HaiWang HW-MD08 Microwave Radar Motion Sensor Module - 0.5-8m Range, 10.525GHz

The HW-MD08 is a continuous-wave (CW) Doppler radar sensor. It transmits a constant 10.525GHz microwave signal and analyzes the frequency shift of the reflected signal caused by a moving object. This Doppler shift is processed to detect motion and trigger its digital output.

The module features an onboard potentiometer for adjusting the detection range and sensitivity. Turning the potentiometer clockwise typically increases the range and sensitivity, allowing you to fine-tune the sensing distance from the minimum of 0.5 meters up to the maximum of 8 meters to suit your specific application.

The module provides a digital active-high output signal. When motion is detected, the output pin goes high (logic 1, at the supply voltage level). To interface with an Arduino, connect the module's VCC to 5V, GND to GND, and the OUT pin to any digital input pin. You can then read the pin state using `digitalRead()` to trigger your code.

Yes, microwave signals at 10.525GHz can penetrate most non-metallic materials like drywall, wood, plastic, and glass with minimal attenuation. This allows the HW-MD08 to detect motion through such barriers, making it suitable for concealed installation. However, metal surfaces or foil-backed insulation will block the signal.

The module consumes less than 45mA during operation. It is designed for a 3.3V to 5V DC power supply. A stable, regulated power source is recommended to ensure consistent performance and avoid false triggers caused by voltage fluctuations. For battery-powered projects, consider its continuous current draw in your power budget.