I have mfrc522 and sd card module for Arduino. I connect them properly.
I use MFRC522.h for mfrc and SD.h build in Arduino ide. And when I connect module sepaetly they work properly. But when I connected them together and set different SS_pIN for them (8 for mfrc and default 4 for SD, nothing of module work. None of this module sends any response. And I don't know why !!!!
My cod is here:
I have this module: