Duet 2 WiFi on Ender 3 keep LCD

alexic

Hello, I saw that it's possible with the Duet Maestro to keep the originak LCD panel and controls from the Ender 3 printer. I would like to do the same with my Duet 2 WiFi board.
Could I manually adapt the hardware pins with a connector and then activate the LCD support from software? How can I find out what pins do I need.

Thanks for your help!

jay_s_uk

what type of LCD is it?
can you provide photos of the back?

A Former User

afaik exp1 and exp2 follow the reprap pinout but i havent tried , also the display controller has to be identified to check compatability with duet2wifi that support 12864 LCD as of 3.2beta1

edit: looks to be st7920 and not the supported (in progress) st7567

Veti

you will need extra hardware.

see https://forum.duet3d.com/topic/15611/logic-level-shifter-for-12864-display-on-duet-2-wifi

A Former User

@Veti said in Duet 2 WiFi on Ender 3 keep LCD:

you will need extra hardware.

see https://forum.duet3d.com/topic/15611/logic-level-shifter-for-12864-display-on-duet-2-wifi

that thread starts off targeting st7920 and ends up with dc42 adding support for st7567 - so while the board shared there will work with the patch for rrf2 it will not work without adittional changes to board and firmware for rrf3

Veti

the duet wifi by default does not have a head for 12864 lcd screens.

A Former User

afaik the reason to support st7567 instead of st7920 was it required no adittional hardware and could use the conn_lcd and con_sd headers directly with a (custom cable possibly)

in any case the ender 3 lcd will need hardware and patched firmware.

Veti

from https://forum.duet3d.com/topic/6449/making-the-lcd-12864-work-on-the-duetwifi-please-advise/3

To support a 12864 you would need to pick up the SCLK, MOSI and one of the CS signals from the temperature daughter board connector or the expansion bus, gate the SCLK signal with CS and level shift it to 5V, and also level shift CS and MOSI to 5V.

i do consider a level shifter additional hardware.

A Former User

@Veti said in Duet 2 WiFi on Ender 3 keep LCD:

i do consider a level shifter additional hardware.

for st7920 that isn't supported by 3.2; but not for st7567 that is supported by 3.2 (or so afaik at least)

stuartofmt

FWIW - I recently went through the same considerations for my Ender 5 (same-same).
In the end - I decided it was not worth the effort.
Since I had a spare Pi with touch screen lying around I did four things:

Pi with Debian and simply used the browser to get at the Duet Web page. This gives all the control (and much more) than the ender control panel.
Used the same Pi with a Pi camera and installed motion.
Port forwarded from my router to the Pi with a DNS url (not the most secure will replace with VPN)
Mounted the Pi on the printer frame.

This gives me both local and remote (smartphone etc.) control and monitoring. I'm very happy with the arrangement.

Of course there is some expense if you do not have the parts lying around but the alternative is a lot of time and some expense.

jay_s_uk

https://github.com/airbrett/DisplayRRF/
Have a look at this.
Uses an Arduino mini pro to connect a 12864 display to RRF

A Former User

interesting find! A PanelDue to 12864 bridge might be easier than trying to put the st9720 support back in rrf3

jay_s_uk

Its something one of the users of the LPC port has been working on.

mitch

I went through the same discovery using duet wifi + ender 5. Ultimately a low cost clone Paneldue was the easiest solution and it offered a very rich user experience. Thingaverse has lots of great enclosure and mount options. I am happy I went that route.

However, once the plugins start rolling in with rrf3 I am curious how much the PanelDue will be able to keep up with respect to the UI for the new features or if a true browser based tablet display will be more robust.

Phaedrux

@mitch said in Duet 2 WiFi on Ender 3 keep LCD:

I am curious how much the PanelDue will be able to keep up

IMO it's two different approaches. At the printer I'm more likely to want a stripped down UI with direct printer controls. Large touch points and easy to navigate. Macros are there for complexity.

I've been dissatisfied using a pi and DWC on a small touch screen.

alexic

@jay_s_uk This seems interesting! I'll give it a look and try to replicate the project.

Swift Tester

Sorry for crossposting, actual info for Duet2 + Ender 3 LCD here: https://forum.duet3d.com/post/207704