HLK-LD2410C Human Motion/Presence Detection Radar Sensor (HCSENS0051)

[admin]

LD2410C is a high-sensitivity 24GHz human presence status sensing module developed by Hi-link. Its working principle is to use FMCW frequency-modulated continuous waves to detect human targets in the set space. Combined with radar signal processing and precise human body sensing algorithms, it realises high-sensitivity human presence status sensing, and can identify human bodies in motion and stationary states. And auxiliary information such as the distance of the target can be calculated.

This product is mainly used in indoor scenes to sense whether there is a moving or micro-moving human body in the area, and output the detection results in real time. The farthest sensing distance can reach 5 meters, and the distance resolution is 0.75m.

The module has a single digital detection output pin that momentarily pull high when motion and/or presence is detected. This makes the module similar in operation to most PIR or other radar detectors and allows the module to be interfaced to microcontrollers with just 1 input pin.

Out of the box the module will detect both motion and presence at maximum range and sensitivity. However (as well as other parameters), the detection sensitivity over its 5M range can be changed in 0.75m segments via its serial interface and a Windows based software tool.


Please note: If you wish to change the modules default parameters you will need a Windows based computer and a USB to serial TTL adapter such as one of the following:

https://hobbycomponents.com/usb-interfa ... al-adaptor
https://hobbycomponents.com/usb-interfa ... rt-adapter


Product parameters
Plug and play, easy assembly
The longest sensing distance is up to 6 metres
Large detection angle, coverage up to ±60 degrees
Accurate identification within the interval, support the division of the sensing range, and shield the interference outside the interval
Multi-level intelligent parameter adjustment to meet the needs of scene changes
Visual debugging and configuration tools
Small and simplified, the minimum size is only 16mmx22mm
Supports various installation methods such as ceiling hanging and wall hanging
24GHz ISM band, compliant with FCC and CE spectrum regulations
5～12V wide voltage power supply
The ultimate cost-effective choice



Pinout

Tx..........Serial output pin used for configuration via Windows software
Rx..........Serial input pin used for configuration via Windows software
OUT........Detection output pin (high = motion and/or presence detected)
GND........Ground
VCC........5 to 12V (average current = 80mA at 5V), 5V recommended

Dimensions





Windows Software Config Tool





Arduino Connection Example







Windows configuration software:

LD2410 Tool EN.zip

PLEASE NOTE: Mac & Linux operating systems are not currently supported


3D Step File:

HLK-LD2410_3D_V1.3_Step_File.zip

Documentation (Chinese):

HLK LD2410_Manual_Chinese.pdf

LD2410_Protocol_Chinese.pdf

LD2410_Design_Guide_Chinese.pdf

Libraries, example code, and diagrams are provided as an additional free service by Hobby Components and are not sold as part of this product. We do not provide any guarantees or warranties as to their accuracy or fitness for purpose.

Descriptions and diagrams on this page are copyright Hobby Components Ltd and may not be reproduced without permission.

[Radian]

Just bought some of these from the shop and the ESP home integration is working well. One thing I can't figure out is how to read the light sensor output (there's a CdS photoresistor on the HLK-LD2410C PCB and there's a parameter for Light Threshold in the ESP Home Configuration card but no other mention).

The datasheet doesn't seem to mention it as part of the protocol either - or I might be being blind. It would be super useful to have the local light level at the sensors location so I'd really like to find this out.

[andrew]

Just bought some of these from the shop and the ESP home integration is working well. One thing I can't figure out is how to read the light sensor output (there's a CdS photoresistor on the HLK-LD2410C PCB and there's a parameter for Light Threshold in the ESP Home Configuration card but no other mention).

My understanding of the light sensor is that under normal operation it is used to control the output pin on the module. You can set a threshold light level and use that to either inhibit or enable the operation of the output pin. So for example you configure it so that the output pin only triggers when motion and dark.

However, I believe you can access the light level via the serial interface when in engineering mode. I’ve not tested it myself but this can be enabled in the ESPHome configuration file:

https://esphome.io/components/sensor/ld2410.html


Here is the relevant sections:

Configuration variables:
light (Optional, int): When in engineering mode, indicates the light sensitivity, otherwise unknown. Value between 0 and 255 inclusive. Though it seems that the value 85 is the lowest value at complete darkness. All options from Sensor.

Code: [Select all] [Expand/Collapse]

1. switch:
2.   - platform: ld2410
3.     engineering_mode:
4.       name: "engineering mode"

GeSHi © Codebox Plus Extension

engineering_mode (Optional): enable/disable engineering mode. Defaults to false. Notice this requires more resources and is not recommended to be enabled when not necessary. All options from Switch.