BTN SHIM reports I/O error

I can’t get any of the Button SHIM examples to work. I get this error:

Traceback (most recent call last):
File “”, line 4, in
import buttonshim
File “/usr/local/lib/python2.7/dist-packages/buttonshim/”, line 379, in
File “/usr/local/lib/python2.7/dist-packages/buttonshim/”, line 182, in _init
_bus.write_byte_data(ADDR, REG_CONFIG, 0b00011111)
IOError: [Errno 121] Remote I/O error

I’ve tried two different Raspberry Pis (a Pi Zero W and a Pi 3 now). I’m planning to use it together with the Unicorn HAT. The Unicorn HAT is working fine. I have also tried removing it but the button SHIM still doesn’t work.

Any pointers appreciated, thank you!

Just to update that I have now tried using a clean SD card with the latest OS build on it, and the Button SHIM software as the only added software, and I’m seeing the same result.

I’m guessing your running it in python 2, try running it in idle3/python3. It may have nothing to do with your error but can’t hurt to try it.

Thanks for your help, alphanumeric. I have just fixed this. It was a soldering issue.


Good to hear you got it working.

1 Like