HaiWang HW-MS03 Microwave Radar Motion Sensor Module, 10m Range

The provided specifications do not list a specific voltage, but typical microwave sensor modules of this type operate on a DC supply between 3.3V and 5V. It is crucial to verify the exact input voltage range from the manufacturer's datasheet before connecting power to prevent damage. The low static current of <3mA makes it compatible with most microcontroller power supplies.

The HW-MS03 features onboard potentiometers for adjustment. One potentiometer controls the sensitivity, which directly affects the maximum detection range (up to 10m). Another sets the duration the output signal remains active after motion is detected, with a default of 2 seconds. Use a small screwdriver to turn these potentiometers while testing the module's response in your intended setup.

Yes, microwave Doppler sensors like the HW-MS03 can detect motion through non-metallic materials such as drywall, plastic, glass, and thin wood. This capability makes them suitable for concealed installations. However, metal barriers or very thick, dense materials will block the signals. The penetration ability is a key advantage over PIR sensors, which require a direct line of sight.

In repeatable (retrigger) mode, the output delay timer resets each time new motion is detected, extending the active signal. In non-repeatable mode, the output activates for the set delay period after the first trigger and ignores subsequent motion until the timer completes and resets. Choose repeatable mode for areas with continuous activity and non-repeatable for brief activation bursts.