I want to add a 7 segment clock to show the ete time

Every time it's hard for me to look at the estimated time of a print on laptop and I don't have a full graphic display so how can I do this? Thank u

get the 7 segment working on an arduino and talking serial to the laptop.

then you have to modify your control software to send the time to the 7 segment display

Edited 1 time(s). Last edit at 09/11/2018 12:37AM by Dust.

Can I just do it through marlin

not directly...

1) Im fairly sure marlin doesnt know anything about the eta time... only the control program knows about that
2) each segment of a 7 segment display uses an Io line... so presuming you want at least 24 hours, thats HHMM 4*7 = 28 I/O pins ... add another 7 if you want a days digit. there are not that many spare IO pins on most controllers. So you need some sort of display controller. that talks serial or i2c, SPI or some other protocol.
3) marlin has a lot better things to do with its time, like keeping all the steppers running smoothly, you dont want to bog it down with unneeded stuff. It results in uneven movement and crappy prints .
4) marlin is a very complex bit of code... modifying it extensively is problematic for most of us.

Thank you and Marlin is already doing it.i.e showing ete over printer's lcd from host is there a way for me to ignore the lcd and send it to the 7 segment display

Just ran latest marlin 1.1.9 on ramps with 2004 lcd

there is no ETA on any screen that I can find.

You have to enable eta or eye over ur host for that

I've posted it over reptier forums and they sent me this

They are cheating the client host software is sending the ETA to the printer LCD to display

The firmware doesnt know the ETA/ETE at all

Edited 1 time(s). Last edit at 09/11/2018 07:26AM by Dust.

M117 displays any text they want on the lcd screen

the host is the thing working out the ETA/ETE and just sending it to the lcd,

You could send the printer the gcode "M117 I Am a FISH" and it will display it.

Now that we know this the firmware mod is now quite easy... if text in M117 starts with ETA grab numbers and do something with it. (send it to hardware)

As for hardware....
you may want to look at [osoyoo.com]

Edited 2 time(s). Last edit at 09/11/2018 07:42AM by Dust.

Thank u so much dust