Fading brightness of NeoPixel over duration

Other Hardware LEDs and Multiplexing
1

I'd like to fade the brightness of a strip of NeoPixels over a specific period of time and am struggling with coming up the algorithm to do this myself.

Does anyone know of a good way to fade from one brightness level to another over a specified duration?

2

Divide the specific duration into say 100 steps. Then divide the start and end brightness into 100 steps.

Then after each step time has elapsed change the brightness by a step.

Use the blink without delay if you want to do other things as well.