LD2410B High Sensitivity 24GHz Human Presence Sensor

LD2410B is a high-sensitivity 24GHz human presence status sensing module developed by Hilink Electronics. Its working principle is to use FMCW (Frequency-Modulated Continuous Wave) to detect human targets in the set space. Combined with radar signal processing and accurate human body sensing algorithms, it realizes 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. Provides a visual configuration tool, which can easily configure the sensing distance range, sensing sensitivity in different intervals and unmanned delay time, etc., to adapt to different specific application needs.

Support GPIO and UART output, plug and play, and can be flexibly applied to different smart scenarios and terminal products.

Application scenarios:

• Human body sensor light control
• Human body induction wake-up of advertising screen and other equipment
• Life safety protection
• Smart home appliances
• Intelligent security

24GHz Radar Presence Detector Explain by Andreas Spiess

Solution advantages:

The LD2410B human body sensing module adopts 24GHz millimeter wave radar sensor technology. Compared with other solutions, it has obvious advantages in human body sensing applications:

1. In addition to being sensitive to moving human bodies, it can also sensitively sense static, micro-moving, sitting, and lying human bodies that cannot be identified by traditional solutions.
2. It has good environmental adaptability, and the sensing effect is not affected by the surrounding environment, such as temperature, brightness, humidity, and light fluctuations.
3. It has good shell penetration and can be hidden in the shell to work without opening holes on the surface of the product, which improves the aesthetics of the product.
4. It can flexibly configure the farthest sensing distance and the sensitivity on each distance door to achieve flexible and fine personalized configuration.
5. With the Bluetooth function, you can directly use the APP to debug the radar parameters without catching the serial port.

The module must be powered by 5V or higher but does 3.3v I/O. Please consider this when working with the module.

The default header pitch is 1.27mm, half the size of the usual 0.1" hobbyist pin headers, so you may need to buy some or carefully de-solder the existing pins to use the module. 

Mounting method and sensing range:

Celling-mounted Installation

Wall-mounted Installation

If compared to the LD2410, this LD2410B comes with integrated Bluetooth on the module.

Currently, the APP supports Android and IOS platforms; you can download it from this link: https://www.pgyer.com/Lq8p (Android). You can also go to major app stores to search for "HLKRadarTools" and install it. Please refer to the User Manual for more instructions.
 

• Plug and play, easy assembly
• The longest sensing distance is up to 5 meters
• Large detection angle, coverage up to ±60 degrees
• Accurate identification within the interval supports the division of the sensing range and shield the
• interference outside the interval
• Multi-level intelligent parameter adjustment can be realized through Bluetooth or serial port to meet the needs of scene changes
• Visual debugging and configuration tools
• Small and simple, the minimum size is only 7mmx35mm
• Supports various installation methods such as ceiling hanging and wall hanging
• 24GHz ISM band can be certified by FCC and CE spectrum regulations
• The ultimate cost-effective choice

Specification:

• Manufacturer: Hi-Link
• Model: LD2410B
• Frequency Band: 24 – 24.25GHz
• Modulation: FMCW (Frequency Modulated Continuous Wave)
• Frequency Sweep Bandwidth: 250MHz (In line with FCC and CE Certification Standards)
• Sensing Distance: 0.75 – 5 Meters
• Resolution: 0.75 Meters
• Sensing Angle: ± 60 Degrees
• Operating Voltage Range: 5 – 12VDC
• Output and Logic Level Voltage: 3.3VDC
• Operating Current: ~79mA
• Operating Temperature Range: -40°C to +85°C
• Communication Protocol: UART (Default Baud Rate = 256000 / 1 Stop bit / No Parity bit)
• Header Pin Pitch: 1.27mm
• Dimensions: ~(35mm x 7mm)

Pin Description:

• 1. OUT-> Digital Output (HIGH if the human body is detected, otherwise LOW)
• 2. UART_TX-> UART TX Pin
• 3. UART_RX-> UART RX Pin
• 4. GND-> Ground
• 5. VCC-> Supply Voltage (5 – 12VDC)

• 1 x Hi-Link LD2410B Sensor Radar Module
• 1 x Cable

• LD2410B 3D CAD
• LD2410B User Manual (EN) V1.04
• LD2410B User Manual (CH) V1.07
• HLK LD2410B Serial Communication Protocol (EN) V1.07 - Translated
• HLK LD2410B Serial Communication Protocol (CH) V1.07
• LD2410B Full Resources Page (Includes Configuration Tool Download Link from Hi-Link), EN version

Useful Reference:

• Github by ncmreynolds
• ESPHome