 	TCCR1A = 0;// set entire TCCR1A register to 0
 	TCCR1B = 0;// same for TCCR1B
 	TCNT1 = 0;//initialize counter value to 0
-	// set compare match register for 1hz increments
+	// set compare match register for 4 seconds increments
 	OCR1A = 62499;// must be <65536, see worklog for calculation
 	// turn on CTC mode
 	TCCR1B |= (1 << WGM12);

	digitalWrite(LED_POWER, LOW); // power on the LED
	delay(delayTime);
	dustVal = analogRead(DUST_PIN); // read the dust value via pin 5 on the sensor
	delay(delayTime2);
	digitalWrite(LED_POWER, HIGH); // turn the LED off
	delay(offTime);

	delay(200);
	Serial.print("Dust value: ");
	Serial.println(dustVal);


	}

	readGasLevel();
	// delay(GAS_LEVEL_READING_PERIOD_MILLIS); // interval between readings no longer needed

	// **************** FOR TEMP & HUMIDITY SENSOR ****************

