SKR Pro 1.2 pullup resistor question

[MohnJadden]

I had posted a while ago about the infamous issue where an endstop doesn’t trigger on an MPCNC built on the SKR Pro 1.2 board. I’ve come across a bunch of resistors and want to try the pullup resistor. Based on this thread, it looks like I can just solder the ends of the resistor to pins 1 and 3 for the endstop in question, but would it be possible for me to just stick the ends of the resistor into the pins of the cable I’m using? It’d be nice to not have to totally tear down the SKR and rewire it after a (hopefully successful) solder under the board.

[MakerJim]

@MohnJadden

but would it be possible for me to just stick the ends of the resistor into the pins of the cable I’m using?

We have threads that discuss this… for example this one:

Problem with x not stopping when homing

Below are photos of how to make a pigtail to solve the pullup problem without soldering to your board or do anything overly complex. Items required: 1.5k resistors HiTec Servo Terminal Kit Crimp Tool Heat Shrink Tube Process in photos: [pigtail1] I make the smallest little white wire possible so it can go into the connector and also be flexible so it can fold over in your case. I then solder the resistor wire (shortened of course) to the white wire. [pigtail2] [pigtail3] [pigtail4…

[Bartman]

@MohnJadden

solder the ends of the resistor to pins 1 and 3

If you go this route, do so on the underside of the board.

@MohnJadden

just stick the ends of the resistor into the pins of the cable

Just sticking them in would lead to a very poor connection, that would probably fall out over time. The better solution would be to crimp the resistor to sockets, and then using a connector housing to hold everything in place. This is what the “pigtail” method does, crimping the SIG wire and resistor together, with the other end of the resistor going to VCC. Then the SIG and GND wires go to another connector that attaches to the endstop cable connector.

[MohnJadden]

Thank you so much for this! That guide is exactly what the doctor ordered.

Is there some way it could be linked from the callout in the MPCNC docs about the SKR board? That’d make a lot of lives easier and probably less of a need to repeat the answer for folks like me.