EC Buying LD2412 Human Presence Sensor Module Instruction Manual

1. Úvod

The EC Buying LD2412 is a 24G wide-angle millimeter wave radar sensor module designed for human presence detection. It utilizes Frequency Modulated Continuous Wave (FMCW) technology to accurately detect human targets, distinguishing between moving and stationary states within a defined space. This module provides high-sensitivity sensing and can calculate auxiliary information such as target distance. It is primarily intended for indoor scene perception applications, offering real-time detection results.

Key features include a maximum sensing distance of 9 meters, a distance resolution of 0.75m, and a wide detection angle of ± 75°. The module supports both GPIO and UART connections, allowing for flexible integration into various intelligent systems and terminal products. A visual configuration tool is available to customize parameters such as sensing distance range, sensitivity levels, and unmanned delay time.

2. Nastavení a připojení

This section details the physical setup and electrical connections for the LD2412 module.

2.1 napájecí zdroj

The LD2412 module can be powered by either 3.3V or 5V. Ensure the power supply capacity is greater than 200mA to guarantee stable operation. The module typically consumes around 90mA.

2.2 Definice pinů

The module features several pins for power, communication, and output:

• VEN: Target status output pin. By default, it outputs a high level when human presence is detected and a low level when no human presence is detected. This behavior can be configured via instructions.
• TX: Serial port transmit pin.
• RX: Serial port receive pin.
• + 5V: 5V power supply input. Choose either +5V or 3V3 for power.
• 3V3: 3.3V power supply input. Choose either +5V or 3V3 for power.
• GND: Uzemnění napájení.

2.3 Module Orientation

Obrázek 1: Nahoře view of the LD2412 module, showing the main chip and pin headers for connection.

Obrázek 2: Spodní část view of the LD2412 module, illustrating the integrated radar antennas and the S3KM1110 chip.

Obrázek 3: Nahoře view of the LD2412 module without pin headers, providing a clearer view of the circuit board components.

3. Návod k obsluze

The LD2412 module operates by emitting 24G millimeter waves and analyzing the reflected signals to detect human presence. It can differentiate between subtle micro-movements and larger motions.

3.1 Princip detekce

The module uses FMCW to continuously sweep frequencies, allowing it to detect changes in the environment caused by human presence. Its advanced algorithm processes these radar signals to achieve high-sensitivity detection.

3.2 Konfigurační nástroj

A visual configuration tool is provided to customize the module's behavior. This tool allows users to:

• Adjust the sensing distance range (0.75m to 9m).
• Set sensing sensitivity for different detection intervals.
• Configure the unmanned delay time, which determines how long the module waits before indicating no presence after a person leaves the detection zone.

Refer to the manufacturer's documentation for detailed instructions on using the configuration tool. Note that some users have reported the configuration tool may be Windows-only.

3.3 Output Interpretation

The OUT pin provides a simple high/low level output indicating presence. For more detailed information, such as target distance, use the UART interface to communicate with the module and interpret its serial data output.

4. Specifikace

Detailed technical specifications for the LD2412 Human Presence Sensor Module:

5. Údržba

The LD2412 module is designed for robust operation with minimal maintenance. To ensure longevity and optimal performance:

• Podmínky prostředí: Operate the module within the specified environmental temperature range of -40°C to +85°C.
• Ochrana: Avoid exposing the module to excessive moisture, dust, or corrosive substances.
• Zacházení: Handle the module with care to prevent physical damage to the components or pins.
• Čištění: If necessary, gently clean the module with a dry, soft cloth. Do not use liquid cleaners.

6. Řešení problémů

This section addresses common issues and potential solutions for the LD2412 module.

6.1 No Detection or Inconsistent Detection

• Napájení: Verify that the module is receiving the correct voltage (3.3V or 5V) and that the power supply can provide sufficient current (>200mA).
• Orientace modulu: Ensure the module is positioned correctly, with the detection area facing the desired zone. Obstructions can interfere with radar signals.
• Konfigurace: Use the visual configuration tool to check and adjust the sensing distance range and sensitivity settings. The default parameters might not be optimal for all environments.
• Environmentální faktory: Large metallic objects or strong electromagnetic interference in the vicinity can affect radar performance.

6.2 Communication Issues (UART)

• Přenosová rychlost: The default baud rate for the LD2412 is 115200. Ensure your serial communication setup matches this rate. (Note: Older modules like LD2410 might use 256000 baud).
• Zapojení: Double-check the TX and RX connections between the module and your microcontroller/computer. TX of one device should connect to RX of the other, and vice-versa.
• Logické úrovně: The output serial port level is 3.3V. Ensure your receiving device is compatible with 3.3V logic or use a level shifter if necessary.

6.3 Software/Library Compatibility

• New Module: The LD2412 is a relatively new module. Dedicated Arduino or other platform libraries might not be fully developed or widely available yet. You may need to adapt existing libraries or implement communication protocols based on the official datasheet.
• Configuration Tool OS: The official configuration tool may require a Windows operating system. Consider this if you are using other operating systems.

7. Informace o podpoře

For further assistance, technical documentation, or inquiries regarding the EC Buying LD2412 Human Presence Sensor Module, please refer to the official EC Buying store or contact their customer support channels. Up-to-date resources, including datasheets and configuration tool downloads, are typically available from the manufacturer.