reprapdiscount LCD display

Completely different communication method. I believe the LCD's use a serial transmission which is much more vulnerable to the things Steve described.

I, unfortunately, don't know enough to properly describe why it works differently. But they're just two very different means of accomplishing signal transmission.

 

Huh well i just placed and order for an xxl hopefully someone will figure it out.

 

In reply to the network cable photo, the difference is impedance terminated pairs of drivers and receivers which are designed for exactly for that cable's configuration and length. Those cables weren't just thrown together. Someone spent a lot of time designing and simulating the entire PCB/cable/IC system. Trust me on this. Again, you can try whatever scheme but it would be bad to drop some bits in the middle of a long print. I think the best be would be to separate out the SD card signals and take care of them properly.

 

@collin
Just don't order those cables from the link I provided earlier. Don't want you to spend so much money and find out it doesn't work.

 

dont worry i didnt ha ha

 

thats so interesting im a mech eng. and that is all gibberish to me. If anyone figures this out id kiss em on the face.

p.s. can you have the controller and the computer hooked up at the same time?

 

Good. Now it's hunting game for the post with the extra length cable for the LCD display.

 

Another idea is to cut out the SD card signals close the the RAMPS board and rig up another SD card slot there like the one that now comes with the printer. Then extend the LCD and rotary encoder lines to wherever they seem to work. This would be some work but possible.

 

i wouldn't be apposed to it, combined with this.

http://www.ebay.com/itm/like/111222723359?lpid=82

 

I'm and EE and if you look hard enough you can find mechanical analogs for all of this .

Yes the they work fine together but you have to be a bit careful not to try doing something from both at the same time. For instance don't give it a command from Repetier or MatterControl and then do something else with the LCD before it finishes. I have not hooked the PC to my printer in months other than to upgrade the firmware. The XXL does everything I need.

 

Ya that sounds fantastic i hate being tethered to my printer when doing homework (still in school) and until l recently my prints weren't consistent enough to be sd card operated ya know. but know with auto bed leveling im in good shape. ANYWAYS im going to give it the old college try on this one. i want ot moutn it on the back side of my printer right where you have it but on the back. you think itll fit?

 

That looks good. It will be some work to figure out the pinout but you could definitely do it. Notice that that cable is only 18 inches long. It's too bad that the RAMPS SD card connector also has the rotary encoder knob's signals on it too. You need to tease them apart.

Note that on the XXL schematic I posted above pin 5 is indeed a ground pin. You will also need these:

http://reprap.org/mediawiki/images/f/f6/RAMPS1.4schematic.png
http://reprap.org/mediawiki/images/c/ca/Arduinomega1-4connectors.png

 

No such thing! thanks for the detail

 

thanks matt

 

Ziggy, Collin wanted to run over 90cm. I wonder how slow the gcode can be transmitted before the print starts to degrade?

 

Looking at the Marlin baud rates it looks like you can slow down the SD data rate quite a bit before problems crop up. The default is USB data rate is 250k baud. Collin - you would need to modify the firmware for this.