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The microphone isn't powered, so there's no way to do something as direct as you're asking for. A light indicating that it's "listening" would necessarily have
by jaywalk 7y ago
The microphone isn't powered, so there's no way to do something as direct as you're asking for. A light indicating that it's "listening" would necessarily have to be controlled by software at some level.
- sjwright 7y agoIt turns out the microphone modules used in smartphones have integrated preamp and ADC circuitry which needs to be powered. This makes a lot of sense as mobile phones are an extremely hostile RF environment. If it were any other way, the phone's sound inputs would be flooded with that iconic "cell phone interference" sound. Old but still interesting: https://www.ifixit.com/Teardown/iPhone+4+Microphone+Teardown/3473 https://www.ifixit.com/Teardown/iPhone+4+Microphone+Teardown...
- metaphor 7y agoFact: All software is constrained by hardware. Period. What you describe as "no way" is a 2-second napkin sketch for any witting electronics hobbyist, let alone a proper design EE professional.
- rudolph9 7y agoExactly! Set up those constraints such that a light hard wired into the power for a sensor such that if the sensor has power, the light has power too.