Yeah, I read in another thread you were from Lincoln. I knew you would understand what i was talking about. What are the time units on the x-axis of your graph? Is the temp jump when the lights came on? The drop in humidity was much quicker than the rise in temp. It will be interesting in the next few days to see if the inverse temp/humidity relationship is as dramatic, or if this is an outlier.
Originally Posted by kwende
I came home this afternoon and realized the 9V power supply I was using died (it was simply a battery pack); so tomorrow I'll have to spend a few minutes and drag an actual cable into the terrarium (I was hoping the 9v battery pack would last longer). So...I will have to restart my tests. Just an FYI.
The x-axis are 5-minute intervals; in other words, every five minutes I appended a new data point to the file. I don't have an on-board clock so I cannot translate that to wall time without using offsets (and I'm not sure how accurate the timer is on the Arduino so I can't account for drift).
I believe the temp jump is the result of the lights coming on, but I also think it's the result of the temperature increasing in the house itself. We have the house running on a thermostat. All of the things you bring up: the change in temperature vs. humidity interests me and I have an interest to try to understand if I can come up with a reasonable intuition as to why these things happen. Hopefully after I fix the setup tomorrow I'll be able to run it indefinitely and, after a week, I should have some good data.
It's worth noting I'm still slightly puzzled by the occasional spikes in the humidity sensor. Like I said earlier, I'm blaming this on sensor noise. However, the fact it is not constant is a bit interesting.