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24GHz Radar Presence Detector that Works (LD2410) (Patreon)

Published:
2022-09-24 09:57:21
Imported:
2026-06
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Detecting humans is one of the biggest challenges in Home Automation. Most of us use PIR sensors for that purpose. Unfortunately, they do not detect presence without movement and switch off. Who wants that the TV switches off when you quietly watch a video? Recently, new radar sensors appeared that solve this problem. But they have a slow reaction when you enter the room. Some YouTubers suggest combining such a sensor with a PIR. An expensive workaround.

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Detecting humans is one of the biggest challenges in Home Automation. Most of us use PIR sensors for that purpose. Unfortunately, they do not detect presence without movement and switch off. Who wants that the TV switches off when you quietly watch a video? Recently, new radar sensors appeared that solve this problem. But they have a slow reaction when you enter the room. Some YouTubers suggest combining such a sensor with a PIR. An expensive workaround. My second channel: https://www.youtube.com/HB9BLAWireless Links: LD2410 Sensor: https://s.click.aliexpress.com/e/_DnFejPD LD2410 including base: https://s.click.aliexpress.com/e/_DnFejPD Aqara FP1 Sensor: https://s.click.aliexpress.com/e/_DFWJrMF Tuya sensor??: https://s.click.aliexpress.com/e/_DcHLk0n LD2410 Info: https://www.iclegend.com/en/product/list/S3KM111L/#doctor Sensor info: https://h.hlktech.com/Mobile/download/fdetail/198.html FCCio Database: https://fccid.io/2AWE7 Home Assistant Radar project: https://community.home-assistant.io/t/mmwave-wars-one-sensor-module-to-rule-them-all/453260 Tuya Sensor blog post: https://blakadder.com/cheapest-tuya-human-presence-sensor/ Other 24GHz Sensor: The links above usually are affiliate links that support the channel (no additional cost for you). Supporting Material and Blog Page: http://www.sensorsiot.org Github: https://www.github.com/sensorsiot My Patreon Page: https://www.patreon.com/AndreasSpiess Discord: https://discord.gg/JfgDSa8 If you want to support the channel, please use the links below to start your shopping. No additional charges for you, but I get a commission on your purchases to buy new stuff for the channel My Amazon.com shop: https://www.amazon.com/shop/andreasspiess For Banggood https://bit.ly/2jAQEf4 For AliExpress: http://bit.ly/2B0yTLL For Amazon.de: http://amzn.to/2r0ZCYI For Amazon UK: http://amzn.to/2mxBaJf For ebay.com: http://ebay.to/2DuYXBp https://www.facebook.com/profile.php?id=100013947273409 https://twitter.com/spiessa https://www.instructables.com/member/Andreas%20Spiess/ Please do not try to email me. This communication channel is reserved for my primary job As an Amazon Associate, I earn from qualifying purchases #no#midroll#ads

Comments

Ristomatti Airo

Great find! I ordered a couple to try out (hopefully some day). This truly is one of the most annoying problems to solve in home automation. The firmware config app sure seems sketchy with both Chrome and Windows giving warnings about it though. I'll definitely use a virtual machine to do the config but I've found that to be somewhat risky especially for flashing devices. Depending on the flashing process, the decide might disconnect briefly which sometimes requires manually re-mapping the USB device to the VM. I hope we'll get a quick follow up at some point when you've had the sensor running some time. Anyway, it's always interesting to see new sensor content! :)

AndreasSpiess
>>92329256

It is probably better to not use its firmware. You have a good description of the interface. So it should be possible to read the values and do the decisions on the MPU. Maybe we even get a small library for this sensor...

Anonymous

Is it able to distinguish between you and the cat lurking in the background of the living room footage? This seems to be another Hard Problem for home automation judging by the performance of my Ring security system!

AndreasSpiess
>>92500489

Hi John, the only possibility the sensor has is to measure the strength of the reflected signal. Since the cat weighs much less, she must be much closer to the sensor than a human body to create the same signal strength. Because these sensors also measure distance, it should be possible to distinguish between them. But maybe not 100% If you want that, you probably need a camera