Following a neat tutorial from [Dave Jones], [Andrew] came up with a very simple way to make a Bode plot in real-time with an oscilloscope, a microcontroller, and a few off-the-shelf parts.

Figure 2 reflects the Bode plot for this circuit response: Figure 2: Bode plot for a single pole, low-pass filter (Click on image to enlarge) While attempting to accurately determine the corner ...