RFID reader connection error with raspberry pi

Question

We are trying to read RFID tags using raspberry pi b+. We used following script in the python .

import serial import time serial=serial.Serial("/dev/ttyUSB0", baudrate=2400) while True: if serial.inWaiting()>0: read_result=serial.read(12) print("Read card {0}",format(read_result.decode("utf-8","replace"))) print("Sleeping 2 sec") time.sleep(2) serial.flushInput()

On reading the tag it gives the error as:

File "/home/pi/rfidtry/try.py",line 7, in <module> print("Read card {0}",format(read_result.decode("utf-8","replace"))) UnicodeEncodeError: 'ascii' codac can't encode character u'\uffd' in position 2 :ordinal not in range(128)

Can you omit the replace and show the output? (It should give you a slightly different error message) — hek2mgl
– hek2mgl, Commented Mar 28, 2015 at 10:52

Community · Accepted Answer · 2017-05-23 12:15:32Z

As suggested in this post, it might work if you encoded your unicode string first to ascii and then decode it.

read_result.encode('ascii','replace').decode('utf-8')

Of course, you will lose the non-working characters.

Illusionist · Accepted Answer · 2015-03-30 14:21:18Z

0

Did you try this

print read_result

and see if it works (instead of )

print("Read card {0}",format(read_result.decode("utf-8","replace")))

answered Mar 30, 2015 at 14:21

Illusionist

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1 Comment

swalog Over a year ago

This should most likely have been a comment.

ashwinbhy · Accepted Answer · 2015-04-02 05:48:27Z

The problem was with the baudrate. The earlier reader i used was 2400 but the one i am using now is 9600.

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