How to Use LD2410C: Examples, Pinouts, and Specs

The LD2410C (manufacturer part ID: HLK-LD2410C) is a low-power, high-performance microwave motion detector IC developed by Hi-Link. Operating in the 24 GHz frequency range, this component is designed for motion detection in security, automation, and smart home applications. It features a built-in antenna, simplifying integration into various systems and reducing the need for external RF components.

• Security systems (e.g., motion-activated alarms)
• Smart lighting and home automation
• Occupancy detection in offices and buildings
• Industrial automation and robotics
• Energy-saving systems (e.g., HVAC control)

The LD2410C module has a simple pinout for easy integration into circuits. Below is the pin configuration:

1. Power Supply: Connect the VCC pin to a stable 5V DC power source and the GND pin to ground.
2. UART Communication: Use the TX and RX pins to interface with a microcontroller or computer for data communication. Ensure the UART baud rate matches the module's default setting (115200 bps).
3. Enable Pin: Optionally, connect the EN pin to a GPIO pin on your microcontroller to enable or disable the module programmatically.
4. Detection Range Adjustment: The detection range can be configured via UART commands. Refer to the manufacturer's protocol documentation for details.

• Placement: Install the LD2410C in a location free from obstructions to maximize detection accuracy.
• Power Supply: Use a regulated 5V power source to avoid voltage fluctuations that could affect performance.
• Interference: Avoid placing the module near other high-frequency devices to minimize interference.
• UART Configuration: Ensure the microcontroller's UART settings (baud rate, parity, etc.) match the LD2410C's default configuration.

Below is an example of how to connect and use the LD2410C with an Arduino UNO:

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial ld2410Serial(2, 3); // RX = Pin 2, TX = Pin 3

void setup() {
  Serial.begin(9600); // Initialize Serial Monitor
  ld2410Serial.begin(115200); // Initialize LD2410C UART communication

  Serial.println("LD2410C Motion Detector Initialized");
}

void loop() {
  // Check if data is available from the LD2410C
  if (ld2410Serial.available()) {
    String data = "";
    while (ld2410Serial.available()) {
      char c = ld2410Serial.read();
      data += c; // Read incoming data
    }
    Serial.println("Motion Data: " + data); // Print data to Serial Monitor
  }

  delay(100); // Small delay to avoid flooding the Serial Monitor
}

Note: If the LD2410C's TX pin outputs 5V logic, no voltage divider is needed. If it outputs 3.3V logic, ensure the Arduino UNO can read 3.3V signals reliably.

1. No Motion Detected:

   • Ensure the module is powered correctly (check VCC and GND connections).
   • Verify the detection range settings via UART commands.
   • Check for obstructions in the detection area.

2. UART Communication Fails:

   • Confirm the baud rate is set to 115200 bps on both the LD2410C and the microcontroller.
   • Check the wiring of the TX and RX pins. Ensure they are not swapped.
   • Use a logic level converter if interfacing with a 3.3V microcontroller.

3. Interference or False Triggers:

   • Relocate the module away from other RF-emitting devices.
   • Reduce the detection range to minimize environmental noise.

Q: Can the detection range be adjusted?
A: Yes, the detection range can be configured via UART commands. Refer to the manufacturer's protocol for details.

Q: Is the LD2410C suitable for outdoor use?
A: The module operates in a wide temperature range (-40°C to +85°C), but it is not waterproof. Use a protective enclosure for outdoor applications.

Q: What is the default UART baud rate?
A: The default UART baud rate is 115200 bps.

Q: Can the LD2410C detect stationary objects?
A: No, the LD2410C is designed for motion detection and cannot detect stationary objects.

Q: Does the module require an external antenna?
A: No, the LD2410C has a built-in antenna, simplifying integration into your project.