Fixed calibration

.vscode/c_cpp_properties.json

@@ -3,8 +3,10 @@
         {
             "name": "Win32",
             "includePath": [
-                "C:\\\\\\\\Users\\\\\\\\migue\\\\\\\\AppData\\\\\\\\Local\\\\\\\\Arduino15\\\\\\\\packages\\\\\\\\esp8266\\\\\\\\tools\\\\\\\\**",
-                "C:\\\\\\\\Users\\\\\\\\migue\\\\\\\\AppData\\\\\\\\Local\\\\\\\\Arduino15\\\\\\\\packages\\\\\\\\esp8266\\\\\\\\hardware\\\\\\\\esp8266\\\\\\\\2.4.2\\\\\\\\**"
+                "C:\\\\Users\\\\migue\\\\AppData\\\\Local\\\\Arduino15\\\\packages\\\\esp8266\\\\tools\\\\**",
+                "C:\\\\Users\\\\migue\\\\AppData\\\\Local\\\\Arduino15\\\\packages\\\\esp8266\\\\hardware\\\\esp8266\\\\2.4.2\\\\**",
+                "C:\\Users\\migue\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.4.2\\**",
+                "C:\\Users\\migue\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\**"
             ],
             "forcedInclude": [],
             "intelliSenseMode": "msvc-x64",

examples/MQ-Board-Calibration/MQ-Board-Calibration.ino

@@ -95,27 +95,28 @@ void setup() {
   //Print in serial monitor
   Serial.println("MQ2 to MQ9 - Calibracion");
   Serial.println("Note - Make sure you are in a clean room and the sensor has pre-heated almost 4 hours");
+  Serial.println("Note - All values are in KOhms");
   Serial.println("Autonumeric, MQ2(R0), MQ3(R0), MQ4(R0), MQ5(R0), MQ6(R0), MQ7(R0)");
   //Wait one second to continue
   delay(timeDelay/10);
 }
 
 void loop() {
-  //Review in serial port the measures
-  bool printRawData = true;
+
   //Read the sensor
-  int lecture2 =  MQ2.calibrate(printRawData);
-  int lecture3 =  MQ3.calibrate(printRawData);
-  int lecture4 =  MQ4.calibrate(printRawData);
-  int lecture5 =  MQ5.calibrate(printRawData);
-  int lecture6 =  MQ6.calibrate(printRawData);
-  int lecture7 =  MQ7.calibrate(printRawData);
-  int lecture8 =  MQ8.calibrate(printRawData);
-  int lecture9 =  MQ9.calibrate(printRawData);
+  int lecture2 =  MQ2.calibrate();
+  int lecture3 =  MQ3.calibrate();
+  int lecture4 =  MQ4.calibrate();
+  int lecture5 =  MQ5.calibrate();
+  int lecture6 =  MQ6.calibrate();
+  int lecture7 =  MQ7.calibrate();
+  int lecture8 =  MQ8.calibrate();
+  int lecture9 =  MQ9.calibrate();
 
   
   //Print in serial monitor
   char out[40];
+  //snprintf(out, 30, "%d,%d,%d,%d,%d,%d,%d,%d", contador, lecture2, lecture3, lecture4, lecture5, lecture6, lecture7, lecture8, lecture9);
   snprintf(out, 30, "%d,%d,%d,%d,%d,%d,%d,%d", contador, lecture2, lecture3, lecture4, lecture5, lecture6, lecture7, lecture8, lecture9);
   Serial.println(out);
   

src/MQUnifiedsensor.cpp

@@ -527,7 +527,7 @@ int MQUnifiedsensor::readPPM(int m, int b) {
   double ppm = pow(10, ppm_log); //Convert ppm value to log scale
   return floor(ppm);
 }
-int MQUnifiedsensor::calibrate(boolean print) {
+float MQUnifiedsensor::calibrate(boolean print) {
   //More explained in: https://jayconsystems.com/blog/understanding-a-gas-sensor
   /*
   V = I x R 

src/MQUnifiedsensor.h

@@ -274,7 +274,7 @@ class MQUnifiedsensor
     int readSensor(String nameLectureRequeired = "", bool print = false);
     int readPPM(int m, int b);
     
-    int calibrate(boolean print = false);
+    float calibrate(boolean print = false);
     double getVoltage();
     double stringToDouble(String & str);