Some updates on my setup, if someone is interested. It worked very well for about 3 weeks. No actual false triggers, except for the random foxes and neighbors cats running around at night
That is, until yesterday. That is when it started to fire false triggers like crazy, every couple of minutes over many hours. What happened ? Well, it started to rain…
So that thing is not only over sensitive to Wifi, but also to rain. It kinda makes sense if you think about it, rain is a big aggregated body of moving water after all. But it also makes this sensor totally useless for my use case. Even an inside sensor was triggered due to heavy rain from outside of the window. I will still try to make the module less sensitive by adding a resistor to the R-GN pads. We’ll see how that goes.
I also tried the HFS-DC06. This one was even worse (and more expensive) and pretty much unusable outside.
In the end, this is all cheap Chinese stuff. They’re designed to cost a few cents to manufacture, not to perform well. They are fun, work surprisingly well in a controlled environment. But as soon as you actually start relying on them for some automation, you will run into their failure modes. I started looking around for higher quality alternatives. Bosch is doing some heavy duty outside rated microwave sensors, I’ll look into those. Of course they cost like 50 times more than an RCWL, but reliability has a price I guess