# Home‑Built EMI Mapper! Visualize EMI Hotspots!

## Метаданные

- **Канал:** element14 presents
- **YouTube:** https://www.youtube.com/watch?v=HaZoxM82cWM
- **Дата:** 18.05.2026
- **Длительность:** 1:32
- **Просмотры:** 4,380

## Описание

In this element14 presents episode, Clem builds an automated CNC style EMI heatmapping scanner to remove guesswork from near field probing during pre compliance testing. Using an Arduino Uno with GRBL, professional near field probes, and a low cost RTL SDR, the system scans a PCB in a controlled grid and turns raw measurements into clear EMI heatmaps. Along the way, Clem highlights real engineering challenges, including firmware choices, SDR software limitations, and the critical importance of lowering the noise floor through proper shielding, showing how automation and good measurement practice work together, and you can find the supporting files on the element14 Community: https://bit.ly/4d5TYty

#emidebugging #emctesting #hardwareengineering 

[04:01]-Buy it or build it?
[05:09]-The Theory
[09:59]-The Code
[16:47]-Cut the Noise
[24:53]-Making some measurements

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Engage with the element14 presents team on the element14 Community - suggest builds, find project files and behind the scenes video: https://bit.ly/3tmdewv

Visit the element14 Community for more great activities and free hardware:

Tech spotlights: https://bit.ly/3qPrDhM
RoadTest and Reviews: https://bit.ly/3pV5Bux
Project14: https://bit.ly/31wbnJY

## Содержание

### [0:00](https://www.youtube.com/watch?v=HaZoxM82cWM) Segment 1 (00:00 - 01:00)

This is a picture of an Arduino, but not like with a camera not in visible light. This is what it radiates. This is the microcontroller board I designed in my latest KiCad tutorial. I just can't make a few of these and put it on the market. That would be illegal. I have to make sure that this device is safe. The most important ones that everyone will talk about is electromagnetic compatibility EMC. There are laboratory tests. These are expensive and before I want to go to the actual lab for the testing I would rather know if this device will pass or not. So, how would I know where that — frequency originates? What to fix? What is wrong with my product? Here's a laptop on top that will run the actual analysis software. Here's a safety switch, an old 3D printer. We have our sensing probe over here. This will basically only move in X and Y directions. In the belly of the machine basically, there's the RTL-SDR which is connected to the probe. The G-code file then has to be sent to the device, of course. So, I use a resistor to load them and also I just connect the device to charge. So, this device now helps us to decide on hardware changes before we would waste a lot of money on retesting and retesting. We can do the changes, verify that they actually did something in the desired frequency, and only after we have confirmed that, then we get to the expensive test lab. —

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*Источник: https://ekstraktznaniy.ru/video/51802*