ingenuity of original square card reader underrated imo.

the reader tunneled the card number through the mic input. It's recovered  in software by analyzing the waveform.

It was brilliant engineering, a major unlock for commerce and packaged beautifully.

hardware breakdown:

ingenuity of original square card reader underrated imo.

the reader tunneled the card number through the mic input. It's recovered  in software by analyzing the waveform.

It was brilliant engineering, a major unlock for commerce and packaged beautifully.

hardware breakdown: https://tinyurl.com/jdm8ct2a

building /automod (channel bots), /glass (no code frames) • uncurated.xyz
• prev @manifoldxyz, twilio

This is one of those products that felt like magic

Plug it in, open the app, swipe a card

Incredible innovation