2022-05-16, 11:04 PM
It seems most likely the data wire from motor controller has broken somewhere.
Test continuity to ensure the 4 wires from controller reach the pi header.
If you get permission denied, then perhaps the user is not in the dialout or tty group? Did you try running as sudo?
Test continuity to ensure the 4 wires from controller reach the pi header.
If you get permission denied, then perhaps the user is not in the dialout or tty group? Did you try running as sudo?