issues with MFRC522 AccessControl example

Projects General Guidance
1

I'm trying to set up an RFID lock thing with a solenoid, following this tutorial.

I've set up my master card and when I boot up the serial monitor I get:

Access Control Example v0.1
MFRC522 Software Version: 0x92 = v2.0
-------------------
Master Card's UID
E5B08EB0
-------------------
Everything Ready
Waiting PICCs to be scanned

When I scan another card this happens:

Scanned PICC's UID:
AB194E9

... and then it won't respond to any other card. The same thing happens when I enter programming mode with the master card. It prompts me to scan a different card and then when I do it seems to freeze up. I can't even use the master card to exit program mode afterwards.

Everything Ready
Waiting PICCs to be scanned
Scanned PICC's UID:
E5B08EB0
Hello Master - Entered Program Mode
I have 255 record(s) on EEPROM
Scan a PICC to ADD or REMOVE to EEPROM
Scan Master Card again to Exit Program Mode
-----------------------------
Scanned PICC's UID:
AB194E9

Does anyone know what's going on here?

2

Are u using the example AccessControl?

It seems that no successRead is present! (the program will not go further while you are not getting a successful read)

Go into code and write some serial.print to see where the code stops...

Can you upload your code?

3

Hi,
Why have you two threads for the same project?

https://forum.arduino.cc/index.php?topic=507023.0

Tom... :slight_smile:

4

I figured they were separate issues so I made different threads. I guess I should have kept it in the same one.

Yes, I am using the example AccessControl.

... and I solved the problem! I think I made a weird wiring mistake at one point and accidentally filled up EEPROM with the records for just one card.

After clearing EEPROM it started working as intended.