can we use an input /output card via usb on our pc's with scratch

If it's Arduino-based you can use this code: https://github.com/MrYsLab/S2A

And if you want to use Scratch 1.4 there is my beta ScA Your text to link here…and there is also S4A Your text to link here…which is the easiest to use in terms of least setup steps needed but as its a modification of Scratch then its a not 100% Scratch.

There quite a few other ones as well so lots of choice

Simon