CardKB on Raspberry Pi 5

[u/silverdatchery]

as the title says - anyone with any luck setting up an m5 cardkb on a pi 5? followed the instructions on this github post. running a standard 8gb pi 5 with pi os installed. while the software installs went fine, running "sudo cardkb &" returns this as a repeating error:

OSError: [Errno 121] Remote I/O error
Traceback (most recent call last):
File "/usr/local/lib/python3.13/dist-packages/cardkb/_main_.py", line 37, in main
data = bus.read_byte(address)

the pins are properly connected, i2c is on. only thing i haven't tried troubleshooting yet is deleting the scripts altogether and attempting a fresh install. am i overlooking anything obvious in solving this?

[u/Significant-Price695]

Small correction to the other reply: CardKB's address is 0x5f, so HCharlesB has the right one. What does your scan show?