Hi, thanks for the awesome guide ! I'm all set on the parts and since i'm going to be running this on a C6H, a corsair 570X case and 6xSP120 fans there isn't any changes to make it work on my end.
However, even though i believe i have a decent understanding of we're doing here but i didn't quite get your voltage divider from 12V to 5V. Refering to my drawing, you put 2.8k (a 2.7k and a 100) in R1 and a 1k in R2 ? By my count that would give a little over 3V max output voltage. Or perhaps you put 2x 1k in R2 which would give us exactly 5V ? Or perhaps you did your divider a way i don't know about ?
Thanks.