The guide below describes how to connect a Raspberry Pi 4B to the Prusa i3 MK3s main board (Einsy RAMBo) board with its builtin RPi headers and an additional step-down / buck converter. The buck converter is necessary, since the Einsy headers do not provide enough amps to power anything bigger than a Raspberry Pi Zero W.
| Raspberry Pi | Einsy RAMBo | Step-down |
|---|---|---|
4 |
+ |
|
6 |
- |
|
8 |
6 |
|
10 |
8 |
|
15 |
13 |
|
16 |
14 |
vi /boot/config.txt...
[all]
enable_uart=1
dtoverlay=disable-bt
To avoid interference, disable the hciuart systemd service:
sudo systemctl disable hciuartTo ensure OctoPrint uses the newly added /dev/ttyAMA0 serial port, go to its settings, navigate to "Serial Connection" → "General" → "Connection" and set "Additional serial ports" to /dev/ttyAMA*.
What a wonderful recourses thank you so much for sharing
for others in search of knowledge
I ended up needing to do a couple more steps outlined in this guide
https://zaribo.com/blog/raspberry-pi-3-einsy-rambo-rpi-gpio-connection-tutorial/
Now you should enable the RPI port through LCD Menu. Go to Settings/RPi Port on.
Login to Raspberry Pi through SSH.
sudo nano /boot/config.txt
and hit enter. Go to the end of the page and write the text below.
enable_uart=1
dtoverlay=pi3-disable-bt
Press Ctrl + X and press Y and save.
Now we have to enable serial port through configuration. Write
sudo raspi-config
and hit enter. Select 3.Interfacing Options and hit enter.
Then select P6 for Serial Port settings
Answer the questions as follows:
“Would you like a login shell to be accessible over Serial?” Hit no.
“Would you like the serial port hardware to be enabled?” Hit yes.
Hit Finish and it will ask you if you would like to reboot. Hit yes and you can close the Terminal/Putty window now.
Now lastly we are going to add the port on Octoprint interface. Open the Octoprint interface and go to Octoprint Settings/Serial Connection/General
Enter dev/ttyAMA0 into Additional serial ports section.