We’re pretty sure he is not using an actual oscilloscope to generate the visuals, but rather visualization software that can approximate the output of an O-scope set in X-Y display mode.

However, [lonesoulsurfer] went a different route with this fun DIY build, creating an oscilloscope with a low-resolution LED display. Yes, the signals are shown on a 10×10 matrix made up of red LEDs.

An oscilloscope makes the invisible world of electricity visible, letting you observe electrical signals on a video display in real-time. For $25, the Flea-Scope plugs into any computer via USB ...