Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Frequency	24 GHz ISM Band
Detection Range	0.5m to 8m (Adjustable)
Communication Interface	UART / Bluetooth 5.0 BLE
Supply Voltage	3.3V DC ±5%
Current Consumption	< 15mA (Active Mode)
Beam Angle	±45° Horizontal, ±30° Vertical
Microcontroller	Integrated High-Performance MCU
Operating Temperature	-40°C to +85°C
Dimensions	26mm x 20mm x 2.5mm
Application Scenario	Smart Lighting, HVAC Control, Security Systems

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Reliable presence detection

Unlike standard PIR sensors, this millimeter-wave radar detects stationary humans effectively. I used it to control my office AC, and it no longer turns off while I'm sitting still at my desk. Highly recommended.

Anonymous

Mar 24, 2026

Rating: 5/5

Best in class for 24GHz

I have tested several modules in this category, and the LD2401 offers the best balance of performance and ease of use. The multi-target detection capability is impressive for such a compact module.

Anonymous

Mar 20, 2026

Rating: 5/5

Easy integration with ESP32

Connected this directly to an ESP32 using the TX/RX pins. The protocol is straightforward, and the data output is consistent. The ability to update firmware over Bluetooth is a nice bonus feature.

Anonymous

Mar 15, 2026

Rating: 4/5

Compact and powerful

Very small footprint which fits perfectly inside my custom switch boxes. Detection range is accurate as advertised. Only giving 4 stars because the antenna orientation matters quite a bit for optimal performance.

Anonymous

Mar 11, 2026

Rating: 4/5

Great value but needs careful calibration

The hardware quality is solid for the price. Initially, it had some false positives near a vibrating fan, but after tweaking the sensitivity parameters via UART, it works flawlessly. Documentation could be slightly more detailed.

Anonymous

Mar 02, 2026

Rating: 5/5

Perfect for Smart Home Automation

This sensor is incredibly sensitive and accurately detects even subtle movements like breathing. The Bluetooth configuration app made setting up detection zones a breeze. Integrated it into my living room lighting system successfully.

5 FAQ

Q: Does this module come with a casing or is it just the bare PCB?

A: This product is sold as a bare PCB module intended for integration into other devices or enclosures. It does not include a plastic housing, but the pin headers are pre-soldered for easy prototyping.

Q: Is there a Python library available for parsing the UART data?

A: Yes, the community has developed several open-source Python libraries for parsing LD2401 data streams. You can find them on GitHub by searching for 'LD2401 Python'. We also provide a basic protocol document in the download section.

Q: Can this sensor detect people through a thin wooden door?

A: While millimeter-wave radar can penetrate non-metallic materials to some extent, performance depends on material thickness and density. For reliable operation, we recommend line-of-sight installation or mounting where the signal does not need to pass through solid obstacles.

Q: What is the maximum number of targets this module can track simultaneously?

A: The LD2401 can typically distinguish and track up to 3 separate moving targets within its field of view, depending on their separation distance and the configured sensitivity settings.

Q: Can I power this directly from a 5V Arduino pin?

A: No, the module operates at 3.3V. Connecting it directly to a 5V source may damage the sensor. Please use a 3.3V regulator or a logic level converter if your microcontroller operates at 5V.

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