The mfrc522 library is used to interact with RFID readers that use the MFRC522 chip
Project description
MFRC522-python
The mfrc522 library is used to interact with RFID readers that use the MFRC522 chip.
Example Code
read.py
To read a particular sector and convert the bytes to plain string/text.
from mfrc522 import MFRC522
reader = MFRC522()
def read(trailer_block, key, block_addrs):
(status, TagType) = reader.Request(reader.PICC_REQIDL)
if status != reader.MI_OK:
return None, None
(status, uid) = reader.Anticoll()
if status != reader.MI_OK:
return None, None
id = uid
reader.SelectTag(uid)
status = reader.Authenticate(
reader.PICC_AUTHENT1A, trailer_block , key, uid)
data = []
text_read = ''
if status == reader.MI_OK:
for block_num in block_addrs:
block = reader.ReadTag(block_num)
if block:
data += block
if data:
text_read = ''.join(chr(i) for i in data)
reader.StopAuth()
return id, text_read
trailer_block = 15
key = KEY = [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]
block_addrs = [12,13,14]
id, text = read(trailer_block, key, block_addrs)
while not id:
id, text = read(trailer_block, key, block_addrs)
print(id)
print(text)
write.py
To write a particular sector.
from mfrc522 import MFRC522
reader = MFRC522()
def write(trailer_block, key, block_addrs, text):
(status, TagType) = reader.Request(reader.PICC_REQIDL)
if status != reader.MI_OK:
return None, None
(status, uid) = reader.Anticoll()
if status != reader.MI_OK:
return None, None
reader.SelectTag(uid)
status = reader.Authenticate(
reader.PICC_AUTHENT1A, trailer_block, key, uid)
reader.ReadTag(trailer_block)
if status == reader.MI_OK:
data = bytearray()
data.extend(bytearray(text.ljust(
len(block_addrs) * 16).encode('ascii')))
i = 0
for block_num in block_addrs:
reader.WriteTag(block_num, data[(i*16):(i+1)*16])
i += 1
reader.StopAuth()
return uid, text[0:(len(block_addrs) * 16)]
trailer_block = 11
block_addrs = [8, 9, 10]
key = [0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]
text = "some random text"
uid, text_in = write(trailer_block, key, block_addrs, text)
while not uid:
uid, text_in = write(trailer_block, key, block_addrs, text)
print(uid, text_in)
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