Microwave Radar Sensor Module (RCWL-0516)

Microwave Radar Sensor Module (RCWL-0516) Overview

The RCWL-0516 microwave radar sensor module uses 3.2 GHz radar pulses to detect even small movements through walls and glass. Designed for security and automation applications, this compact microwave radar sensor module delivers fast, reliable sensing in complete darkness and challenging environments.

Key Features of the RCWL-0516 Microwave Radar Sensor

• Frequency: 3.2 GHz radar pulses for through-wall detection
• Compact size: 15 x 30 mm PCB fits into tight enclosures and corners
• Response time: triggers in under 50 ms for instant action
• Weatherproof housing: sealed shell resists dust and light rain
• Power: Compatible with 3.3–5 V microcontrollers, low power operation
• Simple interface: 3 pins – VCC, GND, OUT
• Better than PIR: penetrates obstacles, tracks speed and direction

Technical Specifications

• Model: RCWL-0516
• Sensing method: Microwave Doppler radar
• Operating frequency: 3.2 GHz
• Typical trigger time: < 50 ms
• Supply voltage: 3.3 V to 5 V
• Output: Digital OUT pin (high/low signal)
• PCB dimensions: 15 x 30 mm
• Environmental protection: sealed shell, dust and light rain resistant

Applications – Where to Use the Microwave Sensor Module

• Home and office security systems
• Automatic lighting and hallway activation
• Smart doorbells and approach detection
• Robotics and presence detection
• Industrial automation and people-counting systems

Integration and Wiring Guide

The RCWL-0516 microwave sensor module is designed for quick integration with any microcontroller that accepts 3.3–5 V logic. Wire the module using three pins:

• VCC – connect to 3.3 V or 5 V power supply
• GND – connect to system ground
• OUT – digital output signal to microcontroller input or relay driver

For rapid prototyping use the available Arduino libraries and example sketches to read the OUT pin, debounce the signal if needed and trigger relays, lights or notifications.

Quick Start Tips

• Place the module away from large metal surfaces for best sensitivity
• Use pull-down or pull-up resistor on the OUT pin if your microcontroller input is floating
• Adjust sensor placement to balance range and false trigger suppression

Comparison with PIR Sensors

As a microwave radar sensor, the RCWL-0516 provides advantages over passive infrared sensors:

• Penetrates thin walls and glass – can detect motion even when the sensor is not in direct line of sight
• Detects motion in total darkness without relying on thermal changes
• Tracks speed and direction of movement for more intelligent triggering
• Less prone to false triggers from changes in ambient temperature or wind-driven objects

Weatherproofing and Durability

The radar sensor module comes housed in a sealed shell that resists dust and light rain. This makes it suitable for sheltered outdoor installations as well as demanding indoor environments. For fully exposed outdoor use, mount the module inside a waterproof enclosure.

Story Behind the Sensor

Engineers developed the RCWL-0516 to overcome false triggers commonly seen with PIR sensors in windy conditions. The radar-based design was refined to combine micron-level motion sensitivity with reliable performance in real-world installations.

Note: Pictures are for illustration purposes only.