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I recommend open-source campus cards and black/white cards.

Overview

If you have a coupon, it's free.
You can simply remove the campus card chip and solder it on, or you can buy a blank card, write the chip into it, and then remove the chip and solder it on. The LEDs and resistors used are 8085 standard, and the resistors are 100 ohms; these are easily found on Taobao.

Design Files

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Update:2026-03-26 13:05:51

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