The Ai-Thinker Rd-04 is a compact, cost-effective motion sensing solution based on X-Band Radar Technology. Powered by the Phosense XBR818 chip, this module operates at a center frequency of 10.525GHz.

Precision Without Wall Penetration

Unlike high-power radar modules that can detect movement through thin walls (causing false alarms), the Rd-04 is designed with non-wall-penetrating capability. This makes it the perfect choice for room-specific applications like bathroom lights, bedroom AC control, or office security, ensuring it only reacts to movement inside the target room.

Ultra-Low Power for Battery Devices

Designed for energy efficiency, the Rd-04 consumes power in the microampere range (down to 110μA in pulse mode). This makes it ideal for battery-operated smart locks, video doorbells, and portable security gadgets.

Robust & Reliable

The module integrates a fixed-frequency, directional 1T1R (1 Transmit, 1 Receive) antenna. It is unaffected by environmental factors like temperature, humidity, oil fumes, or water mist, making it superior to standard PIR sensors in harsh environments like kitchens or bathrooms.

Key Features

X-Band Technology: Operates at 10.525GHz for stable motion detection.
Non-Invasive: Does not penetrate walls, reducing false triggers from neighbors or adjacent rooms.
Battery Friendly: Ultra-low power consumption (Microampere level in pulse mode).
Wide Coverage: Detects motion up to 6.5 meters with a wide ±50° angle.
Compact Size: Tiny 15mm x 15mm form factor fits into LED bulbs and slim housings.
Smart Output: Real-time detection results via high/low level output; supports I2C configuration.

Technical Specifications

Feature	Specification
Model	Rd-04
Chipset	Phosense XBR818
Frequency	10.525 GHz (X-Band)
Max Range	6.5 Meters
Detection Angle	±50 Degrees
Power Supply	3.0V ~ 3.6V (Typ 3.3V)
Interface	I2C (IIC) & GPIO Output
Dimensions	15.0mm x 15.0mm
Operating Temp	-40℃ ~ 85℃

Pin Configuration

Pin	Name	Function
1	SDA	I2C Data Line
2	SCL	I2C Clock Line
3	OUT	Detection Result (High = Motion, Low = No Motion)
4	GND	Ground
5	VIN	3.3V Power Input
6	IIC_EN	I2C Enable (Connect to MCU IO for low power control)

Typical Application Scenarios

Smart Lighting: Motion-sensing bulbs, downlights, and ceiling lamps that ignore movement in the next room.
Battery Devices: Video doorbells, smart locks, and pet feeders.
Kitchen & Bath: Unaffected by steam or cooking fumes (unlike PIR sensors).
Security: Hidden sensors for intruder detection.

4. Package Includes

1 x Ai-Thinker Rd-04 10G Radar Module Human Micromotion, Motion Sensing Low Power Module

Documentation & Resources

Important Product Disclaimer

Please note that the product information provided on our website may not be entirely accurate as it is collected from various sources on the web. While we strive to provide the most up-to-date information possible, we cannot guarantee its accuracy. We recommend that you always read the product labels, warnings, and directions before using any product. Product images are shown for illustrative purposes only and may differ from the actual product.

Note

Images are for representation only. The actual product may slightly vary in appearance.

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Downloads and Documentation

Use these manufacturer or reference documents to verify the exact specifications, pin details, firmware support and integration requirements before designing your system.

Documents may be updated by the manufacturer. Always confirm critical electrical and mechanical details with the latest official documentation before production use.

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Frequently Asked Questions

1. What is the Ai-Thinker Rd-04?

The Rd-04 is a compact 10.525GHz X-Band radar motion sensor designed for detecting human movement and micromotion.

2. What is the operating frequency?

It operates at 10.525GHz in the X-band.

3. What is the maximum detection range?

The specified maximum detection range is approximately 6.5 meters.

4. What is the detection angle?

The sensor provides a detection angle of approximately ±50°.

5. What voltage does the module require?

It operates from 3.0V–3.6V DC, with 3.3V as the typical supply voltage.

6. Does it penetrate walls?

The supplied product information describes the Rd-04 as non-wall-penetrating, helping reduce unwanted detection from adjacent rooms.

7. How does it communicate with a microcontroller?

It provides I2C (IIC) communication and a digital GPIO output.

8. What does the OUT pin do?

The OUT pin provides the motion detection result: HIGH = motion detected, LOW = no motion.

9. Is it suitable for battery-powered projects?

Yes. Its low-power operation makes it suitable for smart locks, video doorbells, and other battery-powered devices.

10. Can it be used in kitchens and bathrooms?

Yes. The supplied information states that it is less affected by temperature, humidity, oil fumes, and water mist compared with typical PIR sensors.

11. What is the module size?

The module measures approximately 15mm × 15mm.

12. What are common applications?

It can be used for smart lighting, security systems, smart locks, video doorbells, pet feeders, and room-specific motion detection.

Downloads and Documentation

Use these manufacturer or reference documents to verify the exact specifications, pin details, firmware support and integration requirements before designing your system.

Documents may be updated by the manufacturer. Always confirm critical electrical and mechanical details with the latest official documentation before production use.

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