Thr 2019.05.16
Is the inquiry for designing the circuit, coding the solution, or both?
Do you have a re-writeable type card to start with?
https://www.mifare.net/support/forum/topic/how-to-write-and-read-data-blocks/
Which model writer?
https://mifarecards.blogspot.com/2010/09/product.html
Code snippet for reading cards
http://www.espruino.com/MFRC522
Arduino sketch to model after
https://github.com/miguelbalboa/rfid/blob/master/examples/rfid_write_personal_data/rfid_write_personal_data.ino
@Robin started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Thr 2019.05.16
Is the inquiry for designing the circuit, coding the solution, or both?
Do you have a re-writeable type card to start with?
Which model writer?
Code snippet for reading cards
Arduino sketch to model after