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One card
Arduino UNO R4 WiFi
My idea is to make a smart card using, NFC or RFID tag, which can be used for multiple purposes. Such as buying tickets in bus, metro, subway etc.
Same card can be used to verify you identity, like login and logout at office, library etc
This can also do small payments in canteen of your office or college
So basically this one card can reduce the use of multiple cards and phisical money with the help of a degital website and a smart card