September 2019 Update

New! We're moving to the new forum!

ALL new Blog posts will be on the forum.

Please join us there.

This Blog will no longer be updated...

Monday, August 26, 2019

Humidity and the DHT22

It turns out these temperature/humidity sensors don't like to be kept in a high humidity environment for very long.  I had one in my clone chamber, which was consistently about 28C and 90-100% humidity. That sensor now reads 99.9% humidity no matter what the actual humidity.  Apparently this is pretty common.  The good news is, they are only about $4 each, so I'll order some spares this time :) I wanted to create this post so I could share the link to some information on how you might fix it.  For $4 I'll skip the fixing and just replace them as needed...



Item #5 describes how to fix it.

Excerpt from


Item 4 is interesting, considering I keep one in each grow space, generally directly in the light, because that's where I want to measure the temperature...

No comments:

Post a Comment

Any comments deemed off topic or offensive will be removed