Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Frequency	24 GHz
Detection Range	0.1m - 8m
Interface Type	UART / TTL
Supply Voltage	3.3V - 5V DC
Chip Model	S3KM1110
Beam Angle	Horizontal 70°, Vertical 60°
Output Format	Distance, Speed, Angle Data
PCB Dimensions	24mm x 24mm
Operating Temperature	-20°C to +70°C
Application Scenario	Presence Detection, Gesture Control

6 reviews

Anonymous

Mar 29, 2026

Rating: 4/5

Great value but needs calibration

Works well out of the box, but you need to spend time calibrating the thresholds in the software to avoid false positives from ceiling fans. Once tuned, it's very accurate.

Anonymous

Mar 17, 2026

Rating: 5/5

Excellent sensitivity for micro-motion

This module is incredibly sensitive. I used it for a smart lighting project and it detects even slight hand movements reliably. The UART output is easy to parse with an ESP32.

Anonymous

Mar 07, 2026

Rating: 5/5

Compact and powerful

The form factor is tiny, making it easy to hide inside enclosures. The 24GHz frequency provides a good balance between resolution and penetration through plastic cases.

Anonymous

Mar 05, 2026

Rating: 4/5

Solid documentation

Waveshare provided good example code and a clear pinout diagram. Integration took less than an hour. Only wish the range was slightly longer for large rooms.

Anonymous

Mar 03, 2026

Rating: 5/5

Perfect for presence detection

Unlike standard PIR sensors, this FMCW radar can detect stationary humans. It solved my issue of lights turning off while I was sitting still at my desk.

Anonymous

Mar 02, 2026

Rating: 3/5

Good hardware, steep learning curve

The hardware quality is top-notch, but understanding the raw data stream requires some signal processing knowledge. Not ideal for absolute beginners without coding experience.

5 FAQ

Q: Does it work through a thin plastic enclosure?

A: Absolutely. The 24GHz mmWave signals can penetrate non-metallic materials like ABS plastic, wood, or glass, allowing you to conceal the module behind a cover.

Q: What is the maximum update rate for the data output?

A: The default configuration typically outputs data at around 10Hz to 20Hz, but this can be adjusted via the configuration commands depending on your specific application needs.

Q: Can multiple modules be used in the same room without interference?

A: It is possible, but you should configure them to operate on different frequency channels or time-division multiplex their operation to minimize cross-talk interference.

Q: Is there a library available for Arduino?

A: Yes, Waveshare provides a sample Arduino library on their Wiki page that handles the serial communication and parses the distance and speed data automatically.

Q: Can this sensor detect breathing patterns?

A: Yes, due to its high sensitivity to micro-motions, it can detect chest expansions associated with breathing when the subject is within close range (approx. 1-2 meters) and stationary.

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