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I tried this gadget that lets any Bluetooth headphones work on planes — and now I'll never fly without it again
Somewhere over the middle of the country, a very kind United Airlines flight attendant offered me a pair of plastic-wrapped ...
Hackaday10y
Using A Headphone Jack As A UART
On the project Github, [Gordon] used the microphone pin on a TRRS jack to sent data to a computer ... the color of some RGB LEDs in response to input on a webpage.