I have this output on trying the rfid. I double checked all the connections and also updates my library but the output is still showing and the rfid scanner seems to be not detecting any card.
Can someone recommend an approach in order to fix this?
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I see a couple of potential problems.
- It doesn't appear that the connections to the MFRC522 board are soldered. If that's so, that's not going to work.
- It appears that you are running direct connections between a 5V Arduino and the MRFC522 board - which is a 3.3V device. I'm aware that there are many places on the web that say "oh, it's perfectly safe to do this", but I tend to believe the datasheet when it says that 0.5V over the supply voltage, or 3.8V, is the limit. But don't take my word for it: feel free to peruse the datasheet yourself and come to your own conclusions.
You can do the level conversion with little more than a 74AHC125. The wiring isn't onerous. I also prefer to use a discrete 3.3V regulator rather than rely on the limited current capacity of the 3.3V output on some Uno clones.
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Thanks to your suggestion, but I am using the 3.3V. I'll try soldering it..
You may be using 3.3V power, but your data lines are 5V. They need level shifters.
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