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, Mar 28 '15 at 10:52

score 0 · Answer 1 · edited May 23 '17 at 12:15

0

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.

edited May 23 '17 at 12:15

Community

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answered Mar 28 '15 at 17:57

Julien Spronck

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score 0 · Answer 2 · answered Mar 30 '15 at 14:21

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 '15 at 14:21

Illusionist

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This should most likely have been a comment. – swalog Apr 04 '15 at 10:13

score 0 · Accepted Answer · answered Apr 02 '15 at 05:48

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

answered Apr 02 '15 at 05:48

ashwinbhy

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RFID reader connection error with raspberry pi

3 Answers3