I'm back, with another mmWave presence sensor review. This new Zigbee mmWave presence sensor device which actually available in two variants, 5.8 and 24 GHz. The former (MTD085) has been supported by Zigbee2MQTT since perhaps the beginning of the year, while the latter (MTD285) hasn't supported yet.
First, we need an external converter, which fortunately is provided by the manufacturer (or seller), pretty unusual for devices from Tuya, although there are still some bugs and oddities. After some testing, fixes, and some modifications, the external converter is finally ready to use. You can check the external converter on the Z2M GitHub issue. Oh, and I've also submitted a PR, and it will be supported in the next month's Z2M release.
I was quite surprised when I opened the case, this sensor (24 GHz) uses a
DFC4001 mmWave chip, the same chip used by the
DFRobot C4001 sensor, which our friend also reviewed. From my observations, the body of current mmWave presence devices are now smaller but a bit thicker, and the sensor is placed in front of the main PCB using pins, this is quite different from the old released devices which were generally quite wide but thin, and the sensor was directly stacked with the main PCB. Does this device perform well? Let's give it a try.
What's even more surprising is that this device offers quite a lot of setup options, both in the Tuya Smart Life app itself and on the Z2M—again, uncommon for a Tuya device in the past. As you can see, there are “easy” setups, even with auto and preset modes, as well as more complex settings, similar to those found on ESPhome's LD2410. Just to note, the noise collection setting in addition to automatically adjust the sensitivity (both gates and presets), will also set (limit) the lowest value that can be set manually (at least that's what I experienced on my device).
Let's move on to performance. It wouldn't be perfect if a presence sensor device, even though it has complex settings, didn't perform well, right? Fortunately, this sensor performed quite well. Testing was the same as before, in the same bedroom. Overall, its performance was nearly identical to the M100-24GV3, and slightly better than the Moes/Linptech with LD2410. It quickly detects presence, has minimal false positives due to fans and curtains, and is quite reliable in detecting people in deep sleep, although there are still some false negatives (false negatives are very rare with the M100-24GV3). Of course it needs some fine tuning, and don't forget to take advantage of the auto noise collection setting I mentioned above. The
good thing is, this device doesn't spam the zigbee network like the issue with the old mmWave Tuya device.
In conclusion, this sensor is probably suitable for those of you who want a sensor that is quite reliable and easy to use, but still has many options for further tweaking.
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