MFRC522 on XIAO ESP32C3

Products & Technology XIAO
,
1

Hi everyone,

Was anybody been able to connect a MFRC522 Rfid/NFC module on XIAO ESP32C3?

Been trying without lucky :frowning:

2

Hi there,
And Welcome…
Can you post the Code your using we can suggest some edits.
Probably the CS for the SPI interface
HTH
GL :slight_smile: PJ

1 Like
3

Hi @PJ_Glasso , here it is

/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-rfid-nfc
 */

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN  6
#define RST_PIN 2

MFRC522 rfid(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(9600);
  SPI.begin(); // init SPI bus
  rfid.PCD_Init(); // init MFRC522

  Serial.println("Tap an RFID/NFC tag on the RFID-RC522 reader");
}

void loop() {
  if (rfid.PICC_IsNewCardPresent()) { // new tag is available
    if (rfid.PICC_ReadCardSerial()) { // NUID has been readed
      MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
      Serial.print("RFID/NFC Tag Type: ");
      Serial.println(rfid.PICC_GetTypeName(piccType));

      // print UID in Serial Monitor in the hex format
      Serial.print("UID:");
      for (int i = 0; i < rfid.uid.size; i++) {
        Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
        Serial.print(rfid.uid.uidByte[i], HEX);
      }
      Serial.println();

      rfid.PICC_HaltA(); // halt PICC
      rfid.PCD_StopCrypto1(); // stop encryption on PCD
    }
  }
}
1 Like
4

Hi there,
OK, I can try it, Which LIB are you using ,there are SEVERAL…?
can you add this SNIP to yours and find out which pins it thinks are sp & CS

 Serial.println("--------------");
 Serial.print("MOSI: ");
  Serial.println(MOSI);
  Serial.print("MISO: ");
  Serial.println(MISO);
  Serial.print("SCK: ");
  Serial.println(SCK);
  Serial.print("SS: ");
  Serial.println(SS);  
 Serial.println("--------------");

HTH
GL :slight_smile: PJ

If you could post the Compiler output first 5 lines, Last 20 b4 upload. We can narrow it down further. :v:

1 Like
5

Hi :slight_smile:

I’m using the MFRC522 lib

00:13:04.238 -> 
00:13:04.238 -> MOSI: 6
00:13:04.238 -> MISO: 5
00:13:04.238 -> SCK: 4
00:13:04.238 -> SS: 7
00:13:04.238 -> --------------

PXL_20240221_002948615.MP
PXL_20240221_002948615.MP1920×3413 424 KB

It’s working now, thank you so much :pray:

6

Hi there,
Great , Mark it as the solution so others can find it… Good troubleshooting ,You see the pins are NOT the correct ones, Use some define’s in the code for the right pins. Your picture is wired correctly I see…LOL and it will work.

#define SPI_MOSI  10
#define SPI_MISO  9
#define SPI_SCK   8
#define SS 3 // any GPIO can be used , I like to stay with the D3, D4, D5, I stay away from the D1 and D0 often they are used elsewhere and effect the Boot loader mode.

image
image690×388 36.7 KB

HTH
GL :slight_smile: PJ

1 Like
7

Hi, I did copy Danielp’s configuration, but I am having trouble getting to work.
/*

#include <SPI.h>
#include <MFRC522.h>

#define SPI_MOSI 6
#define SPI_MISO 5
#define SPI_SCK 4
#define SS 7 //

#define SS_PIN 7
#define RST_PIN 2

MFRC522 rfid(SS_PIN, RST_PIN);

void setup() {
Serial.begin(9600);
SPI.begin(); // init SPI bus
rfid.PCD_Init(); // init MFRC522

Serial.println(“Tap an RFID/NFC tag on the RFID-RC522 reader”);
}

void loop() {
if (rfid.PICC_IsNewCardPresent()) { // new tag is available
if (rfid.PICC_ReadCardSerial()) { // NUID has been readed
MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
Serial.print("RFID/NFC Tag Type: ");
Serial.println(rfid.PICC_GetTypeName(piccType));

  // print UID in Serial Monitor in the hex format
  Serial.print("UID:");
  for (int i = 0; i < rfid.uid.size; i++) {
    Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(rfid.uid.uidByte[i], HEX);
  }
  Serial.println();

  rfid.PICC_HaltA(); // halt PICC
  rfid.PCD_StopCrypto1(); // stop encryption on PCD
}

}
}

8

Hi there,

and welcome here…

So looking at your code, You should edit the post and use the code tags above “</>” paste it in there , makes it easier to read and you will get better help also. That being said , I see the same issue the WRONG pins are defined change them to match what I posted and it should work. Also it is good practise in your code to print what it thinks the pins are with some print statements, ie.

 pinMode(fspi->pinSS(), OUTPUT); //VSPI SS
  pinMode(hspi->pinSS(), OUTPUT); //HSPI SS
  digitalWrite(SS, HIGH); // <-- Set CS pin HIGH to deselect
  Serial.println("--------------");
  Serial.println(SS);
  Serial.println(MOSI); // master out, slave in
  Serial.println(MISO); // master in, slave out
  Serial.println(SCK);  // clock
  Serial.println("--------------");

HTH
GL :slight_smile: PJ :v:

ie, should be … this

#include <SPI.h>
#include <MFRC522.h>

#define SPI_MOSI 10
#define SPI_MISO 9
#define SPI_SCK 8
#define SS 20 // I like 3, 4, 5 GPIO's

#define SS_PIN 7
#define RST_PIN 2

MFRC522 rfid(SS_PIN, RST_PIN);

void setup() {
Serial.begin(9600);
SPI.begin(); // init SPI bus
rfid.PCD_Init(); // init MFRC522

Serial.println("Tap an RFID/NFC tag on the RFID-RC522 reader");
Serial.println();
Serial.println("--------------");
  Serial.println(SS);
  Serial.println(MOSI); // master out, slave in
  Serial.println(MISO); // master in, slave out
  Serial.println(SCK);  // clock
  Serial.println("--------------");
}

void loop() {
if (rfid.PICC_IsNewCardPresent()) { // new tag is available
if (rfid.PICC_ReadCardSerial()) { // NUID has been readed
MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
Serial.print("RFID/NFC Tag Type: ");
Serial.println(rfid.PICC_GetTypeName(piccType));

  // print UID in Serial Monitor in the hex format
  Serial.print("UID:");
  for (int i = 0; i < rfid.uid.size; i++) {
    Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(rfid.uid.uidByte[i], HEX);
  }
  Serial.println();

  rfid.PICC_HaltA(); // halt PICC
  rfid.PCD_StopCrypto1(); // stop encryption on PCD
  }
 }
}

try that :+1: