About Veronica716

Hi Jet, I understand that. I just don't have any absolutely accurate hygrometers available to me. To counteract that, I wanted to use a controlled environment (a sealed glass jar). I understand that you believe that the environment is not actually controlled. I undersand that you have doubts because there is no refference device but you also mentioned that the water may not be constant anyway. I am interested in knowing where those doubts come from. Where could this water content fluctuation be coming from? I know you cannot tell with certainty, but any thoughts and guesses you had are still valuable to me.  ... View more

Hi Jet, I undertsand that you all don't believe the water content in my jar is constant. Could you explain to me why you think this is the case? Like I mentioned before, I have done a lot of research to find a possible way that the water content could not be constant. It seems that you have the answer to this. Could  you explian to me what is chemically going on to make the water content not constant? Or link some resource that can support that idea? That would be incredibly helpful.   Thank you. ... View more

Hi Jet, I don't think I am using BME280 API. I am using a library in my arduino code called Adafruit_BME280.h Would the BME280 API account for this problem I am having? ... View more

Hi Jet, Thank you for talking with your experts. I would definitely use a precise humidity barometer but I actually do not need an accurate value of absolute humidity. I am only focusing on the change in humidity. The actual value is not important for my applications, I just need to know if the humidity is changing. I want to use the sensors to detect water leaks into a container. I am using the jar right now as a control because I know no water can get in or out, but I am not getting constant humidity from the sensors. This is not a big problem if I could predict the innaccuracy of the sensors. I want to understand why they are not giving me constant humidity so I can take it into account in my data analysis so I can understand what an enivronement without constant humidity would look like with these sensors. Right now, I know that an environment with constant humidity gives me data without constant humidity. If I can understand this fluctuation in humidity in the sensors, I can better understand what it would look like if the environment stopped having constant humidity. You mentioned the sensors have a deviation with the real ambience and I agree that it is acceptable since I do not need an accurate sarting value for humidity. I only care about if that value increases or not. If the only error in the sensors was a deviation in value, than I would not expect the problem I am having and I am unsre if calibration would fix this beacause the humidity read by the sensors would probably still fluctuate. Even if the sensors did not give me an accuarate value of humidity, I would still expect that humidity value to be constant but I am not seeing that. The relationship between the RH and temperature from the sensors is not consistent with constant humidity. I expect the temperature and relative humidity to change but I expect them to always correlate with the same absolute humidity. I made this graph last year and you can see that at a constnt AH, the temperature and relative humidty values can change but still correlate to that AH value. Therefore, I expected to see a constant humidty in the jar based on the RH and temperature values given to me by the sensors. Thank you for your consistent responses. Please let me know if you think I am wrong in anything or if you need any more clarification. I am open to being wrong, but I would like to know where and why I am wrong so I can better understand.   ... View more

Hi Jet, I considered that possibility as well. I know that relative humidity changes with temperature. However, if water is constant and there is no condensation, the absolute humidity does not change with temperature. I considered that maybe condensation was happening in my case but the relative humidity never approaches 100% (saturation). I also never observed any condensation. There is very little water vapour in the jar. The concentraion of water in the jar is the same as in the air. When I did research online to get more answers about the possible condensation, I could not find anything to explain what I was seeing. I do not believe water condensation explains what I am seeing. If it is the case though, it would be very helpful if you could send me some sources that can help me better undersatnd what could be happening. I believe it may have to do with what the sensors are designed for. Maybe they aren't made to mointor accurate water content in a small cofnined space? I don't necessarily think it is any flaw in the sensors, I just think I may be using them for something they are not intended for. And if that is the case, I would like to better understand why they don't work perfectly for my application so I can take that into account in my calculations and tests.   Thank you for your quick responses  ... View more