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pn532i2c.writeCommand exception occured #3

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igoralves98 opened this issue Feb 19, 2016 · 1 comment

igoralves98 commented Feb 19, 2016

Hi,
first of all thanks for sharing this library.

When I run your program, using i2c connection, everything runs ok.

But after a few moments I get the error:

pn532i2c.writeCommand exception occured: Error writing to /dev/i2c-1 at address 0x24 to address 0x24. Got -20001.

Do you know what could be causing this?

kibukamusoke commented Jun 29, 2016

Sounds like an issue when using Raspberry pi.
There's 3 possibilities I can think of:

Try running the app as root. :)
Your pn532 connection is loose. You could check to make sure the contacts are ok. (You notice this error when you disconnect your pn532 from your rPi.
I2C address Clash. You could have another device on the same I2C connection that is interfering / is sharing the same address.

Hope this helps.

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