RFID with Memory! Prepaid based access control with RYRR20I_DE and Mifare Ultralight

[@TheFitimzeka]

Thanks for sharing it.

[@TasteTheCode]

You are welcome! Thanks for watching!

[@MyGSunny]

can you add credit remotely without the card?

[@TasteTheCode]

No, the credit value is saved on the card so you must have it close to the device so it is written to it.

[@TheFitimzeka]

Is it possible to use more than one NFC reader in one ESP, (i.e. one reader per relay/door)

[@TasteTheCode]

The ESP32 has hardware 3 serial ports so as long as you don't use the serial for the USB interface with computer, it can speak to 3 readers. Additionally, I guess you can also use software serial to speak to more but honestly, doing a controller per door does not add that much overhead.

[@filipporossifavilli68]

🔝🔝🔝🔝 nice project

[@TasteTheCode]

Thanks! 👍👍👍