Audio, in reality, is a continuously varying pressure wave in air. What you did in this project is build a thin “measurement and summarization layer” on top of how that pressure wave gets turned into numbers. A few concrete, digestible takeaways from that perspective:

First: the microphone is a pressure-to-voltage sensor, and the ADC is a... See more

Sound can communicate the quality of an action just as powerfully as any visuals.

make all this sound, the LRAD uses lots of little ones. A speaker usually uses one rapidly moving diaphragm to make sound. The LRAD uses an array of piezoelectric transducers. A transducer is simply a device that changes one kind of energy into another kind of energy. In this case, it changes electrical impulses into sound.