Author Topic: RC522 PCB Antenna Problem  (Read 2993 times)

0 Members and 1 Guest are viewing this topic.

Offline efelTopic starter

  • Newbie
  • Posts: 2
RC522 PCB Antenna Problem
« on: August 05, 2016, 12:08:52 am »
Hello everybody, how are you doing?

I'm developing a custom Arduino UNO board that includes a MIFARE RC522 chip. The communications between the ATMEGA328 and the RC522 seems to be working since the serial console is showing this:

Looking for MFRC522.
Found chip RC522 Firmware version: 0x92

But I'm not able to read any tag. I have a RC522 shield for testing and with it I can read all my tags.

I made some mistakes in the design of the PCB antenna. At the beginning I was having a gain of 230mV and 13.56 MHz, so my first impressions were that the strength of the signal was the problem, I made some cuts to the board and now the oscilloscope shows about 10.7V and 13.56 MHz (Wave.jpg). I don't have the expertise to know what is wrong with my design. I attached the eagle project. It's a little frustrating because my first attempt was using a PIC16@3.3v (white board of the Boards.jpg) and the board works but now with Arduino@5V with a shifter I have communication with the chip but I'm not able to read anything.

This is the sample code and tutorial I'm using

Any suggestion is appreciated

Thanks and best regards.

« Last Edit: August 05, 2016, 02:53:16 am by efel »

Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo