RCWL-0516 is a technology that uses radar Doppler, microwave induction special module for detecting moving objects. The RCWL-0516 microwave radar sensor module can detect inert objects at the condition that it has enough density, volume and it is in motion. THis microwave radar sensor will sense motion through most anything. The more shielding there is, the less detection range you get. It can detect motion through glass, drywall walls, ceilings and floors. It is very sensitive. You might have to filter the power supply.

• Output Power: 3.3V
• Wide Fan Operating Voltage: 4-28V

• Schematic