DC current. The V+ connects to one side of a load, that is called high side. The GND connects to the other side of the said load, that is called low side. In mosfet the gate voltage determines a current flowing from drain to source. So for low side switch, top side with V+ goes to load top, and low side with load goes to drain, the gate goes to uC, and source goes to ground.
Reprap is open source community. It is called like that because the source files are available for download. If i am not mistaking your board is made from some guy who copied from other open source electronics and released its variant as closed source, that means the source files for that board are not available. I am against that and i think that it takes a special kind of ppls to do stuff like this. Source files are *extremelly* important when you want to do any mods. With source files for example, you highlight a net, and shows all of it, you know which path it goes, where its easiest to hack etc. Its also much easier to get help from others if anything goes wrong or if you want to expand is functions etc.
So if you get in a domain that is open source, then buy that: electronics which give a link to source files. Without source files: *dont* buy, no matter how cheap it is or how good the marketing was, and no matter how much the guys was bragging about himself, and no matter how shiny the top lid is. So imho best thing to do from now on - stick with open source, if you want to learn, understand or hack things.
Reprap is open source community. It is called like that because the source files are available for download. If i am not mistaking your board is made from some guy who copied from other open source electronics and released its variant as closed source, that means the source files for that board are not available. I am against that and i think that it takes a special kind of ppls to do stuff like this. Source files are *extremelly* important when you want to do any mods. With source files for example, you highlight a net, and shows all of it, you know which path it goes, where its easiest to hack etc. Its also much easier to get help from others if anything goes wrong or if you want to expand is functions etc.
So if you get in a domain that is open source, then buy that: electronics which give a link to source files. Without source files: *dont* buy, no matter how cheap it is or how good the marketing was, and no matter how much the guys was bragging about himself, and no matter how shiny the top lid is. So imho best thing to do from now on - stick with open source, if you want to learn, understand or hack things.