HLK-LD2412
Also known as: LD2412 · Hi-Link LD2412 · Presence & motion
The 'LD2410 but better at people who don't move': longer range and stronger stationary detection. It's the static-presence half of the dual-radar recipe (LD2450 for tracking + LD2412 for stillness) used in 2026's best DIY sensors.
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At a glance
⚑ flag an error| Measures | presence, motion |
|---|---|
| Accuracy | 24 GHz radar tuned for still/seated presence, to ~9 m |
| Interface | UART |
| Supply | 5 V |
| Battery-viable | No (continuous draw) |
| ESPHome | Native ESPHome component — ld2412 |
| Typical price | $5-8 (street, varies) |
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Which one do I buy?
Upgrade pick over the LD2410 when rooms are big or people sit very still; skip it if a $4 LD2410 already covers your room.
Clone check
Good for
Gotchas to know
- Newer part — fewer tutorials than the LD2410; the ESPHome component landed with the 2026.3 LD24xx overhaul.
- Same tuning discipline as every mmWave: gates, sensitivity, placement.
Wiring it up
Give it a hardware UART (UART1/2 on any ESP32) rather than software serial — the radars talk at 256000 baud. Any dev board works; the DevKitC class is the default host, and if you're building a sensor-plus-screen device, pick a display board with spare pins like the JC3248W535.