Fixed voltage calculation

src/MQUnifiedsensor.cpp

@@ -64,7 +64,7 @@ void MQUnifiedsensor::serialDebug(bool onSetup)
   {
     if(!_firstFlag)
     {
-      Serial.println("| ****************************************************************" + _type + "****************************************************************|");
+      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
     }

src/MQUnifiedsensor.h

@@ -42,10 +42,10 @@ class MQUnifiedsensor
     byte _pin;
     byte _firstFlag = false;
     byte _VOLT_RESOLUTION  = 5.0; // if 3.3v use 3.3
-    byte _ratioInCleanAir, _sensor_volt;
+    byte _ratioInCleanAir;
     byte _RL = 10; //Value in KiloOhms
     
-    double _adc, _a, _b;
+    double _adc, _a, _b, _sensor_volt;
     float  _R0, RS_air, _ratio, _PPM, _RS_Calc;  
     
     String _type;