add explanatory comments to examples

lib/ZE14-O3/examples/ze14-hardwareserial.cpp

@@ -28,5 +28,5 @@ void setup() {
 void loop() {
   Serial.print(sensor.getPPM(), 1);         // print only one decimal place as that is the resolution of sensor
   Serial.println(" ppm");
-  delay(1100);                              // if you would read the sensor at intervals less or equal to 1s there would be no message in buffer
+  delay(1500);                              // if you would read the sensor at intervals less or equal to 1s there would be no message in buffer
 }

lib/ZE25-O3/examples/ze25-active_upload.cpp

@@ -23,10 +23,10 @@ ZE25 sensor(Serial2);                 // any uart can be used - Serial, Serial1,
 
 void setup() {
   Serial.begin(115200);
-    sensor.begin(kActiveUpload);
+    sensor.begin(kActiveUpload);      // sets the sensor to active upload mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
-  delay(1000);
+  Serial.println(sensor.getPPM());    // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
+  delay(1500);                        // if you would read the sensor at intervals less or equal to 1s there would be no message in buffer
 }

lib/ZE25-O3/examples/ze25-quesstion_answer.cpp

@@ -23,10 +23,10 @@ ZE25 sensor(Serial2);                 // any uart can be used - Serial, Serial1,
 
 void setup() {
   Serial.begin(115200);
-    sensor.begin(kQuestionAnswer);
+    sensor.begin(kQuestionAnswer);    // sets the sensor to question answer mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
+  Serial.println(sensor.getPPM());    // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
   delay(1000);
 }

lib/ZE25-O3/examples/ze25-softwareserial.cpp

@@ -20,15 +20,15 @@ along with Winsen sensors library.  If not, see <https://www.gnu.org/licenses/>.
 #include <SoftwareSerial.h>
 #include <ZE25.h>
 
-SoftwareSerial sw_serial(0, 4);
+SoftwareSerial sw_serial(0, 4);               // replace the pin numbers to match yours
 ZE25 sensor(sw_serial);
 
 void setup() {
   Serial.begin(115200);
-  sensor.begin(kQuestionAnswer);
+  sensor.begin(kQuestionAnswer);              // sets the sensor to question answer mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
+  Serial.println(sensor.getPPM());            // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
   delay(1500);
 }

lib/ZE27-O3/examples/ze27-active_upload.cpp

@@ -23,10 +23,10 @@ ZE27 sensor(Serial2);                 // any uart can be used - Serial, Serial1,
 
 void setup() {
   Serial.begin(115200);
-    sensor.begin(kActiveUpload);
+    sensor.begin(kActiveUpload);      // sets the sensor to active upload mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
-  delay(1000);
+  Serial.println(sensor.getPPM());    // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
+  delay(1500);                        // if you would read the sensor at intervals less or equal to 1s there would be no message in buffer
 }

lib/ZE27-O3/examples/ze27-quesstion_answer.cpp

@@ -23,10 +23,10 @@ ZE27 sensor(Serial2);                 // any uart can be used - Serial, Serial1,
 
 void setup() {
   Serial.begin(115200);
-    sensor.begin(kQuestionAnswer);
+    sensor.begin(kQuestionAnswer);    // sets the sensor to question answer mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
+  Serial.println(sensor.getPPM());    // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
   delay(1000);
 }

lib/ZE27-O3/examples/ze27-softwareserial.cpp

@@ -20,15 +20,15 @@ along with Winsen sensors library.  If not, see <https://www.gnu.org/licenses/>.
 #include <SoftwareSerial.h>
 #include <ZE27.h>
 
-SoftwareSerial sw_serial(0, 4);
+SoftwareSerial sw_serial(0, 4);               // replace the pin numbers to match yours
 ZE27 sensor(sw_serial);
 
 void setup() {
   Serial.begin(115200);
-  sensor.begin(kQuestionAnswer);
+  sensor.begin(kQuestionAnswer);              // sets the sensor to question answer mode
 }
 
 void loop() {
-  Serial.println(sensor.getPPM());
+  Serial.println(sensor.getPPM());            // prints out the ppm measured by the sensor (by default Serial.print displays float with two decimal which corresponds two sensor resolution)
   delay(1500);
 }