BMT LD2410C 24GHz Human Presence mmWave Radar Sensor

BMT LD2410C 24GHz Human Presence mmWave Radar Sensor – Technical Specifications:

Sensor Type – 24GHz FMCW mmWave Radar
Manufacturer – Hi-Link (HLK-LD2410C)
Operating Frequency – 24.0–24.25GHz (ISM Band)
Detection Range – Up to 6m (Motion) / Up to 5m (Static Presence)
Distance Resolution – 0.75m
Detection Angle – ±60°
Detection Type – Movement + Static Presence (Breathing/Micro-Motion)
Output – Digital GPIO (3.3V Logic) + UART (256000 baud)
Operating Voltage – 5V to 12V DC
Connector – 2.54mm Pitch Header (Pre-Soldered)
Module Size – 22 × 16mm

1: The key advantage of the LD2410C over a standard PIR sensor is detecting stationary human presence — it can sense the micro-movements of breathing, meaning lights and automations stay active even when someone is sitting still.

2: For simple on/off automations, use the digital OUT pin directly — it outputs a 3.3V HIGH signal when presence is detected and LOW when the area is clear, requiring no additional configuration or microcontroller library.

3: For fine-tuned control, connect via UART (256000 baud) and use the HLKRadarTool configuration software (or the ESPHome ld2410 component) to adjust sensitivity, detection gates, and the unmanned (no-presence) delay time per distance zone.

4: This is the most popular sensor for Home Assistant "room occupancy" automations specifically because it solves the classic PIR problem of lights turning off while someone is sitting motionless at a desk or on a couch.

5: Mount with a clear line of sight to the monitored area — large moving objects such as fans, curtains, or pets within range can occasionally trigger false detections; use the gate sensitivity settings to tune this out for your specific room.

6: Avoid mounting facing glass or highly reflective surfaces at a shallow angle, as reflections can extend or distort the effective detection pattern beyond the intended coverage area.