4pcs LD2402 Human Presence Radar Sensor Module HLK-LD2402 LD2402 Millimeter Wave Non-Contact 24GHz ISM Band Serial Port IO Level Output

Faetures: Frequency: 24.0–24.25 GHz Sweep bandwidth: 250 MHz Modulation method: FMCW Detection angle: ±60° Detection range: 5 m (stationary & slight movement) / <8–10 m (motion) (Typ.) Distance resolution: 0.15 m (Typ.) Supply Voltage: 3.3V (Typ.) Dimensions: 20x20mm Operating Temperature: -40°C to +85°C Data Format: Serial ASCII Output Interface: Default 2.54mm × 5-pin Connector Type: (2.54 mm x 5-pin) 1: V, 3.3 V power input 2: 10, UART receive 3: G, Ground 4: T, UART_TX 5: R, UART_TX

• ★The LD2402 is a 24 GHz millimeter-wave radar module designed for human presence detection. It operates by using FMCW (Frequency-Modulated Continuous Wave) technology to detect human targets within a defined space. Combined with radar signal processing and precise human detection algorithms, it achieves highly sensitive human presence detection and can identify humans whether they are moving or stationary.
• ★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.
• ★Large, highly reflective surfaces within the detection area, or highly reflective objects directly facing the radar antenna, can cause interference. When mounting the device on a wall, external interference sources such as air conditioners and electric fans on the ceiling must be taken into account.
• ★Ensure that there is no movement or vibration behind the radar. Because radar waves are penetrating, the antenna’s sidelobes may detect moving objects behind the radar. A metal shielding enclosure or metal backplate can be used to shield the radar’s sidelobes and reduce the impact of objects behind the radar. When multiple 24 GHz band radars are present, do not align their beams directly with each other; install them as far apart as possible to avoid potential mutual interference.
• ★Applications: The product is suitable for a wide range of AIoT scenarios, including smart lighting control, digital signage activation, personal safety protection, energy-saving smart home appliances, and security intrusion detection.