In the mmwave sensors we've DIY'd, we've tried a few different combinations. Among them:
- The 2A (LD2450) is capable of recognising the X and Y coordinates of up to three targets, a landmark cost-effective way of locating coordinates. It has the advantage of being able to acquire the X coordinate of a target at the same time, as well as up to three targets at the same time. The disadvantage, however, is that it is less responsive and tends to lose targets when multiple targets are at the same time. But this is a public challenge for radar functionality, and even the fp2 does not perform perfectly.
- Gen1 (LD2410C), in this series, is our earliest shared product with various models, 1W (X), 1M (R, S), 1U. Their radar modules are now LD2410C, which is the best selling radar module from HLK, with integrated bluetooth, extremely cost-effective, and can be as far as 6m away with a 60-degree range. The downside of it is that it is quite fiddly to adjust the parameters and has a lot of gate settings. As well as its recognition algorithm is based on signal strength, which can sometimes be a pain in the arse when it comes to eliminating specific interference. Another disadvantage is that it is rather hot.
- F2 (LD1125F), without X recognition, is more like an improved version of the LD2410C series, but with a worse price/performance ratio. It's more energy efficient, doesn't have a lot of heat, and is almost always gentle to the touch. It has a little more coverage. But it doesn't have more bang for the buck and could disrupt HLK's own product line, which isn't sold online. Another similar model of this radar solution is the CEM5825F from another company, and they performed almost identically in our tests, even down to the look and feel.The other one in HLK's line is the LD1125H, and this one generates a lot more heat, and the chip solution may be different, being an earlier product. It is the only one in these models that does not support Bluetooth parameter adjustment, but its adjustment is very simple, only three stages, simple sensitivity settings. It seems to have some smarter algorithms, but for those who are hot ah fine adjustment may be less capable of this adjustment, in other words, it makes life simpler.
- L12 (LD2412), this is a new product that HLK is stepping up testing, the main features are a larger angle than the LD2410 (enhanced from 60 degrees to 75 degrees), and a longer distance (6 metres enhanced to 9m). The corresponding antenna design has been improved and the static capability is more sensitive, making this a promising radar in our tests. On the downside, it is still complicated to adjust parameters and generates more heat (slightly better than the LD2410, probably due to the processor enhancement). The price/performance ratio is very good, and you can adjust the parameters over Bluetooth. The improved range and sensitivity is appealing in many senses. Currently in preliminary public testing (roughly 200 pieces released), in the earliest tests, just like the LD2450, there can not be serial output of the bug. but has been identified as a hardware problem, HLK has provided a temporary solution (the problem comes from the power-up of an I2C near the timing caused by the radar chip misconfiguration, no output). . And that it will be fixed completely in batch.
We will hopefully have a chance to share the L12 radar with you next and see how this new radar performs with you.
It's great that we've learnt a lot of new things on these adventures that we've all been on together.