Fix analog input comments in UnitTesting example

examples/UnitTesting/UnitTesting.ino

@@ -27,11 +27,11 @@
 #define         Pin7                     (A7)  //Analog input 7 of your arduino
 #define         Pin8                     (A8)  //Analog input 8 of your arduino
 #define         Pin9                     (A9)  //Analog input 9 of your arduino
-#define         Pin10                    (A10) //Analog input 9 of your arduino
+#define         Pin10                    (A10) //Analog input 10 of your arduino
-#define         Pin11                    (A11) //Analog input 9 of your arduino
+#define         Pin11                    (A11) //Analog input 11 of your arduino
-#define         Pin12                    (A12) //Analog input 9 of your arduino
+#define         Pin12                    (A12) //Analog input 12 of your arduino
-#define         Pin13                    (A13) //Analog input 9 of your arduino
+#define         Pin13                    (A13) //Analog input 13 of your arduino
-#define         Pin14                    (A14) //Analog input 9 of your arduino
+#define         Pin14                    (A14) //Analog input 14 of your arduino
 #define         PWMPin                   (5)   // Pin connected to mosfet
 /***********************Software Related Macros************************************/
 #define         RatioMQ2CleanAir          (9.83) //RS / R0 = 9.83 ppm 

src/MQUnifiedsensor.cpp

@@ -142,13 +142,10 @@ float MQUnifiedsensor::validateEcuation(float ratioInput)
 float MQUnifiedsensor::readSensor(bool isMQ303A, float correctionFactor, bool injected)
 {
   //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
-
-  float voltRes = _VOLT_RESOLUTION; // preserve global resolution
   if(isMQ303A) {
-    voltRes = voltRes - 0.45; //Calculations for RS using mq303a sensor look wrong #42
+    _VOLT_RESOLUTION = _VOLT_RESOLUTION - 0.45; //Calculations for RS using mq303a sensor look wrong #42
   }
-  _RS_Calc = ((voltRes*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas
+  _RS_Calc = ((_VOLT_RESOLUTION*_RL)/_sensor_volt)-_RL; //Get value of RS in a gas
-
   if(_RS_Calc < 0)  _RS_Calc = 0; //No negative values accepted.
   if(!injected) _ratio = _RS_Calc / this->_R0;   // Get ratio RS_gas/RS_air
   _ratio += correctionFactor;