i am new in coding for arduino. I need some help with the project i'm working on. my project is a object tracking by using the rfid rc522 for inventory system. so i need to have multi reader in this project. i would like to have 4 reder that will work at the same time. this is how i want my project to work: 1. there is going to be 3 or 4 reader rc522, 1 i2s lec and leds. 2. one rfid tag will be use as the master card. the master card have the ability to add or remove card. 3. when 1 tag is tapped on 1 reader, the card quantity at the reader that it tapped will increase. example when we tap the tag at reader1, reader1 will add 1 card into its memory.


  • 1
    And what exactly is your problem with that? You didn't ask a question – chrisl Jun 16 '20 at 6:50
  • what do you need help with ... right now, your post is like I'm new to house building and I need some help with a project. I'm building a house with 3 bedrooms and a basement suite. – jsotola Jun 16 '20 at 7:07
  • i want to have this coding to work with 4 rfid reader connected to arduino uno. – SHIE Jun 16 '20 at 7:20
  • 1
    Still it is not clear, what your problem is. You need to narrow down the problem more. You already have a big code, which uses the MFRC522 library to interface with the RFID reader. Is that working? If not: How exactly is it not working? What did you expect and what actually happens? Are the examples working, that normally come with such a library? Or is the problem, that you don't know how to extent the code? – chrisl Jun 16 '20 at 9:51
  • 1
    my problem is i dont know how to modified this code so it will work on 4 rfid reader with exactly the same as the code is now. the code here is working fine with only 1 reader. i wanted to extend it to 4 reader. so how should i do the modification on the code? – SHIE Jun 16 '20 at 10:25

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.