Thanks Hood.
I won't be at home for the next couple of days, but when I get back, I will take this BOB to the lab and test and try everything we were talking about. I might even be able to post the schematics, as I guess other people with the same device could find it useful. I have 4 or 5 of those, so for me it definitely makes sense learning a bit more about it...
I understand the advantage of the higher voltages, still, looking at the configuration of inputs, I find it a bit odd having to attach an extra power supply in order to, for example, connect the limit switch.
I'll try to change the resistors so everything will work with 5V only.
Miso