I know this is covered other places, believe me, I've been reading for hours, but I guess i'm just dumb.
I need to control dimming on 3 led drivers. 2 Mean Well ELN-60-27P and 1 Mean Well ELN-60-48P (DATASHEET: http://www.meanwell.com/search/eln-60/default.htm) I want to use the fewest components possible, of course. I have an Arduino UNO R2.
The thread that I understand best is this one(Arduino Forum) from a few years ago, but I didn't wanna raise the dead to ask questions there. Post #8 has a diagram that I think I understand, and I could use that, but I think there's a better solution further down.
So, for starters, on post 8; how do I figure out what resistors to use?
How do I figure out which pins on the NPN go to which places? (Really, I think that's shown, I really could also use a good resource on the meaning of the symbols)
Further down, the ULN2801/2/3/4/5, ULN2001/2/3/4 chips are recommended. I've been looking at their spec sheets, but that's not helping me figure out how to wire them. Can anyone give me some insight, or point me in the right direction? (Also, just for now, can someone tell me which ones to buy? I want to order them ASAP, even though I dono what they even are yet)
I think i'll build and test the first solution, and once that's working, also build and test the second solution. I have a bit of time before I'm ready to cough up the $300 for the other parts of the build. (Which is REALLY cheap, by the way, looking through old threads, people were spending $2000 doing the same thing I'm doing now only a few years ago... I'm sidetracking...) If I power the Arduino with a 10v, does that 10v come out of the board somewhere (Vin?)? If I can't find a good 10v supply (seems they're hard to come across) and i need to use 12v, how would I work that out? I guess I really don't know how to power this, and I could ask a billion questions right here, but I'm sure one of you geniuses just knows the answer.
I know this is a lot for my first post, but I'd be really thankful for some help. I've been having a ton of fun messing with this board ofr the past few days, it's so easy to use, and there's so much documentation. Thanks a ton!