Rc522 + argon (unable to scan cards)

[josephb]

Hello ,
I connected an rc522 module to my particle argon and tried using the MFRC522
library from the web ide but I m unable to read any data from the provided cards.

I didn’t follow the wiring instructions since they were made for spark devices.

My connections:
SDA : A4
RST : D6
MISO : MI
MOSI : MO
SCK : SCK

I changed the lines that define the SDA and RST pins accordingly .

Thanks for your help!

[armor]

How have you set the pin values for SDA (aka SS) and RST in your sketch?

How have you connected IRQ?

Also, the SPI bus speed may be an issue - it is using DIV8 - maybe you should set the speed to be 2MHz. To do that you would need to edit the .cpp file where the SPI is configured.

[josephb]

Hi,
I changed the SS pin to D5 and haven’t connected irq.
Here are some code snippets that might be relevant.

[armor]

Is there a reason to use SPI1 rather than SPI and have you connected SCK, MOSI, MISO pins to secondary port? Suggests not since you have used RST_PIN on D2?

• SCK => D2
• MOSI => D3
• MISO => D4

[josephb]

I tried spi1 because I am on device os 4.2.0 and according to the particle spi documention spi1 used to be faster prior to 5.3.1 (unless I totally misunderstood)

This is exactly how I connected the module :

Btw thanks for your help !