Same radar family, different boards. The letter after LD2410 tells you the footprint, whether it has Bluetooth, and in the S's case a completely different power budget.
Revised September 2026Pick the LD2410C for most builds: 2.54mm pitch, Bluetooth tuning and multi-packs. Pick the LD2410B (or B-P with pins) when you need the slim 7x35mm board with Bluetooth. Pick the original LD2410 only for serial-configured, space-tight jobs. Pick the LD2410S when the sensor must run on batteries at 3.3V.
The LD2410C is the version most makers end up with, and for good reasons. It keeps the LD2410's radar and firmware features, adds Bluetooth, and moves the pins to the standard 2.54mm pitch.
That pitch is the practical win. A normal header solders straight in, and ordinary Dupont jumpers or a breadboard do the rest. The board is 16x22mm, squarer than the original, and fits neatly beside a small ESP32 board.
Watch one difference: the C's pin order starts with TX at pin 1, then RX, OUT, GND, VCC. Diagrams drawn for the original or the B start with OUT. Rewire from the pinout reference, not from an old photo.
Multi-packs of the C make whole-house builds cheap per room, and identical modules mean one config and one tuning routine for every room.
| LD2410 | LD2410B | LD2410B-P | LD2410C | LD2410S | |
|---|---|---|---|---|---|
| Board | 7 x 35mm | 7 x 35mm | 7 x 35mm, pins fitted | 16 x 22mm | Own layout |
| Pin pitch | 1.27mm | 1.27mm | Header soldered | 2.54mm | See S manual |
| Pin 1 | OUT | OUT | OUT | UART TX | 3V3 |
| Supply | 5V | 5V | 5V | 5V | 3.0–3.6V |
| Average current | About 80mA | About 80mA | About 80mA | About 80mA | About 0.1mA at 1Hz reporting |
| Bluetooth | No | Yes | Yes | Yes | No |
| Default baud | 256000 | 256000 | 256000 | 256000 | 115200 |
| Rated range, moving | 5m | 5m | 5m | 5m | 8m (4m still) |
| ESPHome | Built-in ld2410 | Built-in ld2410 | Built-in ld2410 | Built-in ld2410 | Community component |
From Hi-Link's module manuals and the module descriptions. Radio figures (24GHz FMCW, ±60°, 0.75m gates) are shared by the 5V boards.
The LD2410B is the original's 7x35mm strip with Bluetooth added. If you need the narrow board, for a wall plate, a light fitting or a thin bezel, and still want phone tuning, this is the version.
The catch is the connector. The B's five pads sit at 1.27mm pitch, half the usual spacing. Many B modules come with a fine-pitch cable, and the B-P arrives with a header already soldered, which removes the issue entirely.
Pin order matches the original: OUT, TX, RX, GND, VCC from pin 1. Electrically it is the same as the C: 5V supply, 3.3V logic and 256000 baud. It shares the ESPHome ld2410 component too, and its Bluetooth also works with Home Assistant's LD2410 BLE integration.
| You need | Pick |
|---|---|
| Narrow board, phone tuning | LD2410B |
| Narrow board, breadboard pins | LD2410B-P |
| See it work on a PC first | LD2410B test kit |
LD2410 vs LD2410B is a Bluetooth question. Same board, same pins; the B adds the radio for tuning without wires.
The original LD2410 is the board Hi-Link's first manual describes: 7x35mm, five pads at 1.27mm, no Bluetooth. Everything is configured over the serial port.
That makes it a good fit when the sensor lives on an ESP32 permanently and ESPHome handles all tuning. Without a radio, nobody nearby can connect to it with a phone app. Its 1.27mm pads need a fine-pitch cable, and many originals come with one that adapts to 2.54mm Dupont jumpers.
Searches for HLK-LD2410 V1.3 usually point at the original's product manual, revision V1.03 from June 2022, or at a revision number printed on a board. The revisions refine wording and data; the pin table, 5V supply and 256000-baud default stay the same. The firmware version is a different number, readable over serial and shown by ESPHome's version sensor.
If you already own originals, they are fully usable. For a new purchase, the C gives the same radar with Bluetooth and easier pins, so the original makes sense mainly where its slim strip shape or radio-free design is the point. The datasheet guide translates the original's spec table line by line.
The LD2410B-P is the Bluetooth B with its header already soldered on. You get the slim board and phone tuning without fighting 1.27mm pads.
Get the moduleThe LD2410S shares the name and the 24GHz band, but it is a different design. Hi-Link built it for ultra-low power: a 3.0–3.6V supply and an average current around 0.1mA when it reports once a second.
That is several hundred times less than the 5V boards' average, which is what makes months on batteries realistic. It is also rated further: up to 8m for a moving person and 4m for a still one.
So it is not a drop-in replacement. Code, wiring and configuration tools written for the LD2410 do not carry over. The payoff comes when you pair it with a sleeping microcontroller: the S watches the room on a trickle of current and raises OT2 to wake the controller when someone arrives.
More on the S's power budget is in the LD2410S module notes, and the maths for the 5V boards is on the pinout and power page.
LD2410C 3-pack |
LD2410B Bluetooth module |
LD2410B-P module |
LD2410 original module |
LD2410S low-power module |
LD2410D module | |
| Type | Module | Module | Module | Module | Module | Module |
| Version | LD2410C | LD2410B | LD2410B-P | LD2410 | LD2410S | LD2410D |
| Pack | 3-pack | 3-pack | 1 module | 1 module | 1 module | 4-pack |
| Bluetooth | Yes | Yes | Yes | — | — | — |
| Cable | — | Yes | — | Yes | — | — |
| Get the module | Get the module | Get the module | Get the module | Get the module | Get the module |
Two newer letters now turn up alongside the familiar ones. The LD2410D and the LD2410-AA both target stationary presence, but they are built for different rooms.
The LD2410D is described as a streamlined stationary presence sensor. Mounted on a 3m ceiling, it covers a cone with a 4m base radius; on a wall at 1.5–2m it reaches 6m within ±60°. It comes in multi-packs aimed at repeat installs.
The LD2410-AA is rated for moving people out to 9m, with ceiling mounts up to 6m, and offers GPIO and UART interfaces. Its maker describes parameter tuning over Bluetooth or serial. Treat both as their own products: check the module documents for pinout, baud and protocol before assuming LD2410 compatibility.
Beyond the family, the LD2420 and LD2450 solve other problems: a smaller 3.3V presence radar, and position tracking. Those comparisons live in LD2410 vs LD2420 and LD2410 vs LD2450.
Whichever letter you choose, buy one spare. Radar tuning goes faster when you can test a setting on the bench while the first sensor keeps working on the wall.
Same radar and electrics. The C adds Bluetooth, uses a 16x22mm board with 2.54mm pitch and has a different pin order starting with TX.
The B adds Bluetooth for app tuning on the same 7x35mm board with the same pin order. The B-P is a B with pins fitted.
No. It runs on 3.3V at 115200 baud with its own protocol, and the built-in ESPHome ld2410 component does not support it.
Usually the manual revision V1.03 or a board revision. The pinout and 5V, 256000-baud basics do not change between revisions.
The LD2410C: native ESPHome support, Bluetooth tuning and standard 2.54mm pins.
Best LD2410