Most sensors have some kind of respnse time. Temperature/PH/Humidity I'm currently looking at the SHT75 - Digital Humidity Sensor http://www.sensirion.com/en/01_humidity_sensors/06_humidity_sensor_sht75.htm it says it has a response time of 8 seconds. What does that actually mean? I think it means from the time it "turns on" it takes 8 seconds to get to an accurate reading (or any reading).
Since arduino just quick grabs the output it doesnt check the value for 8 seconds before showing on the serial interface.
So can I assume I am getting accurate readings as long as power is always supplied to the sensor even though arduino is just checking the value once every 30 minutes?
And to follow on that. This will be a battery operated sensor. So I want it to sleep. At which point the sht75 will(should) be off. I'm assuming I can just turn on the sht75 - sleep 8 seconds - then poll the data?