Excerpts:<p>"The most basic pins are digital pins, they can only either be on or off. You would, for example, use them to check if a button is pressed. Or if you use them as output, turning a led on or off."<p>[intermediate content deleted for brevity...]<p>"And while those pins cannot output a true analog signal, they can use a technique called PWM to approximate one by only switching the signal on for some time."<p>Fascinating! Knew about digital pins before this, and PWM generally speaking (with respect to PC fans, power supplies, etc.) -- and yet, I did not proverbially put "2 + 2 together" in my head! (For some inconceivable reason I always conceptualized PWM as analog/multiple waves per unit time, in nature...) Yup, makes a ton of sense!<p>Anyway, thanks for the great article!