Speakers can act as part of a useful microphone circuit but you're missing all the amplifiers and ADCs and other stuff to use it as one in any sane speaker driver circuit. They'd have to intentionally add all that, which maybe they would, but it'd be easier to just stick a tiny $0.05 all in one microphone chip on there.
alt Hacker News
Speakers can act as part of a useful microphone circuit but you're missing all the amplifiers and ADCs and other stuff to use it as one in any sane speaker driver circuit. They'd have to intentionally add all that, which maybe they would, but it'd be easier to just stick a tiny $0.05 all in one microphone chip on there.