Remember, all signals are analog, even those that pose as digital. Ever hear of signal integrity? Now probably not given the pedesctrian speeds you work at. You should come to DesignCon, a digital deisgn conference that's really all analog.
I suggest downloading a tone generator app, which hopefully will give you something close to a sine wave (another analog thing). I suggest checking the output on an oscilloscope set to give you at FFT (fast Fourier Transform for you digital folk). You should see the fundamental tone but you may see harmonics. Hmm maybe I can write an article comparing tone generator apps.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.