   delay(3000);
   SeeedOled.clearDisplay();
 
-  Serial.begin(9600);
+  Serial.begin(9600); //seting the serial speed. if including more sensors increase to a standard value. not needed at the moment as overall sampling speed is +/-5 secs
   pinMode(8, INPUT);
   starttime = millis();
 
-  Serial.println("Air Quality Gizmo by LMO");
-  Serial.println("Time s, Humidity %, Temperature C, PM ug/m^3, VOC mg/L, Hydrocarbs mg/m^3");
+  Serial.println("Air Quality Gizmo by LMO"); 
+  Serial.println("Time s, Humidity %, Temperature C, PM ug/m^3, VOC mg/L, Hydrocarbs mg/m^3");  //header of the text file; can be imported as csv in excell
 
   dht.begin();
 

  float t = dht.readTemperature();

  {
    Serial.print(millis()/1000);
    Serial.print(",");
    Serial.print(h,1);
    Serial.print(",");

float concentration = 0;
int sensorValue = 0;

#define DHTPIN A2  //defining temp and humi sensor analog pin
#define DHTTYPE DHT11  //define the type of sensor. check the specsheet and seeed wiki
DHT dht(DHTPIN, DHTTYPE);

void setup() {
