Dear everybody,
Sorry about my bad English, i'm not good at all.
I'm new in Arduino programming, now I try to use a MFRC522 as interrupt to wake up Arduino pro mini 3.3V. Is there any idea how to do this?
In the MFRC522 library, I see that they don't connect the IRQ pin to the Arduino, which is the interrupt output pin of MFRC522. How to make it works?
Thank you.
lnmtriet93:
In the MFRC522 library, I see that they don't connect the IRQ pin to the Arduino, which is the interrupt output pin of MFRC522.
Can you supply links to the MFRC522 board your using and also the library you refer to. If the IRQ output is physically not connected on the board your using then you may have to get creative with a soldering iron. If it's jut the library has no code to deal with IRQ then that should be a software only issue.
Riva:
Can you supply links to the MFRC522 board your using and also the library you refer to. If the IRQ output is physically not connected on the board your using then you may have to get creative with a soldering iron. If it's jut the library has no code to deal with IRQ then that should be a software only issue.
Dear,
I use the mfrc522 library on this link: GitHub - miguelbalboa/rfid: Arduino RFID Library for MFRC522 , I found it on the Arduino webpage
lnmtriet93:
I use the mfrc522 library on this link: GitHub - miguelbalboa/rfid: Arduino RFID Library for MFRC522 , I found it on the Arduino webpage
What about a link to the hardware your using. Does it break out the IRQ pin on the MFRC522 chip?
Most MFRC522 hardware that I see has exposed IRQ port. And datasheet says:
The MFRC522 indicates certain events by setting the Status1Reg register’s IRq bit and, if
activated, by pin IRQ. The signal on pin IRQ can be used to interrupt the host using its
interrupt handling capabilities. This allows the implementation of efficient host software.
So you can connect IRQ pin to Arduino.
Check it out:
Hello, since I have the same problem, I wanted to know if it had been resolved in some way, thank you.
Hi, any progress with this? I'm having the same issue 
are you using MFRC522 like This?
there's a IRC Pin on the board, but i think it's fake/not connect to 522 IRQ Pinout.