def pollPendingPracticals(self):
if self.parser.course_id == None:
# Try to get pending practicals
pending_practical = self.parser.query_pending_practicals(
self.pi_id)
if pending_practical.error != None:
print("There was an error:" + pending_practical.error)
elif pending_practical.pending:
print("Practical for course: " + pending_practical.course_id +
" started")
LED.asyncGreen()
# Inform fingerprint about practical
self.fingerprint_pipe.send(pending_practical.course_id)
# Wait 10 seconds
time.sleep(10)
def readNFC(parser, fingerprint_pipe, LCD_pipe):
# Create an object of the class MFRC522
MIFAREReader = MFRC522()
# This loop keeps checking for chips. If one is near it will get the UID
while True:
# Message for recording attandance
if parser.course_id == None:
LCD_pipe.send(
" SWIPE CARD TO START PRACTICAL")
else:
LCD_pipe.send(
"RECORD THE ATTENDANCE...")
# Scan for cards
(status,
TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
# Get the UID of the card
(status, uid) = MIFAREReader.MFRC522_Anticoll()
if parser.end_time != None and parser.end_time < time.localtime():
parser.course_id = None
# If we have the UID, continue
if status == MIFAREReader.MI_OK:
#in_progress = True
print("CARD DETECTED")
# UID saved as nfcData
nfc_data = str(uid[0]) + str(uid[1]) + str(uid[2]) + str(
uid[3]) + str(uid[4])
print(nfc_data)
if parser.course_id == None:
course_information = parser.get_course("nfc", nfc_data)
# If no error has occured, turn on Green LED and write on LCD
if course_information.error == None:
fingerprint_pipe.send(course_information.course_id)
LED.asyncGreen()
print("started practical")
LCD_pipe.send("COURSE ID " + course_information.course_id +
" INITIALIZED")
if course_information.templates != None:
fingerprint_pipe.send(course_information.templates)
# turn on Red LED and writte error message on LCD
else:
LED.asyncRed()
LCD_pipe.send(course_information.error)
print(course_information.error)
else:
attendance_information = parser.record_attendance(
"nfc", nfc_data)
# If no error has occured, turn on Green LED and write on LCD
if attendance_information.error == None:
LED.asyncGreen()
LCD_pipe.send("ID: " + attendance_information.student_id +
" RECORDED")
# turn on Red LED and write error message on LCD
else:
LED.asyncRed()
LCD_pipe.send(attendance_information.error)
print("could record attendace")
# sleep for 1 second before reading the card again
time.sleep(1)
