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lib/Arduino_MFRC522v2-master/examples/ReadUidMultiReader/ReadUidMultiReader.ino

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+/*
+ * --------------------------------------------------------------------------------------------------------------------
+ * Example 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/OSSLibraries/Arduino_MFRC522v2
+ *
+ * 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
+ * -----------------------------------------------------------------------------------------
+ * 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
+ *
+ * Not found? For more see: https://github.com/OSSLibraries/Arduino_MFRC522v2#pin-layout
+ */
+
+// Note for i2c:
+// With i2c possible if every device has a own unique address.
+// Otherwise a i2c multiplexer is required, which requires a own implementation of MFRC522Driver.h. 
+
+#include <MFRC522v2.h>
+#include <MFRC522DriverSPI.h>
+#include <MFRC522DriverPinSimple.h>
+#include <MFRC522Debug.h>
+
+MFRC522DriverPinSimple ss_1_pin(10); // Configurable, take an unused pin, only HIGH/LOW required, must be different to SS 2.
+MFRC522DriverPinSimple ss_2_pin(8); // Configurable, take an unused pin, only HIGH/LOW required, must be different to SS 1.
+
+MFRC522DriverSPI driver_1{ss_1_pin};
+MFRC522DriverSPI driver_2{ss_2_pin};
+
+MFRC522 readers[]{driver_1, driver_2};   // Create MFRC522 instance.
+
+/**
+ * Initialize.
+ */
+void setup() {
+  Serial.begin(115200);  // Initialize serial communications with the PC for debugging.
+  while (!Serial);     // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4).
+  
+  for (MFRC522 reader : readers) {
+    reader.PCD_Init(); // Init each MFRC522 card.
+    Serial.print(F("Reader "));
+    static uint8_t i = 0;
+    i++;
+    Serial.print(i);
+    Serial.print(F(": "));
+    MFRC522Debug::PCD_DumpVersionToSerial(reader, Serial);
+  }
+}
+
+/**
+ * Main loop.
+ */
+void loop() {
+  // Look for new cards.
+  for (MFRC522 reader : readers) {
+    if (reader.PICC_IsNewCardPresent() && reader.PICC_ReadCardSerial()) {
+      Serial.print(F("Reader "));
+      static uint8_t i = 0;
+      i++;
+      Serial.print(i);
+      
+      // Show some details of the PICC (that is: the tag/card).
+      Serial.print(F(": Card UID:"));
+      MFRC522Debug::PrintUID(Serial, reader.uid);
+      Serial.println();
+      
+      Serial.print(F("PICC type: "));
+      MFRC522::PICC_Type piccType = reader.PICC_GetType(reader.uid.sak);
+      Serial.println(MFRC522Debug::PICC_GetTypeName(piccType));
+      
+      // Halt PICC.
+      reader.PICC_HaltA();
+      // Stop encryption on PCD.
+      reader.PCD_StopCrypto1();
+    }
+  }
+}