{"product_id":"hlk-ld2420-24ghz-human-presence-sensor","title":"HLK-LD2420 24GHz Human Presence Radar Sensor Module","description":"\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHi-Link HLK-LD2420\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a compact 24GHz FMCW mmWave human presence radar sensor designed to detect moving and micro-motion human targets. It operates from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, supports UART and GPIO status output, offers configurable detection zones and sensitivity, and can detect moving targets at distances up to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in wall-mounted applications.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDescription\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420 24GHz Human Presence Radar Sensor Module\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is designed for smart-home, lighting, security, occupancy sensing, automation, and AIoT applications where reliable human-presence detection is required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnlike a basic PIR motion sensor, the HLK-LD2420 uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24GHz FMCW millimeter-wave radar technology\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e together with onboard signal processing to detect human movement and micro-motion within a configurable sensing area. The module can continuously report detection results and allows parameters such as detection distance, zone sensitivity, and reporting behavior to be adjusted through Hi-Link's configuration software.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor wall-mounted operation, the manufacturer specifies a maximum moving-person detection distance of approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and micro-motion detection up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. The sensing angle can reach approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e±60°\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, depending on mounting, environment, target movement, and configuration.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe actual Chip.pk stock is marked \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420 V2.1\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. It uses a compact \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e20 × 20mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e PCB and provides a 5-pin power\/communication interface for integration with microcontrollers, controllers, and embedded systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003eHi-Link \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eActual stock PCB revision: \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eV2.1\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e24GHz FMCW mmWave radar\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHuman presence, movement, and micro-motion detection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMoving-person detection up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with wall mounting\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eMicro-motion detection up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with wall mounting\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eDetection coverage up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e±60°\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eNear-range sensing down to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.2m\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eConfigurable sensing distance and zone sensitivity\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUART communication interface\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDedicated presence-status GPIO output\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReal-time detection reporting\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eApprox. \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e10Hz\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e data refresh rate\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eNominal \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e operation\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eCompact \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e20 × 20mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e module size\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSuitable for smart lighting, occupancy detection, automation, and security applications\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eTechnical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBrand\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHi-Link\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHLK-LD2420\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePCB Revision\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eV2.1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSensor Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eHuman Presence Radar Sensor\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRadar Technology\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFMCW mmWave\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Frequency\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24.0–24.25GHz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMaximum Sweep Bandwidth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e250MHz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSupply Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.0–3.6V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTypical Supply Voltage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.3V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAverage Operating Current\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 50mA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWall-Mount Moving Detection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to approx. 8m\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWall-Mount Micro-Motion Detection\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to approx. 6m\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCeiling-Mount Moving Coverage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 5m diameter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCeiling-Mount Micro-Motion Coverage\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 4m diameter\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMinimum Detection Distance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 0.2m\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDetection Angle\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUp to approx. ±60°\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDistance Accuracy\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. ±0.35m reference value for moving targets within 8m\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eData Refresh Rate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eApprox. 10Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCommunication\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUART\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePresence Status Output\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGPIO High \/ Low\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eUART Logic Level\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0–3.3V\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModule Size\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20 × 20mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40°C to +85°C\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHeader Pitch\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.54mm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003eManufacturer specifications for sensing distance, angle, accuracy, current, refresh rate, voltage, and dimensions are documented in the current HLK-LD2420 user manual. \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/r0.hlktech.com\/download\/HLK-LD2420-24G\/1\/HLK-LD2420%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C%28V1.3.2%29.pdf?utm_source=chatgpt.com\"\u003er0.hlktech.com\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInterface \/ Pinout\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe official Hi-Link manual defines the main 5-pin J2 connector as:\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003ePin\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003e\u003cspan\u003eOfficial Function\u003c\/span\u003e\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePin 1\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3V3 Power Input\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePin 2\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eGND\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePin 3\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOT1 \/ UART_TX\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePin 4\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRX \/ UART_RX\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePin 5\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOT2 \/ Presence Status Output\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003eThe OT2 output goes \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ehigh when human presence is detected\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and low when no presence is detected. The official interface operates at 3.3V logic levels. \u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/h.hlktech.com\/download\/HLK-LD2420-24G\/1\/HLK-LD2420%E7%94%A8%E6%88%B7%E6%89%8B%E5%86%8C%28V1.3.2%29.pdf\"\u003eHailinke Support Center\u003c\/a\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStock marking note:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e the supplied V2.1 PCB imagery labels the signal pins as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eIO1 \/ RX \/ IO2\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while the current Hi-Link manual refers to the corresponding functional pins as \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eOT1 \/ RX \/ OT2\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Chip.pk should describe the functions according to the official manual rather than guessing from the abbreviated PCB labels.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eApplications \/ Use Cases\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHuman presence detection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSmart lighting control\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRoom occupancy sensing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSmart home automation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEnergy-saving systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic display wake\/sleep systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBuilding automation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSecurity and access systems\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSmart switches\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAIoT occupancy sensing\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIndoor monitoring\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAppliance presence control\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMicro-motion detection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEmbedded radar sensing projects\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe HLK-LD2420 can be integrated with microcontrollers and embedded control systems through its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V UART interface and GPIO presence-status output\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt may be used with platforms such as ESP32, STM32, Arduino-compatible controllers, PLC-interface circuitry, or custom embedded boards, provided their electrical interface is compatible.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe module itself uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V logic\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Do not assume direct compatibility with a 5V UART or GPIO system without checking the controller's electrical specifications or using suitable level conversion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor configuration through a computer, Hi-Link documents use of a USB-to-TTL serial adapter and a UART baud rate of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e115200\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with its configuration utility.\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDetection performance can vary with mounting position, room layout, moving objects, reflective materials, sensitivity settings, and environmental conditions. Manufacturer maximum-range values should therefore be treated as application-dependent rather than guaranteed in every installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003ePackage Contents\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003cspan\u003e1 × HLK-LD2420 24GHz Human Presence Radar Sensor Module\u003c\/span\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eBuy in Pakistan\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBuy the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420 24GHz human presence sensor in Pakistan\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e from \u003ca href=\"https:\/\/www.chip.pk\/\"\u003eChip.pk\u003c\/a\u003e for smart lighting, occupancy sensing, automation, security, and AIoT projects.\u003c\/span\u003e\u003cspan\u003eWith \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24GHz FMCW radar, up to 8m moving-person detection, micro-motion sensing, UART configuration, GPIO presence output, and adjustable detection parameters\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the LD2420 provides a compact alternative to conventional motion-only sensing solutions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFAQs\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e1. What is the HLK-LD2420 sensor?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a 24GHz FMCW mmWave human presence radar sensor designed to detect human movement and micro-motion for occupancy, automation, smart lighting, and monitoring applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e2. What is the maximum detection range of the LD2420?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eFor wall-mounted applications, Hi-Link specifies moving-person detection up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e8m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and micro-motion detection up to approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e6m\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Actual range depends on mounting, environment, sensitivity settings, and target movement.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e3. Can the LD2420 detect a stationary person?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe module is designed to detect human presence including \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003emicro-motion\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, allowing it to detect much smaller movements than a conventional motion-only PIR sensor. Completely motionless detection performance depends on installation and configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e4. What frequency does the HLK-LD2420 use?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eIt operates in the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24.0–24.25GHz\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e millimeter-wave radar band.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e5. What voltage does the LD2420 require?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe module operates from approximately \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.0V to 3.6V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e as the typical supply voltage.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e6. Does the LD2420 support UART communication?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes. It provides a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V UART interface\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e that can be used for configuration and data communication.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e7. Does the module provide a simple presence output?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes. A dedicated digital presence-status output is provided. The output changes state according to whether human presence is detected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e8. Can I use the LD2420 with ESP32?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes. It can be interfaced with an ESP32 using its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V UART and GPIO signals\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, provided the wiring and firmware are configured correctly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e9. Can I use the LD2420 with Arduino?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes, but the LD2420 uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e3.3V logic\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. If the selected Arduino board uses 5V UART or GPIO levels, suitable level shifting may be required.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e10. Is the LD2420 the same as a PIR motion sensor?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eNo. PIR sensors detect changes in infrared radiation, while the LD2420 uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24GHz FMCW radar\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and can detect movement and micro-motion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e11. Can the detection distance and sensitivity be adjusted?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eYes. Hi-Link provides configuration options for detection zones, sensitivity, and reporting parameters through the module's serial interface and configuration software.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e12. What is the PCB version of the Chip.pk stock?\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eThe supplied Chip.pk stock shown in the product images is marked \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHLK-LD2420 V2.1\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Chip.pk","offers":[{"title":"Default Title","offer_id":67822680441117,"sku":null,"price":1200.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0998\/1060\/7389\/files\/HLK-LD2420_24GHz_Human_Presence_Radar_Sensor_Module_Front.webp?v=1792399779","url":"https:\/\/www.chip.pk\/products\/hlk-ld2420-24ghz-human-presence-sensor","provider":"Chip.pk","version":"1.0","type":"link"}