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Using MFRC522 RFID Reader with PIC16F877
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PCM programmer



Joined: 06 Sep 2003
Posts: 21227

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PostPosted: Sat Jul 27, 2019 12:52 pm     Reply with quote

bharath0209 wrote:

// Note:Connect MFRC522 module to 5v PIC without any Level converter.
// It'll work fine.

I had to increase the supply voltage to 3.7 volts for it to work perfectly.

This strongly indicates a level-shifter issue. You are probably missing the
level shifter circuits. Look at the schematic for your MFRC522 product.
Does it have built-in level shifter circuits ?
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