RFID Reading Script for Doorman

doorman.py

#!/usr/bin/env python
#Run with root privileges, we may eventually want it to be a daemon but whatever
import serial# http://pyserial.sourceforge.net/

port = "/dev/ttyUSB0"  # change port name to match the port of the card reader, should always be somewhere in dev
ser = serial.Serial(port, 2400)   # open serial port

print "Enabling the module...",
ser.setDTR(True)# the module is enabled by asserting DTR
print "Success!"

print "Reading tag's unique serial number...",
while True:
    buf = ser.read(12)  # get bytes (will block until received)- Not sure ow many bytes the tag is. 12 seems like a good estimate.
    if buf[0] == chr(0x0A):# if valid data received with no error, continue    
		for i in range(1,len(buf)-1):# display data (ignore final 0x0D byte sent by the reader)
			tagNum = tagNum + buf[i]
			#print buf[i],
        
		#print
		print tagNum
	else:
		print "Invalid Tag"	
     #Now we check against the file of tags
     #If true, then we add the username and datetime data to the log
     # And run the motor, sleep for a second then run the motor
     # in the reverse direction
print "Disabling the module...",
ser.setDTR(False)# the module is disabled by de-asserting DTR
print "Success!"

ser.close()#Release the serial port