LD2410C 24GHz mmWave Human Presence Radar Sensor

The LD2410C is a high-sensitivity 24GHz millimeter-wave (mmWave) radar module designed for advanced human presence detection. Unlike traditional PIR sensors that only detect movement, this FMCW (Frequency-Modulated Continuous Wave) radar can sense the tiny chest movements of a stationary person (breathing), making it the ultimate solution for "smart room" occupancy.

Why choose mmWave over PIR?

• Stationary Presence: Detects sitting, standing, and even lying down. Your lights will never turn off while you're reading or watching TV again.
• Environmental Immunity: Not affected by temperature, light, smoke, or humidity.
• Invisible Installation: The radar can penetrate plastic shells and glass, allowing it to be hidden inside a project box or behind a thin wall for a clean aesthetic.

Key Features

• Long-Range Sensing: High-precision detection up to 56 meters.
• Wide Coverage: Broad ±60° detection angle ensures full room coverage.
• Smart Tuning (Bluetooth & Serial): Easily configure "Gate" sensitivity, distance zones, and delay times via the HLKRadarTool App (iOS/Android) or a serial debugging tool.
• Fine-Grained Zones: Divide the sensing range into intervals and shield interference from objects outside the target area (e.g., a fan or a window).
• Compact Design: Ultra-small footprint (16mm x 22mm) for easy integration.
• Wide Voltage Support: Reliable performance with a 5V to 12V power supply.

Technical Specifications

• Operating Frequency: 24GHz (ISM Band)
• Detection Type: Motion, Micro-motion (Breathing), and Stationary Presence
• Voltage: 5V 12V (Average current ~80mA)
• Output: High/Low GPIO (3.3V Logic) and UART Serial (256,000 baud)
• Mounting: Supports Ceiling or Wall mounting
• Regulations: FCC and CE compliant

Ideal Applications

1. Smart Lighting: Energy-saving control for homes and offices.

2. AIoT Wake-up: Automatically wake up advertising screens or tablets when a person approaches.

3. Safety & Security: Detect intruders or prevent UV lamps from turning on while people are present.

4. Smart Appliances: Power down TVs or Aircons when a room is truly unoccupied.

What's in the box?

1 x LD2410C Human Presence Sensor Module (Bluetooth Enabled)

Resources

• Arduino Library

Pro-Tip for Home Assistant Users: This module is fully compatible with ESPHome. By connecting the TX/RX pins to an ESP32, you can bring real-time distance and occupancy data directly into your dashboard with no complex coding required.