Hi guys, i have a project that used two RFID Reader, the project for counting tag from conveyor, in this case the reader is placed in the middle of the conveyor and the reader faces each other.
So i have question, can two RFID Reader reading one or many tag simultaneously? I tried before but when i tried to scan, the two readers did not respond, but if i scan one reader its work correctly.
Heres my arduino code
/**
* --------------------------------------------------------------------------------------------------------------------
* Example sketch/program showing how to read data from more than one PICC to serial.
* --------------------------------------------------------------------------------------------------------------------
* This is a MFRC522 library example; for further details and other examples see: https://github.com/miguelbalboa/rfid
*
* Example sketch/program showing how to read data from more than one PICC (that is: a RFID Tag or Card) using a
* MFRC522 based RFID Reader on the Arduino SPI interface.
*
* Warning: This may not work! Multiple devices at one SPI are difficult and cause many trouble!! Engineering skill
* and knowledge are required!
*
* @license Released into the public domain.
*
* 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 <Wire.h>
#include <SPI.h>
#include <MFRC522.h>
#include <SoftwareSerial.h>
#include <LiquidCrystal_I2C.h> //library penampil LCD
#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_1_PIN 10 // Configurable, take a unused pin, only HIGH/LOW required, must be diffrent to SS 2
#define SS_2_PIN 8 // Configurable, take a unused pin, only HIGH/LOW required, must be diffrent to SS 1
#define NR_OF_READERS 2
LiquidCrystal_I2C lcd(0x27,20,4); //0x3f dapat dicari dengan i2c scanner
SoftwareSerial s(5,6);
SoftwareSerial s1(2,3);
byte ssPins[] = {SS_1_PIN, SS_2_PIN};
MFRC522 mfrc522[NR_OF_READERS]; // Create MFRC522 instance.
int i = 1;
byte code[10];
String uidString;
int count0 = 0;
int count1 = 0;
/**
* Initialize.
*/
void setup() {
s.begin(9600);
s1.begin(9600);
Serial.begin(9600); // Initialize serial communications with the PC
while (!Serial);
SPI.begin(); // Init SPI bus
for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
mfrc522[reader].PCD_Init(ssPins[reader], RST_PIN); // Init each MFRC522 card
Serial.print(F("Reader "));
Serial.print(reader);
Serial.print(F(": "));
mfrc522[reader].PCD_DumpVersionToSerial();
}
lcd.init();
lcd.init();
lcd.backlight(); //menghidupkan lampu latar LCD
lcd.setCursor (3,0);
lcd.print("Final Project");
delay (1000);
lcd.clear();
}
/**
* Main loop.
*/
void loop() {
lcd.setCursor (0,0);
lcd.print("SCAN RFID");
for (uint8_t reader = 0; reader < NR_OF_READERS; reader++) {
// Look for new cards
if(reader == 0){
reader0(reader);
}else if(reader == 1){
reader1(reader);
}
}
}
/** SCAN RFID TAG READER0 */
void reader0(int reader){
if (mfrc522[reader].PICC_IsNewCardPresent() && mfrc522[reader].PICC_ReadCardSerial()) {
Serial.println();
Serial.print(F("Reader "));
Serial.print(reader);
// Show some details of the PICC (that is: the tag/card)
Serial.println();
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));
count0++;
lcd.setCursor (0,0);
Serial.print("Counter ");
Serial.print(reader);
Serial.print(" = ");
Serial.print(count0);
Serial.println();
s.write(count0);
}
mfrc522[reader].PICC_HaltA();
mfrc522[reader].PCD_StopCrypto1();
}
/** SCAN RFID TAG READER1 */
void reader1(int reader){
if (mfrc522[reader].PICC_IsNewCardPresent() && mfrc522[reader].PICC_ReadCardSerial()) {
Serial.println();
Serial.print(F("Reader "));
Serial.print(reader);
Serial.println();
// 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));
count1++;
lcd.setCursor (0,0);
Serial.print("Counter ");
Serial.print(reader);
Serial.print(" = ");
Serial.print(count1);
Serial.println();
s1.write(count1);
}
mfrc522[reader].PICC_HaltA();
// Stop encryption on PCD
mfrc522[reader].PCD_StopCrypto1();
}
/**
* 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);
}
}
anyway sorry for my bad english 