I'm building a RAMPS-based XY plotter and have had good success, but I need help consolidating my wiring to add limit switches. I think I have "almost" a good idea for implementing limit switches and 2 servos.
Using Cat5 cable (8 wires, 22 gage) I need one more wire... tell me if this might work or if I'm just going to have to find a 9th wire:
1) X- (Using NC 2-wire limit switches for #1 - #4)
2) X+
3) Y-
4) Y+
5) Servo 1 Signal (D11)
6) Servo 2 Signal (D6)
7) Servo ground - I have added a 5VDC supply at GND & VCC pins just left of reset switch per other RAMPS servo references.
8) Servo +5Volts - VCC
So the 9th wire I need would be the limit switch ground. Is it possible that the servo wire ground (#7 above) is shared/shareable with the limit switch ground?
I see the 2 sided PCB image elsewhere on this forum, and it looks to me like the limit switch negative trace is tied to the board's ground, but I'm not sure -- and I have smoked two Arduinos lately! It's quite possible I have a short elsewhere in my pinout wiring, but at this point, I thought it would be good to back up and question my assumptions. Voltmeter shows pretty low resistance ( a few ohms)... I'd appreciate the wisdom of others who may have gone before me.