Geeetech gt2560revB Board data

[tjm3d_auto]

Hello.

I'd like to make some modifications to my MeCreator 2 and it would be nice to have some more data on the gt2560revB board regarding all of the pin information and input/output specs. I'd like not to have to disect the board to measure everything. My goal is to add a 3D touch sensor and/or be able to replace the revB with a more common and more documentedcontrol board setup.

Can we get that data for revB?

[William]

3D Touch sounds good.

[Mahai]

Hi William,

I want to second that.
I want to do some modifications on my MeCreator2 as well.
I want to replace the stepper drivers with TMC2130 (not TMC2100).
For that, I need to know where the hardware SPI interface of the board is located.
And I need some unused pins for "cs".

Please help.

Regards, Martin

[William]

Here is the definition of A4988,you can refer to it.
https://www.pololu.com/product/1182

You can also upload the Marlin 1.1.8 firmware and you can find TMC2130 in the configuration.adv definition

[OctavioMaia]

Did you find out the pins?
I'm also interested in the TMC2130

[Mahai]

Hi William,

sorry to say that, but the technical support from Geeetech is really not good.
For a couple of weeks, I try to get some technical documentation for the GT2560revB board,
with no success.
I thought about buying other Geeetech printers/products, but I will not. Support is not good.
Last chance to answer simple questions. Please try to understand the issue and talk to some board engineers to get proper answers.

Environment:
MeCreator2 with GT2560revB board.

Goal:
Replace the "not so good" stock stepper driver with TMC2130 (not TMC2100).
Make use of all the advanced functions of TMC2130 with marlin 1.1.8

Issue:
I am familiar with marlin 1.1.8. and with all the settings in configuration.h and configuration_adv.h
No problem to setup TMS2130 in marlin.
And I am familiar with TMC2130 (there is a lot of technical documentation available).
The problem is the missing technical documentation of the Geeetech board !!!
To get the TMC2130 up and running, you need to connect some pins of the TMC2130 to specific pins on the board.
That are: hardware SPI, SC (ship select) and cl (clock)
So please answer this questions:
1. Where to find the hardware SPI pin on the GT2560 rev B. board?
2. Where to find two unused pin on the board to connect SC (ship select) and cl (clock). What are the pin numbers?

Additional questions:
1. Are the hot-end fan and the nozzle fan driven by MOSFETs? How many amps can I get out of the fan pins? (I want to upgrade the fans)

Regards, Martin

[William]

Here is important info
A4988's main working pin
En: Enable
Dir: Direction
step: pulse
I don't know what is the SC?Is stealthChop?
GT2560VB --There are no pins such as AUX2 or AUX3（Ramps）

[Mahai]

Hi William,

again. Please just try to answer my questions. I guess, you have to ask someone, how designed the board or someone who is familiar with arduino or the ATMEGA2560 chip.
Simple question:
1. Where can I find the hardware SPI pin on the GT2560 rev B. board?

Regards, Martin

[Yellowtick]

I got a feeling the marlinfw github crew that worked out the pin layout in boards_gt2560.h
has more knowledge about the pin layout of this board. (I'll try my luck there as well)

all that people want to know is which arduino pin number comes out where on the GT2560 board.
So please talk to the R and D department about schematics of the board.
then all magic will be done by community. :-)
I'll also put some time in reverse engineering the board as far as I can but I am by no means an expert.

All I currently know is that we need to sacrifice the SDcard connector.
there the MOSI clock and data pins should be fairly simple to find. (probably easiest to start with the type of SD card module and then track back pin layout to the connector to find the corresponding pins on the GT2560.

then the only thing left is two pins for CS (Chip Select) to enable the firmware to talk to the individual stepper drivers on command.
My hope is that X_max and Y_Max can be used

Thanks

[zeradin]

hello, what he means is what are the pin numbers for all the none used pins on a stock setup of the board.
marlin has software spi mode with which we just need to specify the pins that are going to emulate chipselect pin mosi pins etc
if you gave us those pin designations on the board (such as the spare tx rx serial pins just below x stepper socket) then the community will be able to work up a guide for how to install tmc2130 with full functionality (without ruining the drivers with poor diy mod soldering)

so what are the pin numbers?