Digital Microwave Motion Sensor Expand

Digital Microwave Motion Sensor

DFRobot DFRobot



This Digital Microwave Motion Sensor from DFRobot is capable of accurately detecting motion, measuring speeds and even identifying volumetric capacity!

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R 279.95

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While most people would imagine common kitchen appliances whenever microwaves are mentioned, the truth is that microwaves are just like any other waves, and can be used for a very broad range of applications aside from just exciting water molecules and heating them up. One such example of how microwaves can be used in very clever ways is this Digital Microwave Motion Sensor from DFRobot, which utilises the Doppler Effect to identify moving objects, as well as surprisingly accurate speeds of those moving objects.

The Doppler Effect is the same effect that makes the noise of cars sound different as they are getting closer or moving away, and is caused by the compounding and receding sound waves (or light, water or any other waves) as they stack together in front of the moving object while spreading apart behind the object. This microwave sensor detects whether the waves are stacking or spreading, and in turn can work out whether the object is moving closer or further, as well as what speed that object is travelling. This is the same way we measure the speeds of other celestial objects in the universe, although in that sense we use light waves rather than microwaves, which redshift as objects move away, and blueshift as objects come closer.

In addition to measuring motion and speeds, microwave sensors like these are also used to measure volume, and once calibrated can even penetrate dust, smog, water vapour and other visually impairing effects. This offers impressive accuracy compared to sonic or light sensors, which are often inhibited by dust and other particles in the air, with microwaves being capable of cutting through these particles to find the actual solid particles that form the surface of the product being measured.


Digital Microwave Motion Sensor  -  Technical Specifications:

  • Rated Voltage                                      

– 5V ±0.25V DC

  • Rated Current

– 37mA (Typical)  /  60mA (Max)

  • Physical Connection Interface

– 3 Pin Gravity Interface

  • Dimensions

– 48.5 x 63mm

  • Detection Distance

– 2 to 16 meters (Continuously Adjustable)


Digital Microwave Motion Sensor  -  Emission Parameters:

  • Emission Frequency

– 10.525GHz                                                            

  • Precision Frequency Setting

– 3MHz

  • Output Power (Minimum)

– 13dBm EIRP

  • Harmonic Emission

– Less than -10dBm

  • Average Current Consumption (5%DC)

– 2mA (Typical)

  • Pulse Width (Minimum)

– 5μSec

  • Load Cycle (Minimum)

– 1%


Digital Microwave Motion Sensor  -  Reception Parameters:

  • Sensitivity (10dB S/N Ratio)

– 3 to 80Hz                                                    

  • Bandwidth

– -86dBm

  • 3Hz to 80Hz Bandwidth Clutter

– 10μV

  • Antenna Gain

– 8dBi

  • Vertical 3dB Beam Width

– 36 Degrees

  • Horizontal 3dB Beam Width

– 72 Degrees


Typical Applications for Digital Microwave Motion Sensor:

Microwave sensors are often used in professional and industrial applications like vehicle speed monitoring devices and volumetric measurement in structures like silos or even furnaces, and only recently have they become accessible and affordable enough to be used in hobbyist applications. As such, when we found these advanced little Sensor Modules from DFRobot, we just knew that these were some modules we seriously wanted to experiment with.

Some of the hobbyist applications that microwave sensors can be used for include building simple speed monitoring devices, motion tracking systems that sound alarms or activate relays and other actuators when motion is captured. However, more advanced projects include creating your own cruise control for Robotics, integrating speed and motion sensing into drones or other projects, as well as crafting your own volumetric measuring system that only needs to be calibrated once to produce consistent, precisely accurate measurements each and every time.


Additional Resources:

DFRobot Official Product Wiki Page


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Digital Microwave Motion Sensor

Digital Microwave Motion Sensor

As self-proclaimed “Robo-holics”, DFRobot is a company comprised of over 100 staff members, of which 30% are engineers who love to build robots. It was started in 2008 with the goal of embracing and promoting open-source hardware, with a core focus on Arduino, Raspberry Pi and their very own LattePanda development boards. Since then, DFRobot have manufactured over 1300 unique modules, sensors and components that all work together and complement each other, allowing users like us to enjoy a full spectrum of cutting edge robotics and electronics without having to pay premium prices.

With the primary goal of developing and manufacturing great quality products, while making them accessible to as many people as possible, DFRobot are rapidly becoming one of the most common-place brands in the world of open-source robotics and electronics. With more than 1300 products developed in-house, and an impressive range of different categories and specialisations, there are few brands in the world who can compete in terms of quality, accessibility and genuine innovation.