I always assumed, based on my tiny amount of knowledge of the Square credit card... | Hacker News

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		binarymax on Nov 18, 2014 \| parent \| context \| favorite \| on: Show HN: Program Microcontrollers from Your Headph... I always assumed, based on my tiny amount of knowledge of the Square credit card reader, that this was possible on iOS? https://squareup.com/reader

lgeek on Nov 18, 2014 [–]

I think it's using the analog audio hardware, similarly to this project.

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