Use a 3v3 regulator from the 5V line, you need caps on the input and output as well.How can I drop the 5v supply to 3.3 so I can power the reader from this?
Can you run the reader from such a low voltage? If you can it is most unusual.I am powering the reader I am connecting from the 3v3
TTL is 5V not 3v3 are you sure you are not trying to drive 5V into the Pi?so got the ttl version
All the time when not outputting data the signal level should be high (3v3)Should the uart pins be outputting 3v all the time?
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