    else if(_type == 3)
-    {
-      _nameLectureRequeired = defaultMQ3;
-    }
-    else if(_type == 4)
-    {
-      _nameLectureRequeired = defaultMQ4;
-    }
-    else if(_type == 5)
-    {
-      _nameLectureRequeired = defaultMQ5;
-    }
-    else if(_type == 6)
-    {
-      _nameLectureRequeired = defaultMQ6;
-    }
-    else if(_type == 7)
-    {
-      _nameLectureRequeired = defaultMQ7;
-    }
-    else if(_type == 8)
-    {
-      _nameLectureRequeired = defaultMQ8;
-    }
-    else if(_type == 9)
-    {
-      _nameLectureRequeired = defaultMQ9;
-    }
-    else if(_type == 131)
-    {
-      _nameLectureRequeired = defaultMQ131;
-    }
-    else if(_type == 135)
-    {
-      _nameLectureRequeired = defaultMQ135;
-    }
-    else if(_type == 303)
-    {
-      _nameLectureRequeired = defaultMQ303;
-    }
-    else if(_type == 309)
-    {
-      _nameLectureRequeired = defaultMQ309;
-    }
-}
 double MQUnifiedsensor::stringToDouble(String & str)
 {
   return atof( str.c_str() );
diff --git a/src/MQUnifiedsensor.h b/src/MQUnifiedsensor.h
index 919af49..b74b478 100644
--- a/src/MQUnifiedsensor.h
+++ b/src/MQUnifiedsensor.h
@@ -13,40 +13,36 @@
 class MQUnifiedsensor
 {
   public:
-    MQUnifiedsensor(int pin, int type);
+    MQUnifiedsensor(String Placa = "Arduino", int Voltage_Resolution =  5, int pin, String type);
     
     //Functions to set values
     void inicializar();
     void update();
     void setR0(double R0 = 10);
     void setRL(double RL = 10);
-    void setVoltResolution(float voltaje = 5);
-    void setSensorCharacteristics(String nameLectureReqeuired = "", bool print = false);
-    void setDefaultGas();
+    void setVoltResolution(double voltage_resolution =  5);
+    void serialDebug(boolean onSetup = false); //Show on serial port information about sensor
     
     //user functions
     float calibrate(boolean print = false);
-    float readSensor(String nameLectureRequeired = "", bool print = false);
+    float readSensor(<String regressionMethod = "Exponential", float _a, float _b);
     
     //get function for info
     double getR0();
     double getRL();
     double getVoltage(int read = true);
-    double stringToDouble(String & str);
-    String getnameLecture();
-
     
+    double stringToDouble(String & str);    
 
   private:
     /************************Private vars************************************/
-    byte _pin, _type, _lecturePosInArray; 
+    byte _pin;
+    String _type;
+    String _placa; 
     byte _VOLT_RESOLUTION  = 5.0; // if 3.3v use 3.3
     byte _ratioInCleanAir, _sensor_volt;
     byte _RLValue = 10; //Value in KiloOhms
     float  _R0, RS_air, _ratio, _PPM, _RS_Calc;  
-    float _b;
-    double _a;    
-    String  _nameLectureRequeired; 
 };
 
 #endif //MQUnifiedsensor_H