Check the listing for details. Detection Millimetre Wave Radar Module LD2420 24GHz Radar Human Presence Sensor. Condition: New. Listed at 4.96 USD. LD2420 24GHz Radar Human Presence Sensor Detection Millimetre Wave Radar Module Replacement IR Supports Smart Light/Fan/Switch Product DescriptionLD2420 is a 24GHz human presence sensing module, the working principle is to use FMC W FM continuous wave to detect human targets in the set space, combined with radar signal processing, accurate human presence sensing algorithms, to achieve high sensitivity human presence sensing, and can accurately perceive the human body in the movement and micro-movement state.Mainly used in indoor scenarios, sensing whether there is a moving or slightly moving human body in the area, and outputting the results in real time.Provides configuration tools to modify the sensing distance range, sensing sensitivity and unoccupied delay time.Support GPIO and UART output, plug and play, can be flexibly applied to different intelligent scenes and terminal products.Interface type: (2.54mm×5PIN)1: VCC, 3.3V power input2: GND, power ground3: OT1, TX, serial port transmitter4: RX, serial port receive5: OT2, sense output high levelDefault baud rate 115200, 1 stop bit, no parity bit.