That is good news. I didn't want to hack in a bunch of resistors.
I'm going to drive the PI side with 3.3vdc from a buck transformer. The input side is going to be mixing a bunch of voltages (all DC) from 5 volts (microswitch) to 24 volts (the motion sensor requires 24vdc) Since each 'lane' is isolated I can make mix it up a little.
PS - Once this is all done I'll make a big post about my project to share with everyone including my code... I think you all will find it cool.