Arduino Radar: How to fade an LED with your breath

By on October 13, 2015

Web site:

Project Summary:

In this project, I will show you how to use an Arduino to work with the radar module from XeThru. The radar will sense my breath without any contact, by using electromagnetic pulses to measure the movements of my belly. Then I map these movements into control the intensity of the LED.

Full Project:

I got my hands on this new cool radar module from XeThru (

XeThru radar module

XeThru radar module

Using off-the-shelf components, I hooked it up to my Arduino Uno on a breadboard.

It uses electromagnetic pulses to measure the movements of my tummy when I breath. I use this measurement to fade the LED in and out.

The cool thing is that it can see through things. So you could also build it into a chair to see that your grandma is still breathing, or into a mattress to measure the quality of your sleep.

I posted all the details, hardware, code and everything on my blog with a hope to see more people playing around with this technology:

I think we’re going to see some pretty cool projects when this technology gets more widespread.

Circuit diagram:

Arduino radar circuit diagram

How to hook up the radar to the arduino

Bill of Materials:

  • Arduino UNO
  • XeThru radar module (
  • 2.8V voltage source
  • BSS138 level shifter
  • RGB Led
  • 3 x 100 Ohm resistor



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