Quote Originally Posted by Jester View Post
Ok this is going to sound dumb but what does optoisolation do? lol sorry but im very new to this. I will probably be connecting microswitches as home switches, although i have some prox sensors i think in the garage which need 8v according to the packing .

Just think of it like this...

If you have a major malfunction and 240v gets sent to your parallel port, it will probably fry the port and motherboard. Opto-isolation helps to prevent that.

Having said that, I have been running my home/limit switches without isolation on the Tonsen BOB for the last 6 months without issues. I have however just built the opto-isolated addon board to hook up to the Tonsen BOB, I just haven't had time to test it properly. Now that the Christmas malarkey is out of the way, perhaps I can get to test it.

Regards,

Les