What is the problem?
I am having problems getting the USB serial connection working between the Raspberry PI and the Ender 3 Pro. When I click on the "Connect" button, the Ender UI screen seems to reset and I get a status message that states: " Error: Connection error, see Terminal tab" The errors in the Terminal Tab seem to be a timeout issue:
Changing monitoring state from "Offline" to "Detecting serial port"
Serial port list: ['/dev/ttyUSB0', '/dev/ttyUSB0', '/dev/ttyUSB0']
Changing monitoring state from "Detecting serial port" to "Error: Connection error, see Terminal tab"
Unexpected error while connecting to serial port: AUTO IspError: ''Timeout'' @ comm.py:_openSerial:2611 (hook default)
What did you already try to solve it?
I have tried two different Raspberry PI (Model B+ and B+ V2).
I have tried different USB cables
I tried printing that little thing to isolate +5V
I have tried connecting with the Ender 3 power on and off
I opened up one of my USB cables and cut the 5 V to isolate it
I tried pushing the button 500 times in a row
I tried a number of different power-on sequences and plug-in sequences.
None of the above have seemed to change what is happening
Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, ...)
I am running OctoPrint 1.3.11
OctoPi Version 0.16.0, running on Raspberry Pi 3 Model B Rev 1.2
I just bought the Ender 3 Pro, not sure what FW it actually has, but I haven't changed the firmware yet.