Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Frequency	24 GHz ISM Band
Detection Range	0.5m to 12m (Adjustable)
Interface Protocol	UART / TTL
Supply Voltage	3.3V DC ±5%
Current Consumption	< 40mA (Active Mode)
Antenna Type	Onboard PCB Patch Antenna
Beam Angle	Horizontal 80°, Vertical 60°
Supported Models	RD-01, RD-03, RD-04
Operating Temperature	-20°C to +70°C
Dimensions	25mm x 20mm x 3mm

6 reviews

Anonymous

Mar 24, 2026

Rating: 4/5

Good value for money

Compared to other 24GHz modules on the market, this offers a great balance of price and performance. It struggles slightly with thick drywall, but works perfectly for line-of-sight indoor applications.

Anonymous

Mar 23, 2026

Rating: 5/5

Low power consumption verified

Measured the current draw myself and it matches the specs. Ideal for battery-powered devices if you implement a sleep mode strategy. The micro-motion feature is a game changer for security alarms.

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for smart home automation

I used the RD-03 model for a bedroom lighting project. The micro-motion detection is incredibly sensitive; it can detect breathing even when the person is completely still. Integration with my ESP32 was straightforward via UART.

Anonymous

Mar 16, 2026

Rating: 5/5

Reliable for occupancy counting

We deployed several RD-04 modules in our conference room. They accurately track entry and exit, helping us manage HVAC systems efficiently. The onboard antenna saves significant space on our custom PCBs.

Anonymous

Mar 06, 2026

Rating: 5/5

Excellent documentation support

As someone new to radar sensors, I found the datasheet and example code very helpful. The module detected my hand waving from 8 meters away during testing. Highly recommended for prototyping.

Anonymous

Mar 06, 2026

Rating: 4/5

Great sensitivity, needs tuning

The sensor works well out of the box, but I had to adjust the sensitivity registers to prevent false triggers from ceiling fans. Once tuned, it reliably detects presence without needing large movements.

5 FAQ

Q: Can I daisy-chain multiple sensors on one UART bus?

A: Each sensor has a unique address that can be configured. While they share the physical bus, you must poll them individually or set them to different reporting intervals to avoid data collisions.

Q: Can this sensor detect a person sleeping without any movement?

A: Yes, the RD-03 and RD-04 models are specifically designed for micro-motion detection, capable of sensing chest expansion from breathing even when the subject is stationary.

Q: Is there an SDK available for Arduino integration?

A: Yes, we provide a library compatible with Arduino IDE that simplifies UART communication and parameter configuration for all supported RD series modules.

Q: Does the onboard antenna work through plastic enclosures?

A: Yes, 24GHz radar signals generally pass through non-metallic materials like plastic, wood, and glass with minimal attenuation. Avoid metal housings as they will block the signal.

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

A: The standard output refresh rate is configurable via UART commands, typically ranging from 10Hz to 50Hz depending on your specific application requirements.

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