How does ACR122u work on the phone in 2020

[@nity9528]

can u do a simple brief video from A-Z...like how decode and find the keys and how to add up money to it

[@lernajadebadoles7263]

Do you have a source code for this as a guide? I am currently having difficulty integrating writing of cards function using ACR122U NFC USB. Hoping for a solution. Thank you 😊

[@mtoolstec]

RFID Tools app is an open-source app that supports ACR122U. But it's not good for the beginner. I suggest you use the SDK provided by ACR and use the APDU command to control the reader.