Hello.
So... I tried connected this way: https://i.ytimg.com/vi/HmGmFknAIqc/maxresdefault.jpg
But it still doesn't work.
I tested it on Arduino Mega, Arduino Uno, now I have Arduino Pro Mini and...
Wire:
RFID 1:
3.3V - 3.3V Mega
Reset - Pin 9 Pro Mini
GND - GND Pro Mini
MOSI - 11
MISO - 12
SCK - 13
SDA - 8
RFID 2:
3.3V - 3.3V Mega
Reset - Pin 10 Pro Mini
GND - GND Pro Mini
MOSI - 11
MISO - 12
SCK - 13
SDA - 7
When both is connected:
Reader 0: Firmware Version: 0x0 = (unknown)
WARNING: Communication failure, is the MFRC522 properly connected?
Reader 1: Firmware Version: 0x0 = (unknown)
WARNING: Communication failure, is the MFRC522 properly connected?
Second RFID without VCC
Reader 0: Firmware Version: 0x12 = (unknown)
Reader 1: Firmware Version: 0x0 = (unknown)
WARNING: Communication failure, is the MFRC522 properly connected?
Reader 0: Card UID: 76 C5 5D 8E
PICC type: MIFARE 1KB
First RFID without VCC
Reader 0: Firmware Version: 0x0 = (unknown)
WARNING: Communication failure, is the MFRC522 properly connected?
Reader 1: Firmware Version: 0x12 = (unknown)
Reader 1: Card UID: 76 C5 5D 8E
PICC type: MIFARE 1KB
And code example:
/**
* ----------------------------------------------------------------------------
* This is a MFRC522 library example; see https://github.com/miguelbalboa/rfid
* for further details and other examples.
*
* NOTE: The library file MFRC522.h has a lot of useful info. Please read it.
*
* Released into the public domain.
* ----------------------------------------------------------------------------
* This sample shows how to read and write data blocks on a MIFARE Classic PICC
* (= card/tag).
*
* BEWARE: Data will be written to the PICC, in sector #1 (blocks #4 to #7).
*
*
* Typical pin layout used:
* -----------------------------------------------------------------------------------------
* MFRC522 Arduino Arduino Arduino Arduino Arduino
* Reader/PCD Uno/101 Mega Nano v3 Leonardo/Micro Pro Micro
* Signal Pin Pin Pin Pin Pin Pin
* -----------------------------------------------------------------------------------------
* RST/Reset RST 9 5 D9 RESET/ICSP-5 RST
* SPI SS 1 SDA(SS) ** custom, take a unused pin, only HIGH/LOW required **
* SPI SS 2 SDA(SS) ** custom, take a unused pin, only HIGH/LOW required **
* SPI MOSI MOSI 11 / ICSP-4 51 D11 ICSP-4 16
* SPI MISO MISO 12 / ICSP-1 50 D12 ICSP-1 14
* SPI SCK SCK 13 / ICSP-3 52 D13 ICSP-3 15
*
*/
#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN 9 // Configurable, see typical pin layout above
#define RST_PIN1 10
#define SS_1_PIN 8 // Configurable, take a unused pin, only HIGH/LOW required, must be diffrent to SS 2
#define SS_2_PIN 7 // Configurable, take a unused pin, only HIGH/LOW required, must be diffrent to SS 1
#define NR_OF_READERS 2
byte ssPins[] = {SS_1_PIN, SS_2_PIN};
MFRC522 mfrc522[NR_OF_READERS]; // Create MFRC522 instance.
/**
* Initialize.
*/
void setup() {
Serial.begin(9600); // Initialize serial communications with the PC
while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
SPI.begin(); // Init SPI bus
//for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
mfrc522[0].PCD_Init(ssPins[0], RST_PIN); // Init each MFRC522 card
Serial.print(F("Reader "));
Serial.print(0);
Serial.print(F(": "));
mfrc522[0].PCD_DumpVersionToSerial();
mfrc522[1].PCD_Init(ssPins[1], RST_PIN1); // Init each MFRC522 card
Serial.print(F("Reader "));
Serial.print(1);
Serial.print(F(": "));
mfrc522[1].PCD_DumpVersionToSerial();
//}
}
/**
* Main loop.
*/
void loop() {
for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
// Look for new cards
if (mfrc522[reader].PICC_IsNewCardPresent() && mfrc522[reader].PICC_ReadCardSerial()) {
Serial.print(F("Reader "));
Serial.print(reader);
// Show some details of the PICC (that is: the tag/card)
Serial.print(F(": Card UID:"));
dump_byte_array(mfrc522[reader].uid.uidByte, mfrc522[reader].uid.size);
Serial.println();
Serial.print(F("PICC type: "));
MFRC522::PICC_Type piccType = mfrc522[reader].PICC_GetType(mfrc522[reader].uid.sak);
Serial.println(mfrc522[reader].PICC_GetTypeName(piccType));
// Halt PICC
mfrc522[reader].PICC_HaltA();
// Stop encryption on PCD
mfrc522[reader].PCD_StopCrypto1();
} //if (mfrc522[reader].PICC_IsNewC
} //for(uint8_t reader
}
/**
* Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
for (byte i = 0; i < bufferSize; i++) {
Serial.print(buffer[i] < 0x10 ? " 0" : " ");
Serial.print(buffer[i], HEX);
}
}
Do you have any idea?