RCWL-0516 Microwave Radar Sensor – 5V Motion Detection Through Walls

The RCWL-0516 is a Doppler radar motion sensor module that uses microwave signals to detect movement through non-metallic barriers like drywall, wood, and glass. Unlike passive infrared (PIR) sensors, it does not require line-of-sight and can sense motion even behind walls or doors. Ideal for hidden sensor installations, automatic lighting, and security systems.

Key Specifications

What You Can Build With This

• Motion-activated room lighting that works even with hidden sensor placement
• DIY security alarm with SMS alerts using GSM module and Arduino
• Automatic door or gate opener triggered by approaching people or vehicles
• Smart home occupancy sensor for presence-based automation with NodeMCU

Compatibility

Works with any 3.3 V or 5 V microcontroller including Arduino Uno/Nano, ESP8266, ESP32, and Raspberry Pi. The 3.3 V logic output is safe for Raspberry Pi GPIO directly, and is reliably read as HIGH by 5 V Arduino inputs. No external level shifting required for most setups.

Wiring Notes

Connect VCC to 3.3–5 V (use 5 V for best detection range), GND to common ground, and OUT to a digital input pin. Keep the antenna area away from large metal objects and WiFi routers to avoid interference. For noisy power supplies, add a 100 μF electrolytic capacitor across VCC and GND.

Why Buy from Compoden

Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.