Updated examples to MQ-4

examples/MQ-3/MQ-3.ino

@@ -31,9 +31,6 @@
 //Declare Sensor
 MQUnifiedsensor MQ3(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);
 
-//Variables
-float CH4, LPG, CO, Alcohol, Hexane, Benzine;
-
 void setup() {
   //Init the serial port communication - to debug the library
   Serial.begin(9600); //Init serial port
@@ -41,7 +38,17 @@ void setup() {
   //Set math model to calculate the PPM concentration and the value of constants
   MQ3.setRegressionMethod("Exponential"); //_PPM =  a*ratio^b
   MQ3.setA(4.8387); MQ3.setB(-2.68); // Configurate the ecuation values to get Benzene concentration
-  
+  /*
+    Exponential regression:
+  Gas    | a      | b
+  LPG    | 44771  | -3.245
+  CH4    | 2*10^31| 19.01
+  CO     | 521853 | -3.821
+  Alcohol| 0.3934 | -1.504
+  Benzene| 4.8387 | -2.68
+  Hexane | 7585.3 | -2.849
+  */
+
   // Calibration setup
   MQ3.setR0(3.86018237);