Breathing LED controlled by temperature sensor (NEED HELP!!)

[system]

kovil:
Sorry, but why x/17?
It doesn't work

Because from my experience of it, only values of x less than 15 give a good result, higher values are too fast.
So the range, I believe, should be limited to 0 to 15 not 0 to 255.
255 / 17 = 15
If you can reconfigure the map expression for that -- then by all means.
It was easier for me to divide that by 17, cheap and easy.

Does my demo sketch in Reply #9 effect a fade in/out somewhat as you expect?
It won't change, it just stays at that one "speed", but it verifies the fading aspect anyway.
Doesn't even that much "work"? [I think it does here - I can *youtube* evidence of that if necessary.]

And I don't know from your "wave", let's see your "transistor circuit", please.

I guess I am being unreasonable.

Yeah, I know the fade works if there is no x, I wrote the function, and x is mapped to 1, 5. Whats the point of /17?
The problem is the change of the x resulted in random data in the output val.
BTW, I switch the transistor to a single led connected to 5v output, the result is the same.