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The original was posted on /r/homeassistant by /u/slboat on 2025-06-17 12:27:37+00:00.
We’ve been building millimeter wave sensors for the LD2412S for several months now, and they seem to be working pretty well, so more people are welcome to try them out, it has pretty good static capability, and a large angle (75 degrees), and a long range, and in general, it’s bigger and wider than the ld2410.
Of course, it can’t recognize areas, because it can only recognize how far away the target is.
But, I think it’s really interesting because it has a lot of gates and is also very easy to get started, for the most basic needs (replacing a PIR), stick it on the wall and you’re done.
For mounting it, you need to find a 1.5~2m wall to stick it on.Connect the mating hotspot (Bluetooth mating is also supported in this new version of the hardware, but let’s just say WIFI mating), set up the WIFI network in there, and like all ESPHome sensors, they start working right away, get auto-discovered by the HA, click on add and you’re done.
For fine tuning, don’t miss the HLKRadartool app, which allows you to dynamically see the various parameters, adjust thresholds, and do options like bottom noise exclusion.
Some of our suggestions for how to get it on the wall without being objected to by the wife of the family are to use power supply cables up to 3m-5m long to hide them cleverly.Also you can put a picture or something on the outside of the sensor to make it work through non-metallic material.
All in all, we are ready to offer 8% discount, for all our DIY sensors.
This is in line with the strange shopping holiday of 618.
We’re preparing some new stuff to share and we hope the next adventure is great, thanks guys.
https://www.ebay.com/itm/186623728007
Or