Of course, just like most things in electronics, there are usually several completely "valid" ways of doing things, which one happens to be the easiest or "best" in a given situation depends on a number of factors and variables depending on the precise situation.
Yes, I'm surprised there hasn't been a microcontroller solution presented...
Lol, yeah... One of a plethora of options...
These days it seems to always be "of course, you could just use a Paduk or something too!"
(Why these days people seem to always insist on using a microcontroller when a couple diodes, or maybe a couple diodes and a transistor or two and a couple of resistors would almost certainly suffice, I don't know.)
I guess I'm just "
old school". Arrrrr.... Back in
my day, we had to walk two miles, barefoot, in the snow, uphill
both ways to get to the Electron Hut to buy our diodes.... Arrrrr.... They came in these little metal or glass dome bubbles labelled things like 6H6.... Arrrrr....
In general, it's a bad idea to use a signal to drive a load, even a small one, if there is no documentation or way to determine the signal's sink/source capability.
Indeed. Without knowing what is driving those signals, and what
else might be connected to them in the "other" device, it's best to use them just as signals, not even driving something "small" like an LED... That's why I'm surprised the OP doesn't seem to have any idea what is actually at the other end.