nhuthuanphan:
I have problem because I want to connect two device to my arduino. First is module mfrc522 and module SDCard.Both are with SPI interface. Please help me
I am using library MFRC522.h and SD libary in arduino. Thanks
As you have posted your question here I presume you have carefully studied the earlier Replies in this Thread and tried the various suggestions.
You need to post the program that represents your best attempt, tell us what results you got and tell us what you want the program to do that is different.
...R