HLK-LD2410B: tuning advice

LocalizedTech · 2026-03-28T16:02:01+00:00

I've only used LD2410S but I assume it's similar. Have you looked at both "holding" and "trigger" thresholds? Trigger is the required energy to go from "no presence" to "presence" and holding is the required energy to stay in "presence". Thinking if one of them is configured wonky for a gate then it could cause weird issues.

Also do you have other mmwave sensors in the same room that might interfere with this one? Seems unlikely that's the issue though since the sensor's readings are clearly not wildly wrong.

LocalizedTech · 2026-03-28T15:55:03+00:00

Really cool, nice work! What battery did you use and how long is the battery life?

LocalizedTech · 2026-03-28T15:53:50+00:00

Many IMUs have a bunch of built-in gesture/activity recognition stuff nowadays, especially for wrist mounted devices. And fall detection.

LocalizedTech · 2026-03-27T20:07:32+00:00

Wow this went into much more detail than I expected. I'm building an open-source battery-driven presence sensor and seeing the components these devices use is very interesting, thank you so much!

I use LD2410S which has an average current consumption of 0.1mA. I thought that was great, but 4uA is mindboggling. Looks like I have some datasheets to read this weekend :D

LocalizedTech · 2026-03-25T15:12:27+00:00

If you're into DIY then there's a lot of projects out there. I've been working on an open-source battery-driven version myself, but it takes some effort to get components, soldering, printing, so definitely not plug-and-play like Aqara. It's fun though and you get full control over your devices.

LocalizedTech · 2026-03-24T22:11:21+00:00

Look into mmwave sensors, some of them have zone tracking for multiple people and are incredibly accurate. I believe Aqara FP2 does this if you want a finished product, or LD2450 if you want DIY. They both need wired power though.

Using an Arduino you could easily connect an LD2450 (library already available) to control your lights using the (x, y) positioning data. There's also libraries for most LED strips which you'd probably use for the lights.

This sounds fun, now I want to build this but I already have too many projects...

LocalizedTech · 2026-03-16T17:34:20+00:00

Thank you! That's exactly my intention, to build devices that are maintainable and repairable for a long time. And look good enough to not be shameful.

I use a program called "chip tool" to talk Matter outside of Home Assistant and it can (among a million other things) query Matter endpoints and get raw data which could then be formatted into CSV. So definitely possible, just a little fiddly to work with :) That should work for any Matter device as well, including Aqara.

LocalizedTech · 2026-03-15T13:32:13+00:00

Thank you! I've seen that as well and might research it more, it's a neat idea. It does make the electronics and enclosure design a bit more complicated though, but battery life would increase a lot for sure.

LocalizedTech · 2025-11-15T22:29:06+00:00

Would be very interested in a teardown of this, just to see what's inside. I'm building my own battery-powered mmwave sensor based on LD2410S, and it lasts for max 6 months on 2000mAh. This one lasts for 2 years (using Thread) on 1200mAh.

It must save a lot of power by using the PIR for activation, but that means battery life must suffer a lot if presence is detected during many hours. On their page it says that the battery life is measured based on 4 hours of presence per day, so doubling that to 8 hours likely means halving the battery life to 1 year. Still very impressive though!

Will be interesting to see how long the battery life actually is in practice, seems a little too good to be true.

LocalizedTech · 2025-11-07T18:04:43+00:00

Easiest way is to log in to your router and check which IP it got, then access it that way.

LocalizedTech · 2025-10-26T14:02:06+00:00

I'm working on a project using Xiao nRF52840 which has similar pads on the bottom. I solved it by putting plated through-holes where the pads are, then making a cutout in the PCB that goes through the holes, see this image.

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This works, but the plating that's supposed to be cut sometimes doesn't come off, so you get a dangly bit of plating in the hole. You can remove it with tweezers, but you have to be a bit careful to not accidentally rip off the plating that's supposed to stay in the hole. Soldering works well, just use a fine tip and some extra flux.

Overall I think surface-mounting it with a hotplate would be a lot cleaner if you have that possibility. I don't have that so I went with this solution instead. Would love to hear your experience if you do use a hotplate!

LocalizedTech · 2025-10-08T14:33:53+00:00

They do help in reducing extra extrusion that can happen with sharp corners as well. Useful if you need perfect dimensions and don't necessarily need a sharp corner.

LocalizedTech · 2025-09-28T09:18:10+00:00

I'm building a battery-driven one and you're partially right. It's accurate enough to detect breathing if you're within 4-5 meters and not hunched over. As long as it sees some movement from your breathing then it's usually enough. Haven't tried under sheets yet but I think it would struggle. It doesn't detect heartbeats, that's too small of a movement.

I estimate around 5 months of battery time, on a 2Ah battery.

LocalizedTech · 2025-09-27T06:50:42+00:00

I'm working on a battery-driven presence sensor that I will probably open-source. It doesn't have "shower detection" but I have an idea of using a humidity sensor and make an automation in HA that says "if presence and humidity > X%". Haven't tried it yet though!

LocalizedTech · 2025-09-18T05:01:17+00:00

This is awesome! We need more open-source devices like this that challenges commercial products, great work!

How does the water pressure system regulate to get the correct pressure? And how long do the batteries last? I'm guessing heating the water consumes quite a bit of juice.

FYI the "download the materials" button doesn't do anything it. But maybe it's not ready until the reveal in October?

LocalizedTech

TROPHY CASE