RCWL-0516 Microwave Radar Motion Detection Module

The RCWL-0516 module utilizes Doppler radar technology to detect object movement within its range, with a detection distance varying between 5 and 9 meters. This makes it an ideal choice for security systems, automation, and smart home projects.

Main Features:

• Technology: Microwave sensor based on Doppler effect
• Detection Distance: 5 – 9 m (7 m typically)
• Power Supply Voltage: 4 – 28 V DC
• Current Consumption: 2.8 mA (typical)
• Output Voltage (OUT): 3.3 V (max 100 mA)
• Radio Transmission Power: 20 mW typical, 30 mW maximum
• Operating Temperature: -20°C ~ +80°C
• Storage Temperature: -40°C ~ +100°C

Operation:

The module continuously emits radio pulses and measures the response time. If a nearby object moves, the response time changes, triggering the OUT pin. This pin will generate a voltage equal to VIN upon detection.

Available Pins:

• VIN: Power supply input (4 – 28 V DC)
• GND: Ground
• OUT: Active output signal upon motion detection
• 3.3 V: Constant voltage output (max 100 mA)
• CDS: Disables the sensor if voltage < 0.7 V

Customizable Changes:

• CTM: Adjusts the reactivation time (default 2 seconds). Increasing the capacitor value extends this time.
• R-GN: Adjusts the detection distance (1MΩ → ~5 m)
• CDS (Photoresistor): Allows sensor deactivation during the day. It can be installed on the board or externally via the header.
• R-CDS: Internal pull-down resistor to disable the CDS light sensor.

The RCWL-0516 module serves as an effective alternative to traditional PIR sensors, offering a longer range and detection through thin obstacles.