79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
from mfrc522 import MFRC522
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import utime
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# youtube short video about it https://www.youtube.com/watch?v=wE2AamTF5dg
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def uidToString(uid):
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mystring = ""
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for i in uid:
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mystring = "%02X" % i + mystring
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return mystring
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class Readers:
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def __init__(self):
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self.reader = []
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self.readerId = []
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self.previousCard = []
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def add(self, reader, readerID=""):
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self.reader.append(reader)
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if len(readerID)==0:
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readerID= "RFID #"+str(len(self.reader))
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self.readerId.append(readerID)
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self.previousCard.append([0])
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def checkReader(self,idx=0):
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if len(self.reader)> idx:
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self.reader[idx].init()
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(stat, tag_type) = self.reader[idx].request(self.reader[idx].REQIDL)
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if stat == self.reader[idx].OK:
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(stat, uid) = self.reader[idx].SelectTagSN()
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if uid != self.previousCard[idx]:
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if stat == self.reader[idx].OK:
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self.previousCard[idx] = uid
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return (self.readerId[idx] , uid)
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else:
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self.previousCard[idx] = [0]
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return (-1, [0])
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def checkAnyReader(self):
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for idx in range(len(self.reader)):
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(readerID, uid ) = self.checkReader(idx)
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if readerID != -1:
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return (readerID, uid)
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return (-1 , [0])
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# define readers
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readers = Readers()
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reader1 = MFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=1,rst=0)
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reader2 = MFRC522(spi_id=0,sck=2,miso=4,mosi=3,cs=5,rst=0)
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readers.add(reader1,"left reader")
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readers.add(reader2,"right reader")
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print("")
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print("Please place card on any reader")
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print("")
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try:
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while True:
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(readerID, uid) = readers.checkAnyReader()
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if readerID != -1:
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print(" RFID card:", uidToString(uid), " from ",readerID)
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utime.sleep_ms(50)
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except KeyboardInterrupt:
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pass
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