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X728 and Rpi4 - IOError: [Errno 121] Remote I/O error | Geekworm

X728 and Rpi4 - IOError: [Errno 121] Remote I/O error

  • Hi

    PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"

    Fresh hardware install, following GUIDE from

    Jumpers: PLD

    Step: 6 outputs:

    pi@raspberrypi:~ $ sudo python
    Traceback (most recent call last):
      File "", line 31, in <module>
        print "Voltage:%5.2fV" % readVoltage(bus)
      File "", line 11, in readVoltage
        read = bus.read_word_data(address, 2)
    IOError: [Errno 121] Remote I/O error


    EDIT: On first post i used a Rpi4B
    On the same OS, on a Rpi3 it works!

    So, how to make it work on the Rpi 4 then ?



  • @Mikal Jenssen

    Hi dear ,

    1. Do you enable I2C?
    2. Have you installed some python liberaries? More details please refer to the url below:

  • @li xia 

    Yes, as i mentioned in first post. I followed the guide on two Rpi4s.

    Only the Rpi3 worked.


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