Add multi card example

examples/MultiReaders.py

@@ -0,0 +1,76 @@
+from mfrc522 import MFRC522
+import utime
+
+
+def uidToString(uid):
+    mystring = ""
+    for i in uid:
+        mystring = "%02X" % i + mystring
+    return mystring
+    
+
+class Readers:
+    
+    def __init__(self):
+        self.reader = []
+        self.readerId = []
+        self.previousCard = []
+
+   
+    def add(self, reader, readerID=""):
+        self.reader.append(reader)
+        if len(readerID)==0:
+            readerID= "RFID #"+str(len(self.reader))
+        self.readerId.append(readerID)
+        self.previousCard.append([0])
+    
+    def checkReader(self,idx=0):
+        if len(self.reader)> idx:
+            self.reader[idx].init()
+            (stat, tag_type) = self.reader[idx].request(self.reader[idx].REQIDL)
+            if stat == self.reader[idx].OK:
+                (stat, uid) = self.reader[idx].SelectTagSN()
+                if uid != self.previousCard[idx]:
+                    if stat == self.reader[idx].OK:
+                        self.previousCard[idx] = uid
+                        return (self.readerId[idx] , uid)
+            else:
+                self.previousCard[idx] = [0]
+        return (-1, [0])
+    
+    
+    def checkAnyReader(self):
+        for idx in range(len(self.reader)):
+            (readerID, uid ) = self.checkReader(idx)
+            if readerID != -1:
+                return (readerID, uid)
+        return (-1 , [0])
+    
+    
+# define readers
+
+readers = Readers()
+
+              
+reader1 = MFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=1,rst=0)
+
+reader2 = MFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=5,rst=0)
+
+readers.add(reader1,"left reader")
+readers.add(reader2,"right reader")
+
+
+print("")
+print("Please place card on any reader")
+print("")
+
+try:
+    while True:
+
+        (readerID, uid) = readers.checkAnyReader()
+        if readerID != -1:
+            print(" RFID card:", uidToString(uid), " from ",readerID)
+        utime.sleep_ms(50)                
+
+except KeyboardInterrupt:
+    pass