NEWBIE WARNING: THIS IS PROBABLY REALLY SIMPLE AND OBVIOUS, BUT I AM STILL A BEGINNER AND DONT KNOW WHAT TO DO
I can't seem to find an IC that will do this. I have found stuff on open collectors and low side switching, but I don't fully understand what these are so I am not sure if they are what I am looking for.
Basically, I have a button that when pressed connects to ground on a seperate IC (specifically the PIC18LF2550). This GND signal is registered as a pushed button, and an action is performed. I wish to emulate this button with the arduino, but when I use the GND on the arduino, the IC does not register the input as GND and does not perform the desired action. Also, the way I am using the PIC requires that I do this weird ground switching thing, so there is no designing a whole simpler solution (if I could do that, this wouldn't be so hard).
So what I am looking for is an IC that I can provide a relative GND to from the PIC18LF2550 and will output GND signals for every high input I give it. I don't care what it does with other inputs. I just want it to take high inputs and take them to the PIC's GND. Something like this, where the green is high, black is low, and red/pink is GND relative to the PIC.
(sorry for the crappy picture)
Any help would be greatly appreciated =)