3DPrinting
3DPrinting is a place where makers of all skill levels and walks of life can learn about and discuss 3D printing and development of 3D printed parts and devices.
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I just didn't want you to get no answer at all. It doesn't matter, but any sensor would need to be 4 wires for I2C (Serial Data, Serial Clock, Power, and Ground). If it was SPI it would take 5 or 6 wires, (Serial Data In, Serial Data Out, Clock, [Chip Select], Power, Ground).
It is true that there are some one wire serial protocols for a few peripheral devices but these are not super common and the main ones I am aware of are a temperature sensor, and I think I have a memory chip in my drawers somewhere. I've actually used the temp sensor in projects a half dozen times.
Anyways, many sensor modules on printers have both pull up and pull down configurations on the board or they will have a LED, or some other reason to include the extra wire.
Typically, the interrupt signal for end stops and runout sensors is configured to be triggered on low signal, but it is just a single flag in a register to make it trigger on high signal too. It just depends on the hardware used and total configuration stuff. Pull up resistors and triggering the interrupt on low is the most likely configuration. GL