HB100 Micro-Wave sensor (can be used as Doppler motion-sensor)

The HB100 Microwave Sensor is a Continuous Wave (CW) Doppler transducer operating at 10.525 GHz. It emits microwave signals and detects frequency shifts caused by moving objects within its field of view, making it an effective passive motion detector.

This user-friendly module allows you to monitor local environments or build security systems. The Doppler detection principle works through non-metallic materials such as walls, wood, or plastic, enabling concealed installation. It interfaces easily with Arduino, Raspberry Pi, or any suitable amplifier circuit to process the low-frequency output signal.

Specifications

• Manufacturer: SENMIC
• Type: Microwave Doppler Sensor (CW)
• Emission Frequency: 10.525 GHz ± 20 MHz
• Supply Voltage: 3.3 V to 5 V DC
• Current Consumption: Typically 35 mA at 5 V
• Detection Range: Up to 20-30 meters depending on environment
• Detection Angle: Wide cone (approx. 60° to 90°)
• Interface: 4 pins (VCC, GND, OUT, and often NC or secondary signal)
• Output Type: Analog sinusoidal signal proportional to radial velocity

For further reading, check this detailed technical article on building a Doppler motion sensor using this module: limpkin.fr.