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HLK-LD2411 24Ghz Radar Motion Detection Sensor Module
HLK-LD2411 24Ghz Radar Motion Detection Sensor Module
LD2411 is a human distance detection and gesture recognition module. In addition to recognizing the user's lifting and dropping movements, it can detect the user's movement in and out of the toilet and send GPIO signals through the detected movements, enabling the manufacturer's microcontroller to control the opening or closing of the toilet lid.
The module uses 5V supply and the radar beam is wide. and is designed narrowly, with approximately ±20° horizontal angle (4 patches) and ±40° vertical angle, with adjustments made depending on the placement direction of the antenna. In toilet applications, a narrow horizontal beam is recommended to prevent false triggering of the human body passing there.
Technical Specifications
- Plug and play, easy installation. method
- Detection distance up to 2 meters, motion recognition distance up to 1 meter
- Detection angle coverage up to ±30 degrees
- Distance detection distance adjustable via Bluetooth
Pinout
- VCC: 5V operating voltage
- GND
- OUT
- TXD: Serial port emission/IO
- RXD: Serial port receiving/IO
Induction range diagram
Module installation mode is recommended in the toilet application to the horizontal narrow beam to avoid false triggering of the human body passing.
The toilet seat has five states : 
Distance Detection Usage:
Walk in: with the module in the center, the human body facing the module, walk to reach the lower threshold setting distance, RX pin output high level, TX low level, takes about 1~2 seconds
Away: The body faces the module and It walks backwards, after reaching the upper threshold setting distance, TX pin outputs high level and RX low level for about 1~2 seconds.
