Good morning everyone, Could anyone tell me how to use the IRQ pin of the MFR522 card with Arduino UNO? All the examples I have found don't work. Thank you Stefano

MFRC522.pdf 813.67 KB 8.4 on the data sheet

ok, thanks...but which registers should i configure?

You have not described your problem in any detail so the solution can not be given in detail. The data sheet tells you the interrupt setup for this chip. How you use it to resolve your problem is, as yet, unknown. There are lots of tutorials and threads on the use of interrupts if you wish to sea…

There are a lots of tutorials but nobody explains how to configure registers to use IRQ pin. My question was very simple, i need a minimal example or tutorial that explain how configure registers to enable IRQ. I've found this for example: miguelbalboa/rfid/blob/master/examples/MinimalInte…

[image] stefano_gunella: ..but it doesn't work. please specify what does it mean how does it work and how does it differ from what you expect?

I have a machine that is broken, can you tell me how to fix it? Think about the information in that statement that is missing but would be important to know before you can answer

Sorry but the example of the machine is not appropriate... I simply asked for a code example for MFRC522 that is capable of activating an Interrupt on Arduino...I don't know what else to add. Can you point me to one of the many tutorials you found in which the IRQ PIN is used or do I have to think…

as i see you have an example ready to work with complete hardware setup. Do you try it? Whats the result?

The usual advice is don't use interrupts unless you have to. Beginners often perceive the need to use interrupts when they actually don't have to. Why do you believe you need to use an interrupt?

I need to use Interrupt because I need to use 2 RFID MFRC522 on the same Arduino UNO. Using the interrupt I could figure out which of the two devices has read a card and act accordingly. So the first could send an IRQ to PIN 2 and the second to PIN 3. But beyond the practical case, I might just w…

MFRC522 - Interrupt example

Projects Programming

pmagowan July 6, 2022, 10:53am 2

8.4 on the data sheet

Topic		Replies	Views
MFRC522 IRQ line General Discussion	3	114	December 21, 2024
Interruptions et capteur RC522 sur Nano Français	4	71	April 12, 2026
Wake up Arduino using MFRC522 as interrupt General Guidance	7	9159	February 26, 2018
RFID-interrupt pin setup Jobs and Paid Consultancy	3	4545	April 29, 2015
How to set Interrupt(IRQ) in RC522 Programming	2	8781	April 13, 2019

MFRC522 - Interrupt example

Related topics