update: Hlk improved a lot of firmware issues and also started mass production of ld2450, we designed separate enclosures and tested the firmware for up to a month, we are now sharing our sensors:
SCREEK wifi mmWave Human Presence Sensor 2A For Home Assistant (LD2450 esp32c3) | eBay
this is the first story info:
Hilink’s newly released LD2450 radar, which supports some interesting new features, including precise target location of three objects at the same time, looks like a cheap version of the fp2.
We got the radar about 3 weeks ago, we took six pieces of radar and we are interested if it brings new detection effects.
The demo of the OP was interesting, being able to show a person moving, the positioning looked quite ready and when we walked it would correspond to the activity.
The serial protocol is simple and we were able to do the serial reading with a simple esphome serial parsing function:
Note, however, that from the hardware we have received so far, there are some serious problems that make it very difficult to be used very simply, as in the case of the LD2410B:
- The module seems to detect the RX level when it is powered up, and there must be a 5V high signal pull-up before it will start outputting data, otherwise there won’t be any output.
- After the pull-up is completed, the module suddenly stops outputting after a long period of time, say a few hours, sometimes a few minutes. Unless the module is restarted, it does not get any output.
- The module generates more heat, which, like the LD2410, seems to be a natural characteristic of HLK.
These are some of our initial findings, and because of the problems that occurred above, we paused to continue to try to perfect it. We recently reached out to the HLK developers and learned that a new OTA firmware is being refined that will address many of the instability issues.
We got the Android version for internal testing, but we don’t have any Android devices on hand, only IOS devices. Could not continue testing.
HLK is expected to release the IOS version of the OTA upgrade app this week.
We are looking forward to have further progress and see the result of its stability.
UPDATE:
We got the firmware for the internal test and it’s very stable! We ran it for 3 days straight without any dropouts! We are still continuing to test.
Due to the current instability, we have suspended the idea of making it further into a sensor, but for interested esphome players, we can share our kit, including soldered wires with a bh1750 sensor, and the ld2450 radar.
If the new version of the firmware can solve the stability issue, we will further try to make a shell for it, just like we did before.
We will release our esphome profile soon, hopefully after the new firmware is stable.
