1. Introduzione
The HLK-LD2402 is a static human life sensor designed for precise detection of human presence, including motion and micro-motion. This module integrates a highly simplified 24 GHz sensor hardware with intelligent algorithm firmware. It features an AIoT millimeter wave sensor, high-performance 24 GHz transmitting and receiving antenna, and essential peripheral circuits. The human presence sensing algorithm utilizes millimeter-wave radar distance measurement technology and advanced proprietary radar signal processing to accurately perceive and report human presence in real-time within indoor environments.
2. Caratteristiche principali
- Equipped with a single-chip intelligent millimeter wave sensor SoC and intelligent algorithm firmware.
- Ultra-small sensor size: 20 mm x 20 mm.
- Load the default human body sensing configuration, enabling plug-and-play functionality.
- Operates in the 24 GHz ISM band, compliant with FCC, CE, and Committee-free spectrum regulations.
- Flexible power supply: 3.3 V, 5V, supporting a wide voltage range of 3.0 V ~ 3.6 V and 4.5 V ~ 5.5 V.
- Low average working current: 50 mA.
- Detects moving, fretting, and the presence of human bodies.
- Reports detection results in real-time.
- Maximum detection distance for human motion induction is 10 meters.
- Wide detection angle, covering up to 60 degrees.
- Supports various installation methods, including ceiling and wall mounting.
- Independently configurable trigger and hold states, offering strong anti-interference capabilities.
3. Specifiche tecniche
| Parametro | Valore |
|---|---|
| Numero di modello | Modello HLK-LD2402 |
| Nome del marchio | bibikoo (Hi-Link) |
| Origine | Cina continentale |
| Banda di frequenza operativa | 24-24.25 GHz |
| Maximum Sweep Bandwidth | 0.25GHz |
| Volume di fornituratage | 3.0V-3.6V (also 4.5V-5.5V wide range) |
| Misurare | 20 mm x 20 mm |
| Precisione di rilevamento | ±0.15 metri |
| Corrente media di lavoro | 50mA |
| Data Refresh Cycle | 165 millisecondi |
| Metodo di comunicazione | TTL Serial Communication |
| Fotocamera fornita | NO |
| Compatibilità | Altri |
| Potenza di trasmissione | 13dBm |
| Distanza di rilevamento | 6m (adjustable) |
| Angolo di rilevamento | ±60° |
| Tipo di uscita | Serial protocol / High and low levels |
| Dimensioni del prodotto | 20*20 mm |
| Temperatura di esercizio | -40℃ ~ 85℃ |
4. Configurazione e connessione
The HLK-LD2402 module is designed for straightforward integration. It features five pin holes (J2) for power supply and communication, and a separate J1 interface for MCU program burning and debugging. The pin spacing is compatible with both 2.54mm and 2.00mm jack spacing.
4.1 Diagramma di pinout
J2 Interface (Power & Communication):
- Pin 1 (V): Power Supply Input (3.0V-3.6V or 4.5V-5.5V)
- Pin 2 (IO): General Purpose Input/Output (High/Low Level Output)
- Pin 3 (GND): Terra
- Pin 4 (TX): Serial Data Transmit
- Pin 5 (RX): Serial Data Receive
J1 Interface (SWD): Used for MCU program burning and debugging. Specific pin functions for J1 are typically for advanced development and debugging, including SWDIO, SWCLK, Reset, and VCC/GND connections.
4.2 Collegamento Esamples
The module can be connected using standard DuPont lines or integrated into a test kit for easier development.
5. Funzionamento
The HLK-LD2402 module operates as a human body stationary micro-motion sensor, primarily communicating via TTL serial communication. It provides real-time detection results and can output high or low logic levels based on detection events.
5.1 Principio di rilevamento
The module uses 24G millimeter wave radar technology to detect subtle movements, including micro-motion (like breathing) and static presence of a human body. The intelligent algorithm processes the radar signals to differentiate between various states of human presence.
5.2 Serial Communication (TTL)
Connect the module's TX and RX pins to a compatible TTL serial interface (e.g., a microcontroller's UART or a USB-TTL converter connected to a computer). The module will transmit detection data through its TX pin. Refer to the module's specific communication protocol documentation (not provided here) for details on data format and commands.
5.3 IO High and Low Level Output
The IO pin can be configured to provide a high or low logic level output based on detection events. This can be used to trigger external circuits or indicate presence/absence without needing to parse serial data. The specific behavior (e.g., high on detection, low on no detection) is typically configurable via the module's firmware settings.
5.4 Configurazione
The module supports independent configuration of trigger and hold states. This allows for fine-tuning the sensitivity and response time to suit different application requirements and minimize false positives due to transient events. Configuration details are typically accessed via serial commands.
6. Manutenzione
- Pulizia: Keep the module clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using liquids or abrasive materials.
- Ambiente: Operate the module within its specified operating temperature range (-40℃ to 85℃). Avoid exposure to extreme temperatures, high humidity, or corrosive environments.
- Danni fisici: Handle the module with care to prevent physical damage to the PCB, antennas, or components.
- Alimentazione elettrica: Garantire un'alimentazione stabile entro il volume specificatotage range (3.0V-3.6V or 4.5V-5.5V) to prevent damage.
7. Risoluzione Dei Problemi
| Problema | Possibile causa | Soluzione |
|---|---|---|
| No detection or inconsistent detection | Incorrect power supply; Obstructions in detection area; Module not properly oriented; Environmental interference. | Verificare alimentazione voltage; Ensure clear line of sight for the module; Adjust module orientation for optimal coverage; Minimize sources of electromagnetic interference. |
| No serial data output | Incorrect wiring (TX/RX swapped); Incorrect serial port settings (baud rate, parity, stop bits); Module not powered on. | Check TX/RX connections; Confirm serial port settings match module requirements; Ensure module is powered correctly. |
| IO output not responding | IO pin not configured correctly; External circuit issue; Module not detecting presence. | Review firmware configuration for IO pin behavior; Check external circuit connections; Verify module is detecting presence via serial output. |
| False rilevazioni | Vibrations; Air currents; Nearby moving objects; High sensitivity settings. | Mount the module securely to minimize vibrations; Avoid placing near fans or vents; Adjust sensitivity settings (trigger/hold states) via serial commands. |
8. Suggerimenti per l'utente
- For initial setup and testing, consider using a USB-TTL converter (like those found in Test Kit-B) to easily interface the module with a computer and monitor serial output.
- Experiment with different mounting heights and angles to optimize the detection area for your specific application. The 60-degree detection angle provides flexibility.
- If experiencing false positives, try adjusting the trigger and hold state parameters through serial commands. This can help filter out minor environmental disturbances.
- Ensure the power supply is stable and within the recommended voltage range to guarantee reliable operation and prevent damage to the module.
9. Garanzia e supporto
For warranty information, technical support, or further inquiries regarding the HLK-LD2402 module, please contact Shenzhen Hi-Link Electronic Co., Ltd. directly. Refer to the seller's official website or contact details provided at the point of purchase for the most up-to-date support information.