JohannesTN:
As I described I was playing around with the constant current driver circuit found at Pcbheaven here:
Constant current driver
Why?
Just - why?
Either you muck about trying to comprehend multiple random sources, or you get serious and believe us. If you don't want to, well, don't post to this forum!
JohannesTN:
And then, on this page the guide says that
Found in the bottom of the page: PWMI believe I did it right following the guide at PCB heaven, but as far as I can tell from your comment, it isn't right at all. I would like to know what to do then.
Except that you didn't actually read it, because it says
Remember that the PWM controller i use sinks current and does NOT source. The base of the transistor grounds on every pulse of the generator, thus the transistor turns off completely, turning off the LED as well.
This has nothing to do with an Arduino,