[spudstrawb]

I swapped my 2 HTU21D sensors over (after stopping CumulusMX and depowering the RX and TX units). Keep in mind that they are almost side by side (less than 1m apart) on my desk at the moment. Upon repowering, the lines have now crossed over on the Relative Humidity chart in CumulusMX. So the issue is with the sensors, not with anything else. The problem is that I don't know which one is correct and which one isn't. I purchased them both at the same time from the same ebay seller, so you would think they would be from the same batch. Currently one is reading 53.2% and the other is reading 56.2%. I'll see how it goes for a while and then decide whether I should buy something else. I won't be losing any sleep over it though.