The Square credit card reading device is basically just a magnetic read head, resistor, and microphone connection. By implementing an algorithm to decode the standardized audio encoding, it's possible to read arbitrary magnetic cards, not just credit cards. Skip to the end to find a link to my completed app. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson.
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How to Parse Magstripe Credit Card Data - ID TECH
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Magnetic stripe card
A magnetic card can store any form of digital data. The electronic devices designed to read stored information from a magnetic card do so either when someone swipes the card through a slot in the reading device or holds the card next to a magnetic card reader. About a hundred bytes of information can be stored on a magnetic card. These standards also define specifications for a storage format and information exchange. Before describing how a magnetic card reader works, look at how data is stored on a magnetic card and the format of data storage collected.
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