Anyone get Pi4 to work via serial to Einsy RAMbo board for Octoprint?
 

Anyone get Pi4 to work via serial to Einsy RAMbo board for Octoprint?  

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scott_barton
(@scott_barton)
Active Member

Has anyone successfully used a Pi4 for Octoprint not using the USB, but connected to the Einsy RAMbo board via serial, much like the Pi Zero W?  

I can connect my Pi4 no problem via USB, however I want to connect my Raspberry Pi 4 2GB to my Prusa MK3S via the serial port on the GPIO (similar to their Pi Zero W install) and just can't seem to get it to work (won't connect).  

I then tried with a Pi3B+ board, starting from scratch doing the exact same thing I did for the Pi4 board and was able to get the Pi3 board to work via serial GPIO to the Einsy board. I moved that SD card over to the pi4 board and still the same issue, pi4 will not connect.

 

This is the log from the Terminal:

<Serial Port: Auto>
<BaudRate: Auto>

Changing monitoring state from "Offline" to "Detecting serial port"
Serial port list: ['/dev/ttyAMA0', u'/dev/ttyS0']
Trying /dev/ttyAMA0
Could not connect to or enter programming mode on /dev/ttyAMA0, might not be a printer or just not allow programming mode

This topic was modified 5 months ago 2 times by scott_barton
Posted : 24/06/2020 2:39 pm
scott_barton
(@scott_barton)
Active Member

Turns out the board was bad.  I swapped it out with another rPi4 and it worked.    

Feel free to delete the thread.

This post was modified 5 months ago by scott_barton
Posted : 24/06/2020 11:55 pm
swift_phoenix
(@swift_phoenix)
Active Member

@scott_barton

Hey Scott,

Where was the instructions you used? I am getting 8gb pi4 soon, and want to do the same.

 

Thanks

Posted : 29/06/2020 4:54 am
k7zpj
(@bruce-p4)
Estimable Member
Posted by: @email-1

@scott_barton

Hey Scott,

Where was the instructions you used? I am getting 8gb pi4 soon, and want to do the same.

 

Thanks

The RPi 4B 8gb is a 64 bit board and takes a different Octpi image that is currently in testing.

You can follow the status of the image at this link on the Octoprint forum:  octoprint-on-a-pi4-8gb

Posted : 29/06/2020 6:54 am
scott_barton
(@scott_barton)
Active Member

@email-1

Here are instructions for installing a rPi Zero.  Follow the instructions for using OctoPi instead of PrussaPrint.    

https://help.prusa3d.com/en/article/octoprint-building-an-image-for-raspberry-pi-zero-w_2182

 

Here is the modified case and instructions for using a Raspberry Pi3/4 instead of the Zero W. 

https://www.prusaprinters.org/prints/9284-prusa-i3-octoprint-raspberry-pi-case

 

As noted above, the rPi 4 8GB will have issues or be difficult as it is 64bit only and not supported as OctoPi is 32bit. 

https://octoprint.org/download/    "Unknown compatibility to Raspberry Pi 4B 8GB. Only 32bit builds available."

I'd recommend returning and getting a rPi4 4GB instead.

Posted : 29/06/2020 4:12 pm
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