4pcs LD2420 Human Presence Radar Sensor Module HLK-LD2420 LD2420 Millimeter Wave Non-Contact 24GHz ISM Band Serial Port IO Level Output

Features: Frequency: 24 GHz–24.25 GHz Modulation: FMCW Detection range: Adjustable from 0.75 to 6 m Detection angle: ±60° Power supply: 3.3 V (typ.) Current: ~50 mA Output Serial Port Level: 3.3V Sweep Bandwidth: 250 MHz (Compliant with CE/FCC certification standards) Operating Temperature: -40°C to +85°C Data Format: Serial ASCII output / High/Low levels 3.3V & 0V Interface Type: (2.54mm x 5-pin header) 1: VCC, 3.3V power supply input 2: GND, power ground 3: OT1, sensing output (high level) 4: RX, TTL serial port receive 5: OT2, TX, TTL serial transmission Default baud rate: 256000, 1 stop bit, no parity bit. Configuration Tool Instructions: After connecting the module, open the configuration tool. Before clicking the Start button, or after starting and clicking Stop, you can read or set the mode parameters. Note: The serial port tool and the host computer tool cannot be used simultaneously.

• ★The LD2420 is a 24GHz human presence detection module that operates by using Frequency-Modulated Continuous Wave (FMCW) to detect human targets within a defined space. Combining radar signal processing with precise human detection algorithms, it achieves highly sensitive human presence detection and can accurately detect humans even when they are moving or making slight movements.
• ★Primarily designed for indoor applications, it detects whether there is movement or subtle motion within the sensing area and outputs results in real time. A configuration tool is provided to adjust the sensing range, sensitivity, and no-motion delay time. It supports GPIO and UART output, is plug-and-play, and can be flexibly applied to various smart scenarios and end-user products.
• ★Both ceiling-mounted and wall-mounted installation options are supported; ceiling-mounted installation is recommended. When installing the unit on the wall, you need to take into account external factors such as air conditioners and electric fans mounted on the ceiling.
• ★If the radar requires an enclosure, the enclosure must have good wave-transmitting properties in the 24 GHz band and must not contain metal or materials that shield electromagnetic waves.
• ★The detection zone contains non-human objects in constant motion, such as animals, curtains that are constantly fluttering, or large potted plants positioned directly in front of the air vent. The detection zone contains large, highly reflective surfaces; highly reflective objects positioned directly in front of the radar antenna can cause interference.