Pyscan Examples

Last updated last month

This basic example shows how to read an NFC card and authenticate it using a pre-defined access list.

from pyscan import Pyscan
from MFRC630 import MFRC630
import time
import pycom
import _thread
VALID_CARDS = [[0x43, 0x95, 0xDD, 0xF8],
[0x43, 0x95, 0xDD, 0xF9]]
py = Pyscan()
nfc = MFRC630(py)
RGB_BRIGHTNESS = 0x8
RGB_RED = (RGB_BRIGHTNESS << 16)
RGB_GREEN = (RGB_BRIGHTNESS << 8)
RGB_BLUE = (RGB_BRIGHTNESS)
# Make sure heartbeat is disabled before setting RGB LED
pycom.heartbeat(False)
# Initialise the MFRC630 with some settings
nfc.mfrc630_cmd_init()
def check_uid(uid, len):
return VALID_CARDS.count(uid[:len])
def discovery_loop(nfc, id):
while True:
# Send REQA for ISO14443A card type
atqa = nfc.mfrc630_iso14443a_WUPA_REQA(nfc.MFRC630_ISO14443_CMD_REQA)
if (atqa != 0):
# A card has been detected, read UID
uid = bytearray(10)
uid_len = nfc.mfrc630_iso14443a_select(uid)
if (uid_len > 0):
if (check_uid(list(uid), uid_len)) > 0:
pycom.rgbled(RGB_GREEN)
else:
pycom.rgbled(RGB_RED)
else:
# No card detected
pycom.rgbled(RGB_BLUE)
nfc.mfrc630_cmd_reset()
time.sleep(.5)
nfc.mfrc630_cmd_init()
# This is the start of our main execution... start the thread
_thread.start_new_thread(discovery_loop, (nfc, 0))

You can find this, and all the other examples in our pycom-libraries GitHub repository