Added serial print in calibrations

src/MQUnifiedsensor.cpp

@@ -550,10 +550,12 @@ int MQUnifiedsensor::calibrate(boolean print) {
   if(print)
   {
     Serial.println("*******Calibrating*********");
-    Serial.println("_sensor_volt: " + String(_sensor_volt));
-    Serial.println("_VOLT_RESOLUTION: " + String(_VOLT_RESOLUTION));
-    Serial.println("_ratioInCleanAir: " + String(_ratioInCleanAir));
-    Serial.println("R0: " + String(R0));
+    Serial.println("* Sensor: MQ-" + String(_type) + "*");
+    Serial.println("* _sensor_volt: " + String(_sensor_volt) + "*");
+    Serial.println("* _RLValue: " + String(_RLValue) + "*");
+    Serial.println("* _VOLT_RESOLUTION: " + String(_VOLT_RESOLUTION) + "*");
+    Serial.println("* _ratioInCleanAir: " + String(_ratioInCleanAir) + "*");
+    Serial.println("* R0: " + String(R0) + "*");
     Serial.println("*******Calibrating*********");
   }
   return R0;

src/MQUnifiedsensor.h

@@ -288,8 +288,8 @@ class MQUnifiedsensor
     String  _nameLectureRequeired;   
     int _VOLT_RESOLUTION  = 5.0; // if 3.3v use 3.3
     int _RLValue = 10; //Value in KiloOhms
-    int  _ratioInCleanAir, _PPM, _sensor_volt;
-    float RS_air, _m, _b, _ratio;
+    int _PPM;
+    float _ratioInCleanAir, _sensor_volt, RS_air, _m, _b, _ratio;
     
 };