RCWL-0516 Microwave Radar Sensor Module

RCWL-0516 Microwave Radar Sensor Module is a compact, low-cost device that utilizes Doppler radar technology to detect motion. This module operates at 3.2 GHz, offering superior sensitivity and a wider detection range compared to traditional passive infrared (PIR) sensors. Consequently, it can detect movement through non-metallic barriers, including wood, plastic, and thin walls. Furthermore, its small size and high stability make it an ideal choice for embedded systems and battery-powered applications. Therefore, system designers frequently select the RCWL-0516 for smart lighting and security systems where consistent, wide-area detection is mandatory.

Key Features:

• Doppler Radar Technology: Employs continuous wave (CW) radar at ≈ 3.2 GHz for highly sensitive, omnidirectional motion detection across a wide field of view.
• Through-Wall Detection: This capability allows the sensor to detect movement through non-metallic obstructions like plastic enclosures or drywall, improving design flexibility.
• Wide Operating Voltage: The module operates across a broad voltage range (DC 4 V – 28 V), making it simple to interface with 5V or 3.3V microcontrollers.
• Low Power Consumption: It operates with minimal current draw (≈ 2.8 mA), hence it is perfect for battery-powered security and monitoring applications.
• Adjustable Parameters: Users can easily modify the detection distance, hold time, and sensitivity by soldering external resistors or capacitors to dedicated component pads (e.g., C-TM, R-GN, R-CDS).

Technical Specifications:

• Operating Voltage (V_IN): DC 4 V to 28 V
• Operating Current (I_OP): ≈ 2.8 mA
• Detection Frequency: ≈ 3.2 GHz (K-band range)
• Detection Distance: 5 to 7 meters (Adjustable)
• Transmission Power (EIRP): < 20 mW (Low power, safe operation)
• Output Signal: HIGH (3.3V) / LOW (0V)
• Output Current: 100 mA (Max for 3V3 pin output)
• Default Hold Time (T_H): ≈ 2 seconds

Mechanical Specifications:

• Module Material: FR-4 PCB with SMT components and integrated antenna.
• Antenna Type: On-board Microstrip Patch Antenna
• Mounting: Solder pads for through-hole pin headers or direct soldering to the host board.
• Reliability: Highly resilient to temperature and humidity variations compared to traditional PIR sensors.

Dimensions:

• Length: ≈ 35.8 mm
• Width: ≈ 17.3 mm
• Height (Max): ≈ 3.2 mm (Ultra-thin profile)
• Pin Pitch: 2.54 mm (0.1 inch standard)
• Weight: < 1 g (Extremely lightweight)

Pinout and Wiring:

• 3V3 (Power Output): Provides a regulated 3.3V DC supply at up to 100 mA for external microcontrollers or sensors.
• GND (Ground): Connect the circuit common ground to this pin.
• OUT (Digital Output): This pin goes HIGH (3.3V) when the module detects motion and returns to LOW (0V) after the hold time expires.
• VIN (Power Input): Apply the module’s main operating voltage (DC 4V – 28V) here.
• CDS (LDR Input): Connect an external photoresistor (LDR) between the CDS pad and GND to enable light-dependent operation.

Datasheet Reference:

• Download RCWL-0516 Microwave Sensor Datasheet

Commonly Used in:

• DIY Electronics Projects: Provides a low-cost, effective motion sensing solution for hobbyists and students.
• Smart Lighting Systems: Integrates seamlessly into automatic light switches and energy-saving ceiling lights.
• Wireless Security Devices: Serves as the primary motion detector in battery-powered, non-intrusive alarm systems.
• Custom Enclosures: Designers use this module within plastic or wooden casings where PIR sensors cannot function reliably.

Applications:

• Occupancy Sensing: Accurately detects human presence in rooms, offices, and hallways.
• Contactless Switching: Activates devices (e.g., automated hand dryers or water dispensers) without physical touch.
• Security Alarms: Provides reliable movement alerts, even when hidden behind furniture or thin walls.
• Automated Doors: Triggers opening mechanisms in commercial and residential settings.

Equivalent Models:

• HB100 Microwave Module: A classic Doppler radar module, however, it typically requires more external components for signal processing than the RCWL-0516.
• HC-SR501 PIR Sensor: While not a radar equivalent, this is the most common passive infrared sensor that performs a similar motion detection function but requires line-of-sight.
• X-Band Radar Modules: Larger, higher-power radar sensors used in industrial applications, which the RCWL-0516 offers a miniature alternative to.

Package Includes:

• 1 x RCWL-0516 Microwave Radar Sensor Module