Comment on Show HN: Program Microcontrollers from Your Headphone jackparentComments−voltagex_11yI didn't realise how common it was to multi-purpose these jacks until recently.Nexus 4 and 5 have their UART via the headphone jack - you need a TRRS headphone cable with the correct resistor wired up to one of the pins.Kenwood even came up with a standard for it: http://www.miklor.com/COM/UV_Technical.php#progcableA popular series of VHF/UHF
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I didn't realise how common it was to multi-purpose these jacks until recently.
Nexus 4 and 5 have their UART via the headphone jack - you need a TRRS headphone cable with the correct resistor wired up to one of the pins.
Kenwood even came up with a standard for it: http://www.miklor.com/COM/UV_Technical.php#progcable
A popular series of VHF/UHF