24GHz Millimeter Wave Radar Module | FMCW Human Motion & Presence Sensor

The 24GHz Millimeter Wave Radar Module is a compact FMCW radar sensor designed for reliable motion and presence detection in electronics, robotics, IoT, automation and smart-device projects. Operating in the 24.00GHz to 24.25GHz frequency range, this module can detect targets at an adjustable distance of approximately 0.75m to 6m with a detection angle of up to ±60°.

Unlike conventional PIR sensors, millimeter-wave radar can detect movement and subtle motion using radio-frequency signals. Similar 24GHz FMCW modules are widely used for human presence detection, motion sensing, occupancy detection, smart lighting, automation and embedded applications.

This radar module uses FMCW, Frequency Modulated Continuous Wave, technology and provides a 3.3V serial-level output, making it suitable for integration with microcontrollers and embedded development boards. The listed module operates from approximately 3.0V to 3.6V, typically using 3.3V, with current consumption around 50mA.

For Bangladeshi students, robotics enthusiasts, engineers and makers, this module is useful for building smart home systems, automatic lighting, human presence detection, security systems, IoT devices, robot sensing projects and academic prototypes.

Features:

• 24GHz millimeter-wave radar sensing
• 24.00GHz–24.25GHz operating frequency
• FMCW radar technology
• Adjustable detection range: approximately 0.75m–6m
• Wide detection angle: ±60°
• 3.3V typical power supply
• Low current consumption of approximately 50mA
• 3.3V serial output level
• Serial ASCII data output
• Compact module suitable for embedded projects
• Suitable for robotics, IoT, automation and smart-home applications
• Operating temperature: approximately -40°C to +85°C

Specifications:

Specifications are based on the listed product data and may vary slightly by production revision.

Applications:

The 24GHz radar sensor can be used in a wide range of electronics and embedded projects, including:

Human Motion Detection: Detect movement without relying on conventional infrared sensing.

Presence Detection: Build smart occupancy and room-presence systems.

Smart Lighting: Automatically control lights based on detected human activity.

Security Systems: Use radar sensing as part of an intelligent intrusion or movement detection system.

Robotics: Add non-contact motion sensing to robots and autonomous prototypes.

IoT Projects: Integrate radar detection with ESP32, Arduino, STM32 and other microcontroller-based systems.

Home Automation: Create automatic switches, occupancy-aware devices and energy-saving systems.

Academic Projects: Useful for university, polytechnic and engineering laboratory experiments involving radar, sensors, embedded systems and signal processing.

24GHz FMCW radar modules are also used in commercial presence and motion-sensing solutions because they can detect motion and, depending on the specific radar design, subtle or stationary human presence.

Why Use a 24GHz Radar Sensor?

Millimeter-wave radar provides a different sensing method from PIR and ultrasonic sensors. Radar works by transmitting radio-frequency energy and analyzing reflected signals from objects. FMCW radar can provide useful information about target movement and distance depending on the module's hardware and signal-processing implementation.

For electronics developers, this makes a 24GHz radar module an interesting choice for projects where conventional motion sensors may not provide the desired sensing capability.

Compatible Development Platforms

This module can be considered for projects using:

Arduino | ESP32 | ESP8266 | STM32 | Raspberry Pi | Embedded Linux systems | Custom microcontroller boards

Before connecting the module to a development board, verify the module's actual UART voltage level and power requirements. The listed module specifies a 3.3V output level and approximately 3.3V operating supply.

Important Installation Notes

For reliable operation, avoid placing the radar where strong reflective objects or continuously moving objects are directly within the sensing area. Metal or other materials that significantly shield electromagnetic waves should not be placed in front of the radar antenna. Fans, curtains, moving plants and strong reflective surfaces can potentially affect sensing performance.

If an enclosure is used, choose a material that allows 24GHz radio waves to pass through effectively and avoid metallic shielding around the antenna area.