This is an automated archive made by the Lemmit Bot.

The original was posted on /r/homeassistant by /u/slboat on 2025-03-27 16:13:31+00:00.

Almost two years have passed since we built the first LD2410 millimeter wave sensor 1U and we are about to reach the 6000th DIY sensor we will build. New millimeter wave sensors haven’t always been that appealing, the LD2410 was very successful, the LD2450 was good (we were fortunate enough to build the first DIY LD2450 Sensor 2A to introduce it to the world of HA), but the LD2412’s most recent update, the LD2412S, which has a redesigned antenna (and has become much more like the LD2410), but still has much more powerful static detection, and longer range detection. The new antenna is thought to have better static detection performance, and in our initial tests it still seems to work well at 6 or 7 meters away.

The L13 is based on the LD2412S sensor as an updated version of our previous L12, and also incorporates the BH1750 professional light sensor (which we used extensively in the 2A, F2, and LS1).

For those who chose the L13, using HLK’s APP HLKRadartool you can use the automatic detection of the underlying noise of the 13 gates, which is a completely new mechanism, unlike the complex threshold settings, it is the module itself that calculates the underlying noise factor (as explained by the hlk developers) to exclude some of the fixed disturbances.It’s a very interesting feature.

Anyway, as always, we are happy to continue exploring these interesting new sensors with you.

It is important to mention that the drawbacks of the L13 include the fact that the ranging distance is not reliably accurate, a feature that seems to have been sacrificed, meaning that you may be showing more than 1m away even when you are in front of the sensor, which seems to be a problem at the closest distances.

As one of the first people to build the LD2412 as a DIY sensor, and having shared our code, as well as working with people to improve on early code issues, we’re looking forward to finding out some interesting things about the LD2412S.

If you haven’t tried SCREEK’s sensors yet, here’s how they work: plug in the matching USB cable to the sensor, connect the sensor’s hotspot, configure the network (if no page pops up, type in 192.168.4.1), the device will be auto-discovered in HA, and that’s all done.

We will give 20% discount on L13 in the next few days and invite everyone to join this fun adventure. We also hope that more people will try this fun new radar module.

Thanks for your support and happy adventuring.