Home‑Built EMI Mapper! Visualize EMI Hotspots!

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. —