DHT11 vs DHT22 - Temperature/Humidity Sensor Showdown

A review / comparison I've planned for a long time - with an outcome I could only classify as "odd" in multiple ways. Enjoy and feel free to share your thoughts!

Closing Music:
Licensed under Creative Commons: By Attribution 3.0 License

[AndyPue]

Helpful video! Thank you for that.

However, I would read the data for humidity a bit different.
The 88% on the DHT11 could be a sign of hitting the range limit. (If it's 0-80% it needs a way for the software to detect leaving its range, so it may tolerate and send data that can identify leaving the range, if it just had stopped at 80, you would not know if it's sitting there or above.)

The DHT22 could be accurate, high humidity is expected after a rainfall. The sensor was also warmer than the environment, so it does get a different reading on the humidity. It should only be accurate once the sensor completely reaches environment temperature. So the long reaction time would fit the sensor cooling down.
It would not have taken so long to reach the final value if the temperature change would have been smaller, as a different air temperature has a different humidity capacity. Higher temperature can carry more moisture. So warming up the air in a closed box will drop the relative humidity.

This also explains the reverse effect and jump when taking the sensors back inside. They were really cold, compared to the room temperature and possibly below the dew-point, so they got instantly wet, because the air flowing in went above 100% humidity and water condensed in/on the sensor. The DHT11 noticed this by going even more "out of range" but the DHT22 looks exactly like what happens when you put something with 8°C in a room, it gets completely wet until the surface temperature gets high enough.

- Andy

[tjoho]

Tnx for a good video. This is the type if video I'm looking for when deciding to buy sensors to my projects.🤗

[sebascarra]

What's the tool mentioned at 11:32 called? Cabana?? Thanks