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 Welcomeā€¦
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 SEVERALā€¦?
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:

Iā€™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.MP1920Ɨ3413 424 KB

Itā€™s working now, thank you so much :pray:

6

Hi there,
Great , Mark it as the solution so others can find itā€¦ Good troubleshooting ,You see the pins are NOT the correct ones, Use some defineā€™s in the code for the right pins. Your picture is wired correctly I seeā€¦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
image690Ɨ388 36.7 KB

HTH
GL :slight_smile: PJ

1 Like
7

Hi, I did copy Danielpā€™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(ā€œTap an RFID/NFC tag on the RFID-RC522 readerā€);
}

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 hereā€¦

So looking at your code, You should edit the post and use the code tags above ā€œ</>ā€ 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 ā€¦ 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: