Over time, the jack and plug have spawned different versions with ... jack with four conductors for a headset — usually known as TRRS for tip-ring-ring-sleeve. Many still do, at least for ...
On the project Github, [Gordon] used the microphone pin on a TRRS jack to sent data to a computer. It needs two more resistors, but other than that, it’s as simple as the one-way communications ...
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